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Characterization of Volatile Compounds in Four Different Rhododendron Flowers by GC×GC-QTOFMS

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Guangdong Provincial Key Laboratory of Emergency Test for Dangerous Chemicals/Guangdong Engineering and Technology Research Center for Ambient Mass Spectrometry, Guangdong Institute of Analysis, Guangzhou 510070, China
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Guizhou Provincial Key Laboratory of Mountainous Environmental Protection, Guizhou Normal University, Guiyang 550001, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Igor Jerković
Molecules 2019, 24(18), 3327; https://doi.org/10.3390/molecules24183327
Received: 14 August 2019 / Revised: 9 September 2019 / Accepted: 11 September 2019 / Published: 12 September 2019
(This article belongs to the Special Issue Progress in Volatile Organic Compounds Research)
Volatile compounds in flowers of Rhododendron delavayi, R. agastum, R. annae, and R. irroratum were analyzed using comprehensive two-dimensional gas chromatography-mass spectrometry (GC×GC) coupled with high-resolution quadrupole time-of-flight mass spectrometry (QTOFMS). A significantly increased number of compounds was separated by GC×GC compared to conventional one-dimensional GC (1DGC), allowing more comprehensive understanding of the volatile composition of Rhododendron flowers. In total, 129 volatile compounds were detected and quantified. Among them, hexanal, limonene, benzeneacetaldehyde, 2-nonen-1-ol, phenylethyl alcohol, citronellal, isopulegol, 3,5-dimethoxytoluene, and pyridine are the main compounds with different content levels in all flower samples. 1,2,3-trimethoxy-5-methyl-benzene exhibits significantly higher content in R. irroratum compared to in the other three species, while isopulegol is only found in R. irroratum and R. agastum. View Full-Text
Keywords: Rhododendron flowers; volatile compounds; comprehensive two-dimensional gas chromatography-mass spectrometry; quadrupole time-of-flight mass spectrometry; odor description Rhododendron flowers; volatile compounds; comprehensive two-dimensional gas chromatography-mass spectrometry; quadrupole time-of-flight mass spectrometry; odor description
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MDPI and ACS Style

Qian, C.-Y.; Quan, W.-X.; Xiang, Z.-M.; Li, C.-C. Characterization of Volatile Compounds in Four Different Rhododendron Flowers by GC×GC-QTOFMS. Molecules 2019, 24, 3327.

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