Analysis of Aroma Fingerprint of Xihu Longjing Tea Using HS-SPME/GC-MS
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Abstract:
Xihu Longjing tea, one of the famous teas of China, has a long history and superior aroma quality, is and originally produced in Xihu district, Hangzhou city, Zhejiang Province. It is greatly favored by many consumers. The aroma components of 24 Xihu Longjing tea samples were investigated by solid phase micro-extraction gas chromatography-mass spectrometry (HS-SPME/GC-MS), and their GC-MS fingerprints were established. Optimal extraction for HS-SPME in this study was achieved with 50/30 μm CAR-DVB-PDMS fiber and extraction for 30 min with a water bath temperature of 60 ℃. In the GC-MS fingerprints established for the aroma components of Xihu Longjing tea, a total of 24 characteristic peaks were identified, and their peak areas accounted for 76.20% of the total peak area. The GC-MS fingerprints were analyzed by cosine and correlation coefficient methods, and a high similarity among different Xihu Longjing tea samples was observed. Cluster analysis demonstrated that Xihu Longjing tea samples with different grades could be grouped into one cluster. Thus, this method, which is based on GC-MS fingerprints combined with cluster analysis, can provide a scientific reference for aroma quality evaluation of Xihu Longjing tea.
