title: Optimization of polyphenol extraction from red grape pomace using aqueous glycerol/tartaric acid mixtures and response surface methodology.
abstract: Grape pomace is a food industry waste containing a high burden of antioxidant polyphenols and several methodologies have been developed for their efficient extraction. However, a sustainable and environmentally friendly process should involve recovery means composed of benign, non-toxic solvents, such as tartaric acid and glycerol, which are natural food constituents. In this line, this study examined the extraction of polyphenols using aqueous tartaric acid/glycerol solutions. The aim was to assess the role of acid and glycerol concentration in the extraction yield, employing a Box-Behnken experimental design and response surface methodology. The results showed that solutions containing only glycerol (20%, w/v) are more suitable for retrieving polyphenols, flavonoids, and pigments from grape pomace, while tartaric acid exerted a negative effect in this regard, when tested at concentrations up to 2% (w/v).
authors: a School of Environment , University of the Aegean , Myrina , Lemnos , Greece.
authors: Dimitris P
authors: DP
authors: Makris
authors: a School of Environment , University of the Aegean , Myrina , Lemnos , Greece.
authors: Vassiliki
authors: V
authors: Passalidi
authors: b Department of Food Science & Human Nutrition , Agricultural University of Athens , Athens , Greece.
authors: Stamatina
authors: S
authors: Kallithraka
authors: c Faculty of Agriculture, Forestry & Natural Environment , Aristotle University of Thessaloniki , Thessaloniki , Greece.
authors: Ioannis
authors: I
authors: Mourtzinos
mesh_terms: D001671:Biochemistry / Q000379:methods*; D005525:Food-Processing Industry; D005990:Glycerol / Q000737:chemistry; D059808:Polyphenols / Q000302:isolation & purification*; D012997:Solvents / Q000737:chemistry; D013644:Tartrates / Q000737:chemistry; D027843:Vitis / Q000737:chemistry*; D014866:Waste Products
chemical_list: D059808:Polyphenols; D012997:Solvents; D013644:Tartrates; D014866:Waste Products; D005990:Glycerol; C029768:tartaric acid
keywords: Antioxidants; extraction; glycerol; polyphenols; red grape pomace; tartaric acid