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Parasuraman Selvam
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Parasuraman Selvam
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Parasuraman Selvam
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Selvam, P.
Selvam, Parasuram
Selvam, Parasuraman
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3 results
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- PublicationArchitecting mesoporous AISBA-15: An overview on the synthetic strategy(01-04-2010)
; ;Krishna, Nunna V.Viswanathan, BalasubramanianThe architecture of mesoporous solids has seen many innovations based on template mechanism. Among them, SBA-type materials has thicker walls, more silanol groups, large pore sizes and enormous pore volumes imparting them with high thermal and hydrothermal stability. Thus making them advantageous for a variety of applications, and hence generated a lot of interest. In this regard, this review examines the various aspects of synthesis and their influence on altering the properties SBA-type silica materials with respect to hetero-ion substitution in the framework structure. Further, this review also deals with critical evaluation in exploiting this class of materials, in particular SBA-15 matrix, for aluminum incorporation in the framework. Different synthesis methodologies have been described and it is hoped that this review will not only serve as a source of information but also can be expected to push the knowledge domain of mesoporous solids. - PublicationImmobilization of Recombinant Endo-1,4-β-xylanase on Ordered Mesoporous Matrices for Xylooligosaccharides Production(17-10-2019)
;Shivudu, Godhulayyagari ;Khan, Sourav; Xylooligosaccharides (XOS) are emerging prebiotics, widely used in food, medicine and health care. XOS are produced by hydrolysis of xylan by acid or endoxylanase enzyme. Xylanase hydrolysis is preferred over acid due to its high specificity and absence of formation of non-toxic byproducts. Immobilized xylanase improves enzyme-stability and efficacy of XOS production through its repeated use. Though there are a few xylanases immobilized on conventional organic polymers for XOS production, immobilization of xylanse on mesoporous inorganic materials have not been investigated for XOS production. In this study, the recombinant endo-1, 4-β-D-xylanase (XynC) of B.subtilis KCX006 was purified and immobilized on ordered mesoporous matrices of carbon (CMK-3), silica (SBA-15) and zirconia (ZMF-127). The immobilized-XynC was characterized and used for XOS production by recycling. The recovered activity (RA) of immobilized-XynC varied between 55 to 84%. The maximum RA was observed for XynC immobilized on ZMF-127 matrix. All immobilized-XynC had optimum pH similar to that of free-XynC. But all immobilized-XynC gained broader temperature range (50-65°C) for optimal catalytic activity when compared with the free-XynC. Immobilization of XynC resulted in higher Km due to substrate diffusion limit. All immobilized-XynC produced free-XOS of DP 2–6 (X2-X6) and substituted-XOS from beechwood xylan and extracted crude xylans from sorghum stalks and sugarcane bagasse (SCB). The XynC immobilized on SBA-15 produced higher proportions of X2-X6 compared to ZMF-127 and CMK-3. The XynC immobilized on SBA-15 and CMK-3 retained higher activity of 85–93% after four batches of repeated use. The observed efficiency of XynC immobilized on CMK-3 and SBA-15 are higher than the reported values. The results showed that XynC immobilized on mesoporous carbon and silica matrices would be useful for production of XOS by enzyme recycling. - PublicationOrdered nanoporous silicates (IITM-56): Synthesis, characterization and applications(01-12-2010)
; ;Krishna, Nunna VamsiViswanathan, BalasubramanianMesoporous molecular sieves are special class of materials with ordered arrays of uniform pores, high surface areas and large pore volumes. These periodic silica/silica-based materials are promising for variety applications including catalysis, adsorption and separation processes. Two most common types involve MCM-41 and SBA-15 has ordered structures consisting of two dimensional hexagonal arrays of uniform mesoporous. SBA-15 has larger pores, thicker walls and higher thermal stability as compared to other mesoporous silicas including MCM-41. However, it is of interest to make materials with a combination of moderate pore size and thicker wall structure. Therefore, in this investigation, an attempt has been made to prepare materials with desired characteristics using oligomeric alkyl poly ethylene oxide (Brij-56) surfactant template. We report here, for the first time, a novel mesoporous silicate material, designated as IITM-56, with a (moderate) pore size of 38.4 Å and a wall thickness of 21 Å. XRD pattern of IITM-56 depicts structure which is typical characteristics of MCM-41/SBA-15. TG studies of IITM-56 show a 49% weight loss in conjunction with exothermic transition (DTA) suggestive of mesoporous nature of the material. This further confirmed by N2 sorption measurements, which indicate type IV isotherm with capillary condensation at 0.3-0.4 (P/Po).