Preparation method for freeze-dried Chinese yam superfine micro-powder

Abstract

The invention provides a preparation method for freeze-dried Chinese yam superfine micro-powder. The preparation method comprises the following steps: selecting materials and washing; peeling off and slicing; lyophilizing; crushing to obtain superfine micro-powder and sealing and packaging; after selecting the materials and washing, pre-cooling Chinese yams; then peeling off and slicing, wherein the pre-cooling temperature of the pre-cooling step ranges from-27 DEG C to -30 DEG C and the pre-cooling time of the pre-cooling step lasts for 3h; the slicing thickness in the step of peeling off and slicing is 3-5mm; the temperature in the lyophilizing step ranges from -35 DEG C to -45 DEG C; the water content of the lyophilized materials is less than or equal to 3%; the step of crushing to obtain the superfine micro-powder adopts a vibration type superfine micro-powder crusher to crush the materials; the temperature of the materials is controlled to -10 DEG C in the crushing process. According to the preparation method for the freeze-dried Chinese yam superfine micro-powder provided by the invention, immersion by adopting color-protecting solution and enzyme deactivation are not needed and the loss of heat-sensitive components of the prepared Chinese yam micro-powder is small; the loss of nutrition ingredients of the raw materials is little, the reconstitution property is good and the medical value is high.

Description

technical field [0001] The invention relates to a production method of freeze-dried food ultrafine powder, in particular to a production method of freeze-dried Chinese yam as a raw material of ultrafine powder. Background technique [0002] Huai yam is a perennial winding herbaceous vine, which is the tuber of the yam plant Dioscorea in the Dioscoreaceae family. It is a precious medicinal material with the same origin as medicine and food. There is a monograph in "Compendium of Materia Medica" written by Li Shizhen, a medical scientist in Ming Dynasty: nature, sweet, warm and flat. If you take it for a long time, you can hear and see well, and you can live lightly without hunger and prolong life. "Shen Nong's Materia Medica" states that it is "flat in nature, sweet in taste, nourishing the spleen and stomach, benefiting the lungs and kidneys, promoting body fluid and quenching thirst, benefiting kidney qi, stopping diarrhea and dysentery, reducing phlegm and saliva, and moi...