Whey proteins-polyphenols interactions can be exploited to reduce astringency or increase solubility and stability of bioactives in foods. (March 2021)

• Record Type: Journal Article
• Authors: Jauregi, Paula; Guo, Yuchen; Adeloye, Jumoke B.
• Is Part Of: Food research international. Volume 141(2021)
• Publication Date: 2021-03
• Subjects: Resveratrol -- Solubility -- Isomerization -- Antioxidant activity -- Whey proteins -- Astringency -- Nanoparticles -- Nanocomplexation; Food -- Analysis -- Periodicals; Food industry and trade -- Periodicals; Food industry and trade -- Canada -- Periodicals; Food Technology -- Periodicals; Food -- Periodicals; Food-Processing Industry -- Periodicals; Aliments -- Industrie et commerce -- Périodiques; Aliments -- Industrie et commerce -- Canada -- Périodiques; Aliments -- Recherche -- Périodiques; Food industry and trade; Canada; Periodicals; Electronic journals; 664.005
• DOI: 10.1016/j.foodres.2020.110019
• Languages: English
• ISSNs: 0963-9969

Abstract

Graphical abstract: Highlights: β-Lg and β-Lg-CMP fractions were more effective than the hydrolysate in reducing astringency. β-Lg nanoparticles are stable to freeze drying. Resveratrol nanocomplexation with b-Lg nanoparticles increases its solubility and antioxidant activity. Abstract: Whey proteins have very interesting properties including, high solubility in water, strong interactions with polyphenols, aggregation properties and are classified as GRAS. Here the application of whey proteins to improve food formulations is evaluated. In particular, the reduction of astringency in wine by whey proteins and peptides was assessed applying an analytical method based on determination of tannins. As shown previously for β-lactoglobulin (β-Lg) and β-Lg-Caseinomacropeptides fractions, here it was shown that hydrolysates interacted with polymeric polyphenols such as tannins which, led to their complexation and precipitation effectively reducing astringency. In addition, nanoparticles of β-Lg and sweet whey were produced by applying a method developed previously in our group based on heat induced denaturation which could consistently produce nanoparticles of 200–300 nm with high colloidal stability. Here further characterisation of β-Lg nanoparticles showed that addition of ethanol up to 28% led to nanoparticles destabilisation mainly due to a reduction in β-Lg overall charge. The application of centrifugal force above 863 g led to the disruption of colloidal stability and β-Lg sedimentation. However, nanoparticles were stable to freeze drying conditions. Furthermore, it was shown that sweet whey could be used instead of β-Lg to produce nanoparticles of similar characteristics. These β-Lg nanoparticles formed nanocomplexes with resveratrol which, resulted in improved solubility and increased antioxidant activity under pasteurisation conditions. The isomerization from trans to cis and a protective effect of nanoparticles against some chemical changes that result in reduced activity could explain these results. Thus, whey proteins show promise in their application for improved formulations of food/beverages with bioactive ingredients.