Irradiation with ultraviolet light of chlorpromazine, prochlorperazine, frusemide or hydrochlorothiazide in either aqueous or methanol solution yielded free chloride ion. Potentiometric methods were used to detect one mol of chloride ion produced per mol of drug irradiated in deoxygenated solution, with a concomitant equimolar appearance of hydrogen ion. Saturation of the solutions with oxygen strongly inhibited the photolysis reaction in methanol but only partially inhibited the production of Cl− and H+ in aqueous solution. The oxidation of 2,5‐dimethylfuran is photosensitized by these drugs more effectively in methanol compared with aqueous solution. The photochemical behaviour is consistent with a photo‐ dissociative process occurring predominantly in methanol while photoionization predominates in aqueous media. No chloride ion was detected after extended irradiation of Chlortetracycline, demeclocycline, chlordiazepoxide and hexachlorophane. The photolability of the chlorine in the compounds tested correlated with their ability to photosensitize oxidation by the Type I (free radical) mechanism.
The application of inductively coupled plasma atomic emission spectrometry (ICP-AES) to the determination of the concentration of complex boron-containing compounds in biological tissue samples is described. Tissue digestion is achieved with perchloric acid and hydrogen peroxide in 1 hr at 75 degrees C. The ICP-AES method gave a linear response for elemental boron concentration in the range 0.05 to 100 ppm and does not require the reduction of the boron to a simple species, such as boric acid. Complete recovery of boron in complex boron cluster compounds was obtained. The procedure has been applied to the determination of the boron content in compounds synthesised for neutron capture therapy and is suitable for use in biodistribution studies of such compounds.
Controlled postprandial glucose level is an important strategy in preventing DM type 2. Inhibitors of α-glucosidase have been postulated to be useful agents in managements of DM type 2. This study aims to isolate and identify of α-glucosidase inhibitor fromAspergillus terreus F38 by liquid fermentation. The mycelium extract of A. terreus F38showed strong activity against α-glucosidase with IC 50 value of 9.65μg/mL. Separation and purification of mycelium ectract yielded compound I (Butyrolactone III). The structure was establish on the basis of spectral analysis, according to the data obtained by NMR and LCMS-MS experiments. Compound I showed potential activity against α-glucosidase with IC 50 value of 13.87 μg/mL. Therefore, the metabolites from A. terreus F38 can be used as lead compound to design potent α-glucosidase inhibitory agents.
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