Abstract:Abstract:The cyclodextrin glycosyltransferase (CGTase) of the recombinants Escherichia coli pAD26 cells immobilized on cotton was optimally produced by statistical methodology. Primarily, carbon and nitrogen sources were selected by one-factor-at-a-time method. Wheat starch, Casamino acid, Edamin and Hy-soy were identified as the best nutrients. These sources were secondly confirmed by Plackett-Burman design (fifteen variables were studied with sixteen experiments), as the most significant components with resp… Show more
“…Post induction temperature is an important factor in the expression of CGTase by recombinant E. coli. To determine the effect of post induction temperature on the excretion of CGTase using immobilized cells, five different temperatures (20,25,30,35 and 37 • C) were investigated. The results (Fig.…”
Section: Effect Of Post Induction Temperature On Immobilized and Freementioning
confidence: 99%
“…Most studies for CGTase production thus far have focused on attachment to cotton [20]; entrapment in different gels, such as polyacrylamide, agar, alginate and polyvinyl alcohol-cryogel gels [9,11,21,22]; or covalent linking to a flat sheet membrane [10]. To the best of our knowledge, there have been no studies on the excretion of CGTase by E. coli that have been immobilized through a combination of adsorption and entrapment of the cells using a hollow fiber membrane.…”
“…Post induction temperature is an important factor in the expression of CGTase by recombinant E. coli. To determine the effect of post induction temperature on the excretion of CGTase using immobilized cells, five different temperatures (20,25,30,35 and 37 • C) were investigated. The results (Fig.…”
Section: Effect Of Post Induction Temperature On Immobilized and Freementioning
confidence: 99%
“…Most studies for CGTase production thus far have focused on attachment to cotton [20]; entrapment in different gels, such as polyacrylamide, agar, alginate and polyvinyl alcohol-cryogel gels [9,11,21,22]; or covalent linking to a flat sheet membrane [10]. To the best of our knowledge, there have been no studies on the excretion of CGTase by E. coli that have been immobilized through a combination of adsorption and entrapment of the cells using a hollow fiber membrane.…”
Cyclodextrins (CDs) were first isolated in 1891 as degradation products of starch from a medium of Bacillus amylobacter. They are cyclic water-soluble, nonreducing, macrocycle carbohydrate polymers constructed from a-(1-4)-linked D-glucopyranose units (naturally occurring a, b, and g formed by 6, 7, and 8 glucose units), in a ring formation and present a toroidal, hollow, truncated cone shape. Their most important property is the ability to establish specific interactions -molecular encapsulation -with various types of molecules through the formation of non-covalently bonded entities, either in the solid phase or in aqueous solution, taking up a whole molecule, or some part of it, into their cavities. This process in part mimics the "lock and key" mechanism of enzyme catalysis. Complexation may cause changes in physicochemical properties of the guest molecule (e.g., solubility, stability, kinetics and bioavailability, toxicity). Their negligible cytotoxic effects promoted them to the GRAS list and led them to be widely used in many industrial products and technologies.
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