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Lee KH, Chiang CK, Lin ZH, et al. Determining enediol compounds in tea using surface-assisted laser desorption/ionization mass spectrometry with titanium dioxide nanoparticle matrices. Rapid Commun Mass Spectrom. 2007;21(13):2023-30doi: 10.1002/rcm.3058.
Lee, K. H., Chiang, C. K., Lin, Z. H., & Chang, H. T. (2007). Determining enediol compounds in tea using surface-assisted laser desorption/ionization mass spectrometry with titanium dioxide nanoparticle matrices. Rapid communications in mass spectrometry : RCM, 21(13), 2023-30. https://doi.org/10.1002/rcm.3058
Lee, Kun-Hong, et al. "Determining enediol compounds in tea using surface-assisted laser desorption/ionization mass spectrometry with titanium dioxide nanoparticle matrices." Rapid communications in mass spectrometry : RCM vol. 21,13 (2007): 2023-30. doi: https://doi.org/10.1002/rcm.3058
Lee KH, Chiang CK, Lin ZH, Chang HT. Determining enediol compounds in tea using surface-assisted laser desorption/ionization mass spectrometry with titanium dioxide nanoparticle matrices. Rapid Commun Mass Spectrom. 2007;21(13):2023-30. doi: 10.1002/rcm.3058. PMID: 17534856.
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Rapid Commun Mass Spectrom. 2007;21(13):2023-30. doi: 10.1002/rcm.3058.

Determining enediol compounds in tea using surface-assisted laser desorption/ionization mass spectrometry with titanium dioxide nanoparticle matrices.

Rapid communications in mass spectrometry : RCM

Kun-Hong Lee, Cheng-Kang Chiang, Zong-Hong Lin, Huan-Tsung Chang

Affiliations

  1. Department of Chemistry, National Taiwan University, Taipei, Taiwan.

PMID: 17534856 DOI: 10.1002/rcm.3058

Abstract

We describe the use of titanium dioxide nanoparticles (TiO2 NPs) as selective probes and matrices for the determination of catechins using surface-assisted laser desorption/ionization mass spectrometry (SALDI-MS). The interactions between the enediol compounds and TiO2 NPs were evident by the change in color of the TiO2 NP solution from milky white to orange. Through these interactions, the TiO2 NPs could be used to concentrate enediol compounds, including catechins and ascorbic acid. The limits of detection (LODs) for three catechins--catechin, (-)-epigallocatechin, and (-)-epigallocatechin gallate--at a signal-to-noise ratio of 3 were 0.45, 1.85 and 0.65 microM, respectively. The TiO2 NP matrices provide a number of advantages over conventional organic matrices (e.g. 2',4',6'-trihydroxyacetophenone), including ease of sample preparation, less background noise in the low-mass region, and high repeatability. The applicability of this method was confirmed through the high reproducibility of the determination of the two catechins in tea samples that had not been subjected to any sample preparation procedures (shot-to-shot variation: <10%).

Copyright (c) 2007 John Wiley & Sons, Ltd.

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