Determination and validation of spectrophotometric analytical method for quantification of total flavonoids in the leaves of Azadirachta indica A. Juss. (Meliacease) and optimization of the ultrasound-assisted extraction conditions. RSD [Internet]. 2022 Feb. 13 [cited 2025 Dec. 6];11(3):e9211326135. Available from: https://rsdjournal.org/rsd/article/view/26135