title: Effect of simulated processing on the antioxidant capacity and in vitro protein digestion of fruit juice-milk beverage model systems.
abstract: The effects of simulated processing (pH adjustment and thermal treatment) on the antioxidant capacity and in vitro protein digestion of fruit juice-milk beverage (FJMB) models consisting of whey protein (WP), and chlorogenic acid (CHA) or catechin (CAT) were investigated. Results indicated that CAT was more susceptible to processing than CHA, and showed a significant (p < 0.05) decrease in ABTS and FRAP after sterilization (121°C/10 min) and pH adjustment to 6.8. WP addition had different effects (none, masking, synergetic effect) on the antioxidant activity of FJMB. Pasteurization (63°C/30 min) and pH adjustment (pH 3.7 or pH 6.8) had either non-significant or slight effects on FJMB's antioxidant capacity, while sterilization significantly (p<0.05) increased or decreased its ABTS and FRAP depending on the different models. In vitro digestion of WP in FJMB was obviously (p < 0.05) inhibited by phenolics to varying degrees, and little influenced (p>0.05) by pasteurization, whereas sterilization initially accelerated WP digestion but did not change its overall digestibility.
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China. Electronic address: zyhe@jiangnan.edu.cn.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: He
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China.
authors.forename: Bo
authors.initials: B
authors.lastname: Yuan
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China.
authors.forename: Maomao
authors.initials: M
authors.lastname: Zeng
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China.
authors.forename: Guanjun
authors.initials: G
authors.lastname: Tao
authors.affiliation: State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China; Synergetic Innovation Center of Food Safety and Nutrition, Jiangnan University, Wuxi, Jiangsu 214122, PR China.
authors.forename: Jie
authors.initials: J
authors.lastname: Chen
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000032:analysis; D001628:Beverages / Q000032:analysis*; D002417:Cattle; D005511:Food Handling; D005638:Fruit / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D008892:Milk / Q000737:chemistry*; D061352:Pasteurization; D059748:Proteolysis
chemical_list: D000975:Antioxidants
keywords: Antioxidant capacity; Fruit juice-milk beverage; In vitro digestion; Thermal processing; pH adjustment