title: Recovery of dietary fiber and polyphenol from grape juice pomace and evaluation of their functional properties and polyphenol compositions.
abstract: The present work aimed at the recovery and characterization of dietary fiber and polyphenolic compounds extracted from red grape pomace, a by-product generated after grape fruit processing. High contents of total DF were found in the dietary fiber extracts (57.24%), whereas insoluble fiber was the major fraction (51.70%). And it showed good functional properties, including swelling capacity (4.01-8.32 mL g-1), water holding capacity (1.91-4.23 g g-1) and oil holding capacity (0.59-0.65 g g-1). After separation from the dietary fiber, phenolic extracts with high concentrations of total phenolic compounds and total flavonoids, showed high antioxidant activities, while the separated dietary fiber showed little antioxidant activities. This indicated that the phenolic composition is essential for the antioxidant activity of "antioxidant dietary fiber (ADF)". The identification of individual polyphenols was performed applying the HPLC-ESI-MS/MS technique and 31 compounds have been identified belonging to 4 groups, including anthocyanins, flavonols, flavan-3-ols and phenolic acids. Based on this study, we believe grape juice pomace could potentially be exploited as an inexpensive source of natural dietary fiber and phenolics and possibly used as a functional food ingredient.
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, People's Republic of China. chenyi-417@163.com.
authors.forename: LuLu
authors.initials: L
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, People's Republic of China. chenyi-417@163.com.
authors.forename: MengTing
authors.initials: M
authors.lastname: Zhu
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, People's Republic of China. chenyi-417@163.com.
authors.forename: Ting
authors.initials: T
authors.lastname: Shi
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, People's Republic of China. chenyi-417@163.com.
authors.forename: Cong
authors.initials: C
authors.lastname: Guo
authors.affiliation: JiangXi Institute of Analysis and Test, Nanchang 330029, People's Republic of China.
authors.forename: YouSheng
authors.initials: Y
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, People's Republic of China. chenyi-417@163.com.
authors.forename: Yi
authors.initials: Y
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, People's Republic of China. chenyi-417@163.com.
authors.forename: MingYong
authors.initials: M
authors.lastname: Xie
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification; D004043:Dietary Fiber / Q000032:analysis*; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification; D010936:Plant Extracts / Q000737:chemistry* / Q000302:isolation & purification*; D059808:Polyphenols / Q000737:chemistry* / Q000302:isolation & purification*; D027843:Vitis / Q000737:chemistry*; D014866:Waste Products / Q000032:analysis*
chemical_list: D000975:Antioxidants; D004043:Dietary Fiber; D005419:Flavonoids; D010636:Phenols; D010936:Plant Extracts; D059808:Polyphenols; D014866:Waste Products