Lotus seed freeze-drying method

A lotus seed and freeze-drying technology, which is applied in the field of food processing, can solve the problems of harmfulness to the human body, achieve the effect of smooth surface, uniform color, and increase the added value and competitiveness of products

Active Publication Date: 2018-01-16
重庆百农网投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method soaks lotus seeds in a solution prepared by disodium edetate and vitamin C. Although it effectively prevents the occurrence of browning, the chemical substance disodium edetate is added, and eating too much is harmful to the human body.

Method used

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  • Lotus seed freeze-drying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of embodiment 1 freeze-dried lotus seeds

[0042] Follow the steps below and figure 1 Operate under the conditions shown:

[0043] (1) Cooking: Remove the shells of fresh lotus seeds, wash them with running water, and then cook them to get cooked lotus seeds.

[0044] (2) Pre-freezing: first place the cooked lotus seeds at 5°C to keep the temperature of all lotus seeds at 5°C; then lower the temperature from 5°C to -40°C and keep it for 2 hours; after processing, raise the temperature Keep it at -18°C for 1 hour; then lower the temperature to -35°C and keep it for 2 hours, and the pre-freezing ends.

[0045] (3) Sublimation: Control the plate temperature of the freeze dryer at 10°C, and maintain the temperature of the lotus seeds after pre-freezing at -25°C for 15 hours; The saturated vapor pressure is 30%±5, and the vacuum degree of the freeze-drying box is 0.18 mbar.

[0046] (4) Analysis: Keep the vacuum at 0.18 mbar, heat the temperature o...

Embodiment 2

[0047] The preparation method of embodiment 2 freeze-dried lotus seeds

[0048] Follow the steps below:

[0049](1) Cooking: Remove the shells of fresh lotus seeds, wash them with running water, and then cook them to get cooked lotus seeds.

[0050] (2) Pre-freezing: first place the cooked lotus seeds at 4-5°C to keep the temperature of all lotus seeds at 4-5°C; then lower the temperature from 4-5°C to -35°C to -40°C, Keep it for 2-3 hours; after treatment, raise the temperature to -15°C to -18°C and keep it for 1 hour; then lower the temperature to -25°C to -35°C and keep it for 2 hours, and the pre-freezing is over.

[0051] (3) Sublimation: Control the plate temperature of the freeze dryer at 10-15°C, and maintain the temperature of the lotus seeds after pre-freezing at -15°C to -25°C for 18-20 hours; The temperature is controlled at 30%±5 of the saturated vapor pressure corresponding to the temperature of the lotus seeds, and the vacuum degree of the freeze-drying box is...

Embodiment 3

[0053] The preparation method of embodiment 3 freeze-dried lotus seeds

[0054] Follow the steps below:

[0055] (1) Cooking: Remove the shells of fresh lotus seeds, wash them with running water, and then cook them to get cooked lotus seeds.

[0056] (2) Pre-freezing: first place the cooked lotus seeds at 3-5°C to keep the temperature of all lotus seeds at 3-5°C; then lower the temperature from 3-5°C to -30°C to -35°C, Keep it for 2-3 hours; after treatment, raise the temperature to -10°C to -15°C and keep it for 0.5-1.5 hours; then lower the temperature to -20°C to -25°C and keep it for 2 hours, and the pre-freezing is over.

[0057] (3) Sublimation: Control the temperature of the freeze-dryer plate at 5-10°C, and maintain the temperature of the lotus seeds after pre-freezing at -10°C to -15°C for 20-22 hours; the vacuum of the freeze-drying box of the freeze-dryer The temperature is controlled at 30%±5 of the saturated vapor pressure corresponding to the temperature of the...

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Abstract

The invention belongs to the field of food processing, and especially relates to a lotus seed freeze-drying method. The method is characterized in that the lotus seeds are cooked, then the cooked lotus seeds are subjected to pre-refrigeration, and then is subjected to freeze drying. A pre-refrigeration step is characterized in that the cooked lotus seeds are placed at the temperature of 3-6 DEG C,the temperature of the lotus seeds is kept at the temperature of 3-6 DEG C, then the temperature is reduced from 3-6 DEG C to -30--40 DEG C, and the temperature is kept for 1-4 h, then the temperature is increased to -10 DEG C--18 DEG C, the temperature is kept for 0.5-1.5 h, then the temperature is reduced to -20--35 DEG C, and the temperature is kept for 1-3 h. A freeze drying step comprises two processes of sublimation and parse, and the residual moisture of the lotus seeds is 1-6%. The method has the advantages that the process is simple, no chemical substance is required, browning is notgenerated on the freeze-drying lotus seeds, the obtained freeze-drying lotus seeds keep a physical form of the fresh lotus seeds, and keep the drug effect of the lotus seeds.

Description

technical field [0001] The invention belongs to the field of food processing, in particular to a method for freeze-drying lotus seeds. Background technique [0002] Lotus seeds are the dry mature seeds of Nelumbo nucifera Gaertn. It has the effects of invigorating the spleen and stopping diarrhea, stopping the belt, nourishing the kidney and astringent essence, nourishing the heart and calming the nerves. Commonly used for diarrhea due to spleen deficiency, leukorrhagia, nocturnal emission, palpitation and insomnia. Most of them are distributed in the north and south provinces of my country. [0003] For a long time, lotus seeds were only sold as the first processed product—dried lotus. The traditional process of making dried lotus is to pick fresh lotus seeds and dry them in the sun. Because the technical parameters of the drying process cannot be mastered, the quality of the dried lotus produced is uneven. The main disadvantages are that the surface shrinks, and the re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23L3/44
Inventor 彭德光刘葵赵欣
Owner 重庆百农网投资有限公司
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