Optimization of green extraction of anthocyanins from purple passion fruit peels by response surface methodology

This study describes the extraction of anthocyanins from purple passion fruit peels by ultrasonic cell grinder extraction (UCGE) technology, where water was selected as the solvent. Extraction conditions were further optimized by response surface methodology, and the details were as follows: a solution-to-solid ratio of 25:1 mL/g, an extraction power of 780 W, a buffer time of 2.3 s, and an extraction time of 50 min. The yield of the UCGE was higher than that of a conventional solvent extraction. The result indicated that this technique was a green, economic, and efficient method. Practical applications Purple passion fruit peel, as a waste material, can currently be used as an anthocyanin source. Ultrasonic cell grinder extraction (UCGE) is one green extraction technology that has been successfully applied to extract active ingredients in the food industry. Response surface methodology (RSM) can reduce the number of experiments and optimize complex systems and therefore has been widely used in various research fields. In this study, we have developed the method of UCGE of anthocyanins from peels by RSM. The result provides useful information for the potential industrial application of this extraction method to purple passion fruit peels.