Extraction of anthraquinone and salicylic acid from Aloe barbadensis miller

Abstract

The objective of the research was to identify suitable parameters for extraction of anthraquinone, and salicylic acid from Aloe (Aloe barbadensis Miller). The parameters were evaluated including ethanol concentration (99.5, 80.0, 50.0%), material/solvent ratio (50 g/50 mL, 50 g/100 mL, 50 g/150 mL, 50 g/200 mL), stirring speed (100, 200, 300, 400 rpm), temperature (40, 45, 50, 55°C), extraction time (10, 20, 30, 40 minutes). Optimum conditions for anthraquinone and salicylic acid extraction on a laboratory scale were the ratio of 1/2 (g/mL), 50°C, 20 minutes and 300 rpm for the ratio of material/solvent, extraction temperature, extraction time, stirring speed, respectively using ethanol 99.5% as solvent extraction. The maximum anthraquinone and salicylic acid content are 0.31 mg/mL and 2.03 mg/mL, respectively.