Robust and Automated Internal Quality Grading of a Chinese Green Tea (Longjing) by Near-Infrared Spectroscopy and Chemometrics
Joint Authors
Yu, Xiao-Ping
Fu, Xian-Shu
Cui, Hai-Feng
Xu, Lu
Ye, Zi-Hong
Source
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2013-03-28
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Abstract EN
Near-infrared (NIR) spectroscopy and chemometric methods were applied to internal quality control of a Chinese green tea, Longjing, with Protected Geographical Indication (PGI).
A total of 2745 authentic Longjing tea samples of three different grades were analyzed by NIR spectroscopy.
To remove the influence of abnormal samples, The Stahel-Donoho estimate (SDE) of outlyingness was used for outlier analysis.
Partial least squares discriminant analysis (PLSDA) was then used to classify the grades of tea based on NIR spectra.
Different data preprocessing methods, including smoothing, taking second-order derivative (D2) spectra, and standard normal variate (SNV) transformation, were performed to reduce unwanted spectral variations in samples of the same grade before classification models were developed.
The results demonstrate that smoothing, taking D2 spectra, and SNV can improve the performance of PLSDA models.
With SNV spectra, the model sensitivity was 1.000, 0.955, and 0.924, and the model specificity was 0.979, 0.952, and 0.996 for samples of three grades, respectively.
FT-NIR spectrometry and chemometrics can provide a robust and effective tool for rapid internal quality control of Longjing green tea.
American Psychological Association (APA)
Fu, Xian-Shu& Xu, Lu& Yu, Xiao-Ping& Ye, Zi-Hong& Cui, Hai-Feng. 2013. Robust and Automated Internal Quality Grading of a Chinese Green Tea (Longjing) by Near-Infrared Spectroscopy and Chemometrics. Journal of Spectroscopy،Vol. 2013, no. 2013, pp.1-7.
https://search.emarefa.net/detail/BIM-448852
Modern Language Association (MLA)
Fu, Xian-Shu…[et al.]. Robust and Automated Internal Quality Grading of a Chinese Green Tea (Longjing) by Near-Infrared Spectroscopy and Chemometrics. Journal of Spectroscopy No. 2013 (2013), pp.1-7.
https://search.emarefa.net/detail/BIM-448852
American Medical Association (AMA)
Fu, Xian-Shu& Xu, Lu& Yu, Xiao-Ping& Ye, Zi-Hong& Cui, Hai-Feng. Robust and Automated Internal Quality Grading of a Chinese Green Tea (Longjing) by Near-Infrared Spectroscopy and Chemometrics. Journal of Spectroscopy. 2013. Vol. 2013, no. 2013, pp.1-7.
https://search.emarefa.net/detail/BIM-448852
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-448852