Full
Outline
To elucidate the aroma characteristics and regional differences of sun-dried green tea from different producing areas in Lancang County, Yunnan Province, and to establish an interpretable framework for aroma fingerprinting and geographical origin discrimination.
Volatile profiles of sun-dried green tea samples collected from 10 producing areas in Lancang County were systematically characterized by combining an electronic nose (E-nose) with gas chromatography-mass spectrometry (GC-MS).
Principal component analysis (PCA) of E-nose responses showed that sensors W1W, W2W and W3S contributed predominantly to PC1, whereas sensors such as W1S and W2S contributed more to PC2, indicating that alcohols, aldehydes/ketones, aromatic compounds and methyl-related substances were major drivers shaping the overall aroma profile. The ZB samples deviated markedly from the main cluster, which was likely attributable to the stronger responses of sensors W1W, W2W and W3S. GC-MS profiling revealed that alcohols, aldehydes and ketones dominated the volatile composition, and linalool together with β-ionone were identified as key contributors to aroma differentiation.Hierarchical clustering further indicated that DKH and BPDQ formed independent branches, reflecting their distinctive volatile signatures. Region-discriminating marker sets were identified: ZB samples were enriched in nerol and 2-cyclohexen-1-one, corresponding to an “orange blossom-grassy” note; XB samples uniquely contained cedrol and 1,2,3-trimethoxybenzene, consistent with a “Fresh green notes to soft woody sweetness” tone; MJ samples showed elevated phenylacetaldehyde, potentially contributing to a compound honey-like aroma characterized by“honey-ripe fruit with fresh citrus-woody notes”; DKH samples exhibited high linalool levels, presenting a pronounced “floral-citrus” profile; and BPDQ samples were dominated by 1-octen-3-ol, featuring base notes reminiscent of “mushroom, wet wood and mellow sweet ripe fruit”.
The integrated E-nose and GC-MS strategy enables rapid and effective discrimination of aroma characteristics and producing areas of sun-dried green tea with good interpretability, providing reliable physicochemical evidence for quality evaluation, origin authentication and geographical indication protection of sun-dried green tea from Lancang County.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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