Chinese Journal of Chromatography ›› 2014, Vol. 32 ›› Issue (10): 1094-1103.DOI: 10.3724/SP.J.1123.2014.08010

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An automatic and sensitive method for the determination of endogenous brassinosteroids in plant tissues by an online trapping-in situ derivatization-ultra performance liquid chromatography-tandem mass spectrometry system

DING Jun1,2, JIANG Li1, FENG Yuqi1   

  1. 1. Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China;
    2. Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden of Chinese Academy of Sciences, Wuhan 430074, China
  • Received:2014-08-13 Online:2014-10-08 Published:2014-09-29

Abstract:

Brassinosteroids (BRs) are a class of naturally occurring phytohormones with polyhydroxy steroid structure, which regulate general plant growth and many physiological processes. The reported methods for BR analysis were complicated, and the detection sensitivity was relatively low. To realize the automatic analysis of trace BRs in limited plant tissues, an in-tube solid phase microextraction-ultra performance liquid chromatography-tandem mass spectrometry (SPME-UPLC-MS/MS) system was constructed based on two valves-two pumps. Using C18 PEEK column as the trapping column and 4-(dimethylamino)phenylboronic acid (4-DMAPBA) as the derivatization reagent, an on line trapping and in situ derivatization assay method of BRs was developed. BRs could be programmed to fulfill the procedures of injection, extraction, derivatization, LC separation and MS detection in the system. The detection limits of BRs were improved more than one order of magnitude by the online trapping and in situ derivatization techniques, thus endogenous BRs could be quantified in only 300 mg plant tissues.

Key words: brassinosteroid, in situ derivatization, online trapping, plant tissues, ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS)

CLC Number: