JP6801381B2 - Freeze-dried sample pretreatment reagent - Google Patents
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本発明は、体外診断薬等に使用される凍結乾燥形態の検体前処理試薬であって、2種以上の糖を含有することにより測定再現性を向上させる方法に関するものである。 The present invention relates to a freeze-dried sample pretreatment reagent used for an in vitro diagnostic agent and the like, and relates to a method for improving measurement reproducibility by containing two or more kinds of sugars.
体外診断薬に使用される検体前処理試薬は液状形態である検体前処理液として、臨床検査等の分野で広く利用されている。この液状形態である検体前処理液はそのまま使用できる点で測定者への負担は軽いものの、体積と重さの点で運送面においては不利である。また通常はバルク品として供給および使用されているので、環境温度や環境湿度の影響を受けやすい。つまり、開封された状態で使用されるので濃縮の影響を避けることができず、使用継続時間毎に検体前処理液中の有効成分濃度が変動し、使用継続時間毎に正確な測定値から変動していくことが危惧される。よってこれらの問題を解決するための方法が提案されている。 Specimen pretreatment reagents used for in vitro diagnostic agents are widely used in fields such as clinical tests as sample pretreatment solutions in liquid form. Although the sample pretreatment liquid in this liquid form can be used as it is, the burden on the measurer is light, but it is disadvantageous in terms of volume and weight in terms of transportation. In addition, since it is usually supplied and used as a bulk product, it is easily affected by environmental temperature and humidity. In other words, since it is used in the opened state, the effect of concentration cannot be avoided, and the concentration of the active ingredient in the sample pretreatment solution fluctuates with each duration of use, and fluctuates from the accurate measured value with each duration of use. I am afraid that I will do it. Therefore, a method for solving these problems has been proposed.
特許文献1では、自動分析装置で使用する凍結乾燥形態の検体前処理試薬が報告されている。しかしながら特許文献1においては、検体前処理試薬の組成や製法に関しては、何ら記載されていない。凍結乾燥形態の各種試薬においては、賦形剤としての糖や蛋白質などが使用されている。糖や蛋白質などが少ない場合には形状を維持することが困難であり、輸送中に凍結乾燥物が剥離、破砕され容器の壁や蓋に付着することに起因して測定時の有効成分濃度が変動してしまい、正確な測定値から逸脱することが問題となっている。糖や蛋白質などが多い場合には形状を維持することが可能となるが、その成分や濃度が適切でない場合には再溶解した後の溶解性が悪く、その結果、測定再現性が悪くなり測定対象成分を高精度に測定することが妨げられることが問題となっていた。 Patent Document 1 reports a lyophilized sample pretreatment reagent used in an automatic analyzer. However, Patent Document 1 does not describe the composition or production method of the sample pretreatment reagent. In various freeze-dried reagents, sugars and proteins as excipients are used. It is difficult to maintain the shape when there are few sugars and proteins, and the concentration of the active ingredient at the time of measurement is high due to the freeze-dried product peeling off and crushing during transportation and adhering to the wall and lid of the container. The problem is that it fluctuates and deviates from accurate measured values. It is possible to maintain the shape when there are a lot of sugars and proteins, but when the components and concentrations are not appropriate, the solubility after re-dissolution is poor, and as a result, the measurement reproducibility is poor and the measurement is performed. There has been a problem that it is hindered from measuring the target component with high accuracy.
臨床検査の分野において、試薬の測定時における再現性は種々の試薬で求められている。そこで本発明の目的は、測定再現性が良好な、体外診断薬等に使用される凍結乾燥形態の検体前処理試薬を提供することである。 In the field of clinical examination, reproducibility of reagents at the time of measurement is required for various reagents. Therefore, an object of the present invention is to provide a freeze-dried sample pretreatment reagent used for an in vitro diagnostic agent or the like, which has good measurement reproducibility.
本発明者らは、前記課題を解決すべく鋭意検討を行なった結果、凍結乾燥形態の検体前処理試薬に存在する2種以上の糖を選定し、さらに各成分の濃度を最適化することにより、測定再現性が良好となることを見出し、本発明を完成するに至った。 As a result of diligent studies to solve the above problems, the present inventors have selected two or more kinds of sugars present in the lyophilized sample pretreatment reagent, and further optimized the concentration of each component. , It was found that the measurement reproducibility was good, and the present invention was completed.
即ち本発明は以下のとおりである。
(1)凍結乾燥濃度90.0〜180.0mg/cm3の糖アルコール、および凍結乾燥濃度90.0〜180.0mg/cm3の二糖類を含有することを特徴とする、凍結乾燥状態の検体前処理試薬。
(2)糖アルコールがマンニトールである、(1)に記載の検体前処理試薬。
(3)二糖類がスクロースである、(1)又は(2)に記載の検体前処理試薬。
That is, the present invention is as follows.
(1), characterized in that it contains a lyophilized concentration 90.0~180.0mg / cm 3 sugar alcohol, and lyophilized concentration 90.0~180.0mg / cm 3 of disaccharides, of lyophilized Specimen pretreatment reagent.
(2) The sample pretreatment reagent according to (1), wherein the sugar alcohol is mannitol.
(3) The sample pretreatment reagent according to (1) or (2), wherein the disaccharide is sucrose.
以下、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明の検体前処理試薬は、検体中の測定対象が他の分子等によって包接されている場合や過剰な妨害成分を含む場合に、検体を前処理して測定対象を測定可能な状態にするために使用される。使用にあたって、溶解液を加えて溶解させて検体前処理液として使用する。 The sample pretreatment reagent of the present invention pretreats a sample so that the measurement target can be measured when the measurement target in the sample is encapsulated by another molecule or contains an excessive interfering component. Used to do. Before use, the solution is added and dissolved to use as a sample pretreatment solution.
本発明において体外診断薬とは免疫測定法などで行われるものであり、サンドイッチ法や競合法などによって行われるものが含まれる。 In the present invention, the in vitro diagnostic agent is used by an immunoassay method or the like, and includes a drug used by a sandwich method or a competitive method.
本発明の検体前処理試薬が用いられる測定対象としては、特に限定されるものではないが、例えば25−ヒドロキシビタミンD、ビタミンB12又は葉酸等があげられる。 The measurement target to which the sample pretreatment reagent of the present invention is used is not particularly limited, and examples thereof include 25-hydroxyvitamin D, vitamin B12, and folic acid.
本発明において用いられる糖アルコールとしてはマンニトール、キシリトール、ソルビトール、ガラクチトール、リビトール等が好ましく、中でもマンニトールが好ましい。糖アルコールは、本発明の凍結乾燥状態の検体前処理試薬において、凍結乾燥濃度90.0〜180.0mg/cm3含有されるものであり、好ましくは100.0〜170.0mg/cm3、更に好ましくは105.0〜165.0mg/cm3である。ここで凍結乾燥濃度とは、[凍結乾燥状態の検体前処理試薬に含有される糖アルコールの重量]/[凍結乾燥状態の検体前処理試薬の見かけ体積]で表わされる値である。なお、凍結乾燥状態の検体前処理試薬は、内部が緻密ではなく微小な空隙を有するが、その空隙を含めて1つの固体として見た場合の体積をここでは見かけ体積とした。 As the sugar alcohol used in the present invention, mannitol, xylitol, sorbitol, galactitol, ribitol and the like are preferable, and mannitol is particularly preferable. The sugar alcohol is contained in the lyophilized sample pretreatment reagent of the present invention at a lyophilized concentration of 90.0 to 180.0 mg / cm 3 , preferably 100.0 to 170.0 mg / cm 3 . More preferably, it is 105.0 to 165.0 mg / cm 3 . Here, the freeze-dried concentration is a value represented by [weight of sugar alcohol contained in the sample pretreatment reagent in the freeze-dried state] / [apparent volume of the sample pretreatment reagent in the freeze-dried state]. The sample pretreatment reagent in the freeze-dried state has minute voids rather than dense inside, but the volume when viewed as one solid including the voids is taken as the apparent volume here.
一方、本発明に用いられる二糖類としては、例えばスクロース、ラクツロース、ラクトース、マルトース、トレハロース、セロビオース等を使用することができる。その中でもスクロースが好ましい。二糖類は、本発明の凍結乾燥状態の検体前処理試薬において、凍結乾燥濃度90.0〜180.0mg/cm3で含有されるものであり、好ましくは100.0〜170.0mg/cm3、更に好ましくは105.0〜165.0mg/cm3である。ここで凍結乾燥濃度とは、[凍結乾燥状態の検体前処理試薬に含有される二糖類の重量]/[凍結乾燥状態の検体前処理試薬の見かけ体積]で表わされる値である。なお、見かけ体積とは前述のとおりである。 On the other hand, as the disaccharide used in the present invention, for example, sucrose, lactulose, lactose, maltose, trehalose, cellobiose and the like can be used. Among them, sucrose is preferable. The disaccharide is contained in the lyophilized sample pretreatment reagent of the present invention at a lyophilized concentration of 90.0 to 180.0 mg / cm 3 , preferably 100.0 to 170.0 mg / cm 3. , More preferably 105.0 to 165.0 mg / cm 3 . Here, the freeze-dried concentration is a value represented by [weight of disaccharide contained in the sample pretreatment reagent in the freeze-dried state] / [apparent volume of the sample pretreatment reagent in the freeze-dried state]. The apparent volume is as described above.
本発明で検体前処理試薬とは、1つの試薬からなるものでもよく、また複数の試薬からなるものでもよい。検体前処理試薬が複数の試薬からなる場合、そのいずれもが前述の凍結乾燥濃度の糖アルコール及び二糖類を含有する凍結乾燥状態のものである。例えば検体前処理試薬として、アルカリ性試薬(前処理剤)と中和剤の組合せを例示することができる。前処理剤としては、例えば水酸化ナトリウム、水酸化カリウム、水酸化カルシウム、炭酸ナトリウム、炭酸水素ナトリウム、炭酸カルシウム、ホウ酸ナトリウム等を使用することができる。中和剤としては、例えばリン酸二水素カリウム、リン酸水素二カリウム、リン酸二水素ナトリウム、リン酸水素二ナトリウム、リン酸カルシウム等を使用することができる。 In the present invention, the sample pretreatment reagent may be composed of one reagent or may be composed of a plurality of reagents. When the sample pretreatment reagent is composed of a plurality of reagents, all of them are in a freeze-dried state containing the above-mentioned freeze-dried concentrations of sugar alcohol and disaccharide. For example, as a sample pretreatment reagent, a combination of an alkaline reagent (pretreatment agent) and a neutralizing agent can be exemplified. As the pretreatment agent, for example, sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate, sodium hydrogencarbonate, calcium carbonate, sodium borate and the like can be used. As the neutralizing agent, for example, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate, calcium phosphate and the like can be used.
本発明では、凍結乾燥時に蛋白質、界面活性剤、緩衝液や塩類を共有させてもよく、それらは特に限定されるものではないが、蛋白質であれば、例えばヒト血清、ヒト血清アルブミン、ウシ血清、ウシ血清アルブミン、コラーゲンペプチド、スキムミルク等を使用することができる。界面活性剤であればアニオン性界面活性剤、カチオン性界面活性剤、両性界面活性剤、非イオン性界面活性剤を使用することができる。緩衝液としては、例えばTris、MOPSO、MOPSやMES等を使用することができ、塩類としては、例えば塩化ナトリウム、塩化カリウム、塩化マグネシウム、塩化亜鉛等を使用することができる。なお、凍結乾燥時にはこれら以外にも、必要に応じて他の試薬成分等を共存させることもできる。 In the present invention, proteins, surfactants, buffers and salts may be shared during lyophilization, and they are not particularly limited, but if they are proteins, for example, human serum, human serum albumin, bovine serum, etc. , Bovine serum albumin, collagen peptide, skim milk and the like can be used. As long as it is a surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and a nonionic surfactant can be used. As the buffer solution, for example, Tris, MOPSO, MOPS, MES and the like can be used, and as the salts, for example, sodium chloride, potassium chloride, magnesium chloride, zinc chloride and the like can be used. In addition to these, other reagent components and the like can coexist as necessary during freeze-drying.
本発明の凍結乾燥状態の検体前処理試薬は、必要な成分と共に糖アルコール及び二糖類を共存させた溶液を凍結乾燥することにより、製造することができる。このとき、目的とする凍結乾燥濃度となるよう、溶液中の糖アルコール及び二糖類の濃度や凍結乾燥条件を適宜設定すればよい。 The sample pretreatment reagent in the freeze-dried state of the present invention can be produced by freeze-drying a solution in which sugar alcohol and disaccharide coexist together with necessary components. At this time, the concentrations of sugar alcohols and disaccharides in the solution and the freeze-drying conditions may be appropriately set so as to obtain the desired freeze-drying concentration.
本発明の凍結乾燥状態の検体前処理試薬は、凍結乾燥した際の容器への適度な固着性を有し、また適当な硬さを有する凍結乾燥ケーキとして得られるため、溶解液を加えた際の溶解性に優れたものである。そのため、本発明の凍結乾燥状態の検体前処理試薬を体外診断薬等に用いれば、精度よく測定することができる。 Since the sample pretreatment reagent in the freeze-dried state of the present invention can be obtained as a freeze-dried cake having appropriate adhesion to a container when freeze-dried and having appropriate hardness, when a solution is added. It has excellent solubility. Therefore, if the freeze-dried sample pretreatment reagent of the present invention is used as an in vitro diagnostic agent or the like, accurate measurement can be performed.
以下、実施例により本発明をさらに詳細に説明するが、本発明は本実施例により限定されるものではない。なお、免疫測定装置として全自動エンザイムイムノアッセイ装置AIA−CL2400、東ソー社製を用い、免疫測定用試薬として当該装置用の免疫反応試薬25−ヒドロキシビタミンDを用い、2ステップサンドイッチ法により各測定を行った。なお、各検体前処理試薬は後述したようにして調製した。 Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the present Examples. A fully automatic enzyme immunoassay device AIA-CL2400 manufactured by Tosoh Corporation was used as an immunoassay device, and an immune reaction reagent 25-hydroxyvitamin D for the device was used as an immunoassay reagent, and each measurement was performed by a two-step sandwich method. It was. Each sample pretreatment reagent was prepared as described later.
(実施例1,2、比較例1)
前処理剤と中和剤を有する検体前処理試薬を以下のように調製した。即ち、前処理剤として、300mmol/L水酸化ナトリウム水溶液に、表1に記載の濃度となるようマンニトール及びスクロースを添加した溶液を調製し、表1に記載の量を、2穴を有する試薬容器の一方の穴に分注した。中和剤として、200mmol/Lリン酸二水素カリウム水溶液に、表1に記載の濃度となるようマンニトール及びスクロースを添加した溶液を調製し、表1に記載の量を、前述の2穴を有する試薬容器の他方の穴に分注した。なおこの試薬容器は、同等の2穴を有するものである。
(Examples 1 and 2, Comparative Example 1)
A sample pretreatment reagent having a pretreatment agent and a neutralizing agent was prepared as follows. That is, as a pretreatment agent, a solution prepared by adding mannitol and sucrose to a 300 mmol / L sodium hydroxide aqueous solution so as to have the concentrations shown in Table 1, and the amount shown in Table 1 is a reagent container having two holes. Dispensed into one hole. As a neutralizing agent, a solution prepared by adding mannitol and sucrose to a 200 mmol / L potassium dihydrogen phosphate aqueous solution so as to have the concentrations shown in Table 1, and the amount shown in Table 1 has the above-mentioned two holes. It was dispensed into the other hole of the reagent container. This reagent container has two equivalent holes.
(測定再現性試験)
25−ヒドロキシビタミンD濃度10.2ng/mLであるヒト血清を検体として、実施例1,2、比較例1にて調製した凍結乾燥状態の検体前処理試薬(前処理剤及び中和剤)に溶解液(アジ化ナトリウムを含む分注水)を75μL加えて溶解し、検体前処理液を調製した。それを用いて検体を前処理し、25−ヒドロキシビタミンD濃度を測定した。これら一連の操作は前記自動免疫測定装置で行った。前処理をした後に25−ヒドロキシビタミンD濃度を測定する一連の操作を10回繰り返して、25−ヒドロキシビタミンD測定値の平均値を求めた。さらにその測定値を基に、測定再現性を算出した。結果を表1に示す。表1中、VitDは25−ヒドロキシビタミンDを示す。
(Measurement reproducibility test)
Using human serum having a 25-hydroxyvitamin D concentration of 10.2 ng / mL as a sample, it was used as a sample pretreatment reagent (pretreatment agent and neutralizer) in a freeze-dried state prepared in Examples 1 and 2 and Comparative Example 1. 75 μL of a lysate (dispensed water containing sodium azide) was added and dissolved to prepare a sample pretreatment solution. The sample was pretreated with it and the 25-hydroxyvitamin D concentration was measured. These series of operations were performed by the automatic immunoassay device. After the pretreatment, a series of operations for measuring the 25-hydroxyvitamin D concentration was repeated 10 times to obtain the average value of the 25-hydroxyvitamin D measured values. Furthermore, the measurement reproducibility was calculated based on the measured value. The results are shown in Table 1. In Table 1, VitD represents 25-hydroxyvitamin D.
表1から明らかなように、実施例1,2、比較例1は、含有されるマンニトールの絶対量及びスクロースの絶対量はそれぞれ同一である。しかしながら、得られた凍結乾燥ケーキの見かけ体積が異なるため、マンニトール凍結乾燥濃度やスクロース凍結乾燥濃度は異なっている。それを一定量の分注水で溶解したので、得られた検体前処理液の濃度は同一のはずだが、凍結乾燥濃度によって溶解のしやすさが異なり、比較例1では溶解液の液量よりも上部の検体前処理試薬が溶解しにくくなったり、溶解しても試薬容器内で均一にならず濃度勾配が生じたりして、測定の間差が大きくなり、CV21.4%と測定値に大きなばらつきを生じたと考えられる。これに対し、実施例1,2では、CV2.6%、3.4%と測定再現性が良く、これはマンニトールとスクロースとがそれぞれ適切な凍結乾燥濃度で凍結乾燥状態の検体前処理試薬に含有されていたため、溶解性に優れていたと考えられる。 As is clear from Table 1, in Examples 1 and 2 and Comparative Example 1, the absolute amount of mannitol and the absolute amount of sucrose contained are the same, respectively. However, since the obtained lyophilized cakes have different apparent volumes, the mannitol lyophilized concentration and the sucrose lyophilized concentration are different. Since it was dissolved in a certain amount of dispensed water, the concentration of the obtained sample pretreatment solution should be the same, but the ease of dissolution differs depending on the lyophilization concentration, and in Comparative Example 1, it is larger than the amount of the solution. The sample pretreatment reagent in the upper part becomes difficult to dissolve, or even if it dissolves, it does not become uniform in the reagent container and a concentration gradient occurs, resulting in a large difference between measurements, and the measured value is large at CV 21.4%. It is probable that there was some variation. On the other hand, in Examples 1 and 2, the measurement reproducibility was good at CV 2.6% and 3.4%, which means that mannitol and sucrose were used as sample pretreatment reagents in a freeze-dried state at appropriate freeze-drying concentrations. Since it was contained, it is considered that it had excellent solubility.
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