Cocoa tea (Camellia ptilophylla Chang), a natural decaffeinated species of tea – Recommendations on the proper way of preparation for consumption |
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Authors: | Xiao-rong Yang Yuan-yuan Wang Kai-kai Li Jing Li Cheng-ren Li Xiang-gang Shi Chun-Hay Ko Ping-chung Leung Chuang-xing Ye Xiao-hong Song |
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Affiliation: | aDepartment of Biology, School of Life Sciences, Sun Yat-Sen University, Guangzhou, China;bInstitute of Chinese Medicine, The Chinese University of Hong Kong, Hong Kong, China;cState Key Laboratory of Photochemistry and Plant Resources in West China, The Chinese University of Hong Kong, Hong Kong, China |
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Abstract: | Cocoa tea is a new natural decaffeinated tea. Three types of cocoa tea (green, oolong and black) were produced and their sensory evaluation scores accessed. Main components and their dissolution rates in ten infusions of the three teas were analyzed by HPLC and spectrophotometry. The comprehensive score of sensory evaluations was 85.1, 86.8 and 94.4, respectively. Upon fermentation the contents of water extract (46.67%, 41.8% and 40%), tea polyphenols (38.58%, 30.41% and 23.6%) and total catechins (23.51%, 17.68% and 4.02%) in green, oolong and black teas decreased gradually, and theaflavins (0.11%, 0.11% and 0.17%), thearubigins (4.29%, 5.00% and 9.71%), theabrownins (2.75%, 4.90% and 13.52%), water-soluble carbohydrates, flavonoid glycoside and gallic acid in the three teas increased gradually. Theobromine (3.52%, 3.43% and 3.71%) was the alkaloid present in cocoa tea and its content did not change upon fermentation. In the three teas, 9–25% of the main components dissolved in the first 10 s-infusion, more than 80% of most components dissolved in five infusions. A recommendation for consuming cocoa tea is to infuse tea leaves (g) with 50 times boiling water (ml) for 3 min, the first infusion should not be discarded and five infusions were sufficient. |
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Keywords: | Abbreviations: WE water extract PO tea polyphenols TH theanine GA gallic acid TB theobromine TP theophylline GC (&minus )-gallocatechin CAF caffeine EGC (&minus )-epigallocatechin C (+)-catechin EC (&minus )-epicatechin EGCG (&minus )-epigallocatechin gallate GCG (&minus )-gallocatechin gallate ECG (&minus )-epicatechin gallate CG (&minus )-catechin gallate Tf theaflavins Tr thearubigins Tb theabrownins |
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