Grape juice by-products extracted by ultrasound and microwave-assisted with different solvents: a rich chemical composition

  • Vania Pezzini
  • Fabiana Agostini
  • Franco Smiderle
  • Luciana Touguinha
  • Mirian Salvador
  • Sidnei MouraEmail author


By-products of the grape juice industry contain valuable compounds. The current work produced bioactive-enriched extracts from by-products of the grape juice, through three different extraction methods. Yields and chemical compositions varied, according to the extraction method (ultrasound, microwave, liquid–liquid). High-efficiency liquid chromatography with UV–Vis and high-resolution mass spectrometry characterised were used for chemical characterization, with glycosylated flavonoids evident. The crude extract was fractionated by open column, which has possibility carried-out fraction rich in resveratrol. The inhibition of DPPH radicals ranged from 14.2 to 74.2%, and the total phenolic content ranged from 0.1 to 107.0 mg gallic acid equivalents/100 g. Microwave-assisted extraction of grape juice by-products using polar solvents, such as ethanol and water, provided the best yield and chemical composition, obtaining extracts rich in flavonoids. In this way, this work has demonstrated the industrial grape by-products importances, which are a rich source of antioxidants if properly extracted.


Grape Industrial by-products Extraction HPLC-UV HRMS Flavonoids 



The authors are grateful to Poggere Winery for kindly providing the grape juices by-products and to CAPES, CNPq and FAPERGS for the financial support.

Compliance with ethical standards

Conflict of interest

All authors declared that they have no conflict of interest.


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Copyright information

© The Korean Society of Food Science and Technology 2018

Authors and Affiliations

  1. 1.LBIOP – Laboratory of Biotechnology of Natural and Synthetics Products, Technology DepartmentBiotechnology Institute, University of Caxias do SulCaxias do SulBrazil
  2. 2.LEOA – Laboratory of Oxidative Stress and AntioxidantsBiotechnology Institute, University of Caxias do SulCaxias do SulBrazil

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