Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1340, Issue -, Pages 146-150Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2014.03.030
Keywords
Cytokinins; Fe3O4 nanoparticles; Hydrophilic interaction; Magnetic solid-phase extraction; UPLC-MS/MS
Funding
- National Natural Science Foundation of China [91017013, 91217309, 21205091]
- Fundamental Research Funds for the Central Universities
- China Postdoctoral Science Foundation [2012M511653]
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A rapid method was developed for determination of endogenous cytokinins (CKs) based on magnetic solid-phase extraction (MSPE) followed by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). We illustrated the hydrophilic character of bare Fe3O4 nanoparticles that were directly used as a MSPE sorbent for rapid enrichment of endogenous CKs from complex plant extract. To the best of our knowledge, this is the first report of bare Fe3O4 directly used as efficient extraction sorbent to enrich target CKs based on hydrophilic interaction. Under the optimized conditions, a rapid, sensitive and high-throughput method for the determination of 16 CKs was established by combination of MSPE with UPLC-MS/MS. Good linearity was obtained with correlation coefficients (r) from 0.9902 to 0.9998. The limits of detection (LODs) and quantification (LOQs) ranged from 1.2 pg mL(-1) to 391.3 pg mL(-1) and 4.1 pg mL(-1) to 1304.3 pg mL(-1), respectively. 16 CKs could be successfully determined in spiked sample with 80.6-117.3% recoveries and the relative standard deviations (RSDs) were less than 16.6%. Finally, 10 endogenous CKs were successfully quantified in 50 mg Oryza sativa sample using the developed MSPE-UPLC-MS/MS method. (C) 2014 Elsevier B.V. All rights reserved.
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