JP4066181B2 - Plant freshness preservation agent - Google Patents

Description

  The present invention relates to a plant freshness-keeping agent.

  Japan is one of the world's leading plant-consuming countries. Especially for cut flowers, how to maintain the freshness of cut flowers by cut flower producers, flower markets, cut flower retailers and consumers is an important issue. The causes of the decrease in the freshness of the plant include the action of ethylene, a plant hormone, a decrease in water uptake due to water spoilage, and a lack of nutrients in the plant. In order to overcome these problems, various plant freshness-preserving agents have been proposed so far.

  Silver thiosulfate is generally known as a compound that suppresses the action of ethylene. However, since silver thiosulfate contains silver which is a heavy metal as an active ingredient, there is a concern about environmental pollution. AIB (2-aminoisobutyric acid), AOA (aminooxyacetic acid), AVG (aminoethoxyvinylglycine), etc. are generally known as freshness-preserving agents that have an ethylene inhibitory action and do not contain heavy metals. Use is limited due to insufficient effects, increased usage, and high cost.

  For example, a plant freshness-keeping composition containing AVG (aminoethoxyvinylglycine) and AIB (α-aminoisobutyric acid) as active ingredients (see Patent Document 1), 1) α-aminoisobutyric acid or a salt thereof, 2) amino Oxyacetic acid or its salt, 3) Contains plant freshness-retaining agent (see Patent Document 2) containing at least two substances selected from silver thiosulfate as active ingredients, urea-calcium chloride salt and 2-aminoisobutyric acid or its salt There is a freshness maintaining agent (see Patent Document 3).

Moreover, the freshness of a plant is hold | maintained by releasing oxygen using hydrogen peroxide (refer patent document 4), The preservative for cut flowers which uses the hydrogen peroxide addition product of an inorganic compound as an active ingredient (patent document 5) See). Furthermore, although there is a plant freshness-keeping agent (see Patent Document 6) containing a water-soluble organic peroxide as an active ingredient, these conventional techniques cannot suppress ethylene, which is an aging hormone, and are therefore insufficient as freshness-keeping performance. Has drawbacks.
JP-A-5-238901 JP-A-7-223902 JP-A-8-301701 JP-A-61-165301 JP-A-1-249701 JP-A-5-286802

  An object of the present invention is to provide a plant freshness-keeping agent that solves the above-described problems in the prior art, has an excellent freshness-keeping effect on plants, and has no fear of environmental pollution due to heavy metal components and halogen components. It is to provide.

  As a result of intensive studies on the freshness-preserving agent composition that preserves the freshness of plants, the inventors have found that freshness-preserving agents composed of peroxides and ethylene biosynthesis inhibitors are plants, especially cut flowers such as carnations, roses, gerberas, and hydrangea. Has been found to be able to maintain its freshness over a long period of time. That is, the present invention relates to a plant freshness maintaining agent comprising a peroxide and an ethylene biosynthesis inhibitor as active ingredients.

  According to the present invention, by using a combination of a plant freshness-preserving agent and an already known peroxide and an ethylene biosynthesis inhibitor, each of them can be used alone or in combination with other compounds. A plant freshness-keeping agent having a significantly high freshness-keeping effect can be provided, and the viewing period can be extended.

  Next, the method of the present invention will be specifically described. As the peroxide in the plant freshness preservation agent according to the present invention, hydrogen peroxide, peracetic acid, percarbonate, persulfate, perborate, and other inorganic and organic peroxides can be used, but preferably Hydrogen peroxide and sodium percarbonate are used. Hydrogen peroxide having a concentration of 35% by weight and 60% by weight is commercially available, but it may be used as it is or may be diluted. The concentration of the peroxide used is 0.0001 to 10% by weight, preferably 0.001 to 5% by weight.

  As the ethylene biosynthesis inhibitor, AIB (2-aminoisobutyric acid), AOA (aminooxyacetic acid), AVG (aminoethoxyvinylglycine) or a salt thereof can be used, but preferably AIB (2-aminoisobutyric acid) or The salt is used. 2-Aminoisobutyric acid may be used as it is, or diluted with water or the like. The use concentration of 2-aminoisobutyric acid or a salt thereof is 0.0001 to 10% by weight, preferably 0.005 to 5% by weight.

  Peroxides, ethylene biosynthesis inhibitors and their salts may be added to each aqueous solution just before immersing the plant in an aqueous solution, or mixed with a peroxide and an ethylene biosynthesis inhibitor in advance. May be used. In the case of mixing in advance, the peroxide, the ethylene biosynthesis inhibitor and the salt thereof may be mixed at a weight ratio of 100 to 10 to 5000, and may be used after diluting to the concentration to be used. It is convenient to prepare a mixture of this mixture diluted to a high concentration with a small amount of water and dilute it 10 to 1000 times with water during actual use.

  In the case of mixing in advance, the peroxide is obtained by using at least one chelating agent selected from a chelating agent having two or more phosphonic acid groups and a salt thereof, a chelating agent having two or more carboxylic acid groups and a salt thereof. Further stabilization is desirable.

  Examples of the chelating agent having two or more phosphonic acid groups include 1-hydroxyethylidene-1,1-diphosphonic acid, aminotrimethylenephosphonic acid, ethylenediaminetetramethylenephosphonic acid, 1,2-propylenediaminetetramethylenephosphonic acid, diethylenetriaminepenta Examples include methylene phosphonic acid, hexamethylene diamine tetramethylene phosphonic acid, triethylene tetraamine hexamethylene phosphonic acid, and glycol ether diamine tetramethylene phosphonic acid.

  Examples of the chelating agent having two or more carboxylic acid groups include ethylenediaminetetraacetic acid, nitrilotriacetic acid, diethylenetriaminepentaacetic acid, triethylenetetraaminehexaacetic acid, and polyhydroxycarboxylic acid. These chelating agents having two or more phosphonic acid groups and chelating agents having two or more carboxylic acid groups may be free acids or in the form of salts. When used in the form of a salt, alkali metal salts, alkaline earth metal salts, ammonium salts, organic amine salts and the like can be used, but sodium salts and ammonium salts are preferably used. The amount of the chelating agent used is preferably about 1 to 50,000 ppm with respect to the mixture of the peroxide, the ethylene biosynthesis inhibitor and its salt. Moreover, you may use together other stabilizers, such as phosphoric acid, as needed.

  The plant freshness-keeping agent of the present invention includes sugars such as glucose, fructose, galactose, maltose, sucrose, and lactose, potassium nitrate, potassium sulfate, calcium nitrate, magnesium nitrate, magnesium sulfate, and ammonium nitrate as long as the effects of the present invention are not impaired. Inorganic nutrients such as monobasic potassium phosphate, monobasic ammonium phosphate, phosphoric acid and urea, pH adjusters such as citric acid, acetic acid and malic acid, quaternary ammonium salts, 8-hydroquinoline sulfate, citric acid You may use together or mix the bactericidal agent or antiseptic | preservative which has bactericidal action or antibacterial action, such as an acid salt. Further, a surfactant component having an effect of promoting water raising and phosphonic acids such as phosphonic acid and phenylphosphonic acid may be used in combination or mixed.

  As the plant to which the freshness-keeping agent of the present invention can be applied, cut flowers such as carnation, rose, gerbera, hydrangea, sweet pea, gypsophila, chrysanthemum, lily, stock, statice, gentian, gladiolus, turkey, tulip, orchid are preferred.

Next, the method of the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.
Example 1
A freshness retention test was performed using a commercially available carnation (variety Pink Francisco). Plants with the same growth state and freshness state were selected as much as possible, the stem was cut into 50 cm with a sharp blade, and the epidermis leaf of the lower 25 cm portion of the stem was cut and used. Four plants are inserted into a freshness-keeping agent in which 0.25 g of 2-aminoisobutyric acid and 0.29 g of a 35 wt% hydrogen peroxide solution are dissolved in tap water to a total amount of 1000 g, and the temperature is 23 ° C. and the humidity is 60%. Then, freshness maintenance evaluation was performed. The freshness maintenance evaluation was carried out by visual observation, and the number of days until in-roll (a phenomenon in which the petals characteristic of carnation aging become internal) and petal wilt were observed was counted. The results are shown in Table 1.
Comparative Example 1
The same procedure as in Example 1 was performed except that the freshness maintaining agent was changed to 1000 g of tap water.
Comparative Example 2
A freshness-preserving agent was prepared in the same manner as in Example 1 except that 0.25 g of 2-aminoisobutyric acid was dissolved in tap water to make the total amount 1000 g.
Comparative Example 3
The freshness maintaining agent was carried out in the same manner as in Example 1 except that 0.29 g of a 35 wt% hydrogen peroxide solution was dissolved in tap water to make the total amount 1000 g.

Example 2
As a freshness preserving agent, an aqueous solution prepared by dissolving 0.40 g of 2-aminoisobutyric acid, 0.57 g of a 35 wt% hydrogen peroxide solution, 1.0 g of glucose, and 0.1 g of citric acid in tap water to a total amount of 1000 g, The same treatment as in Example 1 was performed except that a commercially available rose (variety darling) was used. The body weight after the start of the test (total value of four cut flowers) was measured and used as an index with the body weight at the start of the test being 100. The results are shown in FIG.
Comparative Example 4
The freshness-preserving agent was the same as Example 2 except that the STS (silver thiosulfate) 5 mg / kg concentration was 1000 g.
Comparative Example 5
The freshness-preserving agent was the same as Example 2 except that 0.57 g of 35% hydrogen peroxide solution, 1.0 g of glucose and 0.1 g of citric acid were dissolved in tap water to make the total amount 1000 g.
Comparative Example 6
The freshness-preserving agent was the same as Example 2 except that 0.40 g of 2-aminoisobutyric acid, 1.0 g of glucose and 0.1 g of citric acid were dissolved in tap water to make the total amount 1000 g.
Example 3
Dissolve 7.14 g of 35 wt% hydrogen peroxide, 3.13 g of 2-aminoisobutyric acid, 12.5 g of glucose, and 0.1 g of 25 wt% ethylenediaminetetramethylenephosphonic acid pentasodium salt as a chelating agent in pure water to make a total amount of 250 g. The plant freshness-keeping agent concentrate was prepared. The concentration of hydrogen peroxide after the concentrated solution was immersed in a warm bath at 100 ° C. for 5 hours was measured to determine stability. The results are shown in Table 2.
Stability (%) = {(concentration after treatment) / (concentration before treatment)} × 100
Example 4
The same procedure as in Example 3 was carried out except that the amount of 25% by weight aqueous solution of ethylenediaminetetramethylenephosphonic acid pentasodium salt was 0.01 g. The results are shown in Table 2.
Comparative Example 7
The same procedure as in Example 3 was performed except that no chelating agent was used. The results are shown in Table 2.

Example 5
Dissolve 5.36 g of 35 wt% hydrogen peroxide, 3.75 g of 2-aminoisobutyric acid, 12.5 g of glucose, 0.25 g of citric acid and 0.05 g of aminotrimethylenephosphonic acid 50 wt% aqueous solution as a chelating agent in pure water. A plant freshness-keeping agent concentrate having a total amount of 250 g was prepared. The stability after the concentrate was immersed in a hot bath at 100 ° C. was 98%. Further, the same treatment as in Example 1 was performed using a freshness-keeping agent in which 20 g of the concentrated liquid was diluted with tap water to a total amount of 1000 g. For the test, carnation (variety Pink Francisco) was used to measure the freshness retention by visual observation and the weight of the living body (total value of four cut flowers) after the start of the test. The results are shown in Table 3 and FIG.
Comparative Example 8
The same procedure as in Example 5 was performed except that the freshness-preserving agent was changed to 1000 g of tap water. The results are shown in Table 3 and FIG.
Comparative Example 9
A freshness maintaining agent was carried out in the same manner as in Example 5 except that 0.43 g of 35% by weight hydrogen peroxide, 1.0 g of glucose and 0.02 g of citric acid were dissolved in tap water to make a total amount of 1000 g. The results are shown in Table 3 and FIG.
Comparative Example 10
A freshness maintaining agent was carried out in the same manner as in Example 5 except that 0.3 g of 2-aminoisobutyric acid, 1.0 g of glucose and 0.02 g of citric acid were dissolved in tap water to make the total amount 1000 g. The results are shown in Table 3 and FIG.

Measurement results of Example 2 and Comparative Examples 4 to 6 Measurement results of Example 5 and Comparative Examples 8 to 10

Claims (9)

A plant freshness-retaining agent comprising peroxide and ethylene biosynthesis inhibitor as active ingredients. The plant freshness-keeping agent according to claim 1, wherein the peroxide is hydrogen peroxide or sodium percarbonate. The plant freshness-keeping agent according to claim 1, wherein the ethylene biosynthesis inhibitor is 2-aminoisobutyric acid or a salt thereof. Furthermore, the plant freshness preservation agent of Claims 1-3 containing phosphonic acids. The plant freshness-keeping agent according to claim 4, wherein the phosphonic acid is at least one selected from a chelating agent having two or more phosphonic acid groups and a salt thereof. Chelating agents having two or more phosphonic acid groups are 1-hydroxyethylidene-1,1-diphosphonic acid, aminotrimethylenephosphonic acid, ethylenediaminetetramethylenephosphonic acid, 1,2-propylenediaminetetramethylenephosphonic acid, diethylenetriaminepentamethylenephosphone The plant freshness-keeping agent according to claim 5, which is at least one selected from acids, hexamethylenediaminetetramethylenephosphonic acid, triethylenetetraaminehexamethylenephosphonic acid and glycol etherdiaminetetramethylenephosphonic acid. Furthermore, the plant freshness preservation agent of Claims 1-3 containing at least 1 type chosen from the chelating agent which has two or more carboxylic acid groups, and its salt. The plant freshness-keeping agent according to claim 7, wherein the chelating agent having two or more carboxylic acid groups is one selected from ethylenediaminetetraacetic acid, nitrilotriacetic acid, diethylenetriaminepentaacetic acid, triethylenetetraaminehexaacetic acid and polyhydroxycarboxylic acid. The plant freshness-keeping agent according to claim 1, wherein the plant is a cut flower.