Curcumin, a naturally occurring highly lipophilic molecule has wide range of pharmacological activities. However, its limitedaqueous solubility and degradation at alkaline pH restricts its bioavailability. Solid dispersions (SD) of curcumin-polyethylene glycol (PEG 4000, 6000) in the ratio of 1:3, 1:5, and 1:10 wereprepared in an attempt to increase the solubility and dissolution by fusion method. Physical characterization by IR, DSC studies, in comparison with corresponding physical mixtures revealed the changes in solid state during the formation of dispersion and justified the formation of high-energy amorphous phase. Both solubility and dissolution of curcumin solid dispersions were significantly greater than those observed for physical mixtures and intact curcumin and it was observed that the dissolution of PEG 4000 was higher as compared to PEG 6000 in 30 mins. The powder DSC thermogram indicated that the amorphous curcumin was obtained from all solid dispersions. This may aid in improving bioavailability and dose reduction of the drug.

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The corrosion inhibition properties of methanol extract of Jatropha curcas (JC) were investigated for mild steel (MS) in acidic medium using weight loss and potentiodynamic methods. Corrosion inhibition of MS in 1MH2SO4 was studied in the absence and presence of various concentrations of the methanolic extract of Jatropha curcas barks. The results showed an increase in corrosion inhibition with increasing concentration of the extract. The inhibition efficiency of 1000 ppm JC extract from the weight loss and potentiodynamic polarization methods were approximately 92.0% after 24 hours immersion in the acidic solution. Open circuit potential (OCP) and potentiodynamic polarization measurements showed that the JC extract acts as a mixed-type inhibitor.

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