title: Tea classification and quality assessment using laser-induced fluorescence and chemometric evaluation.
abstract: Laser-induced fluorescence was used to evaluate the classification and quality of Chinese oolong teas and jasmine teas. The fluorescence of four different types of Chinese oolong teas-Guangdong oolong, North Fujian oolong, South Fujian oolong, and Taiwan oolong was recorded and singular value decomposition was used to describe the autofluoresence of the tea samples. Linear discriminant analysis was used to train a predictive chemometric model and a leave-one-out methodology was used to classify the types and evaluate the quality of the tea samples. The predicted classification of the oolong teas and the grade of the jasmine teas were estimated using this method. The agreement between the grades evaluated by the tea experts and by the chemometric model shows the potential of this technique to be used for practical assessment of tea grades.
authors.affiliation: Centre for Optical and Electromagnetic Research, Zhejiang University, Hangzhou 310058, China. meiliang@coer.zju.edu.cn
authors.forename: Liang
authors.initials: L
authors.lastname: Mei
authors.forename: Patrik
authors.initials: P
authors.lastname: Lundin
authors.forename: Mikkel
authors.initials: M
authors.lastname: Brydegaard
authors.forename: Shuying
authors.initials: S
authors.lastname: Gong
authors.forename: Desong
authors.initials: D
authors.lastname: Tang
authors.forename: Gabriel
authors.initials: G
authors.lastname: Somesfalean
authors.forename: Sailing
authors.initials: S
authors.lastname: He
authors.forename: Sune
authors.initials: S
authors.lastname: Svanberg
mesh_terms: D005453:Fluorescence; D007834:Lasers; D008962:Models, Theoretical; D011786:Quality Control; D013662:Tea / Q000737:chemistry* / Q000145:classification
chemical_list: D013662:Tea