title: Quality Degradation of Chinese White Lotus Seeds Caused by Dampening during Processing and Storage: Rapid and Nondestructive Discrimination Using Near-Infrared Spectroscopy.
abstract: Dampening during processing or storage can largely influence the quality of white lotus seeds (WLS). This paper investigated the feasibility of using near-infrared (NIR) spectroscopy and chemometrics for rapid and nondestructive discrimination of the dampened WLS. Regular (n = 167) and dampened (n = 118) WLS objects were collected from five main producing areas and NIR reflectance spectra (4000-12000 cm(-1)) were measured for bare kernels. The influence of spectral preprocessing methods, including smoothing, taking second-order derivatives (D2), and standard normal variate (SNV), on partial least squares discrimination analysis (PLSDA) was compared to select the optimal data preprocessing method. A moving-window strategy was combined with PLSDA (MWPLSDA) to select the most informative wavelength intervals for classification. Based on the selected spectral ranges, the sensitivity, specificity, and accuracy were 0.927, 0.950, and 0.937 for SNV-MWPLSDA, respectively.
authors.affiliation: College of Material and Chemical Engineering, Tongren University, Tongren, Guizhou 554300, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Xu
authors.affiliation: The Modernization Engineering Technology Research Center of Ethnic Minority Medicine of Hubei Province, College of Pharmacy, South-Central University for Nationalities, Wuhan 430074, China.
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Fu
authors.affiliation: College of Chemistry and Life Science, Chuxiong Normal University, Chuxiong 675000, China.
authors.forename: Chen-Bo
authors.initials: CB
authors.lastname: Cai
authors.affiliation: College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China.
authors.forename: Yuan-Bin
authors.initials: YB
authors.lastname: She