Thermal emerging technology approach for the extraction of bioactive compounds from Cylindra beetroot (peel, flesh, and stalk) with green solvent

Abstract

With the benefits of high temperature and short time treatment, microwave irradiation has conquered novel extraction technology to valorize food wastes. In this study, the extraction processes of bioactive compounds from beetroot peel were accomplished by a home-use microwave oven following the central composite design performed by R statistical software. Aside from peel, stalk and flesh were utilized for bioactive compounds extraction as a comparison under three different processing conditions. Concerning the control (extracted conventionally), superior amounts of betalains, phenolics, flavonoids, and the relevant antioxidants were scavenged at 800 W of microwave power together with 150 s of extraction period following the descending order: peel, flesh, and stalk. Their respective extraction yield percentages are 9.14% (peel), 11.37% (stalk), and 14.99% (flesh). Ultimately, our observation is a prove of the high extraction efficiency of the pure water solvent. Novelty impact statement: Cylindra beetroot contains greater amounts of bioactive compounds in peel regarding its stalk and flesh parts. Extraction yield percentages were improved by two to three times with MAE.