title: Principal component regression analysis of the relation between CIELAB color and monomeric anthocyanins in young Cabernet Sauvignon wines.
abstract: Color is one of the key characteristics used to evaluate the sensory quality of red wine, and anthocyanins are the main contributors to color. Monomeric anthocyanins and CIELAB color values were investigated by HPLC-MS and spectrophotometry during fermentation of Cabernet Sauvignon red wine, and principal component regression (PCR), a statistical tool, was used to establish a linkage between the detected anthocyanins and wine coloring. The results showed that 14 monomeric anthocyanins could be identified in wine samples, and all of these anthocyanins were negatively correlated with the L*, b* and H*ab values, but positively correlated with a* and C*ab values. On an equal concentration basis for each detected anthocyanin, cyanidin-3-O-glucoside (Cy3-glu) had the most influence on CIELAB color value, while malvidin 3-O-glucoside (Mv3-glu) had the least. The color values of various monomeric anthocyanins were influenced by their structures, substituents on the B-ring, acyl groups on the glucoside and the molecular steric structure. This work develops a statistical method for evaluating correlation between wine color and monomeric anthocyanins, and also provides a basis for elucidating the effect of intramolecular copigmentation on wine coloring.
authors.affiliation: Center for Viticulture and Enology, College of Food Science & Nutritional Engineering, China Agricultural University, Haidian District, Beijing, PR China. hfl109@yahoo.com.cn
authors.forename: Fu-Liang
authors.initials: FL
authors.lastname: Han
authors.forename: Wen-Na
authors.initials: WN
authors.lastname: Zhang
authors.forename: Qiu-Hong
authors.initials: QH
authors.lastname: Pan
authors.forename: Cheng-Rong
authors.initials: CR
authors.lastname: Zheng
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Chen
authors.forename: Chang-Qing
authors.initials: CQ
authors.lastname: Duan
mesh_terms: D000872:Anthocyanins / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D003116:Color; D005960:Glucosides / Q000737:chemistry; D015394:Molecular Structure; D025341:Principal Component Analysis / Q000379:methods*; D015203:Reproducibility of Results; D013053:Spectrophotometry / Q000379:methods; D014920:Wine / Q000032:analysis*
chemical_list: D000872:Anthocyanins; D005960:Glucosides; C462279:cyanidin-3-O-beta-glucopyranoside