Search

[Display omitted] • The microfluidic-based SNP genotyping chip was applied for rapid varietal authentication of oolong tea products. • Untargeted authentication of oolong tea products from different origins was feasible. • Forty-four oolong tea product samples were identified as 4 tea varieties with an identification efficiency of 97.78% based on a combined NJ tree and PCoA plot analysis. • Forty-eight SNP loci were selected for commercial authentication of Minnan oolong tea products with less time and low cost. Oolong tea is one of the most popular Chinese teas, and its quality is significantly affected by the variety of tea plant. The growing demands lead to the adulteration of premium oolong tea products, e.g., Tieguanyin oolong tea. In this study, microfluidic technology and single-nucleotide polymorphism (SNP) biomarkers were used to authenticate the varieties of oolong tea products. Forty-eight pairs of primers were screened, and they can be used to authenticate Tieguanyin oolong tea via high-throughput microfluidic SNP chips. Through the combination of the NJ tree and PCoA plot methods, the study found that the most frequent adulterant of Tieguanyin oolong tea on the market is Benshan. For the first time, the commercial behavior of using Fuyun6 and Jinguanyin as adulterants or contamination in the production of Tieguanyin oolong tea was reported. This research has proposed rapid authentication technology for oolong tea to provide food quality supervision and promote consumer trust. [ABSTRACT FROM AUTHOR]