JPH0465041B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vitality preserving agent that suppresses the decline of cut flowers and maintains their vitality for a long time.

(Prior art) It is already known that the vitality of cut flowers such as carnations, lilies, sweet peas, and dahlias, which tend to wilt due to trace amounts of ethylene gas, can be effectively maintained by pre-treating them with an aqueous solution containing a silver thiosulfate complex. ing. [H. Veen, Acta
Horiculture. 91 , 99-108, (1979)].

Furthermore, it has been announced that sulfite or sulfite water is added to the solution to prevent silver sulfide from precipitating and turning black from the above-mentioned silver thiosulfate complex salt aqueous solution (JP-A-61-207301, JP-A-61-207301, No. 62 −51601
issue).

(Problems to be Solved by the Invention) As mentioned above, silver thiosulfate complex salt aqueous solutions have the disadvantage of turning black due to the precipitation of silver sulfide during storage. Although this can be prevented by adding sulfite or sulfite water, It is not suitable for cut flowers because it emits a sulfurous odor.

(Means for Solving the Problems) The present inventor intended to stabilize a thiosulfate silver complex salt aqueous solution without using sulfite or its salt, and conducted repeated research using various substances. As a result, phosphoric acid, phosphorous acid, boric acid, metaborate,
Formic acid, oxalic acid, succinic acid, citric acid, malic acid, gluconic acid, ascorbic acid, alginic acid,
Histidine, lysine, guanidine, hydrazine, etc. are all ineffective or insufficient;
It has been found that salts of polyaminocarboxylic acids such as hexamethylenetetramine or ethylenediaminetetraacetic acid exhibit excellent effects.

The present invention is based on this knowledge, and includes adding hexamethylenetetramine to an aqueous solution of silver thiosulfate complex salt.
Alternatively, it is a cut flower vitality retaining agent made by adding a water-soluble salt of polyaminocarboxylic acid.

A silver thiosulfate complex salt aqueous solution can be prepared by a known method, for example, by mixing an aqueous solution of a sodium, potassium or ammonium salt of thiosulfate with an aqueous solution of silver nitrate or silver acetate, or by adding a silver halide such as silver chloride to the above aqueous thiosulfate solution. It can be obtained by dissolving it.

In the present invention, hexamethylenetetramine or a water-soluble salt of polyaminocarboxylic acid is added as a stabilizer to the aqueous solution of silver thiosulfate complex salt.

The polyaminocarboxylic acid referred to in the present invention is a chelate in which multiple amino groups are bonded via an alkylene group such as ethylene, and one or more hydrogen atoms in the water group of the amino group are substituted with a carboxylic acid group such as an acetate group. It means a compound having an action, and specific examples thereof include ethylenediaminetetraacetic acid, diethylenediamineacetic acid, diethylenetriaminepentaacetic acid, and the like. Polyaminocarboxylic acids are used as alkali metal salts such as sodium salts and potassium salts, or water-soluble salts such as ammonium salts.

The ratio of silver nitrate or silver halide and thiosulfate used for preparing the silver thiosulfate complex salt aqueous solution may be about 1 to 1 to 3 to 10 of the latter by weight,
The preferred amount of the stabilizer to be added to the resulting aqueous solution is 7 to 10 by weight of hexamethylenetetramine to 1 by weight of silver nitrate or silver halide, 0.03 to 6 of the water-soluble salt of polyaminocarboxylic acid, and more preferably 0.1 to 3 by weight. be.

The pH of a silver complex salt aqueous solution containing a stabilizer is usually neutral or slightly alkaline, and the preferred pH is 6.0 to 6.0.
8.5, and adjust the pH to a preferred range if desired.

The vitality preserving agent of the present invention thus obtained is colorless,
It is odorless, has a pH suitable for cut flowers, does not require light shielding or tightly sealed containers, and is extremely convenient for handling and storage as there is no risk of silver sulfide precipitation during storage.

The vitality preserving agent of the present invention can be produced in various concentrations; for example, if a solution containing 3,000 ppm in terms of silver chloride is produced, it can be mixed with water to
Add 2 stems of cut flowers before shipping to a 100-fold diluted solution.
Cut flowers can maintain their vitality for a long time by soaking them at room temperature for about 18 hours.

(Action) In the present invention, hexamethylenetetramine,
Alternatively, a water-soluble polyaminocarboxylic acid salt acts on a silver thiosulfate complex salt in an aqueous solution to prevent precipitation of silver sulfide.

Example 1 25 g of hexamethylenetetramine and water were added to a silver thiosulfate complex aqueous solution obtained by mixing and dissolving 3 g of silver nitrate (or silver chloride) and 30 g of sodium thiosulfate (as anhydride) in 800 ml of water to make a total volume of 1 L.
shall be.

Example 2 To a silver thiosulfate complex aqueous solution obtained by mixing and dissolving 3 g of silver nitrate (or silver chloride) and 20 g of sodium thiosulfate (as anhydride) in 700 ml of water, add 1 g of ethylenediaminetetraacetic acid trisodium salt and water to make up the entire amount. 1L.

Example 3 To a silver thiosulfate complex aqueous solution obtained by mixing and dissolving 3 g of silver nitrate (or silver chloride) and 20 g of sodium thiosulfate (as anhydride) in 700 ml of water, add 1 g of sodium salt of diethylenetriaminepentaacetic acid and water to make up the entire amount. 1L.

Example 4 The products of Examples 1, 2, and 3 above were placed in a bottle, sealed tightly, and stored in a constant temperature room at 40°C under light protection for 2 months. As a result, no changes were observed in any of the products, and they were clear and colorless. It was still there.

Example 5 Five doses of each of the products of Examples 1, 2, or 3 above were used.
Take 1 ml each, dilute each with tap water to 500 ml, put in a flask, and add each cut carnation flower (approximately 45-50 cm long) of red or other color to this liquid.
Add 10 bottles each and pre-soak for 2 to 18 hours at room temperature (20 to 25℃), then add 500ml of separately prepared tap water.
Transfer each to a flask containing chisel and soak.
It was left in a greenhouse at 28-30°C.

As a control, 10 cut carnations of each color cut to the same length as above were placed in tap water in the same greenhouse without pre-soaking with the products of Examples 1, 2 or 3 as described above. I left it inside.

After 6 to 7 days, all the flowers in the control group became small and withered, but in the test group pretreated with each product of Examples 1 to 3, all the flowers bloomed very large and beautifully.
As time went on, it gradually declined.

(Effects of the Invention) According to the present invention, a stable formulation that is effective in preserving the vitality of cut flowers and has good storage stability is provided. The preparation of the present invention can not only be produced by simple operations, but also because the liquid is not acidic, there is no need to avoid using metal containers, and there is no need to seal the container to prevent the release of sulfur dioxide gas. It is a colorless and odorless liquid, making it extremely easy to use.

Claims (1)

[Scope of Claims] 1. A cut flower vitality-preserving agent obtained by adding hexamethylenetetramine or a water-soluble salt of polyaminocarboxylic acid to an aqueous solution of silver thiosulfate complex salt. 2. The vitality-preserving agent according to claim 1, wherein the polyaminocarboxylic acid is ethylenediaminetetraacetic acid, diethylenediamineacetic acid, or diethylenetriaminepentaacetic acid. 3. The vitality preserving agent according to claim 1, wherein the water-soluble salt is an alkali metal salt or an ammonium salt. 4. The vitality preserving agent according to claim 1, wherein the aqueous solution of silver thiosulfate complex salt is obtained by adding silver nitrate, silver acetate or silver halide to an aqueous solution of alkali metal thiosulfate or ammonium salt, reacting and dissolving the solution. 5 The ratio of each material is 1 part silver nitrate, silver acetate or silver halide to 3 to 3 parts thiosulfate by weight.
10, hexamethylenetetramine 7 to 10 or a water-soluble salt of polyaminocarboxylic acid from 0.03 to 6, preferably from 0.1 to 3.