Multivariate analysis for1H-NMR spectra of two hundred kinds of tea in the world

Masako Fujiwara, Itiro Ando, Kazunori Arifuku

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


NMR measurements coupled with pattern-recognition analysis offer a powerful mixture-analysis tool for latent-feature extraction and sample classification. As fundamental applications of this analysis for mixtures, the 1H spectra of 176 kinds of green, black, oolong and other tea infusions were acquired by a 500 MHz NMR spectrometer. Each spectrum pattern was analyzed by a multivariate statistical pattern-recognition method where Principal Component Analysis (PCA) was used in combination with Soft Independent Modeling of Class Analogy (SIMCA). SIMCA effectively selected variables that contribute to tea categorization. The final PCA resulted in clear classification reflecting the fermentation and processing of each tea, and revealed marker variables that include catechin and theanine peaks. 2006

Original languageEnglish
Pages (from-to)1307-1314
Number of pages8
Journalanalytical sciences
Issue number10
Publication statusPublished - 2006 Oct
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry


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