Chen-Hui Chen, Yi Yang, Jia-Ping Ke, Zi Yang, Jia-Yi Li, Yu-Xing Zhang, Guangjin Liu, Zhijun Liu, Guangmin Yao, Guan-Hu Bao
Novel N -ethy-2-pyrrolidinone-substituted flavonols, myricetin alkaloids A-C ( 1 - 3 ), quercetin alkaloids A-C ( 4a , 4b , and 5 ), and kaempferol alkaloids A and B ( 6 and 7 ), were prepared from thermal reaction products of myricetin, quercetin, kaempferol─l-theanine, respectively. We used HPLC-ESI-HRMS/MS to detect 1 - 7 in 14 cultivars of green tea and found that they were all present in "Shuchazao," "Longjing 43", "Fudingdabai", and "Zhongcha 108" green teas. The structures of 1 - 4 and 6 were determined by extensive 1D and 2D NMR spectroscopies...
February 7, 2024: Journal of Agricultural and Food Chemistry