Formulation and evaluation of suspensions: Mefenamic acid prodrugs

Gastrosparing novel prodrugs [MAM and MAT] synthesized consisted of mefenamic acid [MA] with menthol [M] and thymol [T]. Structural characterizations of synthesized esters were done by Infra red spectroscopy [IR], proton nuclear magnetic resonance [[1]HNMR], mass spectroscopy. After evaluation of pharmacological i.e. anti-inflammatory, analgesic and ulcerogenic activities, the preformulation studies were undertaken. Based on these a few formulation [suspensions] were designed and prepared. The formulated suspensions were evaluated for content uniformity, sedimentation volume, recovery studies, redispersibility, viscosity, pH, particle size, zeta potential, effect of temperature and in-vitro dissolution rate. All the above parameters were found to be within the limit these indicated that the synthesized esters are good candidate for liquid dosage form. Thus it can be concluded synthesized prodrugs can be formulated in suspension form

Synthesis and evaluation of 4-substituted semicarbazones of levulinic acid for anticonvulsant activity / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

<p><b>OBJECTIVE</b>A series of 4-aryl substituted semicarbazones of levulinic acid (4-oxo pentanoic acid) was designed and synthesized to meet the structural requirements essential for anticonvulsant activity.</p><p><b>METHODS</b>All the compounds were evaluated for anticonvulsant activity. Anticonvulsant activity was determined after intraperitoneal (i.p.) administration to mice by maximal electroshock (MES) and subcutaneous metrazol (ScMet) induced seizure methods and minimal motor impairment was determined by rotorod test.</p><p><b>RESULTS</b>A majority of the compounds exhibited significant anticonvulsant activity after intraperitoneal administration. In the present study 4-(4'-fluoro phenyl) levulinic acid semicarbazone emerged as the most active molecule, showing broad spectrum of activity with low neurotoxicity. Unsubstituted levulinic acid semicarbazone was found to be inactive in all the screens.</p><p><b>CONCLUSION</b>The results obtained validate the hypothesis that presence of an aryl group near the semicarbazone moiety is essential for anticonvulsant activity. The results also indicate that the hydrophilic-hydrophobic site can accommodate hydrophilic groups.</p>