Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 498513
Title Effects of geographical origin, variety and farming system on the chemical markers and in vitro antioxidant capacity of Brazilian purple grape juices
Author(s) Margraf, Tiago; Santos, Érica Neulyana Taborda; Andrade, Eriel Forville de; Ruth, Saskia M. van; Granato, Daniel
Source Food Research International 82 (2016). - ISSN 0963-9969 - p. 145 - 155.
DOI http://dx.doi.org/10.1016/j.foodres.2016.02.003
Department(s) RIKILT - BU Authenticity & Nutrients
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Antioxidants - Chemometrics - Lipid peroxidation - Phenolic acids - Principal component analysis
Abstract

The effects of farming system, geographical origin, and grape variety on the in vitro antioxidant capacity, some physicochemical properties and chemical composition were investigated. Major and minor phenolic compounds, reducing and antioxidant assays using chemical and biological systems were determined in n = 62 100% purple grape Brazilian juices (Vitis labrusca L.) from organic and conventional systems from the three largest producing regions. Results were subjected to ANOVA, MANOVA, and principal component analysis. No distinction was observed between organic and conventional grape juices regarding the in vitro antioxidant/reducing capacities, but only through the analysis of individual phenolic acids. The geographical origin and grape variety played a more important role in distinguishing Brazilian grape juices according to the antioxidant activity and some chemical markers. MANOVA was applied and the combined effect of farming system and geographical origin was only significant for tonality (p = 0.044) and protocatechuic acid content (p = 0.030). Correlation analysis was performed and results showed that total phenolic content, total flavonoids, flavonols, anthocyanins, and condensed tannins were statistically associated (p <0.05) with FRAP, ABTS, and reducing potential of the hydrophilic phenolic compounds (RPHPC). Ascorbic acid did not seem to be involved in the antioxidant potential of the selected purple grape juices. Protocatechuic acid was statistically correlated to FRAP (r = 0.4636, p <0.001), ABTS (r = 0.3298, p = 0.010), and RPHPC (r = 0.3623, p = 0.004), while ferulic acid correlated with FRAP (r = 0.3410, p = 0.008) and RPHPC (r = 0.2662, p = 0.040). The inhibition of lipid peroxidation conducted at 37 °C in a biological system buffered at pH 7.4 was significantly (p <0.05) correlated to RPHPC (r = 0.533, p = 0.013) and to the scavenging activity toward ABTS radical (r = 0.505, p = 0.020). In addition, principal component analysis revealed that the inhibition of lipid peroxidation was associated with higher contents of total phenolic content, flavonoids, anthocyanins, flavonols, condensed tannins, and protocatechuic acid. Additionally, both spectrophotometric and chromatographic data regarding the phenolic composition seemed to be suitable approaches to differentiate Brazilian organic and conventionally-produced purple grape juices using PLS-DA as the classification efficiency in the calibration and validation steps were 78% and 75%, respectively.

Comments
There are no comments yet. You can post the first one!
Post a comment
 
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.