Nonvolatile metabolite alterations during Zijuan black tea processing affect the protective potential on HOECs exposed to nicotine

TF-3′-G, TF-3-G, phenylalanine, and kaempferol-3-coumaroylglucoside, formed during black tea processing, were closely associated with the alleviation of Zijuan black tea for nicotine-induced oxidative stress and inflammation in human oral epithelial cells.