Investigation of isomeric transformations of chlorogenic acid in buffers and biological matrixes by ultra-performance liquid chromatography coupled with hybrid quadrupole/ion mobility/orthogonal acceleration time-of-flight mass spectrometry - Xie, C; Yu, K; Zhong, D; Yuan, T; Ye, F; Jarrell, J A; Millar, A; Chen, X (J Agric Food Chem, 2011)