Aligarh Muslim University

About: Aligarh Muslim University is a education organization based out in Aligarh, Uttar Pradesh, India. It is known for research contribution in the topics: Population & Adsorption. The organization has 8218 authors who have published 16416 publications receiving 289068 citations. The organization is also known as: AMU.

The surfactant-induced conformational and activity alterations in Rhizopus niveus lipase.

Abstract: In this study, we have reported the effect of nonionic, anionic, cationic, and zwitterionic detergents on the enzymatic activity and structural stability of Rhizopus niveus lipase Secondary structural changes were monitored by Far-UV CD which shows that surfactant induces helicity in the Rhizopus niveus lipase protein which was maximum in case of CTAB followed by SDS, CHAPS, and Brij-35 Similarly, tertiary structural changes were monitored by tryptophan fluorescence We also carried out enzyme kinetics assays which showed that activity was enhanced by 15- and 11-fold in the presence of CHAPS and Brij-35, respectively Furthermore, there was a decline in activity by 20 and 30 % in case of SDS and CTAB, respectively These studies may be helpful in understanding detergent–lipase interaction in greater detail as lipases are used in many industrial processes

Synthesis of samarium-doped zinc oxide nanoparticles with improved photocatalytic performance and recyclability under visible light irradiation

Abstract: Samarium-doped ZnO nanoparticles (1%, 3%, and 5%) were synthesized by a gel-combustion route and their application as an efficient photocatalyst for the degradation of Malachite green (MG) dye is demonstrated. These nanoparticles were characterized by spectroscopic techniques (UV-vis and photoluminescence), micrograph techniques (SEM and TEM), X-ray diffraction, and energy dispersive X-ray, in order to evaluate their optical and structural properties, particle size distribution, and morphology. The UV-vis spectroscopic studies indicated that Sm doping increased the visible light absorption ability of the Sm-doped ZnO nanoparticles and a redshift for the Sm-doped ZnO nanoparticles appeared when compared to ZnO nanoparticles. An enhancement in the optical absorption of the Sm-doped ZnO nanoparticles indicated that it can be used as an efficient photocatalyst under a visible light irradiation. The effect of tert-butyl alcohol and disodium salt of ethylenediaminetetraacetic acid as the scavengers in the photocatalysis process revealed that hydroxyl radicals (˙OH) and holes (h+) were the reactive species responsible for the degradation of MG. The degradation mechanism has been proposed for the degradation of MG dye under the visible light irradiation. The recyclability of the Sm-doped ZnO nanoparticles for the MG dye degradation is also demonstrated.