Method for drying gastrodia elata at variable temperatures

Abstract

The invention discloses a method for drying gastrodia elata at variable temperatures, and belongs to the technical field of primarily processing medicinal plants. By the aid of the method, the drying time can be shortened, and the gastrodin contents can be increased. The method includes steps of steaming the fresh gastrodia elata; cooling the steamed gastrodia elata at the room temperatures; preliminarily freezing the gastrodia elata; carrying out vacuum freeze-drying on the gastrodia elata to obtain dried gastrodia elata. Compared with the traditional process for carrying out vacuum freeze-drying on gastrodia elata, the method has the advantages that the fresh gastrodia elata is steamed and cooked before being preliminarily frozen, accordingly, transformation and synthesis of gastrodin can be accelerated by the aid of the method, and the gastrodin contents of the dried gastrodia elata can be 1.75 times the gastrodin contents of directly frozen and dried gastrodia elata; the integrity of gastrodia elata cells is destroyed in steaming procedures, free water and partial combined water are easy to diffuse to the outsides of the cells and tissue spaces, accordingly, the duration for drying the gastrodia elata by the aid of the method can be saved by 5 hours at least as compared with a process for directly carrying out vacuum freeze-drying on fresh gastrodia elata, and energy sources can be saved; the original appearance of the fresh gastrodia elata dried by the aid of the method can be kept, the gastrodia elata is good in rehydration capacity, easy to smash and long in shelf life, and the method is high in operability and easy to popularize.

Description

technical field [0001] The invention discloses a vacuum freeze-drying method capable of shortening drying time and increasing gastrodin content, belonging to the technical field of primary processing of medicinal plants. Background technique [0002] Gastrodia elata, also known as Chijian, is a plant of the genus Gastrodia elata in the family Orchidaceae ( Gastrodiaelata B.) dried tuber is a commonly used and relatively expensive traditional Chinese medicine. It is mostly used clinically for convulsions in children, epilepsy, convulsions, tetanus, headaches, dizziness, paralysis of limbs, numbness of limbs, and rheumatic arthralgia. [0003] The traditional drying method of Gastrodia elata is sunlight or drying, and the processors use sulfur fumigation for antiseptic and neat appearance, which brings great safety hazards to Gastrodia elata medicinal materials. In addition, ordinary dried Gastrodia elata is hard and thick, and the dried roots of Gastrodia elata purchased by ...

AI Technical Summary

Problems solved by technology

However, in the process of processing, the analysis temperature is raised to above 80°C. Although this can speed up the drying speed, it will easily lead to the deformation of Gastrodia elata and the reduction of rehydration.

There are also some scholars who boiled Gastrodia elata before freeze-drying and cooling it in cold water. Because gastrodin and Gastrodia elata polysaccharides are water-soluble, it will cause the loss of effective medicinal components of Gastrodia elata and reduce the quality of Gastrodia elata.

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