“FTIR SPECTRUM COMPARISON OF PLANTS Purgatives [ ALOE VERA LINNEO . ALOE BARBADENSIS MILLER , RHEUM PALMATUM ( Rhubarb ) , RHAMNUS Pursiana ( SACRED SHELL ) AND CASSIA SP. (SEN )]”. 2011. Revista Peruana De Química E Ingeniería Química 14 (1 y 2): 86-94. https://revistasinvestigacion.unmsm.edu.pe/index.php/quim/article/view/4613.