The Antidiabetic Effect of Grape Pomace Polysaccharide-Polyphenol Complexes

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Campos, F (Author) Other; Andreia Peixoto (Author) FCUP; Fernandes, PAR (Author) Other; Coimbra, MA (Author) Other; Nuno Mateus (Author) FCUP; Victor de Freitas (Author) FCUP; Iva Fernandes (Author) FCUP; Fernandes, A (Author) Other

Journal

Title: Nutrients

Final page: 4495

ISSN: 2072-6643

Publisher: MDPI

Indexing

ISI Web of Knowledge - 32 Citations

Scopus - 34 Citations

Other information

Authenticus ID: P-00V-VDT

DOI: 10.3390/nu13124495

Abstract (EN): Type 2 diabetes mellitus (T2DM) is one of the most prevalent chronic metabolic diseases of the 21st century. Nevertheless, its prevalence might be attenuated by taking advantage of bioactive compounds commonly found in fruits and vegetables. This work is focused on the recovery of polyphenols and polysaccharide-polyphenol conjugates from grape pomace for T2DM management and prevention. Bioactives were extracted by solid-liquid extraction and by pressurized hot water extraction (PHWE). Polyphenolic fraction recovered by PHWE showed the highest value for total phenolic content (427 mu g GAE.mg(-1)), mainly anthocyanins and proanthocyanidins, and higher antioxidant activity compared to the fraction recovered by solid-liquid extraction. Polysaccharide-polyphenol conjugates comprehended pectic polysaccharides to which approximately 108 mu g GAE of phenolic compounds (per mg fraction) were estimated to be bound. Polyphenols and polysaccharide-polyphenol conjugates exhibited distinct antidiabetic effects, depending on the extraction methodologies employed. Extracts were particularly relevant in the inhibition of a-glucosidase activity, with free polyphenols showing an IC50 of 0.47 mu g.mL(-1) while conjugates showed an IC50 of 2.7, 4.0 and 5.2 mu g.mL(-1) (solid-liquid extraction, PHWE at 95 and 120 degrees C, respectively). Antiglycation effect was more pronounced for free polyphenols recovered by PHWE, while the attenuation of glucose uptake by Caco-2 monolayers was more efficient for conjugates obtained by PHWE. The antidiabetic effect of grape pomace bioactives opens new opportunities for the exploitation of these agri-food wastes in food nutrition, the next step towards reaching a circular economy in grape products.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 18