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Norouzy, Amir,Habibi-Rezaei, Mehran,Qujeq, Durdi,Vatani, Maryam,Badiei, Alireza Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.1
A sensory element against carbaryl, as a widely used pesticide was prepared based on adsorbed acetylcholine esterase (AChE) from Torpedo california. Octadecyl was substituted on macro-porous silica, confirmed by infra-red (IR) spectroscopy and quantitatively estimated through thermo-gravimetric analysis (TGA). Immobilization of the enzyme was achieved by adsorption on this support. Activity of the immobilization product was measured as a function of the loaded enzyme concentration, and maximum binding capacity of the support was estimated to be 43.18 nmol.mg-1. The immobilized preparations were stable for more than two months at storage conditions and showed consistency in continuous operations. Possible application of the immobilized AChE for quantitative analysis of carbaryl is proposed in this study.
Amir Norouzy,Mehran Habibi-Rezaei,Durdi Qujeq,Maryam Vatani,Alireza Badiei 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.1
A sensory element against carbaryl, as a widely used pesticide was prepared based on adsorbed acetylcholine esterase (AChE) from Torpedo california. Octadecyl was substituted on macro-porous silica, confirmed by infra-red (IR) spectroscopy and quantitatively estimated through thermo-gravimetric analysis (TGA). Immobilization of the enzyme was achieved by adsorption on this support. Activity of the immobilization product was measured as a function of the loaded enzyme concentration, and maximum binding capacity of the support was estimated to be 43.18 nmol․mg-1. The immobilized preparations were stable for more than two months at storage conditions and showed consistency in continuous operations. Possible application of the immobilized AChE for quantitative analysis of carbaryl is proposed in this study.
Nasrollah Majidian,Mehran Rezaei,Narges Habibi 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.7
Nanostructured γ-Al2O3 with high surface area and mesoporous structure was synthesized by sol-gel methodand employed as catalyst support for nickel catalysts in methane reforming with carbon dioxide. The prepared sampleswere characterized by XRD, BET, TPR, TPH, SEM and TPO techniques. The BET analysis showed a high surfacearea of 204m2g−1 and a narrow pore-size distribution centered at a diameter of 5.5 nm for catalyst support. The resultsrevealed that an increase in nickel loading from 5 to 15 wt% decreased the surface area of catalyst from 182 to 160m2g−1. In addition, the catalytic results showed an increase in methane conversion with increase in nickel content. TPOanalysis revealed that the coke deposition increased with increasing in nickel loading, and the catalyst with 15 wt%of nickel showed the highest degree of carbon formation. SEM and TPH analyses confirmed the formation of whiskertype carbon over the spent catalysts. Increasing CO2/CH4 ratio increased the methane conversion. The BET analysisof spent catalysts indicated that the mesoporous structure of catalysts still remained after reaction.