01733nas a2200241   4500008004100000020002200041022001400063245006700077210006600144260009900210300001400309490000800323520094300331100001801274700001601292700002101308700002001329700001001349700001201359700001201371700001101383856009701394       2007                        eng d  a978-0-444-53068-4  a0167-299100aImmobilization of Ntn hydrolases on APTES fuctionalized SBA-150 aImmobilization of Ntn hydrolases on APTES fuctionalized SBA15  aSara Burgerhartstraat 25, Po Box 211, 1000 AE Amsterdam, NetherlandsbElsevier Science BVcAUG  a1891-18980 v1703 a<p>APTES Functionalized mesoporous silica SBA-15 molecular sieves have been prepared and used for immobilization of Penicillin G acylase. Physico chemical characterization was done by nitrogen adsorption, powder XRD and TEM methods to understand the nature of immobilized PGA enzyme. XRD data indicate a good mesoscopic order. The characteristic hexagonal features of SBA-15 were maintained in PGA immobilized SBA-15 samples. Incorporation of PGA does not affect the original pore structure of the parent SBA-15. The adsorption of PGA on SBA-15 from buffered solutions with a pH value, 7.8 has been studied as a model protein adsorption system. The maximum activity of the immobilized enzyme was observed at pH 7.8, slightly below the isoelectric point of the enzyme. The loading capacity of immobilized PGA is 34 mg protein per 0.5 g of SBA-15. The stability of Penicillin G acylase was enhanced by the physical entrapment in SBA-15.</p>1 aShah, Pallavi1 aSridevi, N.1 aPrabhune, Asmita1 aRamaswamy, Veda1 aXu, R1 aGao, Z.1 aChen, J1 aYan, W  uhttp://library.ncl.res.in/content/immobilization-ntn-hydrolases-aptes-fuctionalized-sba-15-002249nas a2200229   4500008004100000022001400041245010600055210006900161260007300230300001200303490000700315520140000322653002401722653003601746653001101782100002001793700001601813700002001829700002101849700002001870856012901890       2014                        eng d  a0141-813000aImmobilization of bile salt hydrolase enzyme on mesoporous SBA-15 for co-precipitation of cholesterol0 aImmobilization of bile salt hydrolase enzyme on mesoporous SBA15  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcFEB  a218-2240 v633 a<p>We describe herein a simple and effective strategy for immobilization of bile salt hydrolase enzyme by grafting glutaraldehyde groups inside channels of APTES functionalized SBA-15. The increase in glutaraldehyde concentration prevents leakage of enzyme but showed a steep decrease in enzyme activity in the immobilized matrix. So the degree of cross-linking should be the minimum possible to ensure sufficient stability without loss of activity. Cross-linking carried out with 0.1% glutaraldehyde concentration showed the highest activity, so this was used in all further experiments. Physico-chemical characterizations of the immobilized enzyme were carried out by XRD, N-2 adsorption, TEM, FUR and Si-29 CP-MAS NMR techniques. Immobilized BSH exhibits enhanced stability over a wide pH (3-11) and temperature range (40-80 degrees C) and retains an activity even after recycling experiments and six months of storage. From our in vivo research experiment toward co-precipitation of cholesterol, we have shown that immobilized BSH enzyme may be the promising catalyst for the reduction of serum cholesterol levels in our preliminary investigation. Enhancement in pH stability at the extreme side of pH may favor the use of immobilized BSH enzyme for drug delivery purpose to with stand extreme pH conditions in the gastrointestinal conditions. (C) 2013 Elsevier B.V. All rights reserved.</p>10aBile salt hydrolase10aCo-precipitation of cholesterol10aSBA-151 aBhange, Pallavi1 aSridevi, N.1 aBhange, Deu, S.1 aPrabhune, Asmita1 aRamaswamy, Veda  uhttp://library.ncl.res.in/content/immobilization-bile-salt-hydrolase-enzyme-mesoporous-sba-15-co-precipitation-cholesterol-0