Stability of microemulsions containing red grape pomace extract obtained with a glycerol/sodium benzoate deep eutectic solvent

The valorization of red grape pomace is significant as one the most cultivated fruits worldwide and generated by-product quantities are enormous. For this purpose, numerous encapsulation techniques have been developed. However, studies on microemulsions composed with deep eutectic solvent extracts very limited. In study, extract (RGPE) was first prepared by extraction characterized HPLC analysis. Rutin, quercetin, catechin caftaric acid were identified main non-pigment phenolic compounds. RGPE further encapsulated in (MEs) following a low-energy approach using mixture low molecular weight surfactants, pseudo-ternary phase diagram constructed. physical antioxidant stability MEs containing 3–15 wt% investigated for period 30 days. stable at an ambient temperature 25 or 37 °C. radical scavenging activity improved up to 13% compared free extract. Our results indicate that provide protection valuable constituents especially under elevated conditions can therefore be used systems applications nutraceuticals cosmetics.