JPH10248385A - Organic acid reducing agent for citrus fruit and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an organic acid reducing agent for citrus fruits, which is not harmful to humans and animals and reduces organic acid contents in the fruits to suppress sourness to relatively improve a sweet taste by setting calcium gluconate and lacate calcium to be effective components. SOLUTION: (A) calcium gluconate and (B) lacate calcium are set to be effective components and associated with each other to remarkably increase resolution with respect to water. In addition, it is desirable that the blending rate of the components A and B is within the range of components A/B=90 to 70/10 to 30 by weight and that aqueous solution including the components A and B is sprayed to the fruits and/or leaf surfaces at fruits trees in a fruit growing period to reduce the organic acid of citrus fruits.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an organic acid-reducing agent and a method for reducing acidity of citrus fruits, and more particularly, the present invention relates to a method for reducing the content of organic acids in citrus fruits, The present invention relates to an organic acid-reducing agent for citrus fruit and an organic acid-reducing method capable of improving sweetness.

[0002]

2. Description of the Related Art Citrus fruits tend to be harvested early due to intense sales competition in the era of overproduction.
Despite the improvement of varieties, the acidity is extremely strong and the commercial value is low at present.

[0003] For this reason, there is a need for the development of a drug that reduces the organic acid content in the fruit to suppress the acidity and relatively improve the sweetness, and a drug that can control the shipping time. An example is lead arsenate.

[0004]

However, it has been found that lead arsenate accumulates toxic arsenic in fruits,
Not currently used. Recently, a few drugs have been proposed and used, but their effects are unstable,
There are drawbacks such as weakening of the tree if used continuously.

[0005] As described above, there is no satisfactory organic acid deoxidizer for citrus fruits at present, and there has been a strong development of an organic acid deoxidizer for citrus fruits which has no concern about safety for humans and animals. Is desired. The present invention is intended to solve such conventional problems, and reduces the organic acid content in citrus fruits to suppress sourness, can relatively improve sweetness, and is harmless to humans and animals. It is an object of the present invention to provide an organic acid deacidifier and an organic acid deacidification method for fruits.

[0006]

As a result of intensive studies, the present inventor has been able to solve the above-mentioned conventional problems. That is, the present invention provides an organic acid reducer for citrus fruits containing calcium gluconate and calcium lactate as active ingredients.

Another object of the present invention is to provide the above-mentioned organic acid deoxidizer for citrus fruits, wherein the solubility in water is remarkably increased by associating both active ingredients.

Further, the present invention provides the above-mentioned organic acid deoxidizer for citrus fruits, wherein the weight ratio of calcium gluconate: calcium lactate = 90-70: 10-30.

Furthermore, the present invention provides a method for reducing the acidity of citrus fruits by applying an aqueous solution containing calcium gluconate and calcium lactate to fruits and / or leaves of fruit trees during the fruit growth period. To provide.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Calcium gluconate and calcium lactate, which are the active ingredients of the present invention, can be used in various proportions. For example, calcium gluconate: calcium lactate = 90-70: 10-30 by weight. Those blended in a ratio of preferably from 85 to 75:15 to 25, especially from 80:20, are desirable because they have the highest water solubility and increase absorption into plants.

The organic acid deacidifier of the present invention is prepared by slurrying calcium gluconate and calcium lactate separately with water, mixing the two with a spray tower, and associating the two active ingredients, thereby reducing the solubility in water. Can be significantly increased. According to this embodiment, calcium gluconate and calcium lactate are not simply mixed, but both active ingredients are in a state of being forcibly bound without being crystallized (amorphous state), and both of them may have inherent properties. Not give high water solubility.

The solubility of calcium gluconate and calcium lactate in 1 liter of water at 25 ° C. is 3.5 g of calcium gluconate and 12 g of calcium lactate. However, for example, calcium gluconate: calcium lactate = 8
At 0:20, when the above-mentioned mixing method using a spray tower is applied, the solubility of the associated substance of both active ingredients is 45%.
Increases dramatically to g.

In using the organic acid-reducing agent for citrus fruits of the present invention, they are sprayed as an aqueous solution on fruits and / or leaves of fruit trees during the fruit growth period. Here, the fruit growth period means from the end of the flowering period to the harvest. At this time, the concentration of calcium gluconate and calcium lactate in the aqueous solution was 0.0
5 to 1.0% by weight, preferably 0.1 to 0.4% by weight is effective.

The organic acid deoxidizer of the present invention may be used alone in actual use, but may be mixed with various solid or liquid bases to enhance adhesion to trees and fruits. And various preparations such as solutions, granules, powders, wettable powders and emulsions. As used herein, the solid base includes clay, talc, bentonite, diatomaceous earth, kaolin, starch, calcium carbonate, and the like, and the liquid base includes water, alcohol, and general organic solvents. Also used are surfactants such as emulsifiers, dispersants, and wetting agents.

It is preferable that the organic acid deacidifier of the present invention is sprayed so that the fruits and / or leaves of the fruit tree are sufficiently wetted. The spraying amount is, for example, 300 to 600 per 10 ares.
It is on the order of liters and is preferably performed 1 to 3 times before harvesting.

[0016]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples.

In the following examples, the organic acid was measured by a titration method, converted to the amount of citric acid, and the acidity was calculated.
The sugar content was measured by a refractometer and expressed as the amount of sucrose.

Example 1 Forest citrus mandarin orange was used as a sample as a citrus fruit. During the growth period of the sample (October 29), calcium gluconate: calcium lactate = 80: 2 by weight ratio.
0 (spray tower treated)
A 1,2-, 500-, or 1000-fold water dilution was sprayed so that the fruits and leaves were sufficiently wetted. After 35 days from the spraying date, each sample was analyzed for sugar content and acid content.
Table 1 shows the results.

[0019]

[Table 1] 果 実 Treatment Fruit Weight Sugar Content Acidity Sugar Acid Ratio Ca Gluconate: Ca Lactate ( g) (%) = 80:20 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1000 times 117 10.0 1.21 8.24 500 120 10.2 1.20 8.62 250 133 10.3 1.07 9.64 No processing 120 9.9 1.41 7.43 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ * Branch processing, 10 samples collected Analysis * Spraying amount is enough to wet each treated tree.

Example 2 As a citrus fruit, Saya Miyagawa was used as a sample during the growth period of the sample (October 18 and October 29).
Two times on the day), the weight ratio of calcium gluconate: calcium lactate = 80: 20 (spray tower treated) was used, and a 250-, 500- or 1000-fold water-diluted solution thereof was used. Sprayed to wet.
Fifteen days after the last application date, each sample was analyzed for sugar and acidity. Table 2 shows the results.

[0021]

[Table 2] 果 実 Treatment Fruit weight Sugar content Acidity Sugar acid ratio Ca gluconate: Ca lactate ( g) (%) = 80:20 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1000 times 144 10.1 0.92 10.9 500 146 10.2 0.90 11.3 250 169 10.2 0.84 12.1 No processing 155 9.8 1.00 9.8 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ * Branch processing, 10 samples collected Analysis * Spraying amount is enough to wet each treated tree.

From the results of Examples 1 and 2, the organic acid deoxidizer of the present invention containing calcium gluconate and calcium lactate as active ingredients was sprayed to decrease the organic acid content of Unshu mandarin orange, It was clearly observed to improve sweetness. In addition, the spraying liquid concentration was carried out at three concentrations, and a higher sugar acid ratio was obtained at 250 times.

[0023]

According to the present invention, the organic acid content in citrus fruits can be reduced by reducing the content of organic acids in citrus fruits, sourness can be suppressed, and the sweetness can be relatively improved. Agents and organic acid deacidification methods are provided.

Claims (4)

[Claims] 1. An organic acid reducer for citrus fruits comprising calcium gluconate and calcium lactate as active ingredients. 2. The organic acid deoxidizer for citrus fruits according to claim 1, wherein the solubility in water is remarkably increased by associating both active ingredients. 3. The organic acid deoxidizer for citrus fruits according to claim 1, wherein the weight ratio of calcium gluconate: calcium lactate = 90-70: 10-30. 4. A method for reducing the acidity of citrus fruits by applying an aqueous solution containing calcium gluconate and calcium lactate to fruits and / or leaves of fruit trees during the fruit growth period.