Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.chroma.2006.08.027
Title: Analysis of cytokinin nucleotides in coconut (Cocos nucifera L.) water using capillary zone electrophoresis-tandem mass spectrometry after solid-phase extraction
Authors: Ge, L.
Yong, J.W.H.
Tan, S.N.
Yang, X.H.
Ong, E.S. 
Keywords: Capillary zone electrophoresis
Coconut water
Cytokinin nucleotide
Solid-phase extraction
Tandem mass spectrometry
Issue Date: 2006
Citation: Ge, L., Yong, J.W.H., Tan, S.N., Yang, X.H., Ong, E.S. (2006). Analysis of cytokinin nucleotides in coconut (Cocos nucifera L.) water using capillary zone electrophoresis-tandem mass spectrometry after solid-phase extraction. Journal of Chromatography A 1133 (1-2) : 322-331. ScholarBank@NUS Repository. https://doi.org/10.1016/j.chroma.2006.08.027
Abstract: A method based on solid-phase extraction (SPE) and capillary zone electrophoresis-tandem mass spectrometry (CZE-MS/MS) is described for the separation and determination of six cytokinin nucleotides in coconut water. The best CZE separation for the six cytokinin nucleotide standards was achieved using a 25 mM ammonium formate/formic acid buffer (pH 3.8) and 2% (v/v) methanol with an applied gradient separation voltage (25 kV for 32 min, and then a linear gradient to 30 kV in 5 min, finally 30 kV to the end of separation) in less than 60 min. MS/MS with multiple reaction monitoring (MRM) detection was carried out to obtain sufficient selectivity and sensitivity for the cytokinin nucleotides. The combined use of on-line sample stacking and CZE-MS/MS achieved limits of detection (LODs) in the range of 0.06-0.19 μM for the six cytokinin nucleotides at a signal-to-noise ratio of 3. Furthermore, a novel dual-step SPE procedure was developed for the pre-concentration and purification of cytokinin nucleotides using Oasis HLB and Oasis MAX cartridges. The recoveries of the cytokinin nucleotides after the dual-step SPE were in the range of 44-71%. The combination of off-line SPE, on-line sample stacking and CZE-MS/MS approach was successfully applied to screen for endogenous cytokinin nucleotides present in coconut water sample. trans-Zeatin riboside-5′-monophosphate (ZMP) was detected and quantified in coconut water by CZE-MS/MS after SPE and on-line sample stacking. © 2006 Elsevier B.V. All rights reserved.
Source Title: Journal of Chromatography A
URI: http://scholarbank.nus.edu.sg/handle/10635/24455
ISSN: 00219673
DOI: 10.1016/j.chroma.2006.08.027
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