EXTRACTION OF PECTIN FROM PEANUT SHELL WASTE WITH HEATING IN COMBINATION WITH ULTRASONIC-ASSISTED EXTRACTION

Abstract

The extraction of pectin from peanut shell waste with heating in combination with ultrasonic-assisted extraction (UAE) was studied. Powder of peanut shell was extracted at a temperature of 70, 80 and 90 °C for 2 hr. It was shown that the pectin extraction at 80 °C had the highest amount of pectin at 1.56±0.07 % compared to other treatments, and the chemical characteristics of the extracted pectin were similar to commercial pectin. Then, the pectin extraction condition at 80 °C for 2 hr was combined with UAE at 40kHz/1500W for 10, 20, and 30 min. Results shown that pectin extraction at 80 °C for 2 hr in combination with UAE at 40kHz/1500W for 10 min had the highest amount of extracted pectin at 1.61±0.04 % with 88.64± 2.69 % degree of esterification, 52.12±1.46 % galacturonic acid, 9.40 % moisture and 13.50 % ash which were the most similar properties to commercial pectin compared to other treatments. Therefore, pectin extraction with heating in combination with UAE method appeared to be an increasing pectin extraction when compared to the conventional method.