title: A method for producing superfine black tea powder with enhanced infusion and dispersion property.
abstract: Tea is rich in healthy components including polyphenols, caffeine, gallic acids, and others. Current technology of tea infusion and extraction leads to more than 40% soluble solids wasted in spent leaf. To increase the bioaccessibility of black tea, we report a method of pulverization treatments including general and superfine grinding to reduce the particle size. In comparison with coarsely ground black tea powders (BTPs), the superfine ground BTP with medium diameter 6.9μm resulted in significant higher infusion yield of total polyphenols (TPP), caffeine, and water-soluble carbohydrate (WSC). The total water-soluble solids (WSS) of superfine BTP infusion increased markedly by twice due to the accelerated diffusion and enhanced solubility. High correlation between particle size and sedimentation ratio suggested improved dispersion stability of superfine BTP. The optimal dispersion of 0.1% superfine BTP in water was obtained by combination of homogenization and 0.08% CMC-Na formulation with 27.05% centrifugal sedimentation ratio.
authors: College of Engineering, China Agricultural University, Box 191, Beijing 100083, PR China.
authors: Weihua
authors: W
authors: Xiao
authors: College of Engineering, China Agricultural University, Box 191, Beijing 100083, PR China.
authors: Yang
authors: Y
authors: Zhang
authors: College of Engineering, China Agricultural University, Box 191, Beijing 100083, PR China.
authors: Chongxin
authors: C
authors: Fan
authors: College of Engineering, China Agricultural University, Box 191, Beijing 100083, PR China. Electronic address: hanlj@cau.edu.cn.
authors: Lujia
authors: L
authors: Han
mesh_terms: D002110:Caffeine / Q000032:analysis; D028241:Camellia sinensis; D002626:Chemistry, Pharmaceutical; D005707:Gallic Acid / Q000032:analysis; D010316:Particle Size; D018515:Plant Leaves / Q000737:chemistry*; D059808:Polyphenols / Q000032:analysis; D011208:Powders; D012995:Solubility; D013662:Tea / Q000737:chemistry*
chemical_list: D059808:Polyphenols; D011208:Powders; D013662:Tea; D002110:Caffeine; D005707:Gallic Acid
keywords: Black tea powder; Dispersion; Infusion; Particle size; Superfine grinding