Abstract
The present investigation focuses on a possible alternative to reduce grape pomace’s negative impact on the environment by exploiting its capacities for wastewater remediation. Therefore, three directions are followed: (1) the characterization of white grape byproducts’ antioxidant and antiradical properties; (2) the determination of organophosphorus compound concentration that might be present in the samples; and (3) the evaluation of the possible use for wastewater remediation. The grape pomace was used for obtaining different extracts considering different extraction conditions. The hydroalcoholic extracts have an increased amount of total phenolic content. The lyophilized hydroalcoholic extract showed high total phenolic content (159.52 mg/100 g) and low organophosphorus content (0.257 ± 0.015 nmol). The lowest DPPH antiradical-scavenging activities were obtained for the extracts in ethanol obtained from refrigerated pomace (0.055) and for dried pomace (0.045).
Highlights
The applicability of the circular economy concept is gradually increasing
The values obtained for the total phenol content (TPC) are in good agreement with the ones reported by other authors when levels between 30 and 70 mg/g were reported [58,59,60,61]
Comparing the antioxidant activity obtained for the prepared samples, it can be observed that the presence of ethanol in the extraction process has a positive effect on the radical-scavenging activity, and the results obtained in the present paper are in good correlation with the previously reported values for the grape pomace
Summary
The applicability of the circular economy concept is gradually increasing. Agro-industrial wastes, for example, have important applications in bioremediation. Adsorbents obtained based on waste from tea leaves proved their efficiency in chelation chromium (VI) from polluted water [10]. Different nanoparticles, synthesized based on agro-wastes, have shown possibilities for use in wastewater remediation. The palladium nanostructures might remove toxic azo dyes from water and wastewaters [11]. The same concept was tested in other research for antibiotic removal [12]. Another direction linking agro-waste and possible wastewater toxics removal is the nanocomposites [13,14,15]
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