Kinetics of extraction of total phenolic content from Sesbania grandiflora L. leaves using ultrasound

ABSTRACT The ultrasound-assisted extraction of Total Phenolic Content from Sesbania grandiflora L. leaves and its optimization with kinetics is dealt with in this study. The effect of extraction of solvents (ethanol–water composition), solid to solvent ratio (1:10–1:70), particle size (0.1–0.5x 10−3m), power (50–120 W), and extraction temperature (30–50°C) on total phenolic content (TPC) from Sesbania grandiflora leaf powder has been investigated. The overall optimized parameters for the ultrasound-assisted extraction of Total Phenolic Content from Sesbania grandiflora L. leaves are solid to solvent ratio of 1:50, particle size of 0.4–0.5 × 10−3m, power 120 W, extraction temperature 45°C with the maximum phenolic content of 14.37 × 10−3g GA/g. Comparatively, equilibration time of UAE (240 s) is very low than the conventional batch operation (960 s). A semi-empirical two parameter, Peleg’s model, assists in capturing the reaction kinetics where it elucidates the experimental behavior in a precise way. GRAPHICAL ABSTRACT