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A kind of method for freeze-drying lotus seeds

A lotus seed and freeze-drying technology, which is applied in the field of food processing, can solve the problems of harm to the human body, and achieve the effect of smooth surface, retention of medicinal effect, and no defect in appearance

Active Publication Date: 2021-08-03
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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  • A kind of method for freeze-drying lotus seeds

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, in particular to a method for freeze-drying lotus seeds. The method is to cook the lotus seeds first, and freeze-dry the cooked lotus seeds after pre-freezing. The pre-freezing is to place the cooked lotus seeds at 3-6°C, keep the temperature of all the lotus seeds at 3-6°C, and then lower the temperature from 3-6°C to -30°C to -40°C, keep 1-4 hours, then increase the temperature to -10°C to -18°C, hold for 0.5-1.5 hours, then reduce the temperature to -20°C to -35°C, hold for 1-3 hours. The freeze-drying includes two steps of sublimation and analysis, finally making the residual moisture of the lotus seeds 1-6%. The invention provides a method for freeze-drying lotus seeds. The method is simple to operate, does not need to add chemical substances, and can keep freeze-dried lotus seeds without browning. Moreover, the freeze-dried lotus seeds obtained by the method maintain the physical form of fresh lotus seeds and retain Medicinal effects of 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 Patents(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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