Journal
MOLECULES
Volume 25, Issue 24, Pages -Publisher
MDPI
DOI: 10.3390/molecules25246027
Keywords
citrus-tea; volatile components; HS-GC-IMS; HS-SPME-GC-MS; orthogonal partial least squares discrimination analysis; OAV
Funding
- Special Project for Construction of Innovative Hunan Province [2019NK2041]
- Training Program for Excellent Young Innovators of Changsha [KQ1905025]
- Agricultural Science and Technology Innovation Project of Hunan Province, China [2020CX47, 2020CX50]
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Citrus tea is an emerging tea drink produced from tea and the pericarp of citrus, which consumers have increasingly favored due to its potential health effects and unique flavor. This study aimed to simultaneously combine the characteristic volatile fingerprints with the odor activity values (OAVs) of different citrus teas for the first time by headspace gas chromatography-ion mobility spectrometry (HS-GC-IMS) and headspace solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS). Results showed that the establishment of a citrus tea flavor fingerprint based on HS-GC-IMS data can provide an effective means for the rapid identification and traceability of different citrus varieties. Moreover, 68 volatile compounds (OAV > 1) were identified by HS-SPME-GC-MS, which reflected the contribution of aroma compounds to the characteristic flavor of samples. Amongst them, the contribution of linalool with sweet flower fragrance was the highest. Odorants such as decanal, beta-lonone, beta-ionone, beta-myrcene and D-limonene also contributed significantly to all samples. According to principal component analysis, the samples from different citrus teas were significantly separated. Visualization analysis based on Pearson correlation coefficients suggested that the correlation between key compounds was clarified. A comprehensive evaluation of the aroma of citrus tea will guide citrus tea flavor quality control and mass production.
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