CN1147899A

CN1147899A - Agent for preservation of Lichi fruit

Info

Publication number: CN1147899A
Application number: CN 95117628
Authority: CN
Inventors: 林添波
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-10-19
Filing date: 1995-10-19
Publication date: 1997-04-23
Anticipated expiration: 2015-10-19
Also published as: CN1053319C

Abstract

This antistaling agent for litchi is prepd. by using organic acid and ascorbic acid as main raw material and adding a certain quantity of edible salt and potassium sorbate or calcium propionate, then using inorganic acid to adjust pH to below 2. By immersing litchi in this antistaling liquid for a certain time and taking out from the liquid, the litchi can be maintained 5-7 days without becoming browning, the fruit possesses no off-flavour and no change in fruit colour. It also possesses mouldproof and preservative action.

Description

Antistaling agent for litchi

The present invention relates to a kind of fruit antistaling agent, relate in particular to a kind of antistaling agent that is used for lichee.

Lichee is plucked the very easily browning blackening of its shell of back, particularly stores improper or behind certain hour, the rapid brown stain of lichee shell.This phenomenon has influenced the shelf life of lichee widely, and the commodity value of lichee largely depends on the freshness of its watchcase color.

How existing litchi preserving technology research emphatically delays its metabolic process, suppresses its respiratory intensity; Adopt medicine to suppress its germ simultaneously and take place, prevent to go rotten.But in a single day lichee breaks away from these fresh-keeping environment (condition), places on the shelf of normal temperature to sell, and shell promptly begins brown stain behind the several hrs, and its commodity value is reduced greatly.And in order to prevent that lichee from germ being taken place, and generally all adopts agricultural chemicals such as aliette, thiophanate methyl etc. to have the drug immersion lichee of certain toxicity.In sum, there are two big shortcomings in the litchi preserving technology of prior art: the one, and, be rapid brown stain in case remove fresh-keeping means lichee; The 2nd,, still have residual toxicity on the lychee exocarp that Preservation Treatment is crossed.

Purpose of the present invention overcomes the deficiencies in the prior art, and a kind of lichee brown stain capable of blocking is provided, and treated lichee can keep not brown stain of a couple of days under with wind normal temperature, and the antistaling agent for litchi of unharmful substance on the lychee exocarp after handling.

The object of the present invention is achieved like this: many researchs show, and mainly to be polyphenol oxidase cause the oxidation of substrate fruit browning.Studies have shown that further the dominant mechanism that its brown-black pool occurs during the lichee brown stain is because of aldehydes matter is oxidized to quinone, and by self-polymerization become to contain-NH2 or SH compound form.

Based on this, the present invention is through studying repeatedly and testing, under given acid condition, it is primary raw material that selection has inhibiting organic acid and ascorbic acid to the activity of the polyphenol oxidase of lichee, add certain salt and potassium sorbate or calcium propionate simultaneously, with the osmotic pressure of regulating lychee exocarp and meat and play the fungus-proof antisepsis effect.

Solid medicament formulations of the present invention is: organic acid 50-70%, vitamin C (ascorbic acid) 5-10%, salt 20-40%, potassium sorbate 0.5-0.8%.

Organic acid of the present invention is generally selected citric acid or malic acid for use.

Soup preparation method of the present invention: 1, add a certain amount of water at the solid drugs for preparing, the weight ratio of solid drugs and water is: 13: 100-22: 100, and puddle is to dissolving fully;

2, the acidity of adjusting its soup with inorganic acid reaches PH1-2.

It is primary raw material that antistaling agent for litchi of the present invention is selected organic acid and ascorbic acid for use, and adds certain salt and potassium sorbate or calcium propionate.By theory analysis and experimental results demonstrate, certain density citric acid and ascorbic acid mixed solution, adjust its pH value 2 when following, handle lichee in given soak time, treated lichee can keep 5-7 days not brown stain after taking out from soup under normal temperature ventilates, can keep more than 35 days under the refrigerated condition if put, taking-up is put under the normal temperature ventilation condition and still can be kept not brown stain of a couple of days after refrigeration a period of time, and the fruit free from extraneous odour, the pulp nondiscolouring.Simultaneously, owing to add certain salt and potassium sorbate or calcium propionate with the osmotic pressure of regulating lychee exocarp and meat and play the fungus-proof antisepsis effect.Prolonged the lichee shelf life widely, and unharmful substance on the lychee exocarp after handling.

In conjunction with the embodiments the present invention is further described:

Embodiment 1, be to handle 100 kilograms of fresh litchis, to fill a prescription:

0.49 kilogram of citric acid

0.07 kilogram of vitamin C

0.35 kilogram of salt

0.007 kilogram of potassium sorbate

Said medicine is added 7 kilograms of clear water, and puddle is to dissolving fully; Adjust acidity with hydrochloric acid and reach PH1.2.Promptly obtain antistaling agent for litchi.

Fresh litchi is immersed in the soup, every batch was soaked 10-15 minute, took out under the normal temperature environment of putting ventilation and can preserve more than 5 days in batches; If put storage under 2 ± 1 ℃ of refrigerated conditions, the shelf-life reaches 35 days, this lichee is taken out put under the normal temperature ventilated environment again, and shell still can keep not brown stain more than 3 days.

Embodiment 2, handle 100 kilograms of brown stain lichee, and its prescription is:

0.04 kilogram of citric acid

0.14 kilogram of vitamin C

0.56 kilogram of salt

0.014 kilogram of potassium sorbate

Said medicine is added 7 kilograms of clear water, and puddle is to dissolving fully; Adjust acidity with phosphoric acid and reach PH1.2.Promptly obtain to be used to handle the lychee exocarp agent for preservation of Lichi fruit of brown stain.

The brown lichee is immersed in this soup in batches, and every batch is soaked 20-30 minute (observe shell and change red being as the criterion by brown), takes out lichee and puts the normal temperature ventilation, still can keep a couple of days redness, also can put into 2 ± 1 ℃ of refrigeration a period of times again.

Antistaling agent for litchi of the present invention can make solid product according to the solid medicine prescription and sell.Proportionally add clear water during use again and dissolve medicine, and add the acidity PH1-2 that inorganic acid is adjusted soup.Suitable soup is sold as product also can to prepare acidity.

Claims

1, a kind of antistaling agent for litchi is characterized in that: selecting organic acid and vitamin C for use is primary raw material, and solid medicament formulations is: organic acid 50-70%, vitamin C 5-10%, salt 20-40%, potassium sorbate 0.5-0.8%.

2, antistaling agent for litchi according to claim 1 is characterized in that: described organic acid is generally selected citric acid or malic acid for use.

3, antistaling agent for litchi according to claim 1 is characterized in that: can add a certain amount of water at the solid drugs for preparing, form soup, the weight ratio of solid drugs and water is: 13: 100-22: 100, and puddle is to dissolving fully; Acidity with inorganic acid adjustment soup reaches PH1-2 again.