Deep Eutectic Solvents as New Extraction Media for Flavonoids in Mung Bean

Deep Eutectic Solvents as New Extraction Media for Flavonoids in Mung Bean Jingyu Gao College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China National Engineering Research Center for Fruit and Vegetable Processing, Beijing 100083, China Key Laboratory of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing 100083, China Longli Xie College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China National Engineering Research Center for Fruit and Vegetable Processing, Beijing 100083, China Key Laboratory of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing 100083, China Yu Peng College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China National Engineering Research Center for Fruit and Vegetable Processing, Beijing 100083, China Key Laboratory of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing 100083, China http://orcid.org/0000-0001-6766-5443 Mo Li College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China National Engineering Research Center for Fruit and Vegetable Processing, Beijing 100083, China Key Laboratory of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing 100083, China Jingming Li College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China Yuanying Ni College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China National Engineering Research Center for Fruit and Vegetable Processing, Beijing 100083, China Key Laboratory of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing 100083, China Xin Wen College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China National Engineering Research Center for Fruit and Vegetable Processing, Beijing 100083, China Key Laboratory of Fruit and Vegetable Processing, Ministry of Agriculture, Beijing 100083, China http://orcid.org/0000-0002-4549-0547

Mung beans contain abundant flavonoids like vitexin and isovitexin, which contribute to their strong bioactivities, such as antioxidant effects, so efforts should focus on extracting bioactive flavonoids as well as aligning with the goal of green extraction for specific applications. Deep eutectic solvent coupled with ultrasound-assisted extraction (DES-UAE) was applied to extract flavonoids from mung beans, and eight different DESs were compared on the extraction yield. In addition, the traditional extraction method with 30% ethanol was performed as the reference. The results showed that ethylene glycol-glycolic acid achieved the highest yield among all the DESs, 1.6 times that of the reference values. Furthermore, the DES-UAE parameters were optimized as a 60 mL/g liquid–solid ratio, 30% water content in DES, 200 W ultrasonic power, 67 °C ultrasonic temperature, and 10 min extraction time, leading to the DES extract with the maximum extraction yield of 2339.45 ± 42.98 μg/g, and the significantly stronger DPPH and ABTS radical scavenging ability than the traditional extract. Therefore, employing DES and ultrasonic extraction together offers a green method for extracting flavonoids from mung beans, advancing the development and utilization of plant-derived effective components in a sustainable manner.
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