Ultrasound-Assisted Extraction of Bioactive Compounds and Antioxidants from Carrot Pomace: A Response Surface Approach

Abstract

The phenolic compounds from carrot pomace were extracted using ultrasound-assisted extraction (UAE). A three-factor and three-level central composite design was used to evaluate the effects of the operation parameters, including extraction time (3–37 min), extraction temperature (10–60C) and ethanol concentration (13–97%) on the extraction yields of total phenols, antioxidant capacity, chlorogenic acid, caffeic acid, catechin and epicatechin. UAE optimal conditions for total phenols, total antioxidant capacity and phenolic compounds were achieved using response surface methodology. The results revealed that independent variables significantly affected the extraction yields of all the responses. A good correlation between experimental and predicted values (P > 0.05) under optimal extraction conditions suggests that the UAE is a more efficient process for the extraction of bioactive compounds from the carrot pomace. Practical Applications Ultrasound-assisted extraction of phenolic compounds from carrot pomace may successfully be employed in the industrial development because it is an eco-friendly and a time-saving process for the preparation of natural antioxidants and in turn may increase the antioxidant potential of the extracts of agro-industrial waste products of the food processing industries.