UPLC-PDA Phenolic Compounds Profile of Mango Peel Extracts Obtained using Different Solvents and Ultrasound-Assisted Extraction

This study evaluated the performance of two techniques – conventional solvent extraction (CSE) and ultrasound-assisted extraction (UAE) – using different solvents (50% methanol, 50% ethanol, 70% acetone) for the extraction of phenolics from mango peel. For each mango peel extract (MPE), a further purification step was performed on an OASIS HLB 6 cc VAC-packed column. Subsequently, the phenolic compound profile was quantified using Ultra Performance Liquid Chromatography accoupled with a Photodiode Array (UPLC-PDA), and the antioxidant activity was also assessed. The results indicated that using 50% methanol as an extraction solvent yielded more significant phenolics, such as mangiferin, gallic acid, quercetin, and rutin. Additionally, the extracts obtained by UAE with different solvents showed a higher phenolic compound content, with mangiferin being the most predominant, mainly when methanol was used (222.34 mg/100 g DW) and higher antioxidant activity than extracts obtained by CSE, especially when acetone was used (364.00 ± 13.00 µmol Trolox/g DW). Overall, the results indicate the potential use of these mango by-products as a source of natural ingredients for the development of functional food.