title: Characterization of wheat varieties using terahertz time-domain spectroscopy.
abstract: Terahertz (THz) spectroscopy and multivariate data analysis were explored to discriminate eight wheat varieties. The absorption spectra were measured using THz time-domain spectroscopy from 0.2 to 2.0 THz. Using partial least squares (PLS), a regression model for discriminating wheat varieties was developed. The coefficient of correlation in cross validation (R) and root-mean-square error of cross validation (RMSECV) were 0.985 and 1.162, respectively. In addition, interval PLS was applied to optimize the models by selecting the most appropriate regions in the spectra, improving the prediction accuracy (R = 0.992 and RMSECV = 0.967). Results demonstrate that THz spectroscopy combined with multivariate analysis can provide rapid, nondestructive discrimination of wheat varieties.
authors.affiliation: State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China. gehongyi2004@163.com.|University of the Chinese Academy of Sciences, Beijing 100080, China. gehongyi2004@163.com.
authors.forename: Hongyi
authors.initials: H
authors.lastname: Ge
authors.affiliation: State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China. jiangyuying11@163.com.|University of the Chinese Academy of Sciences, Beijing 100080, China. jiangyuying11@163.com.
authors.forename: Yuying
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: Key Laboratory of Grain Information Processing & Control, Ministry of Education, Zhengzhou 450001, China. lfywork@163.com.
authors.forename: Feiyu
authors.initials: F
authors.lastname: Lian
authors.affiliation: Key Laboratory of Grain Information Processing & Control, Ministry of Education, Zhengzhou 450001, China. zhangyuan@haut.edu.cn.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100080, China. shxia@mail.ie.ac.cn.|University of the Chinese Academy of Sciences, Beijing 100080, China. shxia@mail.ie.ac.cn.
authors.forename: Shanhong
authors.initials: S
authors.lastname: Xia
mesh_terms: D002138:Calibration; D016018:Least-Squares Analysis; D015203:Reproducibility of Results; D055068:Terahertz Spectroscopy / Q000379:methods*; D014908:Triticum / Q000737:chemistry* / Q000145:classification*
keywords: absorption spectrum; interval partial least squares; terahertz time-domain spectroscopy; wheat varieties