A new method to prepare and redefine black tea thearubigins

• Published in: Journal of Chromatography A Vol. 1563; pp. 82 - 88
• Main Authors: Wang, Weixin, Zhang, Shuwei, Lv, Lishuang, Sang, Shengmin
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 17.08.2018
• Subjects: Black tea; Caffeine precipitation; Catechin - analogs & derivatives; Catechin - analysis; Catechin - isolation & purification; Chromatography, High Pressure Liquid; Flavonoids; Flavonoids - analysis; Flavonoids - isolation & purification; Glycosides - analysis; Glycosides - isolation & purification; Plant Extracts - chemistry; Polyphenols - analysis; Polyphenols - isolation & purification; Sephadex LH-20 column; Tandem Mass Spectrometry; Tea - chemistry; Tea - metabolism; Thearubigins; Flavonoids; Sephadex LH-20 column; Caffeine precipitation; Black tea; Thearubigins
• ISSN: 0021-9673; 1873-3778
• DOI: 10.1016/j.chroma.2018.05.060

•Different factors on the preparation of crude thearubigins were investigated.•A new method was developed to prepare pure thearubigins.•The chemical profile of the floating peaks was established. Thearubigins (TRs) are the major components of black tea, which are formed during the fermentation reactions. Although anti-inflammatory and anti-cancer activities of TRs have been reported, the prepared TRs according to the literature methods still contain many floating peaks. It is puzzling whether the observed activities are from TRs or these floating peaks. Thus, it is urgent to develop a method to prepare pure TRs and redefine them. In the present study, we developed a new method, the combination of caffeine precipitation and Sephadex LH-20 column chromatography, to prepare pure TRs. The floating peaks on the hump of the crude TRs were removed, and pure TRs were prepared. The chemical profile of the floating peaks was established using LC/MS, and the major compounds in this fraction were identified as apigenin glycosides, quercetin glycosides, kaempferol glycosides, theaflavins, theasinensin, and galloylglucoses based on the analysis of their tandem mass spectra and in comparison with literature data. This study will pave the way to further study the chemistry and biological activities of TRs and the health effects of black tea consumption.