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JP3636271B2 - Topical skin preparation - Google Patents
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JP3636271B2 - Topical skin preparation - Google Patents

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JP3636271B2
JP3636271B2 JP34226597A JP34226597A JP3636271B2 JP 3636271 B2 JP3636271 B2 JP 3636271B2 JP 34226597 A JP34226597 A JP 34226597A JP 34226597 A JP34226597 A JP 34226597A JP 3636271 B2 JP3636271 B2 JP 3636271B2
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skin
acid
hydroxy
external preparation
action
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JPH11158055A (en
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省一 上野
康博 山田
増美 竹井
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Noevir Co Ltd
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Noevir Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、保湿作用,角化正常化作用及び真皮線維芽細胞活性化作用が相乗的に増強され且つ持続的であり、有効な皮膚の老化症状の改善,防止作用、肌荒れ改善作用及び美肌作用を有し、さらに低刺激性を示す皮膚外用剤に関する。さらに詳しくは、2-ヒドロキシ脂肪酸の1種又は2種以上、水酸化アルカリ溶液を作用させて異性化させた糖の混合物、キトサン及びその誘導体より選択される1種又は2種以上、及びアミノ酸及びその誘導体の1種又は2種以上を含有して成る皮膚外用剤に関する。
【0002】
【従来の技術】
2-ヒドロキシ脂肪酸が、皮膚の角化異常の改善に対し優れた効果を有し、また真皮線維芽細胞を活性化して皮膚のしわ,しみ等の老化症状を改善し得ることがユージーン・ジェイ・ヴァン・スコット氏らにより報告され(Cutis 43 (3) 222-228 (1989),特開平5−139947号公報等)、それらを含有する化粧料等皮膚外用剤も上市されている。
【0003】
しかしながら、皮膚のしわやしみ等の老化症状を短期間で有効に改善しようとすると、2-ヒドロキシ脂肪酸をかなり多量に配合する必要があり、皮膚刺激性の発現が問題となっていた。また、2-ヒドロキシ脂肪酸の作用が一過性であることから、有効な作用を得るには1日に何度も皮膚に適用する必要があり、煩雑であるばかりか皮膚刺激反応を増悪する結果となっていた。
【0004】
【発明が解決しようとする課題】
そこで本発明においては、2-ヒドロキシ脂肪酸の含有量をできるだけ低減するとともに、その皮膚刺激性を緩和し、且つ保湿作用,角化正常化作用及び真皮線維芽細胞活性化作用が相乗的に増強され且つ持続的であり、有効な皮膚の老化症状の改善,防止作用、肌荒れ改善作用及び美肌作用を有する皮膚外用剤を得ることを目的とした。
【0005】
【課題を解決するための手段】
上記の課題を解決するため種々検討した結果、本発明者らは、水酸化アルカリ溶液を作用させて異性化させた糖の混合物と、キトサンやその誘導体及びアミノ酸やその誘導体を、2-ヒドロキシ脂肪酸と併用して含有させることにより、保湿作用,角化正常化作用及び真皮線維芽細胞活性化作用が相乗的に向上且つ持続し、有効な効果を得るのに必要な2-ヒドロキシ脂肪酸の配合量を大幅に低減することができ、さらに予測を超える肌荒れ改善作用及び美肌作用が得られることを見いだし、本発明を完成するに至った。
【0006】
すなわち本発明は、2-ヒドロキシ脂肪酸の1種又は2種以上、水酸化アルカリ溶液を作用させて異性化させた糖の混合物、キトサン及びその誘導体より選択される1種又は2種以上、及びアミノ酸及びその誘導体の1種又は2種以上を皮膚外用剤基剤に含有させて成る。
【0007】
【作用】
本発明において、各構成成分の併用により得られる線維芽細胞の相乗的且つ持続的な活性化作用と、角質除去作用の相乗的向上について、以下に示す。
【0008】
まずヒト由来線維芽細胞を、1ウェル当たり2.0×104個となるように96穴マイクロプレートに播種し、24時間後に表1に示す各試料を、同表中に示す最終濃度となるように添加した1.0容量%の牛胎仔血清を含有するダルベッコ修正基礎栄養培地(DMEM)にて、37℃で培養した。培養開始後0.5,1,2及び4時間後に2-(4,5-ジメチル-2-チアゾリル)-3,5-ジフェニルテトラゾリウムブロミド(MTT)を20μg/ml含有するDMEMに交換して37℃で2時間培養し、テトラゾリウム環の開環により生じるフォルマザンを560nmにおける吸光度により測定した。なお、1.0容量%牛胎仔血清添加DMEMのみで培養した系を対照とし、5.0容量%牛胎仔血清添加DMEMで培養した系を陽性対照とした。結果は、対照における吸光度を100.0として表した活性化指数と、各試料を含む培地中での培養時間との関係により、図1に示した。なお表1中の異性化糖混合物は、後述する製造例に係るものであり、その組成は表2に示す通りである。
【表1】

Figure 0003636271
【表2】
Figure 0003636271
【0009】
図1において、2-ヒドロキシ酢酸のみを含有する試料1を添加した場合(1)には、活性化指数は培養2時間後で最大(275.4)となり、それ以降は減少していた。2-ヒドロキシ酢酸と異性化糖混合物を含む試料2を添加した場合(2)にも、やはり活性化指数は培養2時間後に最大となっていたが、活性化指数は336.3と線維芽細胞活性化作用の増強が認められた。一方、2-ヒドロキシ酢酸,異性化糖混合物,キトサン及びグリシンを含有する試料3を添加した場合(3)には、活性化指数は427.8に達し、培養4時間後においても低下することなく高く維持されていた。すなわち、本発明の必須成分である2-ヒドロキシ脂肪酸,異性化糖混合物,キトサン及びアミノ酸を含有する場合、線維芽細胞の活性化が相乗的に増強され、且つ持続性となることが示された。なお陽性対照(4)についても、活性化指数は培養2時間後に最大(157.5)となった。
【0010】
次いで、表3に示す成分を含有する水溶液を試料として角質除去作用を評価した。評価は、角質増殖症を呈する患者10名を1群とし、各群に表3の各試料液をブラインドにて1日2回、0.5mlずつ手甲部に1週間使用させ、使用開始前及び使用終了後の角質層の状態を、テープストリッピングして採取した標本について顕微鏡観察により比較して行った。角質層の状態は多重剥離度により評価し、表4に示す判定基準に従って点数化し、10名の平均値を求めて表5に示した。
【表3】
Figure 0003636271
【表4】
Figure 0003636271
【0011】
【表5】
Figure 0003636271
表5より明らかなように、本発明の必須成分である2-ヒドロキシ酢酸,異性化糖混合物,キトサン及びグリシンを含有する試料8塗布群では、使用後の角質の多重剥離度は顕著に改善されており、過剰な角質増殖により剥離せずに蓄積された角質が良好に除去されることが示された。これに対し、2-ヒドロキシ酢酸を単独で含有する試料1と、2-ヒドロキシ酢酸と異性化糖混合物,キトサン及びグリシンのそれぞれとを含有する試料5〜試料7使用群では、角質多重剥離度の改善は認められたが、その程度は試料8使用群に比べて低く、また異性化糖混合物,キトサン及びグリシンを各単独で含有する試料2〜試料4使用群では、有意な角質多重剥離度の改善は認められなかった。
【0012】
【発明の実施の形態】
本発明において2-ヒドロキシ脂肪酸としては、炭素数2〜10のものが好ましく使用できる。たとえば、2-ヒドロキシ酢酸(グリコール酸),2-ヒドロキシプロピオン酸(乳酸),2-ヒドロキシブタン酸(2-ヒドロキシ酪酸),2-ヒドロキシペンタン酸(2-ヒドロキシ吉草酸),2-ヒドロキシヘキサン酸(2-ヒドロキシカプロン酸),2-ヒドロキシヘプタン酸(2-ヒドロキシエナント酸),2-ヒドロキシオクタン酸(2-ヒドロキシカプリル酸),2-ヒドロキシノナン酸(2-ヒドロキシペラルゴン酸),2-ヒドロキシデカン酸(2-ヒドロキシカプリン酸)といった2位に水酸基を有する直鎖飽和脂肪酸、2-ヒドロキシプロペン酸(2-ヒドロキシアクリル酸),2-ヒドロキシ-trans-2-ブテン酸(2-ヒドロキシクロトン酸),2-ヒドロキシ-cis-2-ブテン酸(2-ヒドロキシイソクロトン酸),2-ヒドロキシ-2-ヘキセン酸,2-ヒドロキシ-3-ヘキセン酸,2-ヒドロキシ-4-ヘキセン酸,2-ヒドロキシ-5-ヘキセン酸,2-ヒドロキシ-2-ヘプテン酸,2-ヒドロキシ-3-ヘプテン酸,2-ヒドロキシ-5-ヘプテン酸,2-ヒドロキシ-6-ヘプテン酸,2-ヒドロキシ-cis-2-オクテン酸,2-ヒドロキシ-trans-2-オクテン酸,2-ヒドロキシ-3-オクテン酸,2-ヒドロキシ-cis-2-ノネン酸,2-ヒドロキシ-trans-2-ノネン酸,2-ヒドロキシ-3-ノネン酸,2-ヒドロキシ-2-デセン酸,2-ヒドロキシ-4-デセン酸,2-ヒドロキシ-9-デセン酸等の2位に水酸基を有する直鎖モノエン酸、2-ヒドロキシ-2,4-ヘキサジエン酸(2-ヒドロキシソルビン酸)等の2位に水酸基を有するジエン酸、2-ヒドロキシ-3-メチルブタン酸(2-ヒドロキシイソ吉草酸),2-ヒドロキシ-2-エチルブタン酸,2-ヒドロキシ-2-メチルペンタン酸,2-ヒドロキシ-4-メチルペンタン酸(2-ヒドロキシイソカプロン酸),2-ヒドロキシ-2-エチルヘキサン酸,2-ヒドロキシ-7-メチルオクタン酸(2-ヒドロキシイソノナン酸)等の2位に水酸基を有する分岐鎖脂肪酸、酒石酸,リンゴ酸等の2位に水酸基を有するジカルボン酸、クエン酸等の2位に水酸基を有するトリカルボン酸などが挙げられ、これらより1種又は2種以上を選択して用いる。皮膚外用剤中における含有量としては、製剤安定性,バイオアベイラビリティ等を考慮すると、0.01〜5.0重量%程度が適切である。
【0013】
本発明における第二の必須成分である、水酸化アルカリ溶液を作用させて異性化させた糖の混合物は、水酸化ナトリウム,水酸化カリウム等の水酸化アルカリ溶液により糖を異性化させて得た反応生成混合物であり、特にグルコース又はラクトースを異性化させたもの、或いはこれらの混合物が好ましく用いられる。これらは、特公昭48−1504において記載された方法等により製造することができる。皮膚外用剤中における含有量としては、製剤安定性,バイオアベイラビリティ等を考慮すると、0.01〜10.0重量%程度が適切である。
【0014】
本発明における第三の必須成分であるキトサン及びその誘導体としては、分子量10,000〜100,000程度のキトサン及び部分脱アセチル化キチン、N-トリメチル化キトサン等の4級化誘導体等が挙げられ、これらより1種又は2種以上を選択して用いる。皮膚外用剤中における含有量としては、製剤の物理的特性への影響等を考慮して、1.0×10-6〜1.0重量%程度が適切である。
【0015】
本発明における第四の必須成分であるアミノ酸及びその誘導体としては、グリシン,L-アラニン,L-バリン,L-ロイシン,L-イソロイシン等のモノアミノモノカルボン酸、L-アスパラギン酸,L-グルタミン酸等のモノアミノジカルボン酸(酸性アミノ酸)、L-リジン,L-アルギニン等のジアミノモノカルボン酸(塩基性アミノ酸)、L-セリン,L-スレオニン等の水酸基を有するアミノ酸、L-アスパラギン,L-グルタミン等のアミド基を有するアミノ酸、L-システイン,L-シスチン,L-メチオニン等の含硫アミノ酸、L-フェニルアラニン,L-チロシン等の芳香環を有するアミノ酸、L-ヒスチジン,L-トリプトファン,L-プロリン,L-オキシプロリン等の複素環を有するアミノ酸、グリシルグリシン,グシリルアラニン,アラニルアラニン等のジペプチド類、トリメチルグリシン等のメチル置換体などが挙げられ、これらより1種又は2種以上を選択して用いる。角化正常化作用や肌荒れ改善,美肌作用を向上させるには、グリシン,L-アラニン,L-セリン,L-スレオニン,L-アスパラギン酸,L-グルタミン酸,L-アルギニン,L-リジン,L-トリプトファン,L-プロリン,グリシルグリシン及びトリメチルグリシンが特に好ましく使用できる。これらアミノ酸及びその誘導体の皮膚外用剤中における含有量としては、製剤安定性,バイオアベイラビリティ等を考慮すると、0.01〜10.0重量%程度が適切である。
【0016】
本発明における上記各成分の含有量比としては、2-ヒドロキシ脂肪酸と水酸化アルカリ溶液を作用させて異性化させた糖の混合物とは、重量比にして1:10〜10:1、2-ヒドロキシ脂肪酸とキトサン及びその誘導体とは、重量比にして10,000:1〜1:100、2-ヒドロキシ脂肪酸とアミノ酸及びその誘導体とは、重量比にして1:100〜100:1の範囲とすることが好ましい。
【0017】
本発明に係る皮膚外用剤には、外用剤基剤に通常用いられる油脂類,ロウ類,炭化水素類,脂肪酸類,低級アルコール類,高級アルコール類,多価アルコール類,エステル類,界面活性剤,水溶性高分子化合物等を含有させることができる。さらに、他の皮膚細胞賦活剤,抗炎症剤,活性酸素種消去剤,美白剤,保湿剤,紫外線吸収剤,防腐防黴剤,香料等を含有させることができる。
【0018】
本発明に係る皮膚外用剤は、ローション剤,乳剤,ゲル剤,クリーム,軟膏等の剤型で提供することができる。また、化粧水,乳液,クリーム,美容液,マッサージ剤,パック剤等の皮膚用化粧料、メイクアップベースローション,メイクアップベースクリーム,液状又はクリーム状のファンデーション等のメイクアップ化粧料、ハンドクリーム,レッグクリーム,ボディローション等の身体用化粧料などとしても提供することができる。
【0019】
【実施例】
さらに本発明の特徴について、実施例により詳細に説明する。まず、以下の実施例において使用した水酸化アルカリ溶液を作用させて異性化させた糖の混合物の製造例を次に示す。
【0020】
D-グルコース1kgを精製水2,000mlに溶解し、攪拌しながら10(w/v)%水酸化ナトリウム溶液10mlを添加し、21〜23℃で密封静置する。その後、常にpH9以上を保つように10(w/v)%水酸化ナトリウム溶液10mlずつを加えていき、合計60mlを添加した後、乳酸を添加してpHを6として反応を終了させ、I液とした。この段階において、L-グルコースとグルコース転換物(主としてフルクトース)の比が約6:4となる。一方、ラクトース1kgを同様に精製水2,000mlに溶解し、攪拌しながら10(w/v)%水酸化ナトリウム溶液10mlを添加し、21〜23℃で密封静置する。その後I液と同様に、pH9以上を保つように10(w/v)%水酸化ナトリウム溶液10mlずつを加えていき、合計140mlを添加した後、乳酸を加えてpHを6として反応を終了させ、II液とする。この段階で、異性化ラクトースとラクトース減成物(主としてガラクトース)の比が約5:5となる。前記I液とII液を19:1の割合で混合し、異性化糖混合物とする。この混合物は上記表2に示す組成を有する。
【0021】
続いて、本発明の実施例の処方を示す。
【0022】
[実施例1] 皮膚用ローション剤
Figure 0003636271
製法:(1)〜(6)を順次(7)に添加混合し、均一とする。
【0023】
[実施例2] 皮膚用乳剤
Figure 0003636271
製法:(1)〜(6)の油相成分を混合,加熱して均一に溶解し、70℃に保つ。一方、(7)〜(10)の水相成分を混合,加熱して均一とし、70℃とする。この水相成分に前記油相成分を攪拌しながら徐々に添加して乳化し、冷却後40℃にて(11)〜(14)をあらかじめ混合,均一化して添加する。
【0024】
[実施例3] 皮膚用ゲル剤
Figure 0003636271
製法:(5)に(2)を均一に溶解した後、(1)に(4)を溶解して添加し、次いで(3)を加えて増粘させ、(6)〜(10)を混合後添加する。
【0025】
[実施例4] 皮膚用クリーム
Figure 0003636271
製法:(1)〜(7)の油相成分を混合,溶解して75℃に加熱する。一方、(8)〜(18)の水相成分を混合,溶解して75℃に加熱する。次いで、上記水相成分に油相成分を添加して予備乳化した後、ホモミキサーにて均一に乳化し、冷却する。
【0026】
[実施例5] 水中油型乳剤性軟膏
Figure 0003636271
製法:(1)〜(4)の油相成分を混合,溶解して均一とし、75℃に加熱する。一方、(5)〜(12)の水相成分を混合,溶解して75℃に加熱し、これに前記油相成分を添加して乳化し、冷却する。
【0027】
[実施例6] 皮膚用リポソーム剤
Figure 0003636271
製法:(1)〜(9)を50℃にて(10)に分散させ、超音波処理してリポソームを形成させた後、遠心分離によりリポソームを回収する。
(リポソーム液)
上記リポソームを10.0重量%となるように、10.0重量%エタノール水溶液に分散させる。
【0028】
[実施例7] 柔軟化粧水
Figure 0003636271
製法:(1)に(9),(10)を溶解し、(2)〜(8)とともに順次(11)に添加して混合し、均一とする。なお(8)のアミノ酸混合液としては、表6に示す組成のものを用いた。
【表6】
Figure 0003636271
【0029】
[実施例8] 美肌クリーム
Figure 0003636271
製法:(1)〜(5)の油相成分を混合,溶解して75℃に加熱する。一方、(6)〜(14)の水相成分を混合,溶解して75℃に加熱する。次いで、上記水相成分に油相成分を添加して予備乳化した後、ホモミキサーにて均一に乳化し、冷却後40℃にて(16)を(15)に溶解して加え、均一に混合する。なお(12)のアミノ酸混合液としては、表6に示す組成のものを用いた。
【0030】
[実施例9] エモリエントクリーム(油中水型)
Figure 0003636271
製法:(5),(6)を(14)の一部に溶解して50℃とし、50℃に加熱した(4)に攪拌しながら徐々に添加する。これをあらかじめ混合し70℃に加熱溶解した(1)〜(3)及び(7)に均一に分散し、これに(8)〜(13)を(14)の残部に溶解して70℃に加熱したものを攪拌しながら添加し、ホモミキサーにて乳化する。冷却後、40℃にて(15)を添加,混合する。
【0031】
[実施例10] メイクアップベースクリーム
Figure 0003636271
製法:(1)〜(4)の油相成分を混合し、75℃に加熱して均一とする。一方(5)〜(8)の水相成分を混合し、75℃に加熱,溶解して均一とし、これに(9)〜(11)の顔料を添加し、ホモミキサーにて均一に分散させる。この水相成分に前記油相成分を添加し、ホモミキサーにて乳化した後冷却し、40℃にてあらかじめ混合し均一とした(12)〜(16)と、(17)を順次添加,混合する。なお(16)のアミノ酸混合液としては、表7に示す組成のものを用いた。
【表7】
Figure 0003636271
【0032】
[実施例11] 乳液状ファンデーション
Figure 0003636271
製法:(1)〜(5)の油相成分を混合し、75℃に加熱して均一とする。一方(6)〜(11)の水相成分を混合し、75℃に加熱,溶解して均一とし、これに(12)〜(16)の顔料を添加し、ホモミキサーにて均一に分散させる。この水相成分に前記油相成分を添加し、ホモミキサーにて均一に乳化した後冷却し、40℃にてあらかじめ混合し均一とした(17)〜(20)と、(21)を順次添加,混合する。
【0033】
[実施例12] ハンドクリーム
Figure 0003636271
製法:(1)〜(6)の油相成分を混合,溶解して75℃に加熱する。一方、(7)〜(15)の水相成分を混合,溶解して75℃に加熱する。次いで、上記水相成分に油相成分を添加して予備乳化した後、ホモミキサーにて均一に乳化し、冷却する。なお(14)のアミノ酸混合液としては、表7に示す組成のものを用いた。
【0034】
本発明の上記実施例のうち、実施例1〜実施例6及び実施例12について、皮膚のしわ及び皮膚弾性に対する改善効果、肌荒れ改善効果、及び保湿性,皮膚刺激感,皮膚異常の発生状況についての評価を行った。その際、表8に示す比較例についても同時に評価を行った。
【表8】
Figure 0003636271
【0035】
(1)皮膚のしわ及び皮膚弾性に対する改善効果の評価:しわや皮膚弾性の低下といった皮膚の老化症状が顕著に認められる40〜60才代の女性をパネラー(1群20名)とし、各群に本発明の実施例及び比較例のそれぞれをブラインドにて3カ月間使用させて行った。使用は、1日当たり朝,夕1回ずつとした。しわ及び皮膚弾性の各改善状況については、使用試験開始前と使用試験終了後の皮膚の状態を観察し、「改善」,「やや改善」,「変化なし」の3段階にて評価し、各評価を得たパネラー数にて表9に示した。
【0036】
【表9】
Figure 0003636271
表9より明らかなように、本発明の実施例使用群では、全パネラーにおいて皮膚のしわ及び皮膚弾性の改善傾向が認められており、皮膚のしわについては70%以上、皮膚弾性については80%以上のパネラーにおいて明確な改善が見られた。これに対し、2-ヒドロキシ脂肪酸のみを含有する比較例1、2-ヒドロキシ脂肪酸と異性化糖混合物を含有する比較例2、2-ヒドロキシ脂肪酸とキトサンを含有する比較例3、及び2-ヒドロキシ脂肪酸とアミノ酸類とを含有する比較例4の各使用群においては、ほとんどのパネラーで改善傾向は見られたが、明確な改善を認めたのは皮膚のしわについては25%〜55%、皮膚弾性については50%〜60%にとどまっていた。また、キトサン及びアミノ酸を含有する比較例5、異性化糖混合物,キトサン及びアミノ酸を含有する比較例6、異性化糖混合物及びアミノ酸類を含有する比較例12の各使用群では、皮膚のしわについて明確な改善を認めたのは1例又は2例に過ぎず、5例又は6例については改善を認めなかった。皮膚弾性についても、明確な改善を認めたのは25%〜45%に過ぎなかった。
【0037】
(2)肌荒れ改善効果の評価:顕著な肌荒れ症状を呈する男女パネラー20名を1群とし、各群に実施例1〜実施例6,実施例12、及び比較例1〜比較例6,比較例12をそれぞれブラインドにて1日2回3カ月間使用させ、使用開始前及び使用終了後の皮膚状態をマイクロスコープにより観察し、表10に示す判定基準に従って評価,点数化して、20名の平均値にて表11に示した。
【表10】
Figure 0003636271
【0038】
【表11】
Figure 0003636271
表11より明らかなように、本発明の実施例使用群では、いずれも皮膚の状態はほぼ良好な状態まで改善されていた。これに対し、各比較例使用群では肌荒れの改善は認められるものの、その改善度はいずれにおいても不十分であった。
【0039】
(3)保湿性,皮膚刺激感及び皮膚異常の発生状況の評価:20〜50才代の女性パネラー20名を1群とし、2週間の使用試験を行い、使用した試料についての保湿性,皮膚刺激感及び皮膚異常の発生状況について評価した。試料の使用は、実施例1〜実施例6及び実施例12、比較例1〜比較例6及び比較例12について、各パネラーにそれぞれブラインドにて1日2回塗布させて行わせた。使用時の保湿性については、表12に示す評価基準に従って官能評価させて点数化し、20名の平均値を求めた。皮膚刺激感については、使用時に感じるヒリヒリ感,チクチク感,ほてりといった刺激感や不快感について、表13に示す基準に従って評価させて点数化し、20名の平均値を求めた。皮膚異常の発生状況については、使用期間中に発赤,発疹及び浮腫といった皮膚異常が発生したかどうかを観察し、かかる異常反応が発生した場合にはその程度を表14に示す基準に従って点数化し、各パネラーにおける評価点の累計について20名の平均値を求めた。これらの結果は表15にまとめて示した。
【表12】
Figure 0003636271
【表13】
Figure 0003636271
【表14】
Figure 0003636271
【0040】
【表15】
Figure 0003636271
表15より明らかなように、本発明の実施例使用群では、保湿性について非常に高い評価が得られており、皮膚刺激感についても、微妙に感じられた程度であった。また使用期間中の皮膚異常についても、一部のパネラーでわずかに発赤と発疹を認めた程度であった。一方、比較例使用群でも保湿性についての評価はほぼ良好であったが、比較例1〜比較例4使用群で各対応する実施例使用群に比して若干低い評価となっていた。皮膚刺激感については、2-ヒドロキシ脂肪酸のみを含有する比較例1と、2-ヒドロキシ脂肪酸とアミノ酸類とを含有する比較例4使用群でやや感じられていた。また比較例1及び比較例4使用群で、若干の皮膚異常の発生が認められた。
【0041】
なお本発明の実施例については、25℃で6カ月間保存した場合に、含有成分の分離や凝集,析出、変色,変臭等の状態変化は一切認められなかった。また、男性パネラー30名による48時間の閉塞貼付試験においても、即時型及び遅延型の皮膚刺激性反応は認められなかった。
【0042】
【発明の効果】
以上詳述したように、本発明により、保湿作用,角化正常化作用及び真皮線維芽細胞活性化作用が相乗的に増強され且つ持続的であり、有効な皮膚の老化症状の改善,防止作用、肌荒れ改善作用及び美肌作用を有し、さらに低刺激性を示す皮膚外用剤を得ることができた。
【図面の簡単な説明】
【図1】本発明で皮膚外用剤に含有させる各成分の線維芽細胞活性化作用について示す図である。
【符号の説明】
1 試料1
2 試料2
3 試料3
4 陽性対照[0001]
BACKGROUND OF THE INVENTION
The present invention synergistically enhances and sustains moisturizing action, keratinization normalizing action and dermal fibroblast activation action, and effectively improves and prevents skin aging symptoms, skin roughening action and skin beautifying action. In addition, the present invention relates to an external preparation for skin that exhibits low irritation. More specifically, one or more of 2-hydroxy fatty acids, a mixture of sugars isomerized by the action of an alkali hydroxide solution, one or more selected from chitosan and its derivatives, amino acids and The present invention relates to an external preparation for skin containing one or more of the derivatives.
[0002]
[Prior art]
It has been shown that 2-hydroxy fatty acids have an excellent effect on improving skin keratinization abnormalities and can activate dermal fibroblasts to improve aging symptoms such as skin wrinkles and blemishes. Van Scott et al. (Cutis 43 (3) 222-228 (1989), Japanese Patent Application Laid-Open No. 5-139947, etc.) and skin external preparations such as cosmetics containing them have been marketed.
[0003]
However, in order to effectively improve aging symptoms such as skin wrinkles and blemishes in a short period of time, it is necessary to add a considerably large amount of 2-hydroxy fatty acid, and the expression of skin irritation has been a problem. In addition, since the action of 2-hydroxy fatty acid is transient, it is necessary to apply it to the skin several times a day to obtain an effective action, which is complicated and results in exacerbating the skin irritation reaction. It was.
[0004]
[Problems to be solved by the invention]
Therefore, in the present invention, the content of 2-hydroxy fatty acid is reduced as much as possible, the skin irritation is alleviated, and the moisturizing action, keratinization normalizing action and dermal fibroblast activation action are synergistically enhanced. In addition, an object of the present invention is to obtain an external preparation for skin that is effective and effective in improving and preventing skin aging symptoms, and has an effect of improving rough skin and a beautiful skin.
[0005]
[Means for Solving the Problems]
As a result of various studies to solve the above-mentioned problems, the present inventors obtained a mixture of sugars isomerized by the action of an alkali hydroxide solution, chitosan and its derivatives, amino acids and their derivatives, and 2-hydroxy fatty acids. When used in combination with 2-hydroxy fatty acid, the moisturizing action, keratinization normalizing action, and dermal fibroblast activation action are synergistically improved and sustained, and necessary to obtain an effective effect. Has been found to be able to be greatly reduced, and further, it has been found that an effect of improving rough skin and an effect of beautifying skin that are more than expected can be obtained, and the present invention has been completed.
[0006]
That is, the present invention relates to one or more 2-hydroxy fatty acids, a mixture of sugars isomerized by the action of an alkali hydroxide solution, one or more selected from chitosan and derivatives thereof, and amino acids. And one or more of the derivatives thereof are contained in a skin external preparation base.
[0007]
[Action]
In the present invention, the synergistic and sustained activation action of the fibroblasts obtained by the combined use of each component and the synergistic improvement of the exfoliating action are shown below.
[0008]
First, human-derived fibroblasts are seeded in a 96-well microplate so as to be 2.0 × 10 4 cells per well, and after 24 hours, each sample shown in Table 1 has the final concentration shown in the same table. The cells were cultured at 37 ° C. in Dulbecco's modified basal nutrient medium (DMEM) containing 1.0 vol% fetal calf serum added as described above. After 0.5, 1, 2, and 4 hours from the start of the culture, the medium was replaced with DMEM containing 20 μg / ml of 2- (4,5-dimethyl-2-thiazolyl) -3,5-diphenyltetrazolium bromide (MTT). After culturing at 0 ° C. for 2 hours, formazan generated by the opening of the tetrazolium ring was measured by absorbance at 560 nm. A system cultured only with DMEM supplemented with 1.0 vol% fetal calf serum was used as a control, and a system cultured with DMEM supplemented with 5.0 vol% fetal calf serum was used as a positive control. The results are shown in FIG. 1 by the relationship between the activation index in which the absorbance in the control is 100.0 and the culture time in the medium containing each sample. In addition, the isomerized sugar mixture in Table 1 relates to a production example described later, and its composition is as shown in Table 2.
[Table 1]
Figure 0003636271
[Table 2]
Figure 0003636271
[0009]
In FIG. 1, when sample 1 containing only 2-hydroxyacetic acid was added (1), the activation index reached its maximum (275.4) after 2 hours of culture and decreased thereafter. When sample 2 containing a mixture of 2-hydroxyacetic acid and isomerized sugar was added (2), the activation index was still the maximum after 2 hours of culture, but the activation index was 336.3 and fibroblasts. An enhanced activation effect was observed. On the other hand, when the sample 3 containing 2-hydroxyacetic acid, isomerized sugar mixture, chitosan and glycine was added (3), the activation index reached 427.8, and did not decrease even after 4 hours of culture. It was kept high. That is, when 2-hydroxy fatty acid, isomerized sugar mixture, chitosan and amino acid, which are essential components of the present invention, are included, it was shown that the activation of fibroblasts is synergistically enhanced and sustained. . For the positive control (4), the activation index reached the maximum (157.5) after 2 hours of culture.
[0010]
Next, the keratin removing action was evaluated using an aqueous solution containing the components shown in Table 3 as a sample. In the evaluation, 10 patients with keratoproliferative disorder were grouped into each group, and each sample solution shown in Table 3 was blindly used twice a day, 0.5 ml on the back for 1 week, before the start of use and The state of the stratum corneum after use was compared by microscopic observation of samples collected by tape stripping. The state of the stratum corneum was evaluated by the degree of multiple peeling, scored according to the criteria shown in Table 4, and the average value of 10 persons was obtained and shown in Table 5.
[Table 3]
Figure 0003636271
[Table 4]
Figure 0003636271
[0011]
[Table 5]
Figure 0003636271
As is apparent from Table 5, in the sample 8 application group containing 2-hydroxyacetic acid, isomerized sugar mixture, chitosan and glycine, which are essential components of the present invention, the degree of multiple exfoliation after use is remarkably improved. It was shown that the accumulated stratum corneum without exfoliation was removed well by excessive keratin growth. In contrast, Sample 1 containing 2-hydroxyacetic acid alone, and Sample 5 to Sample 7 using group containing 2-hydroxyacetic acid and an isomerized sugar mixture, chitosan and glycine each had a keratin multiple exfoliation degree. Although an improvement was observed, the degree was lower than that in the group using sample 8, and in the group using sample 2 to sample 4 each containing isomerized sugar mixture, chitosan and glycine alone, the degree of significant exfoliation of keratin was significant. There was no improvement.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, 2-hydroxy fatty acids having 2 to 10 carbon atoms can be preferably used. For example, 2-hydroxyacetic acid (glycolic acid), 2-hydroxypropionic acid (lactic acid), 2-hydroxybutanoic acid (2-hydroxybutyric acid), 2-hydroxypentanoic acid (2-hydroxyvaleric acid), 2-hydroxyhexanoic acid (2-hydroxycaproic acid), 2-hydroxyheptanoic acid (2-hydroxyenanthic acid), 2-hydroxyoctanoic acid (2-hydroxycaprylic acid), 2-hydroxynonanoic acid (2-hydroxypelargonic acid), 2-hydroxy Linear saturated fatty acid having a hydroxyl group at the 2-position, such as decanoic acid (2-hydroxycapric acid), 2-hydroxypropenoic acid (2-hydroxyacrylic acid), 2-hydroxy-trans-2-butenoic acid (2-hydroxycrotonic acid) ), 2-hydroxy-cis-2-butenoic acid (2-hydroxyisocrotonic acid), 2-hydroxy-2-hexenoic acid, 2-hydroxy-3-hexenoic acid, 2-hydroxy-4- Xenoic acid, 2-hydroxy-5-hexenoic acid, 2-hydroxy-2-heptenoic acid, 2-hydroxy-3-heptenoic acid, 2-hydroxy-5-heptenoic acid, 2-hydroxy-6-heptenoic acid, 2- Hydroxy-cis-2-octenoic acid, 2-hydroxy-trans-2-octenoic acid, 2-hydroxy-3-octenoic acid, 2-hydroxy-cis-2-nonenoic acid, 2-hydroxy-trans-2-nonenoic acid , 2-hydroxy-3-nonenoic acid, 2-hydroxy-2-decenoic acid, 2-hydroxy-4-decenoic acid, 2-hydroxy-9-decenoic acid, etc., a linear monoenoic acid having a hydroxyl group at the 2-position, 2 Dienoic acid having a hydroxyl group at the 2-position, such as 2-hydroxy-2,4-hexadienoic acid (2-hydroxysorbic acid), 2-hydroxy-3-methylbutanoic acid (2-hydroxyisovaleric acid), 2-hydroxy-2- Ethylbutanoic acid, 2-hydroxy-2-methylpentanoic acid, 2-hydroxy-4-methylpentanoic acid (2-hydroxyisocaproic acid , 2-hydroxy-2-ethylhexanoic acid, 2-hydroxy-7-methyloctanoic acid (2-hydroxyisononanoic acid), etc. Examples thereof include tricarboxylic acid having a hydroxyl group at the 2-position, such as dicarboxylic acid and citric acid, and one or more of these are selected and used. The content in the external preparation for skin is suitably about 0.01 to 5.0% by weight in consideration of the preparation stability, bioavailability and the like.
[0013]
A mixture of sugars isomerized by the action of an alkali hydroxide solution, which is the second essential component in the present invention, was obtained by isomerizing sugars with an alkali hydroxide solution such as sodium hydroxide or potassium hydroxide. A reaction product mixture, in particular glucose or lactose isomerized, or a mixture thereof is preferably used. These can be produced by the method described in Japanese Patent Publication No. 48-1504. As the content in the external preparation for skin, about 0.01 to 10.0% by weight is appropriate considering the preparation stability, bioavailability and the like.
[0014]
Examples of chitosan and its derivatives, which are the third essential component in the present invention, include chitosan having a molecular weight of about 10,000 to 100,000 and quaternized derivatives such as partially deacetylated chitin and N-trimethylated chitosan. From these, one or more are selected and used. The content in the external preparation for skin is appropriately about 1.0 × 10 −6 to 1.0% by weight in consideration of the influence on the physical properties of the preparation.
[0015]
As the fourth essential component in the present invention, amino acids and derivatives thereof include monoamino monocarboxylic acids such as glycine, L-alanine, L-valine, L-leucine, and L-isoleucine, L-aspartic acid, and L-glutamic acid. Monoaminodicarboxylic acids (acidic amino acids) such as L-lysine, L-arginine and other diaminomonocarboxylic acids (basic amino acids), L-serine, L-threonine-containing amino acids, L-asparagine, L- Amino acids having an amide group such as glutamine, sulfur-containing amino acids such as L-cysteine, L-cystine and L-methionine, amino acids having an aromatic ring such as L-phenylalanine and L-tyrosine, L-histidine, L-tryptophan, L -Amino acids having a heterocyclic ring such as proline and L-oxyproline, dipeptides such as glycylglycine, glycylalanine and alanylalanine, It is and methyl substituted derivatives such as methyl glycine, is used to select one or more from these. In order to improve keratinization, rough skin, and beautiful skin, glycine, L-alanine, L-serine, L-threonine, L-aspartic acid, L-glutamic acid, L-arginine, L-lysine, L- Tryptophan, L-proline, glycylglycine and trimethylglycine can be particularly preferably used. The content of these amino acids and derivatives thereof in the external preparation for skin is appropriately about 0.01 to 10.0% by weight in consideration of formulation stability, bioavailability and the like.
[0016]
The content ratio of each of the above components in the present invention is such that the mixture of sugars isomerized by the action of 2-hydroxy fatty acid and an alkali hydroxide solution is 1:10 to 10: 1, 2- The hydroxy fatty acid and chitosan and derivatives thereof are in the range of 10,000: 1 to 1: 100 by weight ratio, and the 2-hydroxy fatty acid and amino acid and derivatives thereof are in the range of 1: 100 to 100: 1 by weight ratio. It is preferable to do.
[0017]
The skin external preparation according to the present invention includes oils, waxes, hydrocarbons, fatty acids, lower alcohols, higher alcohols, polyhydric alcohols, esters, and surfactants that are commonly used in external preparation bases. , Water-soluble polymer compounds and the like can be contained. Furthermore, other skin cell activators, anti-inflammatory agents, reactive oxygen species scavengers, whitening agents, moisturizing agents, ultraviolet absorbers, antiseptic / antifungal agents, fragrances and the like can be contained.
[0018]
The external preparation for skin according to the present invention can be provided in dosage forms such as lotions, emulsions, gels, creams, ointments and the like. Also, cosmetics for skin such as lotion, milky lotion, cream, beauty liquid, massage agent, pack, makeup base lotion, makeup base cream, makeup cosmetics such as liquid or cream foundation, hand cream, It can also be provided as body cosmetics such as leg creams and body lotions.
[0019]
【Example】
Further, the features of the present invention will be described in detail with reference to examples. First, an example of producing a mixture of sugars isomerized by the action of an alkali hydroxide solution used in the following examples is shown below.
[0020]
1 kg of D-glucose is dissolved in 2,000 ml of purified water, 10 ml of 10 (w / v)% sodium hydroxide solution is added with stirring, and the mixture is kept sealed at 21-23 ° C. Thereafter, 10 ml of 10 (w / v)% sodium hydroxide solution was added in order to keep the pH at 9 or more, 60 ml in total was added, lactic acid was added to bring the pH to 6, and the reaction was terminated. It was. At this stage, the ratio of L-glucose to glucose conversion (mainly fructose) is about 6: 4. On the other hand, 1 kg of lactose is similarly dissolved in 2,000 ml of purified water, 10 ml of 10 (w / v)% sodium hydroxide solution is added with stirring, and the mixture is kept sealed at 21-23 ° C. Then, as with solution I, add 10 ml of 10 (w / v)% sodium hydroxide solution at a time so as to maintain a pH of 9 or more, add 140 ml in total, and then add lactic acid to bring the pH to 6 to terminate the reaction. II liquid. At this stage, the ratio of isomerized lactose to lactose degradation product (mainly galactose) is about 5: 5. The liquid I and liquid II are mixed at a ratio of 19: 1 to obtain an isomerized sugar mixture. This mixture has the composition shown in Table 2 above.
[0021]
Then, the prescription of the Example of this invention is shown.
[0022]
[Example 1] Skin lotion
Figure 0003636271
Production method: (1) to (6) are sequentially added to (7) and mixed to make uniform.
[0023]
[Example 2] Emulsion for skin
Figure 0003636271
Production method: The oil phase components (1) to (6) are mixed, heated and uniformly dissolved, and kept at 70 ° C. On the other hand, the aqueous phase components (7) to (10) are mixed and heated to be uniform, and set to 70 ° C. The oil phase component is gradually added to the aqueous phase component while stirring to emulsify, and after cooling, (11) to (14) are mixed and homogenized in advance at 40 ° C.
[0024]
[Example 3] Gel for skin
Figure 0003636271
Manufacturing method: (2) is uniformly dissolved in (5), (4) is dissolved and added to (1), then (3) is added to increase the viscosity, and (6) to (10) are mixed Add after.
[0025]
[Example 4] Cream for skin
Figure 0003636271
Production method: The oil phase components (1) to (7) are mixed, dissolved, and heated to 75 ° C. On the other hand, the water phase components (8) to (18) are mixed and dissolved and heated to 75 ° C. Subsequently, after adding an oil phase component to the said water phase component and pre-emulsifying, it emulsifies uniformly with a homomixer and it cools.
[0026]
Example 5 Oil-in-water emulsion ointment
Figure 0003636271
Production method: The oil phase components (1) to (4) are mixed, dissolved and made uniform, and heated to 75 ° C. On the other hand, the water phase components (5) to (12) are mixed and dissolved, heated to 75 ° C., and the oil phase component is added thereto to emulsify and then cooled.
[0027]
[Example 6] Liposomes for skin
Figure 0003636271
Production method: (1) to (9) are dispersed in (10) at 50 ° C. and sonicated to form liposomes, and then the liposomes are collected by centrifugation.
(Liposome solution)
The liposome is dispersed in a 10.0% by weight ethanol aqueous solution so as to be 10.0% by weight.
[0028]
[Example 7] Flexible lotion
Figure 0003636271
Production method: Dissolve (9) and (10) in (1), add to (11) sequentially with (2) to (8), and mix to make uniform. As the amino acid mixed solution (8), one having the composition shown in Table 6 was used.
[Table 6]
Figure 0003636271
[0029]
[Example 8] Beautiful skin cream
Figure 0003636271
Production method: The oil phase components (1) to (5) are mixed, dissolved, and heated to 75 ° C. On the other hand, the aqueous phase components (6) to (14) are mixed and dissolved and heated to 75 ° C. Next, the oil phase component is added to the water phase component and pre-emulsified, and then uniformly emulsified with a homomixer. After cooling, (16) is dissolved in (15) at 40 ° C. and mixed uniformly. To do. As the amino acid mixed solution (12), one having the composition shown in Table 6 was used.
[0030]
[Example 9] Emollient cream (water-in-oil type)
Figure 0003636271
Production method: (5) and (6) are dissolved in a part of (14) to 50 ° C. and gradually added to (4) heated to 50 ° C. with stirring. This was mixed in advance and dissolved uniformly in (1) to (3) and (7) heated and dissolved at 70 ° C., and (8) to (13) were dissolved in the remainder of (14) to 70 ° C. The heated one is added with stirring and emulsified with a homomixer. After cooling, add and mix (15) at 40 ° C.
[0031]
[Example 10] Makeup base cream
Figure 0003636271
Production method: The oil phase components (1) to (4) are mixed and heated to 75 ° C. to be uniform. On the other hand, the water phase components (5) to (8) are mixed, heated and dissolved at 75 ° C. to make uniform, and the pigments (9) to (11) are added to this and dispersed uniformly with a homomixer. . Add the oil phase component to this water phase component, emulsify with a homomixer, cool, mix in advance at 40 ° C. to make uniform (12) to (16) and (17) sequentially, and mix To do. As the amino acid mixture (16), the composition shown in Table 7 was used.
[Table 7]
Figure 0003636271
[0032]
[Example 11] Emulsion foundation
Figure 0003636271
Production method: The oil phase components (1) to (5) are mixed and heated to 75 ° C. to be uniform. On the other hand, the water phase components (6) to (11) are mixed, heated and dissolved at 75 ° C. to make it uniform, and then the pigments (12) to (16) are added and dispersed uniformly with a homomixer. . Add the oil phase component to this water phase component, uniformly emulsify with a homomixer, cool, and mix in advance at 40 ° C. to make uniform (17) to (20) and (21) sequentially , Mix.
[0033]
[Example 12] Hand cream
Figure 0003636271
Production method: The oil phase components (1) to (6) are mixed, dissolved, and heated to 75 ° C. On the other hand, the aqueous phase components (7) to (15) are mixed and dissolved and heated to 75 ° C. Subsequently, after adding an oil phase component to the said water phase component and pre-emulsifying, it emulsifies uniformly with a homomixer and it cools. As the amino acid mixture (14), one having the composition shown in Table 7 was used.
[0034]
Of the above-mentioned examples of the present invention, with respect to Examples 1 to 6 and Example 12, the effect of improving skin wrinkles and skin elasticity, the effect of improving skin roughness, and the state of occurrence of moisture retention, skin irritation, and skin abnormalities Was evaluated. At that time, the comparative examples shown in Table 8 were also evaluated.
[Table 8]
Figure 0003636271
[0035]
(1) Evaluation of improvement effect on skin wrinkles and skin elasticity: 40 to 60-year-old women with significant skin aging symptoms such as wrinkles and skin elasticity reduction are panelists (20 per group). In addition, each of the examples and comparative examples of the present invention was used for 3 months in a blind. Use was once a day in the morning and evening. For each improvement of wrinkles and skin elasticity, observe the skin condition before the start of the use test and after the end of the use test, and evaluate it in three stages: “improvement”, “slight improvement”, and “no change”. The panel numbers obtained are shown in Table 9.
[0036]
[Table 9]
Figure 0003636271
As is clear from Table 9, in the group using the examples of the present invention, the tendency of improvement of skin wrinkles and skin elasticity was recognized in all panelists, 70% or more for skin wrinkles and 80% for skin elasticity. A clear improvement was seen in the above panelists. On the other hand, Comparative Example 1 containing only 2-hydroxy fatty acid, Comparative Example 2 containing 2-hydroxy fatty acid and isomerized sugar mixture, Comparative Example 3 containing 2-hydroxy fatty acid and chitosan, and 2-hydroxy fatty acid In each use group of Comparative Example 4 containing amino acids and amino acids, an improvement trend was observed in most panelists, but the clear improvement was observed for skin wrinkles of 25% to 55%, skin elasticity About 50% to 60%. Further, in each use group of Comparative Example 5 containing chitosan and amino acid, isomerized sugar mixture, Comparative Example 6 containing chitosan and amino acid, and Comparative Example 12 containing isomerized sugar mixture and amino acids, skin wrinkles Only 1 or 2 cases showed a clear improvement, and no improvement was observed for 5 or 6 cases. As for skin elasticity, only 25% to 45% showed a clear improvement.
[0037]
(2) Evaluation of rough skin improvement effect: 20 male and female panelists exhibiting remarkable rough skin symptoms are considered as 1 group, and each group includes Examples 1 to 6 and Example 12, and Comparative Examples 1 to 6 and Comparative Example. 12 was used twice a day for 3 months in a blind, and the skin condition before use and after use was observed with a microscope, evaluated and scored according to the criteria shown in Table 10, and averaged for 20 people. The values are shown in Table 11.
[Table 10]
Figure 0003636271
[0038]
[Table 11]
Figure 0003636271
As is clear from Table 11, the skin condition of each of the examples using the present invention group was improved to a substantially good condition. On the other hand, although improvement of rough skin was recognized in each comparative example use group, the improvement degree was inadequate in any.
[0039]
(3) Evaluation of moisture retention, skin irritation and skin abnormalities: A group consisting of 20 female panelists in their 20s and 50s, conducted a 2-week use test, and used the samples for moisture retention, skin Irritation and skin abnormalities were evaluated. The samples were used in Examples 1 to 6 and Example 12, and Comparative Examples 1 to 6 and Comparative Example 12 by applying each panel twice a day by blind. About the moisture retention at the time of use, according to the evaluation criteria shown in Table 12, it was sensory-evaluated and scored and the average value of 20 persons was calculated | required. Regarding skin irritation, irritation and discomfort such as tingling, tingling and hot flashes felt during use were evaluated according to the criteria shown in Table 13 and scored, and the average value of 20 people was obtained. Regarding the occurrence of skin abnormalities, observe whether skin abnormalities such as redness, rash and edema occurred during the period of use, and if such abnormal reactions occurred, the degree was scored according to the criteria shown in Table 14, The average value of 20 persons was calculated | required about the total of the evaluation score in each paneler. These results are summarized in Table 15.
[Table 12]
Figure 0003636271
[Table 13]
Figure 0003636271
[Table 14]
Figure 0003636271
[0040]
[Table 15]
Figure 0003636271
As is clear from Table 15, in the example use group of the present invention, a very high evaluation was obtained for the moisture retention, and the skin irritation was also felt subtly. Regarding skin abnormalities during the period of use, some panelists showed slight redness and rash. On the other hand, although the evaluation about moisture retention was also favorable in the comparative example use group, it was slightly lower than the corresponding example use groups in the comparative example 1 to comparative example 4 use groups. The skin irritation was somewhat felt in Comparative Example 1 containing only 2-hydroxy fatty acid and in Comparative Example 4 using group containing 2-hydroxy fatty acid and amino acids. Moreover, in the use group of Comparative Example 1 and Comparative Example 4, some skin abnormalities were observed.
[0041]
In the examples of the present invention, when the components were stored at 25 ° C. for 6 months, no change in state such as separation, aggregation, precipitation, discoloration, and odor change was found. Also, in the 48-hour occlusion patch test by 30 male panelists, no immediate or delayed skin irritation reaction was observed.
[0042]
【The invention's effect】
As described above in detail, according to the present invention, moisturizing action, keratinization normalizing action, and dermal fibroblast activation action are synergistically enhanced and sustained, and effective skin aging symptoms are improved and prevented. Moreover, the skin external preparation which has the rough skin improvement effect and the beautiful skin effect, and also shows low irritation was able to be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing the fibroblast activation action of each component contained in a skin external preparation in the present invention.
[Explanation of symbols]
1 Sample 1
2 Sample 2
3 Sample 3
4 Positive controls

Claims (6)

2-ヒドロキシ脂肪酸の1種又は2種以上、水酸化アルカリ溶液を作用させて異性化させた糖の混合物、キトサン及びその誘導体より選択される1種又は2種以上、及びアミノ酸及びその誘導体より選択される1種又は2種以上を含有して成る皮膚外用剤。One or more of 2-hydroxy fatty acids, a mixture of sugars isomerized by the action of an alkali hydroxide solution, one or more selected from chitosan and its derivatives, and selected from amino acids and their derivatives An external preparation for skin comprising one or more kinds. 2-ヒドロキシ脂肪酸の1種又は2種以上が、炭素数2〜10の2-ヒドロキシ脂肪酸より選択されることを特徴とする、請求項1に記載の皮膚外用剤。The skin external preparation according to claim 1, wherein one or more of the 2-hydroxy fatty acids are selected from 2-hydroxy fatty acids having 2 to 10 carbon atoms. 水酸化アルカリ溶液を作用させて異性化させた糖の混合物が、グルコース又はラクトースを異性化させたもの、及びこれらの混合物より選択されることを特徴とする、請求項1又は請求項2に記載の皮膚外用剤。The mixture of sugars isomerized by the action of an alkali hydroxide solution is selected from those obtained by isomerizing glucose or lactose, and mixtures thereof. Topical skin preparation. キトサン及びその誘導体の分子量が、10,000〜100,000であることを特徴とする、請求項1〜請求項3に記載の皮膚外用剤。The skin external preparation according to claim 1, wherein the molecular weight of chitosan and a derivative thereof is 10,000 to 100,000. アミノ酸及びその誘導体より選択される1種又は2種以上が、グリシン,L-アラニン,L-セリン,L-スレオニン,L-アスパラギン酸,L-グルタミン酸,L-アルギニン,L-リジン,L-トリプトファン,L-プロリン,グリシルグリシン及びトリメチルグリシンより選択されることを特徴とする、請求項1〜請求項4に記載の皮膚外用剤。One or more selected from amino acids and derivatives thereof are glycine, L-alanine, L-serine, L-threonine, L-aspartic acid, L-glutamic acid, L-arginine, L-lysine, L-tryptophan The external preparation for skin according to claim 1, which is selected from L, L-proline, glycylglycine and trimethylglycine. 皮膚外用剤が化粧料であることを特徴とする、請求項1〜請求項5に記載の皮膚外用剤。The skin external preparation according to claim 1, wherein the skin external preparation is a cosmetic.
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KR20120062681A (en) * 2003-11-27 2012-06-14 가부시키가이샤 시세이도 Parakeratosis inhibitor and external composition for skin
JP5241058B2 (en) * 2003-11-27 2013-07-17 株式会社 資生堂 Keratinization inhibitor and pore-reducing agent
JPWO2007046353A1 (en) * 2005-10-18 2009-04-23 メルシャン株式会社 Fibroblast activator and fibroblast activation method, collagen synthesis accelerator and collagen synthesis promotion method, skin aging inhibitor and skin aging prevention method
JP2007223909A (en) * 2006-02-21 2007-09-06 Sekisui Chem Co Ltd Anti-aging skin external composition
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