CN103766477A - Composite organic acid preparation for preventing and treating postharvest penicilliosis of citrus - Google Patents

Abstract

The invention discloses a composite organic acid preparation for preventing and treating postharvest penicilliosis of citrus. The composite organic acid preparation comprises the following raw materials in percentage by weight: 0.1-5 percent of propionic acid or propionate, 0.05-5 percent of acetic acid or acetate, 0.5-5 percent of lactic acid or lactate, 1-10 percent of ascorbic acid or ascorbate, 1-10 percent of C2-C8 organic acid or C2-C8 organic acid salts, and 1-20 percent of more than one thickener. The composite organic acid preparation disclosed by the invention has the advantages of high-efficiency sterilization, no toxicity and harm to human and environment, low cost, simple process and the like and is superior to other preservatives; by adopting the composite organic acid preparation, the antioxidation of fruits can be improved, the fruit senescence and the reduction of various enzyme activities in fruits are delayed, and the disease resistance of the fruits is improved.

Description

Compound Organic Acid Preparation for Controlling Postharvest Penicillium of Citrus

the

technical field

The invention relates to a chemical agent, in particular to a compound organic acid preparation for preventing and treating postharvest blue mold of citrus.

Background technique

At present, the commonly used method to control post-harvest diseases is to use chemical fungicides, and the use of a large number of chemical fungicides is likely to cause safety problems such as pesticide residues, which also makes the export trade situation of my country's citrus not optimistic. The rate of excessive pesticide residues is high.

In addition, an emerging technology is bio-control bacteria preservatives, which have relatively high temperature requirements during preservation and use, which will cause great trouble and unnecessary losses to fruit farmers.

Contents of the invention

The purpose of the present invention is in order to research a kind of efficient, cheap, safe citrus antiseptic and fresh-keeping agent.

The technical solution of the present invention is: a compound organic acid preparation for preventing and treating postharvest blue mold of citrus fruits, the organic acid preparation includes more than one of the following raw materials in weight percentage: propionic acid or propionate 0.1% to 5% %, acetic acid or acetates 0.05% to 5%, lactic acid or lactates 0.5% to 5%, ascorbic acid or ascorbates 1% to 10%, C ₂ ~C ₈ organic acids or C ₂ ~C ₈ organic acids Salt 1~10%. The organic acid preparation includes more than one thickener with a weight percentage of 1% to 20%, including: sodium carboxymethylcellulose, carrageenan, agar, pectin, gelatin, sodium alginate, dextrin, gum arabic, Guaiac Gum, Locust Bean Gum.

The preparation steps of the organic acid preparation are: (a) adding the organic acid or its salts into the reaction kettle according to the required content requirements, and stirring until they are all dissolved to form a solution; (b) heating the solution obtained in (a) for 40-40 ~ 60°C or without heating, slowly add the stabilizer, stir, let stand for 5-30 minutes to fully dissolve the stabilizer, cool to room temperature, and form an organic acid preparation. Step (a) The organic acid or its salts are the above-mentioned propionic acid or propionates, acetic acid or acetates, lactic acid or lactates, ascorbic acid or ascorbates, C ₂ ~C ₈ organic acids or C ₂ ~C ₈ organic acid salts.

The prepared organic acid preparation can be made into water agent, suspension agent and powder agent, and the harvested citrus fruits are preserved by spraying and soaking.

The organic acid preparation specifically takes raw materials including the following raw materials in weight percentage: 1% to 5% of calcium propionate, 0.05% to 1% of acetic acid, 0.5% to 2% of lactic acid, 1% to 5% of ascorbic acid, carboxymethyl cellulose Sodium or carrageenan 10% to 20%, water to make up to 100% required.

The preparation steps of the organic acid preparation are: (a) adding calcium propionate and ascorbic acid into the reaction kettle according to the required content requirements, and stirring until they are all dissolved to form a solution; (b) heating the solution obtained in (a) to 50- 60°C, slowly add sodium carboxymethylcellulose or other thickeners, stir and heat to boil, let stand for 20-30 minutes to fully dissolve sodium carboxymethylcellulose or other thickeners, and cool to room temperature; (c ) Add acetic acid and lactic acid solutions to the obtained (b) solution according to the content requirements, and stir well to form a final solution.

The antiseptic mechanism of the present invention: add the present invention in proportion to the PDA liquid medium, insert the Penicillium italicum (the pathogenic bacteria that causes the citrus postharvest penicillium disease) bacterial suspension, and cultivate it on a shaker at 30°C and 200r/min. After 16h, the results under the observation microscope are that the present invention has suppressed the germination of Penicillium italicum spores, thereby playing an antiseptic effect; the present invention delays superoxide dismutase, chitinase, phenylalanine ammonia-lyase, B- The reduction of 1,3-glucanase enzyme activity improves the disease resistance of the fruit and delays the aging of the fruit; the invention adds ascorbic acid, which has the functions of moisturizing and anti-oxidation, and can slow down the aging degree of the fruit;

The present invention compares with current chemical technology: after 30 days, the rotten fruit rate of Gannan sweet orange is: the average value is 10% after using the chemical method for three times, and the average value is 8% after using the three processes of the present invention. Superior to existing chemical treatments;

The advantages of the present invention are: the present invention has high-efficiency sterilization, is non-toxic and harmless to people and the environment, and is superior to other antiseptic preservatives; the present invention can improve the antioxidant capacity of the fruit, delay the aging of the fruit, and delay the reduction of the activities of various enzymes in the fruit , improve the disease resistance of the fruit; in addition, the invention also has the advantages of low cost and simple process. the

Detailed ways

Example 1: (a) Add 10kg of calcium propionate and 10kg of ascorbic acid into the reactor, add 1000kg of water, stir to dissolve all of them to make a solution, heat the solution obtained in (a) to 40-60°C, and slowly add 10kg of carboxymethyl Sodium cellulose, stir and heat to boil, let it stand for 5-30 minutes to fully dissolve sodium carboxymethyl cellulose, cool to room temperature, add 50mL of acetic acid and 500mL of lactic acid to this solution, and form a final solution after fully stirring, and the fruit Soak in the final solution obtained for 30s, dry and store.

Example 2: (a) Add 50kg of calcium propionate and 50kg of ascorbic acid into the reactor, add 1000kg of water, stir to dissolve all of them to make a solution, heat the solution obtained in (a) to 40-60°C, slowly add 20kg of carrageenan, Stir and heat to boil, let stand for 5-30 minutes to fully dissolve the carrageenan, cool to room temperature, add 1000mL acetic acid and 2000mL lactic acid to this solution, stir well to form the final solution, soak the fruit in the obtained final solution for 30s , dried and stored.

Example 3: (a) Add 30kg of calcium propionate and 30kg of ascorbic acid into the reactor, add 1000kg of water, stir to dissolve all of them to make a solution, heat the solution obtained in (a) to 40-60°C, and slowly add 15kg of sodium alginate , stir and heat to boil, let it stand for 5-30 minutes to fully dissolve the sodium alginate, cool to room temperature, add 500mL of acetic acid and 1000mL of lactic acid to this solution, stir well to form the final solution, soak the fruit in the obtained final solution Medium 30s, dry and store.

Claims (7)

1. A compound organic acid preparation for preventing and treating postharvest blue mold of citrus, characterized in that: the organic acid preparation comprises more than one of the following raw materials in percentage by weight: 0.1% to 5% of propionic acid or propionate salts, acetic acid Or acetate 0.05%~5%, lactic acid or lactate 0.5%~5%, ascorbic acid or ascorbate 1%~10%, C ₂ ~C ₈ organic acid or C ₂ ~C ₈ organic acid salt 1 ~10%, the organic acid preparation also includes 1%~20% thickener. 2. according to the compound organic acid preparation of the described control citrus postharvest penicillium of claim 1, it is characterized in that: thickener comprises: sodium carboxymethyl cellulose, carrageenan, agar, pectin, gelatin, sodium alginate , Dextrin, Gum Arabic, Guaiac Gum, Locust Bean Gum. 3. according to claim 1 and 2, the compound organic acid preparation of preventing and treating post-harvest blue mold of citrus, is characterized in that: the preparation step of this organic acid preparation is: (a) organic acid or organic acid salts are mixed as required The content is required to be added to the reaction kettle, and stirred until it is completely dissolved to form a solution; (b) heat the solution obtained in (a) to 40-60°C or without heating, slowly add the thickener, stir, and stand for 5-30 minutes to make the thickener The thickener is fully dissolved and cooled to room temperature to form an organic acid preparation. 4. by the compound organic acid preparation of claim 1 or 2 described control citrus post-harvest blue mold, it is characterized in that: the prepared organic acid preparation can be made into aqua, suspending agent, powder, adopts spraying, soaking mode, to The citrus fruits are preserved after harvest. 5. by the compound organic acid preparation of the described control citrus post-harvest blue mold of claim 3, it is characterized in that: the prepared organic acid preparation can be made into aqua, suspending agent, powder, adopts spraying, soaking mode, to harvesting The last citrus fruits are preserved. 6. The compound organic acid preparation for preventing and treating postharvest blue mold of citrus according to claim 1, characterized in that: the organic acid preparation comprises the following raw materials in percentage by weight: 1% to 5% of calcium propionate, 0.05% to acetic acid 1%, 0.5% to 2% lactic acid, 1% to 5% ascorbic acid, 10% to 20% sodium carboxymethylcellulose, and water to make up to 100% required. 7. according to claim 1 or 2, the compound organic acid preparation of preventing and treating postharvest blue mold of citrus, is characterized in that: the preparation step of this organic acid preparation is: (a) adding organic acid or its salt according to required content It is required to add it into the reaction kettle, stir until it is completely dissolved to form a solution; (b) heat the solution obtained in (a) to 40-60 ° C, slowly add sodium carboxymethyl cellulose, stir and heat to boil, and let stand for 50-30 Minutes to fully dissolve the sodium carboxymethylcellulose and cool to room temperature to form the final solution.