Leaves and branches of Machaerium hirtum Vell. (Fabaceae), native to South America, were subjected to phytopharmacological investigation in order to identify its major chemical constituents and evaluate its extracts, fractions and isolated compounds in assays for anti-inflammatory activities. These were performed using mouse ear edema model, pleurisy and myeloperoxidase activity assays. Six compounds were isolated and identified as the flavanones swertisin and isovitexin, the alkaloid 4-hydroxy-N-methylproline, the triterpenes friedelin and lupeol, and the steroids sitosterol and stigmasterol. These compounds were identified by nuclear magnetic resonance of (1)H and (13)C data, in comparison with literature.
The present work describes an alternative process for glucose oxidation via photoelectrocatalytic technique using Ti/TiO 2 nanotubes as photoanodes. Under optimum experimental conditions, which entailed 10.0 mM glucose in 0.1 M Na 2 SO 4 , pH 6.60, E app = 1.5 V and UV irradiation we were able to convert 78% of glucose following 180 min of photoelectrocatalysis. Out of that, only 28% was, in effect, converted to CO 2 as detected by total organic carbon removal. During the course of the process, a large part of this glucose was found to be transformed into products among them including Arabinose, Arabinitol, 4ketoglicose, glucohexodialdose, Glucone-d-Lactone, 6-deoxiglucose and Gluconic Acid, where this detection was aided by ion-exchange chromatography with amperometric detection and gas chromatography-mass spectra. The results thus essentially demonstrate that photoelectrocatalys can be considered a suitable alternative in fostering glucose conversion, in aqueous medium, to high added value products using a relatively simple and economic method.
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