Dried fruits of T. chebula were powdered in a blender. The powdered sample was sieved through a screen (mesh size of 500 μM). For extraction, one gram of powdered sample was suspended in a 2 necked round bottom flask with a thermometer and a reflux column connected to it. The flask was filled with 150 mL of an extraction solvent: water–EtOH or water–PG. Extractions were carried out according to the CCD spherical design to be described, to determine the effect of temperature, concentration of organic solvent and time on the yield of total phenolics. After each extraction, the sample residue was separated from the extracts by filtering through a filter paper (Whatman No. 1, Whatman, USA). The resulting extracts were analyzed for total phenolic content by using a spectrophotometer. The concentrations of GA and EA in some selected extracts were also determined by using HPLC.