Rapid and direct identification of the origin of white tea with proton transfer reaction time-of-flight mass spectrometry.,Rapid Communications in Mass Spectrometry

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Rapid and direct identification of the origin of white tea with proton transfer reaction time-of-flight mass spectrometry.
Rapid Communications in Mass Spectrometry ( IF 2 ) Pub Date : 2020-05-15 , DOI: 10.1002/rcm.8830
Dandan Zhang _{1,

2} , Weihua Wu ₃ , Xiaohong Qiu ₄ , Xiaojing Li ₅ , Feng Zhao ₆ , Naixing Ye ₁

Affiliation

RATIONALE White tea has become very popular in recent years, but there has been no scientific identification of white tea from different origins. For product authentication and valorization, every kind of white tea must be marked with an indication of its origin. METHODS Volatile profiles of white tea leaf samples from their main origins in China (Fuding City, Zhenghe County, and Jianyang City) were analyzed by proton transfer reaction-time of flight-mass spectrometry (PTR-TOF-MS). Tentative identifications of the volatile organic compounds (VOCs) were obtained by PTR-TOF-MS of the headspace. Principal component analysis (PCA) and orthogonal partial least squares discriminant analysis (OPLS-DA) were performed to evaluate the differences among the different origins. RESULTS Teas from different origins were shown to have characteristic VOCs and profiles. Thus, white teas from different origins could be separated by characterizing the volatile emissions from the dry tea leaves. The ability of the two classification models to use the volatile fingerprints in origin discrimination was investigated. CONCLUSIONS Two classification models (PCA and OPLS-DA) were applied to the PTR-TOF-MS data obtained from the VOCs obtained from different white teas. The classification models were shown to be useful in identifying the origin of white tea samples, providing a reference for white tea identification.

更新日期：2020-05-15

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