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Journal of Tea Science ›› 2025, Vol. 45 ›› Issue (5): 821-840.

• Research Paper • Previous Articles     Next Articles

Study on Comprehensive Optimization of the Extraction Process and Emulsion Loading System of Water-extracted Polysaccharides from Qingzhuan Tea and Alkali-extracted Polysaccharides from Tea Residue

GUO Yu1, XIAO Liuyu2, DU Qiuyi2, TIAN Ye3, HAN Yu2,*   

  1. 1. School of Life and Health Sciences, Hubei University of Technology, Wuhan 430068, China;
    2. Plant Functional Components Utilization Engineering Technology Research Center, Hubei University of Engineering, Xiaogan 432000, China;
    3. Wuhan University of Bioengineering, Wuhan 431400, China
  • Received:2024-10-08 Revised:2024-11-29 Online:2025-10-15 Published:2025-10-17

Abstract: Qingzhuan tea is a regional iconic product of Hubei Province. This study used Hubei-specific, pile-fermented (unpressed) Qingzhuan tea as a sample to optimize the water and alkali extraction processes via response surface methodology. The study then compared the physicochemical properties of two tea polysaccharides (TPS) and clarified their emulsion stability and loading effect over 10 days of storage. The results show that the optimal conditions for water extraction were 60 ℃, 367 W of ultrasonic power, a solid-to-liquid ratio of 1:40 and an extraction rate of (5.019±0.130)%. The optimal conditions for alkali extraction from the water-extracted tea residue were 85 ℃, a solid-to-liquid ratio of 1:40, pH 9.0 and an extraction rate of (1.101±0.034)%. The molecular weight, free radical scavenging rate for antioxidant activity, monosaccharide content, particle size, zeta potential, emulsion stability and loading capacity of water extracted TPS were higher than those of alkali-extracted TPS. TPS emulsions show good stability during the storage period of 10 days, and has a broad application prospect as a load material.

Key words: Qingzhuan tea, polysaccharide, extraction, response surface method, emulsion load

CLC Number: