title: An innovative grape juice enriched in polyphenols by microwave-assisted extraction.
abstract: The grape juice by-product obtained from grape traditional press was extracted by Microwave Hydrodiffusion and Gravity (MHG); a green extraction technique preliminarily optimized at 1 W/g. The MHG extract (MHGE) was analyzed by HPLC for identification and quantification of anthocyanins and other phenolic compounds. Then, MHGE was added to the natural juice (NJ) to produce an innovative grape juice (IJ). These three juices were evaluated for their total polyphenol content (TPC), total anthocyanin content (TAC) in addition to their sensorial characteristics. MHGE showed the highest values of TPC (21.41±0.04 mg GAE/g DW), TAC (4.49±0.01 μg MVGE/g DW). Moreover, IJ (grape juice enriched with MHGE) was richer in TPC (6.70±0.0 1mg GAE/g DW) and TAC (3.96±0.01 μg MVGE/g DW) than NJ (2.90±0.02 mg GAE/g DW and 3.63±0.06 μg MVGE/g DW, respectively).
authors.affiliation: Université d'Avignon et des Pays de Vaucluse, INRA, UMR408, 84000 Avignon, France.
authors.forename: Sheiraz
authors.initials: S
authors.lastname: Al Bittar
authors.forename: Sandrine
authors.initials: S
authors.lastname: Périno-Issartier
authors.forename: Olivier
authors.initials: O
authors.lastname: Dangles
authors.forename: Farid
authors.initials: F
authors.lastname: Chemat
mesh_terms: D001628:Beverages / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid; D055772:Green Chemistry Technology / Q000295:instrumentation / Q000379:methods*; D008872:Microwaves; D010936:Plant Extracts / Q000032:analysis / Q000302:isolation & purification*; D059808:Polyphenols / Q000032:analysis / Q000302:isolation & purification*; D027843:Vitis / Q000737:chemistry*
chemical_list: D010936:Plant Extracts; D059808:Polyphenols
keywords: Anthocyanins; By-product; Enriched juice; Grape; Microwave hydro-diffusion and gravity; Total phenol content