Antioxidant content and volatile composition of seedless table grape (Vitis vinifera L.) varieties

Abstract

Grapes are important sources of phenolics, which are recognized to possess high biological value. In this work, we evaluated the total phenol content (TPC), total anthocyanin content (TAC), antioxidant activity (AA) and volatile composition of unstudied seedless table grape varieties (i.e., Autumn Crisp and Pristine as white cultivars, Scarlotta and Crimson as red cultivars and Adora and Melody as black cultivars). As a result, Adora and Melody exhibited higher TPCs, TACs and AA, measured by the 2,2-diphenyl-2-picrylhydrazil (DPPH) and photochemiluminescence (PCL) assays, than the rest of the varieties. A comparison between the two black cultivars proved that Adora possessed higher TPC (62.70 mg GAE 100 g−1), DPPH radical scavenging activity (IC50 of 3.69 mg ml−1) and PCL antiradical activity (72.14 µg Trolox ml−1) than Melody (47.30 mg GAE 100 g−1, IC50 of 5.0 mg ml−1 and 42.36 µg Trolox ml−1, respectively). The volatile composition, determined by solid phase microextraction (SPME)–gas chromatography/mass spectrometry (GC/MS), indicated a similar qualitative aroma profile for all varieties. However, quantitative differences were measured among them, which were reflected in distinct sensory perception by sensorial testing. From these results, Adora was selected for its antioxidant properties and flavor characteristics.

Effect of nano zinc oxide coating on grape freshness and quality of its molasses

“…Apart from their sensory attributes, grapes are renowned for their antioxidant and antimicrobial qualities, primarily due to their high phenolic, anthocyanin, and ascorbic acid content. Grapes are considered a crucial source of bioactive compounds compared to other fruits and vegetables, making them an essential component of the human diet (Blanch et al 2023;Mohammadparast et al 2024).…”

“…Bioactive compounds, classi ed as non-nutrients, exhibit notable biological activity, particularly owing to their potent antimicrobial, antioxidant, metal chelating, and antiradical properties. Among the various biological effects associated with bioactive compounds, their antioxidant, and antimicrobial properties stand out as signi cant contributions to human health and well-being (Blanch et al 2023;Mangiapelo et al 2023).…”