Soluble bio-organic substances (SBO) obtained from urban bio-wastes have been investigated as chemical auxiliaries in photochemical processes. For this purpose, photodegradation of the antibiotic sulfadiazine (SDZ) (25 mg L-1) was studied under simulated sunlight. Experiments were performed to check the role of the SBO as additives for the photo-Fenton process ([SBO] 0 = 20 mg L-1 , [H 2 O 2 ] 0 = 244 mg L-1 , [Fe 3+ ] 0 = 5 mg L-1) at pH 3, 5.2 and 7. The results show that in slightly acidic conditions (pH = 5.2) the SBO improve the photo-Fenton process. Organic compounds present in the SBO are able to complex iron cations and hence, iron precipitation could be avoided. Finally, the results of a Doehlert uniform array design were used to fit a neural network model, which was found to be an effective, simple approach to successfully modeling the photo-Fenton degradation using SBO within the range of experimental conditions. This model might be useful in process optimization.
-Mangiferin is a natural xantone extensively distributed in higher plants showing different pharmacological properties. In the present study, an ultrasonicassisted extraction (UAE) method was evaluated for obtain mangiferin from Mangifera indica L. (c.v Mango Macho) leaves. Differents extraction parameters were optimized using a response surface methodology and the best conditions reached were at 47% ethanol concentration, a liquid-to-solid ratio 47:1, and an extraction time of 63min. under ultrasound irradiation of 150W. In these circumstances, the yield of mangiferin was 24.15±0.015mg/g. For first time, was evaluated the ultrasound assited extraction to higher frecuency and the value of the yield reached was 6.38± 0.062mg/g. Comparison of UAE of mangiferin respect to microwave and aggited tank was realized and the yield obtained by UAE was inferior, however the ultrasonic time was minor respect to conventional extraction technique. The ultrasonic-assisted extraction is an alternative method to use for the extraction of mangiferin from Cuban mangos.
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