2.3. Ultrasonic assisted extraction experiment
Extraction experiments were conducted in a 250 ml glass vessel. In all typical experiments, the vessel was charged with
the dry gel and 200 ml solvent. 20 KHz ultrasonic probe was used to generate waves. Samples were collected at different
intervals for entire run and estimated aloin using HPLC. The selection of organic solvent, particle size, dry gel solid loading
(2.5 % to 10 %) and temperature (30 0C to 50 0C) were investigated to select optimum conditions for the UAE respectively.