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Rapid Determination of Green Tea Origins by Near-Infrared Spectroscopy and Multi-Wavelength Statistical Discriminant Analysis

  • X. G. ZhuangEmail author
  • X. S. Shi
  • H. F. Wang
  • L. L. Wang
  • J. X. Fang
Article

A new simple classification modeling procedure, multi-wavelength statistical discriminant analysis (MW-SDA), is proposed for the identification of Shandong green tea origins coupled with near-infrared (NIR) spectroscopy. After smoothing and first derivative preprocessing, seven characteristic wavelengths (CW) were selected by enlarging the detailed information of preprocessed spectra. Then, for each characteristic wavelength, a classification threshold is calculated according to the differences in absorbance value, which can best separate the spectra for different origins. Based on the seven CWs and corresponding thresholds, seven classifiers were obtained, which form the classification model. The performance of the calibration model was evaluated according to sensitivity, specificity, and classification accuracy. Analysis results indicated that MW-SDA can be used well to build classification models. The predicted precision of the last model in prediction set was: sensitivity = 1, specificity = 0.967, and accuracy = 98.3%.

Keywords

multi-wavelength statistical discriminant analysis NIR spectroscopy green tea origin 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • X. G. Zhuang
    • 1
    • 2
    Email author
  • X. S. Shi
    • 1
  • H. F. Wang
    • 1
  • L. L. Wang
    • 3
  • J. X. Fang
    • 3
  1. 1.The 41st Research Institute of CETCQingdaoChina
  2. 2.Science and Technology on Electronic Test and Measurement LaboratoryQingdaoChina
  3. 3.Advanced Research Center for OpticsShandong UniversityJinanChina

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