Litchi lasts principle and technology

From;    Author:Stand originally
Just collected the litchi fruit that receive to have " a day and color changes, 2 days and sweet change, 3 days and flavour changes, 4, 5 days outside, color, sweet, flavour all goes " say, last difficulty is greater. As manufacturing development, litchi carries sales volume year after year increases. Accordingly, master litchi to last principle, use advanced last the technology is imperative already.

1 litchi stores up last principle and condition

1 . 1 stores up physiology is characteristic
Litchi is belonged to without breathing height fructification, in good condition fructification does not have apparent breath between autumn jump change 〕 of period 〔 1 , but its respiration intensity compares ~ of big 1 of apple, banana, orange 2 〕 of 4 times 〔 . The sugar cane carbohydrase in fructification of the litchi below 30 ℃ and much more phenolic oxidation are enzymatic very active 〔 2, 3 〕 . As a result of peel thin, lobation having tortoise, join is loose between peel and pulp, the moisture in causing its pulp easily be lost; Its peel contains a lot oftogether with only peaceful material (about 7 % ) , accordingly, peel produces brown extremely easily to change 4 ~ of 〔 6 〕 , bring about fructification disease-resistant force to drop quickly, decline of color, sweet, flavour, be invaded to catch by the bacteria then and decay. Restrain dehydrate and brown changes to be able to last effectively litchi, restrain decline decay.

1 . 2 store up condition
Gu Jinli branch lasts practice proof, the air of the little energy of life that pack below microtherm condition stores up the effect is optimal 〔 2, 6, 7, 8 〕 .

1 . 2. Low temperature of 1 temperature and humidity is to lower litchi breath rate, lengthen its to store up period fundamental condition. In 1 ~ 5 ℃ falls, litchi but lay aside 1 month, color, sweet, flavour is basic and changeless 〔 2, 7 〕 . Of litchi store up the condition differs because of breed have certain difference, but average low temperature stores up comfortable Wen Wei 2 ~ 4 ℃ , relative humidity 95 % of 90 % ~ . Temperature crosses raw or cold food of low easy hair to kill, exorbitant cankered accentuation. Humidity is too low easy bring about dehydrate brown changes.

1 . 2. Air of air of 2 gas composition stores up can maintain humidity, restrain enzymatic active of much more phenolic oxidation, consequently lubricious to maintaining, sweet, flavour has 1 of distinct effect 〔 , 9, 10 〕 . But store up in air air below, its are comfortable Wen Bipu connects microtherm to store up slightly tall 1 ~ 2 ℃ . Litchi is wider to the accommodation of aeriform condition, want carbon dioxide chroma not to exceed 10 % only, do not send namely produce physiology harm. The appropriate condition that enrage tone is: Temperature 4 ℃ , carbon dioxide 5 % of 3 % ~ , oxygen 5 % of 3 % ~ . Can store up 40 days or so below this condition.
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