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A technology for freezing and keeping lychees fresh, which is applied in the fields of fruit and vegetable preservation, food preservation, and heating and preservation of fruits/vegetables.
Inactive Publication Date: 2012-07-18
RUYIQING GROUP
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[0003] The purpose of the present invention is to solve the problem that lychees are not easy to keep fresh, and to invent a standardized lychee freezing and fresh-keeping process that can keep lychees fresh in four seasons. The lychees processed by this process can ensure that lychees have excellent taste all year round
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[0020] The present invention will be described in further detail below in conjunction with specific examples.
[0021] What the present invention discloses is a kind of lychee freezing preservation process, which mainly includes the steps of: removing branches, selecting—cleaning—blanching—cooling—color protection—IQF freezing—slow freezing in cold storage, and finally It is bagging, metal detector detection, weighing, packing, and finished product storage.
[0022] The key of the present invention is to carry out short-term blanching treatment on lychee, and take 5% citric acid + 2% salt mixed color protection solution to carry out color protection treatment on lychee, so that lychee can have a bright red color and can be preserved for a long time ;IQF freezer freezer, the freezing temperature is -25~30℃, the freezing time is 5 minutes, and the central temperature of the product after freezing is -15~-18℃, so that the frozen lychee has no obvious cracking; and then take it at...
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Abstract
The invention relates to a fruit frozen fresh keeping process, in particular to a frozen fresh keeping process for litchis. The frozen fresh keeping process comprises the steps of: branch removal, selection, cleaning, boiling and blanching, cooling, color protection, individual quick freezing (IQF), slow freezing in a refrigeration house, bag charging, detection by a metal detection instrument, weighing, box loading and finished product warehouse entering. After the litchis are subjected to the boiling and blanching treatment, the activity of enzymes on the surfaces of litchi shells is damaged, the color change of the litchi shells can be prevented, but the tissue structure of litchi flesh cannot be influenced, so the freshness and the flavor of the litchis can be maintained. After the litchis are subjected to soaking and color protection by a color protection liquid, the appearance of the litchis is more fresh and red, meanwhile, the acidity and the salinity are proper, so the litchis are fresher and more delicious and can be stored for a long time. The quick freezing is firstly adopted, and the slow freezing in a refrigeration house is adopted, so the tissue structures of the litchis cannot be influenced because of the slow freezing, cracks caused by fast expansion of the litchis because of fast freezing cannot be caused, the shelf life of the litchis in the freezing state after the treatment can reach two years, and customers can eat the fresh litchis in four seasons in a year.
Description
technical field [0001] The invention relates to a fruit freezing and fresh-keeping technology, in particular to a litchi freezing and fresh-keeping technology. Background technique [0002] Litchi is a kind of fruit that people like very much, but lychee has the characteristics of "changing color in one day, changing fragrance in two days, changing taste in three days, and disappearing in four days". It can be seen that it is relatively difficult to keep lychees fresh. The lychees and lychees that are sold in the market through general fresh-keeping methods have the longest shelf life of no more than two months, so fresh and delicious lychees cannot be supplied throughout the year. Contents of the invention [0003] The object of the present invention is to solve the problem that lychees are not easy to keep fresh, and to invent a standardized lychee freezing and fresh-keeping process that can keep lychees fresh in four seasons. The lychees processed by this process can en...
Claims
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Application Information
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