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Leila Seifikar Gomi,Maryam Afsharpour,Panagiotis Lianos 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.89 No.-
A novel N-doped SiO2@SiC core shell has been synthesized and functionalized with amino groups. Then,amino hybrid of tungsten oxide was supported on the surface of functionalized SiO2@SiC core shell byimmobilization of tungsten complex and coordination of ethylenediamine to tungsten centers. Then, thecatalytic activities of prepared hybrids were investigated in oxidative desulfurization of model fuels. Toevaluate the role of silicon carbide support, silica nanospheres also were functionalized and its catalyticperformance was compared. The results indicate that the SiC catalyst shows higher catalytic activity(99.9%, 160 min) compared to the SiO2 analogue (61%, 160 min).
Vahid Ghasemzadeh-mohammadi,Bahman Zamani,Maryam Afsharpour,Abdorreza Mohammadi 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.5
In this research, optimal conditions for extraction of caffeine and polyphenols were established from Iranian green tea leaves. In the first step, caffeine was extracted with efficacy about 86% versed to 4.5% of EGC ? EGCG. The EGCG ? EGC was extracted from partially decaffeinated green tea leaves through microwave- assisted extraction (MAE) and ultrasound-assisted extraction (USE) with efficiency levels of 95 and 85%, respectively. The best results for the MAE process were obtained with 7.8 min and three number of extraction cycles and for the USE process were as followed: time 57 min, temperature 65 C, and the number of extraction cycles 3. The total phenol content values at the best conditions of MAE and the USE processes were 125 ± 5 and 96 ± 6 mg gallic acid/g DW. The 50% inhibition (IC50) on 1,1-diphenyl-2-picrylhydrazyl (DPPH) were 56 and 66 mg/ g of phenol for the MAE and USE processes.