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Objective To investigate the effects of aging time on the volatile flavor components of soy sauce. Methods Differences in volatile aroma components between black bean soy sauce and soybean meal soy sauce aged at different times were analyzed using electronic nose combined with headspace-solid phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS), and key aroma components were identified using odor activity value (OAV) method. Results A total of 1227 kinds of volatile substances were detected in 6 kinds of soy sauce samples with different aging times, mainly including 265 kinds of esters, 155 kinds of terpenes, 153 kinds of ketones, 137 kinds of heterocyclic compounds, 104 kinds of alcohols, 77 kinds of acids, 72 kinds of aldehydes, 59 kinds of phenols, 54 kinds of hydrocarbons, 50 kinds of amines, 30 kinds of aromatic hydrocarbons, 27 kinds of ethers, 26 kinds of nitrogen-containing compounds, 9 kinds of sulfur-containing compounds, and 9 kinds of halogenated hydrocarbons. With the increase of aging time, the types and relative content of volatile compounds in black bean soy sauce and soybean bean soy sauce showed significant differences (P<0.05), and the key aroma components contribute significantly to the overall flavor characteristics. Electronic nose technology could effectively distinguish the volatile aroma characteristics of soy sauce with different aging times, and was consistent with the trend of changes in volatile flavor compounds. A total of 132 kinds of key aroma components (OAV>1) were identified through OAV, among which aldehydes, phenols, and terpenes contributed the most to the overall aroma of soy sauce. Conclusion This study reveals the influence of different aging times on the volatile components and aroma quality of black bean soy sauce and soybean meal soy sauce, providing theoretical and experimental references for the improvement of soy sauce and flavor quality.
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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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