Analysis of commercial grape raisins: phenolic content, antioxidant capacity and radical scavenger activity

  1. Susana Sério 1
  2. Ana Cristina Correia 1
  3. António Manuel Jordão 1
  4. Maria D. Rivero-Pérez 2
  5. Maria L. González-San José 2
  1. 1 Polytechnic Institute of Viseu (Centre for the Study of Education, Technologies and Health), (Portugal)
  2. 2 University of Burgos (Spain)
Journal:
Ciência e técnica vitivinícola

ISSN: 0254-0223

Year of publication: 2014

Volume: 29

Issue: 1

Pages: 1-8

Type: Article

DOI: 10.1051/CTV/20142901001 DIALNET GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Ciência e técnica vitivinícola

Abstract

Seven different commercial grape raisins from the Spanish market were evaluated for total phenolic composition, antioxidant potential and scavenger activity. Commercial red raisins (from the Cardinal grape variety) generally had the significantly highest content of total phenolic compounds (406.9 mg/100 g raisin) and antioxidant capacity (27.88 mM Fe(II) and 10.73 mM trolox, respectively by applying FRAP and ABTS methods) while commercial white raisins had the lowest content for the parameters analyzed, especially for commercial Moscatel of Alexandria and Sultana raisins (ranging from 110.8 to 284.4 mg/100 g raisin for total phenolic compounds and ranging from 6.0 to 17.04 mM Fe(II) and from 2.43 to 8.94 mM trolox, respectively for antioxidant capacity by applying FRAP and ABTS methods). Finally, the Pearson test shows a very high correlation (0.95 and 0.97, α<0.05) between total phenolic content and antioxidant capacity. Results prove that all commercial raisin samples studied constitute a natural source of polyphenols and antioxidants, especially raisin samples obtained from the red grape variety.

Data source: Dialnet