Abstract
Trypsin was covalently coupled to poly(N-isopropylacrylamide) (pNIPAAm), a thermoresponsive polymer, through reactive groups of N-acryloxysuccinimide (NAS), which were incorporated into the polymer and the enzyme, respectively, prior to immobilization. Higher activity was retained for the enzyme that was coupled to the preformed copolymer of NIPAAm-NAS (conjugate I) as compared to conjugate II prepared by the other method. The conjugated trypsin was found to be more resistant to heat treatment than the free enzyme. Just the physical presence of the polymer had no significant influence on the thermal stability of the free trypsin. The activity loss in the conjugated enzymes during repeated precipitation/dissolution cycles was more due to incomplete recovery than to inactivation by temperature during the precipitation step. Conjugate I exhibited significant retention of activity after storage in acetonitrile and DMF, and was also used for dipeptide synthesis in acetonitrile.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
