"Carbopol" 934/10.0 g Dwarf Pine Needle Oil/0.1 ml Eucalyptol/1.0 ml Alcohol U.S.P./20.0 g Ephedrine Alkaloid (hydrous N.F.)/10.0 g Purified Water/960.0 ml Methyl Salicylate/0.1 ml
配制方法:
Carefullly disperse the Carbopol 934 in the water to a thin cloudy dispersion without lumps. Allow entrapped air to escape and then add the eucalyptol, methyl salicylate and dwarf pine needle oil with good mixing. Dissolve the ephedrine alkaloid in the alcohol and gradually add this to the dispersion with contant stirring. Sterilization is effected by autoclaving at 121.2'C and a gauge pressure of 15.3 psi for 15 min. The resultant product is a stable, translucent gel of pH 6.7 and viscosity of 50,000 cps (Brookfield, 20 rpm).