Green Tea Quality Evaluation Based on Its Catechins and Metals Composition in Combination with Chemometric Analysis

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Wojciech KochKazimierz Głowniak

Abstract

Green tea infusions are one of the most popular beverages consumed across the world, especially is Asian countries. Green tea quality is primarily based on catechin content, however, the concentration of elements could also significantly influence its biological properties and thus quality and safety. The main purpose of the present study was the evaluation of catechin, antioxidant activity and metal content (K, Na, Ca, Mg, Fe, Mn, Cu, Zn, Cr, Pb, Cd and Ni) in different green tea types cultivated in Japan, Sri Lanka, South Korea, India, China and Japan. The chemical analysis of samples was performed using LC-ESI-Q-TOF-MS for organic constituents and atomic absorption spectrometry (flame and electrothermal) method for inorganic ones. The obtained results were subjected to chemometric elaboration. EGC (213 mg/100 mL of the tea infusion in South Korean Jeoncha) and EGCG (124 mg/100 mL in Japanese Sencha) were the dominant catechins in all green tea samples. Chinese and Indian green tea samples contained the highest concentration of toxic heavy metals, however these values were far below appropriate limitations for green teas. PCA revealed significant similarities between Japanese samples and Korean Jeoncha. In general the latter ...Continue Reading

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Citations

May 18, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Nenad NaumovskiDemosthenes Panagiotakos
Nov 28, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Wojciech KochWirginia Kukula-Koch
Jun 7, 2020·Nutrients·Bartosz MalinowskiMichał Wiciński
Aug 15, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Tao TongSeong-Gook Kang
May 10, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Wojciech KochEwelina Gumbarewicz
Sep 16, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Zhuo-Yu CaiYue-Rong Liang
Mar 8, 2020·International Journal of Molecular Sciences·Claudia MusialMagdalena Gorska-Ponikowska
Sep 1, 2019·Comprehensive Reviews in Food Science and Food Safety·Liang ZhangDaniel Granato
Nov 17, 2020·Frontiers in Immunology·Pritom Chowdhury, Anoop Kumar Barooah
Jun 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Miao TianYi Chen
Jul 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Anchalee RawangkanSurasak Saokaew
Aug 24, 2021·Frontiers in Nutrition·Moses C WambulwaFrancis N Wachira

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Methods Mentioned

BETA
PCA

Software Mentioned

Windows
GNU R environment
Matcha

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