CN104904830A - Fresh-keeping method for litchis - Google Patents

Abstract

The invention discloses a fresh-keeping method for litchis. The method comprises the following steps: (1) preparing black tea water: according to the tea water concentration, soaking 20-25% of tea leaves based on the total weight of water, wherein the pH value of the water is properly about 7.0; (2) preparing a black tea water preservative: adding 0.5% of D-erythorbic acid, 0.3% of sodium dehydroacetate and R-polysaccharide into the black tea water, and then adding chitosan, wherein the water is sticky, a thin film is formed after the water is condensed, and the pH value is about 7.6; and (3) extraction: putting the fresh litchis with limbs in a portable manner in the black tea water preservative and soaking the fresh litchis for 1 minute and taking out and airing the litchis to form thin films out of the shells of the litchis. The method disclosed by the invention realizes the purpose of keeping the litchis fresh by way of preparing a preservative by the black water eat and chitosan through a simple process and then soaking the litchis into the preservative and airing the litchis to form protective films. The method is simple to operate and enables the litchis to be fresh for a long time, that is, the litchi rinds are still bright and the pulp is excellent in both color and luster and taste.

Description

A kind of method of lichee fresh-keeping

Technical field

The present invention relates to a kind of method that tropical fruit (tree) is fresh-keeping, particularly relate to a kind of method of lichee fresh-keeping.

Background technology

Lichee originates in SOUTHERN CHINA, is subtropical fruit tree, aiphyllium, height about 10 meters.Pericarp has fish-scale shape projection, scarlet, purplish red.Translucent congealed fat shape when pulp produces fresh, taste is fragrant beautiful, and lichee is nutritious, and taste is sweet, sour, warm in nature, enters the heart, spleen, Liver Channel; Have benefit brain and enhancing fitness, whet the appetite beneficial spleen simultaneously, has the effect promoting appetite; But not storage endurance and long-distance transport, the mode that ice cube is placed in current logistics distribution field in conventional bubble chamber is transported for long-distance lichee, but storage time is also very limited, once temperature plays change, the nutritional labeling of lichee inside is easy to be destroyed, and fruit also easily becomes rotten.Simultaneously, in transport lichee field, also human hair is had to understand the antistaling agent for litchi of various composition, such as with the antistaling agent for litchi of lime, activated earth, potassium sorbate, calcium stearate, thiophanate, cordate houttuynia, ferrous sulfate, Tea Polyphenols, potassium sorbate, water configuration, or with the antistaling agent for litchi of lignin, sucrose ester, sodium sorbate, citric acid, potassium chloride, calcium stearate, chitin, water configuration, although there is certain effect in preservation, but collocation method is complicated, and cost is higher.

Summary of the invention

The present invention is exactly for the problems referred to above, proposes a kind of method of lichee fresh-keeping, and the method operates very simple, and fresh-keeping effect is better.

For solving the problems of the technologies described above, the solution of the present invention is as follows: a kind of method of lichee fresh-keeping, is made up of following steps:

(1) prepare black tea water, tea concentration presses the 20-25% infusion of tea of water inventory, and its pH value about 7.0 is advisable;

(2) black tea water antistaling agent is prepared, add in black tea water 0.5%D-sodium isoascorbate, 0.3% sodium dehydroacetate and R-polysaccharide, then high-speed stirred is carried out, make it even, on this basis, after adding the shitosan of gross weight 20% ratio, all pour into one can high-speed stirred again can in the device of simultaneously emulsification, 15 minutes time, treat that color and luster is faint yellow or approximate lichee true qualities, watery viscosity, when can form thin film after condensation, pour out for subsequent use, now pH value is about 7.6;

(3) propose leaching, by the fresh lichee fruit with limb, put into black tea water antistaling agent in portable mode and soak one minute, or lixiviate up and down, allow black tea water antistaling agent be stained with lichee shell, be then placed in fixing place and dry, outside lichee shell, form film.

The present invention adopts black tea water to be become a kind of antistaling agent with shitosan by simple Process configuration, then immersed by lichee in this antistaling agent; dry the mode forming layer protecting film; reach the object making lichee fresh-keeping; the method is simple to operate; and lichee can be made fresh-keeping for a long time; namely litchi rind is still bright-coloured, and color and luster, the mouthfeel tool of pulp are good.

Detailed description of the invention

Detailed description of the invention the present invention is adopted to be described in more detail below.

A method for lichee fresh-keeping, is made up of following steps:

(1) prepare black tea water, tea concentration presses the 20-25% infusion of tea of water inventory, and its pH value about 7.0 is advisable;

(2) black tea water antistaling agent is prepared, add in black tea water 0.5%D-sodium isoascorbate, 0.3% sodium dehydroacetate and R-polysaccharide, then high-speed stirred is carried out, make it even, on this basis, after adding the shitosan of gross weight 20% ratio, all pour into one can high-speed stirred again can in the device of simultaneously emulsification, 15 minutes time, treat that color and luster is faint yellow or approximate lichee true qualities, watery viscosity, when can form thin film after condensation, pour out for subsequent use, now pH value is about 7.6;

(3) propose leaching, by the fresh lichee fruit with limb, put into black tea water antistaling agent in portable mode and soak one minute, or lixiviate up and down, allow black tea water antistaling agent be stained with lichee shell, be then placed in fixing place and dry, outside lichee shell, form film.

Claims (1)

1. a method for lichee fresh-keeping, is characterized in that, is made up of following steps:

(1) prepare black tea water, tea concentration presses the 20-25% infusion of tea of water inventory, and its pH value about 7.0 is advisable;

(2) black tea water antistaling agent is prepared, add in black tea water 0.5%D-sodium isoascorbate, 0.3% sodium dehydroacetate and R-polysaccharide, then high-speed stirred is carried out, make it even, on this basis, after adding the shitosan of gross weight 20% ratio, all pour into one can high-speed stirred again can in the device of simultaneously emulsification, 15 minutes time, treat that color and luster is faint yellow or approximate lichee true qualities, watery viscosity, when can form thin film after condensation, pour out for subsequent use, now pH value is about 7.6;

(3) propose leaching, by the fresh lichee fruit with limb, put into black tea water antistaling agent in portable mode and soak one minute, or lixiviate up and down, allow black tea water antistaling agent be stained with lichee shell, be then placed in fixing place and dry, outside lichee shell, form film.