Effect of drying conditions on the preservation of selected bioactive compounds in Moringa oleifera aqueous extract: acetic acid, butyric acid, γ-aminobutyric acid, salicin, and glycine

Overall, the findings of this study revealed that various drying methods have a significant impact on the preservation of key bioactive compounds in Moringa oleifera. Sun and oven drying were more effective in maintaining phenolic and flavonoid contents, whereas shade drying was better in preserving antioxidant activity and certain organic acids such as acetic and butyric acids. Additionally, specific compounds like salicin and glycine exhibited different responses to drying conditions; salicin reached its highest levels under sun drying, while glycine was maximized with sun drying and moderately retained during oven drying. These results emphasize the importance of selecting appropriate drying techniques based on the targeted bioactive compounds to optimize the medicinal value of herbal plants.