Microwave vacuum freeze-drying method for Dendrobium officinale

Abstract

The invention discloses a microwave vacuum freeze-drying method of dendrobium candidum, which comprises the following steps: (1) pretreatment: washing the dendrobium candidum, draining the surface moisture, fumigation with steam for 3-5 minutes, and cooling to room temperature; (2) Pre-freezing and freezing: putting the pretreated Dendrobium candidum into a freezer with a storage temperature of -32~-36°C to quickly cool down the Dendrobium candidum to the storage temperature within 30 minutes, and then freeze at the constant temperature for 3 hours at the storage temperature; ( 3) Sublimation: put the frozen Dendrobium candidum in a vacuum chamber with a temperature of -40~-45°C and a vacuum degree of 13-30Pa, and turn on the microwave generator to sublimate at a modulation power of 200~250W / Kg for 1~2h (4) Post-processing: the dried Dendrobium candidum is classified, packaged and sealed. The drying method of the dendrobium candidum of the present invention has the advantages of fast drying speed, short time, low energy consumption, maximum retention of active substances of the dendrobium candidum, sufficient drying and the like.

Description

technical field [0001] The invention relates to a processing method of Chinese herbal medicine, in particular to a microwave vacuum freeze-drying method of dendrobium officinale. Background technique [0002] Dendrobium candidum, also known as black knot grass, belongs to the aerial orchidaceae herb. It is called "the giant panda in the medicine world" in the international medicinal plant circle, and is called "life-saving fairy grass" by the people. According to medical records, Dendrobium candidum has medicinal value such as nourishing yin and body, strengthening the body, nourishing the spleen and stomach, protecting the liver and gallbladder, strengthening muscles and bones, promoting circulation, lowering blood sugar, inhibiting tumors, brightening eyes, nourishing skin, and prolonging life, such as: "Chinese Pharmacy Dictionary" said that it "specializes in nourishing the qi and liquid of the lung and stomach, the qi and liquid are prosperous, and the kidney water is s...

AI Technical Summary

Problems solved by technology

The fresh product of Dendrobium officinale has a short storage time, and although it can prolong the storage time after drying, the sensory indicators become worse, and most importantly, the effective physiologically active ingredients are also affected, resulting in a decline in its efficacy

At present, the existing patent number (CN102178847A) discloses a vacuum freeze-drying method to dry Dendrobium candidum, but in the sublimation stage, it uses a heating plate to provide slight heat for the sublimation of Dendrobium candidum moisture, and there are uneven heating of Dendrobium candidum and denaturation of surface substances. , Disadvantages of black color