CN1515168A

CN1515168A - Freshness-keeping method for fruits of lichee and longan

Info

Publication number: CN1515168A
Application number: CNA031403174A
Authority: CN
Inventors: 黄祖明
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-08-26
Filing date: 2003-08-26
Publication date: 2004-07-28

Abstract

The freshness-keeping method for fruits of lichee and longan, etc. is that the fresh lichee or longan with good peel can be soaked in a container in which the edible oil is held, and then cold-stored in the cold storage whose temp. is below 10 deg.C so as to implement the goal of keeping freshness. Said invention utilizes the edible oil to soak and cover the lichee or longan, and cut off the partial active mold in the lichee or longan, and can reduce its rate of respiration, so that it can prolong the freshness storage life of lichee or longan.

Description

The preservation method of litchi and longan class fruit

Technical field

What the present invention relates to is the preservation method of fruit, especially a kind of preservation method of litchi and longan class fruit.

Technical background

Lichee and longan are the fresh and sweet fruit of a kind of taste, very popular, but it is a kind of fresh-keeping tropical fruit (tree) that is very difficult to, the harvest season of lichee or longan is summer, after fresh lichee or longan are taken from fruit tree, generally depositing after three, four days pericarp at normal temperatures promptly can blackening, and pulp also can lose new delicate flavour.In order to make lichee and longan keep fresh, researcher has proposed the fresh method of multiple lichee or longan, as: the stove drying fresh-keeping method; Chemistry removes enzyme fresh-keeping method etc., though these methods can make lichee or longan preserve at normal temperatures 5,6 days, its freshness date can not prolong a lot.Facts have proved, the fresh-keeping preferred approach of lichee or longan is refrigeration at present, fresh lichee or longan are left in the container of capping, putting into temperature then refrigerates at 4 ℃ freezer, generally can fresh-keeping two weeks, but after depositing 20 days, have the pericarp of part lichee or longan to become light brown, pulp also can be thin out, and pulp still has feeling of freshness.Preserve after one month, most of lichee or longan are just understood the pericarp blackening, and pulp is spoiled.The fresh-keeping storage period that how to prolong lichee or longan is that people wish a difficult problem of being captured.

Summary of the invention

The objective of the invention is defective, provide a kind of lichee or extending longan shelf life of making to never degenerate in 30 days, and method is simple, easily the preservation method of the litchi and longan class fruit of implementing at above-mentioned lichee and extending longan shelf life storage period weak point

The preservation method of litchi and longan class fruit of the present invention: lichee fresh, that cortex is intact or longan are immersed in the edible oil, place refrigeration in the freezer below 10 ℃.

The refrigerated storage temperature of the preservation method of litchi and longan class fruit of the present invention is: 4～-18 ℃

The described edible oil of preservation method of litchi and longan class fruit of the present invention is camellia oil, rape seed oil, soybean oil, peanut oil or cotton seed oil.

The principle of the preservation method of litchi and longan class fruit of the present invention is: utilize immersion and the parcel of edible oil to lichee or longan, cut off the active mould thin base of part in lichee or the longan, reduce its respiratory intensity, simultaneously in conjunction with deepfreeze, when refrigerated storage temperature is lower than 0 ℃, being wrapped in the outer edible oil of lichee or longan can solidify, low temperature both can further reduce its respiratory intensity, can reduce of the invasion and attack of outside bacterium again, reach the goal of the invention that prolongs the litchi and longan class fruit freshness preserving phase with this to lichee or longan.

The preservation method of litchi and longan class fruit of the present invention compared with prior art, its outstanding essence gives birth to characteristics and obvious improvement is:

1, fresh keeping time is long, when refrigerated storage temperature is below the freezing point, preserves one month lichee or longan and fresh fruit much at one; When preserving two months, pericarp deepens a little, and the pulp look thin out is a little, and it is delicious that pulp still keeps; When preserving three months, pericarp further deepens, and pulp becomes light brown, but that pulp still keeps is fresh; Preserving effect fresh-keeping after three months can descend.

2, method is simple, and the edible oil wide material sources only need to prepare to deposit container and the freezer of adorning edible oil and get final product.

3, the fresh-keeping medium edible oil that is adopted is nontoxic, harmless, because edible oil only contacts with the pericarp of lichee or longan, can not infiltrate pulp, therefore can not change the taste of pulp.

The concrete preservation method of litchi and longan class fruit of the present invention is provided in detail by following examples.

The specific embodiment

Embodiment 1: get fresh lichee or longan that Lian Ye wins, should guarantee that the cot of lichee or longan is excellent, infiltrate pulp to prevent external agency, influence fruity; Place one to have in the polymer bag of camellia oil above-mentioned lichee or longan, guarantee that each fruit all is enclosed with one deck oil film, with the sealing of polymer bag, the interior refrigeration of freezer that places temperature to be controlled at 4 ℃ gets final product.About 30 days of its freshness date.

Embodiment 2: get fresh, the intact lichee of cot, place one to have in the polymer bucket of camellia oil, lichee should all immerse in the oil, the polymer bucket that will have lichee and a camellia oil places temperature to be controlled in-5～-18 ℃ the freezer, camellia oil solidifies at low temperatures and wraps up lichee, and its freshness date can reach 60 days.

Claims

1, a kind of preservation method of litchi and longan class fruit is characterized in that: lichee fresh, that cortex is intact or longan are immersed in one have in the container of edible oil, place that refrigeration gets final product in the freezer below 10 ℃.

2, according to the preservation method of the described litchi and longan class of claim 1 fruit, it is characterized in that: refrigerated storage temperature is: 4～-18 ℃.

3, according to the preservation method of claim 1 or 2 described litchi and longan class fruit, it is characterized in that: described edible oil is camellia oil, rape seed oil, soybean oil, peanut oil, cotton seed oil.

4, according to the preservation method of the described litchi and longan class of claim 3 fruit, it is characterized in that: described edible oil is a camellia oil.

5, according to the preservation method of claim 1 or 2 described litchi and longan class fruit, it is characterized in that: described container is an airtight container.