Optimized Pretreatment and Preparative Chromatography for Vitexin Purification from Mung Bean Seed Coats
Abstract
This research focuses on the valorization of mung bean hull, a major agro-industrial byproduct, through the development of an optimized process for the high-purity isolation of the bioactive flavonoid, vitexin. Vitexin is recognized for its significant nutraceutical properties, including anticancer, antioxidant, and anti-inflammatory activities, making its high-purity isolation crucial for pharmaceutical and functional food applications. The study emphasized the importance of pretreatment methods to enhance extraction efficiency and downstream purification. Raw material preparation involved controlled grinding and sieving, followed by the selection of a particle size fraction (80-150 mesh) for subsequent pretreatment. This fraction was subjected to a crucial washing step with ethanol to effectively remove residual starch particles. This ethanol washing minimized the loss of vitexin (unlike deionized water washing) and was vital for preventing column clogging and back pressure issues during subsequent chromatographic purification. The optimal solvent extraction condition was determined to be a 50% ethanol/deionized water mixture, which yielded the highest vitexin concentration of 24.29 mg/ga result consistent with tuning the solvent polarity to an optimal dielectric constant (∼45.4) and the effective removal of the starch matrix. For the high-purity purification of vitexin, a Reverse Phase Preparative Liquid Chromatography (Prep-LC) system was utilized. The key operating…
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