Lemon slice freeze-drying processing steps of fruit and vegetable freeze dryer:
1) Raw material selection
Select a C-class lemon fruit with a large internal cut surface of 50-60 mm;
2) Cleaning
The selected lemon is placed in a concentration of 5% by weight of hydrogen peroxide, sonicated for 25 minutes at a temperature of 10 ° C, the ultrasonic frequency is 35 KHz;
The lemon washed with hydrogen peroxide was placed in tea water and sonicated for 30 minutes under a nitrogen atmosphere. The tea was Xinyang Maojian tea, and the tea was prepared by a conventional preparation process of tea and water at a weight ratio of 1:100. Wherein, the ultrasonic frequency of the cleaning step is ultrasonic treatment is 30KHz;
3) One freeze drying
The washed fruit is placed in a freezer and sealed at -15 ° C for 8 hours; then the frozen fruit is transferred from the freezer to the Shanghai Tuofeng brand vacuum freeze dryer working chamber at 1 ° C / min The speed is raised to 55 ° C and then kept for 6 hours, the degree of vacuum is 5Pa;
4) Slice
The lyophilized fruit is cut into a sheet having a thickness of 5 mm; the temperature at the time of slicing is -5 ° C;
5) Soaking
The sliced ​​fruit pieces were allowed to stand in a chitosan-vitamin complex solution at a temperature of 5 ° C for 3 minutes, and the chitosan-vitamin complex solution was composed of chitosan, vitamin C and ethanol in a weight ratio of 1 a mixed solution of 6:93, the ethanol being a 95% by volume ethanol solution,
The chitosan is a food grade chitosan having a molecular weight of 100,000;
6) Secondary freeze drying
The soaked lemon slices were placed in a freezer and sealed under -20 ° C for 5 hours; then the frozen lemon slices were transferred from the freezer to the vacuum freeze dryer working chamber at a rate of 3 ° C/min. After the temperature was raised to 45 ° C, the temperature was maintained for 8 hours, and the degree of vacuum was 4 Pa;
7) Packaging
Under aseptic conditions, the lemon lyophilized tablets are packaged by nitrogen filling and food packaging film, and the package is sealed in units of 2-3 freeze-dried tablets.
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Article Editor: Shanghai Tuoli Machinery Co., Ltd. {Search for the company name to find us
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