Abstract
Cassia singueana Del. (Fabaceae) is a rare medicinal plant used in the traditional medicine preparations to treat various ailments. The root of C. singueana is a rich source of anthraquinones that possess anticancer, antibacterial and antifungal properties. The objective of this study was to develop an ultrasound-assisted extraction (UAE) method for achieving a high extraction yield of anthraquinones using the response surface methodology (RSM), Box-Behnken design (BBD), and a recycling preparative high-performance liquid chromatography (HPLC) protocol for isolation of anthraquinones from C. singueana. Optimisation of UAE was performed using the Box-Behnken experimental design. Recycling preparative HPLC was employed to isolate anthraquinones from the root extract of C. singueana. The BBD was well-described by a quadratic polynomial model (R2 =0.9751). The predicted optimal UAE conditions for a high extraction yield were obtained at: extraction time 25.00min, temperature 50°C and solvent-sample ratio of 10mL/g. Under the predicted conditions, the experimental value (1.65±0.07%) closely agreed to the predicted yield (1.64%). The obtained crude extract of C. singueana root was subsequently purified to afford eight anthraquinones. The extraction protocol described here is suitable for large-scale extraction of anthraquinones from plant extracts.
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