Characterization of key volatile compounds in jasmine tea infusion with different amount of flowers

Highlights

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  Tea infusion was suitable to be extracted for 5 min with 1:25 tea/water ratio.

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  Two hundred and four volatiles were identified in jasmine tea infusion.

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  Twenty-five key volatile compounds of jasmine tea infusion were identified.

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  Most key volatile compounds were positively correlated with amount of flowers.

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  Jasmine tea that were scented with 80 % flower is good for quality and cost.

Abstract

The quality of jasmine tea is related to the volatiles of its infusion. In this study, the volatiles of jasmine tea infusion were extracted under the optimal conditions with a 50/30 μm DVB/CAR/PDMS fiber, tea/water ratio of 1:25 and extraction time of 5 min. A total of 204 volatiles were analyzed by comprehensive two-dimensional gas chromatography-quadrupole time-of-flight mass spectrometry (GC × GC-Q-TOF-MS). Twenty-five compounds were identified as the key volatile compounds by fold change (FC), orthogonal partial least squares discriminant analysis (OPLS-DA), and two-way orthogonal partial least squares analysis (O2PLS). Then optimal amount of flowers (80%–120%) was obtained by the equation describing key volatiles and quality of jasmine tea infusion. And 80% amount of flowers was more appropriate considering the production cost and more pleasant taste. This study laid a foundation for the extraction and research of volatiles of tea infusion and guided the reasonable amount of flowers to produce jasmine tea.