Effects of Drying Temperature on the Dissolving-out Properties of Polysaccharides in Dendrobium officinale Particles
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Abstract:
The objective of this work was to evaluate the effect of drying temperature on the dissolving-out ratio and the dissolving-out velocity of polysaccharides in D. officinal particles. The fresh D. officinal particles (5 mm in diameter×5 mm in length) as the raw material was used to prepare the dried D. officinal particles by hot-air-drying at different temperatures with the range of 60 to 140 ℃.Polysaccharides in the dried D. officinal particles were extracted by hot-water soaking at 60 ℃.The tissue structures of fresh and dried D. officinal particles were compared. The polysaccharide dissolving-out ratio and diffusion coefficient of fresh D. officinale particles were (46.65±0.86)% and 1.02×10-2 mm2/h, respectively. In the drying temperature range of 60 to 100 ℃, the dissolving-out of polysaccharides in dried D. officinale particles was promoted by drying. Low temperature is beneficial to the dissolving-out of polysaccharides. The polysaccharide dissolving-out ratio and diffusion coefficient of dried D. officinale particles prepared at 60 ℃ reached (64.54±1.27)% and 1.94×10-2 mm2/h, respectively. The low drying temperature was beneficial for D. officinale particles to maintaining the tissue structure, reducing shrinkage, mitigating Maillard reaction and caramelizing reaction, and producing certain internal voids, which promoted the dissolving-out of polysaccharides. This work provided technical data and theoretical basis for the drying and utilization of D. officinale.
