期刊
FOOD CHEMISTRY
卷 214, 期 -, 页码 242-247出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2016.07.096
关键词
Black tea powder; Superfine grinding; Particle size; Infusion; Dispersion
资金
- National Natural Science Foundation of China [31271611]
- Research Fund for the Doctoral Program of Higher Education of China [20130008130004]
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 6.9 mu m 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. (C) 2016 Elsevier Ltd. All rights reserved.
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