Analysis of Aromatic Compounds in Three Types of Tea Dhools Scented with Osmanthus Using HS-SPME-GC-MS
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Abstract:
To investigate the aroma differences of three types of tea dhools scented with osmanthus, headspace solid-phase microextraction-gas chromatography-mass spectrometry (HS-SPME-GC-MS), sensory evaluation, and odor activity values (OAV) were used to analyze the aromatic compounds of osmanthus black tea, osmanthus beauty tea, and osmanthus oolong tea. A total of 726 common aromatic compounds and 324 differential aromatic compounds were detected in the three types of osmanthus teas (P<0.05). Osmanthus tea is mainly composed of heterocyclic compounds, terpenoids, esters, hydrocarbons, and ketones, accounting for 78.73% of the total compounds. The key aromatic compounds (OAV>10) in osmanthus tea include furaneol, α-ionone, linalool, citral, hotrienol, and 1-dodecanol. The key aromatic compounds of osmanthus black tea were found to be linalool, β-myrcene, α-ionone, β-ionone, linalyl acetate, benzyl alcohol, and 1-dodecanol, whereas those of osmanthus beauty tea include phenylacetaldehyde, citral, hotrienol, linalool, terpinene, α-ionone, and β-ionone. Lastly, the key aroma components of osmanthus oolong tea were found to be α-ionone, indole, β-ionone, and 1-dodecenal. This study shows that osmanthus scenting can significantly improve the aroma of different tea dhools and give them a rich and long-lasting osmanthus fragrance. The quality of osmanthus black tea was observed to be the best.
