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Determining Enediol Compounds in Tea Using Surface-assisted Laser Desorption/ionization Mass Spectrometry with Titanium Dioxide Nanoparticle Matrices by Kun-Hong Lee; Cheng-Kang Chiang; Zong-Hong Lin; Huan-Tsung Chang is a Chemistry article available to read on EtoBox.

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## Abstract We describe the use of titanium dioxide nanoparticles (TiO~2~ 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 TiO~2~ NPs were evident by the change in color of the TiO~2~ NP solution from milky white to orange. Through these interactions, the TiO~2~ 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 μM, respectively. The TiO~2~ 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 © 2007 John Wi

Who reads Determining Enediol Compounds in Tea Using Surface-assisted Laser Desorption/ionization Mass Spectrometry with Titanium Dioxide Nanoparticle Matrices?

Author

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

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0951-4198)

Published

2007

Language

EN

Field

Chemistry (Physical Sciences)