title: Development of a Portable Field Imaging Spectrometer: Application for the Identification of Sun-Dried and Sulfur-Fumigated Chinese Herbals.
abstract: We fabricated a visible-near-infrared (Vis-NIR) portable field imaging spectrometer with a prism-grating-prism element and a scanning mirror. The developed Vis-NIR imaging spectrometer, consisting of an INFINITY 3-1 detector and a V10E spectrometer from Specim Corporation, is designed to measure the spectral range between 0.4 and 1 µm with spectral resolution of 2-4 nm. In recent years, sulfur fumigation has been abused during the processing of certain freshly harvested Chinese herbs. Fourier transform infrared spectroscopy, fiber optic NIR spectrometry, and liquid chromatography-mass spectrometry are typically used to analyze the chemical profiles of sulfur-fumigated and sun-dried Chinese herbs. Field imaging spectrometry is rarely used to identify sulfur-fumigated herbs. In this study, field imaging spectrometry, principal component analysis, and the partial least squares-discriminant analysis multivariate data analysis method are used to distinguish sun-dried and sulfur-fumigated Chinese medicinal herbs with a sensitivity of 96.4% and a specificity of 98.3% for RPA identification. These results suggest that hyperspectral imaging is a potential technique to control medicine quality for medical applications.
authors.affiliation: Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China.
authors.forename: Hongming
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China.
authors.forename: Taixia
authors.initials: T
authors.lastname: Wu
authors.affiliation: Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China zhanglf@radi.ac.cn.
authors.forename: Lifu
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
mesh_terms: D003890:Desiccation; D004365:Drugs, Chinese Herbal / Q000032:analysis*; D004867:Equipment Design; D005651:Fumigation; D016018:Least-Squares Analysis; D008904:Miniaturization / Q000295:instrumentation; D025341:Principal Component Analysis; D019265:Spectroscopy, Near-Infrared / Q000295:instrumentation*; D013455:Sulfur / Q000032:analysis*
chemical_list: D004365:Drugs, Chinese Herbal; D013455:Sulfur
keywords: Chinese herbal; Hyperspectral spectral imaging; PCA; PLS-DA; partial least squares-discriminant analysis; principal component analysis; sulfur-fumigated