Use of solubility parameter to design dry suspension of cefaclor as a dual pack system

Determination of folic acid by capillary zone electrophoresis with indirect chemiluminescence detection

A capillary electrophoresis method with on-line inhibited chemiluminescence (CL) detection was first used to determine folic acid (FA). This method was established based on the quenching effect of FA on the CL reaction of luminol with a Ag(iii) complex in alkaline medium. The separation was conducted with a 20.0 mM sodium borate buffer containing 1.0 mmol L^-1 luminol. Under optimized conditions, FA was baseline separated and detected in less than 10 min. The limit of detection of FA was 1.3 mg L^-1, with a linear range of 5.0-150.0 mg L^-1 (r = 0.9953). The RSD value was 2.8% for intra-day precision and 5.4% inter-day precision. The recoveries of the standard addition of tablets and human urine ranged from 90.3% to 107.5% and from 82.0 to 105.7%, respectively. The proposed method was successfully applied to determine FA contents in commercial pharmaceutical tablets and human urine samples. Results suggested that this method was simple and robust.

Determination and evaluation of solubility parameter of satranidazole using dioxane-water system

Satranidazole, a potent broad spectrum antiprotozoal, is a poorly water-soluble drug and has low bioavailability on oral administration. One of the important methods to improve the solubility and bioavailability of a less water-soluble drug is by the use of cosolvents. The solubility enhancement produced by binary blends with a cosolvent (dioxane) was studied against the solubility parameter of solvent blends (δ(1)) to evaluate the solubility parameter of drug (δ(2)). Solubility parameter of drug (δ(2)) was evaluated in blends of dioxane-water system. The results obtained were compared with the δ(2) values obtained using Molar Volume Method and Fedor's Group Substitution Method. The binary blend water-dioxane (10:90) gave maximum solubility with an experimental δ(2) value of 11.34 (Cal/cm(3))(0.5) that was comparable to the theoretical values of 11.34 (Cal/cm(3))(0.5) determined by Molar Volume Method and 11.3928 (Cal/cm(3))(0.5) when determined by Fedor's Group Substitution Method, which is in good agreement with solubility measurement method.