title: Predicting the anthocyanin content of wine grapes by NIR hyperspectral imaging.
abstract: The aim of this study was to demonstrate the capability of hyperspectral imaging in predicting anthocyanin content changes in wine grapes during ripening. One hundred twenty groups of Cabernet Sauvignon grapes were collected periodically after veraison. The hyperspectral images were recorded by a hyperspectral imaging system with a spectral range from 900 to 1700 nm. The anthocyanin content was measured by the pH differential method. A quantitative model was developed using partial least squares regression (PLSR) or support vector regression (SVR) for calculating the anthocyanin content. The best model was obtained using SVR, yielding a coefficient of validation (P-R(2)) of 0.9414 and a root mean square error of prediction (RMSEP) of 0.0046, higher than the PLSR model, which had a P-R(2) of 0.8407 and a RMSEP of 0.0129. Therefore, hyperspectral imaging can be a fast and non-destructive method for predicting the anthocyanin content of wine grapes during ripening.
authors.affiliation: College of Information Engineering, Northwest A&F University, Yangling 712100, China.
authors.forename: Shanshan
authors.initials: S
authors.lastname: Chen
authors.affiliation: College of Enology, Northwest A&F University, Yangling 712100, China.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Zhang
authors.affiliation: College of Information Engineering, Northwest A&F University, Yangling 712100, China. Electronic address: jf_ning@sina.com.
authors.forename: Jifeng
authors.initials: J
authors.lastname: Ning
authors.affiliation: College of Enology, Northwest A&F University, Yangling 712100, China. Electronic address: liuxu@nwsuaf.edu.cn.
authors.forename: Xu
authors.initials: X
authors.lastname: Liu
authors.affiliation: College of Enology, Northwest A&F University, Yangling 712100, China.
authors.forename: Zhenwen
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling 712100, China.
authors.forename: Shuqin
authors.initials: S
authors.lastname: Yang
mesh_terms: D000872:Anthocyanins / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D016018:Least-Squares Analysis; D008962:Models, Theoretical; D019265:Spectroscopy, Near-Infrared / Q000379:methods; D027843:Vitis / Q000737:chemistry*; D014920:Wine / Q000032:analysis*
chemical_list: D000872:Anthocyanins
keywords: Anthocyanins; Near-infrared hyperspectral imaging; Partial least squares regression; Support vector regression; Wine grapes