Drying kinetics, modelling and total flavonoid content of Phyllanthus niruri L. under different drying temperature

Abstract Phyllanthus niruri L. drying kinetics were empirically examined at the temperature of 40 °C, 45 50 55 and 60 °C in an air-drying oven. The herbs’ aerial components (stems, leaves, flowers) picked after 9-10 weeks planting. procedure ended when sample weights remained unchanged. time varied from 7 to 20.5 hours. CurveExpert Professional was utilized establish optimal modeling fit. According statistical analysis, notably for root mean square error ( RMSE ), determination coefficient R 2 residual chi-square χ Midilli-Kucuk has deemed function characterizing P. drying. effective diffusivity activation energy reported be 4.050x10 -9 m /s – 1.620x10 -8 55.23 kJ/mol, respectively. UV-VIS spectrophotometry also employed analyze effects on flavonoid content. measurement showed that content all dried herbs 1.18-1.69 %, which already meets Farmakope Herbal Indonesia’s standard. highest found lowest temperature.