Identification of Honeys and Syrups by Microwave Plasma Torch Mass Spectrometry / 分析化学

ABSTRACT

In this study, a method for rapid identification of three kinds of honey and four kinds of syrup by microwave plasma torch mass spectrometry ( MPT-MS) without sample pretreatment was established. Under the positive ion mode, honey and syrup were ionized by MPT-MS and analyzed by quadrupole mass spectrometry ( QMS). The MS data were analyzed with chemometrics methods. Consequently, principal component analysis ( PCA) showed that PC1, PC2 and PC3 had a total contribution rate of 91. 2％ , and cluster analysis (CA) indicated when the critical value was 7, this method could distinguish honey and syrup in addition to clover honey and inulin syrup. Partial least squares-discriminant analysis ( PLS-DA) also manifested that honey and syrup could be effectively distinguished. Discriminant analysis (DA) demonstrated that the discriminant accuracy of honey and syrup was 100％ . Accordingly, all the results showed that the method of MPT-MS combined with chemometrics could identify honey and syrup rapidly. In brief, this method has the advantages such as fast analysis speed, accurate information extraction, high recognition accuracy and without sample pretreatment, and can be used for the identification of honey and main adulterated syrup.