Microwave vacuum freeze-drying method for rhizoma gastrodiae

Abstract

The invention discloses a microwave vacuum freeze-drying method for rhizoma gastrodiae. The microwave vacuum freeze-drying method comprises the following steps: firstly, cleaning and draining fresh rhizoma gastrodiae; secondly, pre-freezing the rhizoma gastrodiae at the temperature of 10 DEG C below zero to 30 DEG C below zero for 1 hour to 1 year; thirdly, slicing and pricking the rhizoma gastrodiae obtained in the second step; fourthly, putting the pricked rhizoma gastrodiae into a microwave freezing dryer, and freezing at the pressure of 5 to 20 Pa and the temperature of 35 DEG C below zero to 40 DEG C below zero for 1 to 3 hours; introducing nitrogen, controlling the pressure at 20 to 100 Pa, controlling microwave power at 100 to 300 w / kg when the time reaches 0 to 3 hours, controlling the microwave power at 300 to 500 w / kg when the time reaches 3 to 6 hours, controlling the microwave power at 100 to 200 w / kg when the time reaches 6 to 8 hours, and warehousing to obtain freeze-dried rhizoma gastrodiae slices. The method disclosed by the invention has the advantages of short production period and low energy consumption and cost for freeze drying; in addition, effective ingredients, nutritional ingredients, appearance, color and luster of the fresh rhizoma gastrodiae are sufficiently protected from being damaged, original shapes of crude products are maintained, and the rhizoma gastrodiae slices are crisp and tasty in mouthfeel.

Description

technical field [0001] The invention relates to a drying method of Gastrodia elata, in particular to a microwave vacuum freeze-drying method of Gastrodia elata. Background technique [0002] Gastrodia elata is a famous and precious traditional Chinese medicine commonly used by doctors in ancient and modern times. It has a clinical application history of more than 2,000 years. Li Shizhen of the Ming Dynasty recorded in "Compendium of Materia Medica" that Gastrodia elata has the effect of "replenishing qi for a long time, lightening the body for a long time". In the "National Chinese Herbal Medicine Compilation", the efficacy of Gastrodia elata is summarized as follows: "Indications for high blood pressure, dizziness, headache, crooked mouth and eyes, numbness of limbs, convulsions in children and other diseases." From the perspective of modern medicine, what effects does Gastrodia elata have on the human body? There is still a lot of uncharted territory. Gastrodia elata is ...

AI Technical Summary

Problems solved by technology

In some methods, before freeze-drying, Gastrodia elata is steamed and boiled to kill enzymes. Since steaming and boiling need to be carried out at a high temperature of 90°C to 100°C, it causes the loss of active ingredients such as gastrodin and p-hydroxybenzyl alcohol and the appearance of them. destroy

[0006] Gastrodia elata harvesting period is generally from October to March of the following year. Fresh gastrodia elata is particularly perishable after being harvested from the ground (usually it starts to rot within a few days), and the active ingredients will also be stored for a long time and will be lost. In many cases, it is necessary to transport fresh Gastrodia elata to remote factories for drying, drying, freeze-drying and other drying treatments. During the long-distance transportation, it is easy to be damaged and rotted. As a result, the processing of Gastrodia elata can only be done in a certain area and for a certain period of time. If it is completed within a short period of time, it will greatly limit the development of the entire Gastrodia elata industry.

Due to the difficulty in transportation and storage of fresh Gastrodia elata, and the limitation of purchasing season, the scope of use of Gastrodia elata is limited

[0007] In the prior art, fresh Gastrodia elata is sliced ​​directly, and a lot of mucus will flow out on the surface. The conventional method is to wash it with water, sterile lemonade and other solutions, or if it is not cleaned, the appearance and color will be uneven, which will increase the difficulty of drying operation and cause mutual pollution.

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