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    Profiling polyphenols in five Brassica species microgreens by UHPLC-PDA-ESI/HRMS(n.). Sun Jianghao,Xiao Zhenlei,Lin Long-Ze,Lester Gene E,Wang Qin,Harnly James M,Chen Pei Journal of agricultural and food chemistry Brassica vegetables are known to contain relatively high concentrations of bioactive compounds associated with human health. A comprehensive profiling of polyphenols from five Brassica species microgreens was conducted using ultrahigh-performance liquid chromatography photodiode array high-resolution multistage mass spectrometry (UHPLC-PDA-ESI/HRMS(n)). A total of 164 polyphenols including 30 anthocyanins, 105 flavonol glycosides, and 29 hydroxycinnamic acid and hydroxybenzoic acid derivatives were putatively identified.The putative identifications were based on UHPLC-HRMS(n) analysis using retention times, elution orders, UV-vis and high-resolution mass spectra, and an in-house polyphenol database as well as literature comparisons. This study showed that these five Brassica species microgreens could be considered as good sources of food polyphenols. 10.1021/jf401802n