Irreversible Sediment Formation in Green Tea Infusions

:  The formation of irreversible tea sediment (IRS) and its chemical components in green tea infusions were investigated. The results showed that the amounts of IRS in the green tea infusions from various tea cultivars ranged from 0.10 to 1.47 mg/mL. The amount of IRS was influenced remarkably by th...

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Published in:Journal of food science 2012-03, Vol.77 (3), p.C298-C302
Main Authors: Xu, Yong-Quan, Chen, Gen-Sheng, Wang, Qiu-Shuang, Yuan, Hai-Bo, Feng, Chun-Hong, Yin, Jun-Feng
Format: Article
Language:English
Subjects:
Amino Acids - analysis
Biological and medical sciences
Caffeine - analysis
Caffeine - chemistry
Catechin - analogs & derivatives
Catechin - analysis
Catechin - chemistry
chemical components
Chromatography, High Pressure Liquid
Coffee, tea and other stimulative beverage industries
Cultivars
Food industries
formation
Fundamental and applied biological sciences. Psychology
green tea infusion
Hot Temperature
IRS
Plant Leaves - chemistry
Polyphenols - analysis
Regression Analysis
Sediments
Tea
Tea - chemistry
Temperature
Trace Elements - analysis
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Summary::  The formation of irreversible tea sediment (IRS) and its chemical components in green tea infusions were investigated. The results showed that the amounts of IRS in the green tea infusions from various tea cultivars ranged from 0.10 to 1.47 mg/mL. The amount of IRS was influenced remarkably by the chemical components in the green tea infusion. Principal component analysis and regression analysis indicated that gallated catechins, Mn, Ca, caffeine, Na, and (−)‐gallocatechin gallate (GCG) were the principal components. IRS (mg/mL) =−4.226 + 0.275 gallated catechins + 79.551 Na + 7.321 Mn + 21.055 Ca + 0.513 caffeine − 0.129 GCG (R2= 0.697). The contents of the main chemical components in the reversible tea sediment (RTS) and IRS were markedly different, especially the minerals. Large amount of minerals participated in the formation of irreversible green tea sediment. The amount of IRS increased with the extraction temperature. Practical Application:  The results of this paper will help select the right tea cultivars, which have less RTS and IRS. This paper also helps understand the chemical components of IRS in green tea infusions and to find the right method to prevent its formation.
ISSN:0022-1147
1750-3841
DOI:10.1111/j.1750-3841.2011.02583.x