Matches in SemOpenAlex for { <https://semopenalex.org/work/W2787687440> ?p ?o ?g. }
- W2787687440 abstract "Due to wide use in medical applications and biocompatibility, dextran is an interesting polysaccharide. In this thesis, O-alkynyl ethers of dextran were studied due to the special properties and reactivity of terminal alkynes. Pentynyl dextrans (PyD) were prepared using 5-chloro-1-pentyne and Li-dimsyl in DMSO and characterized by elemental analysis, ATR-IR, NMR spectroscopy, GLC and ESI-MS. Monomer analysis of PyD after methanolysis and trimethylsilylation showed substitution following the order O-2 > O-4 ≥ O-3. PyD (DS 0.43) complexation with Ag forms a product containing 24% Ag which after reduction with formic acid displayed Ag nanoparticles of diameter 4-10 nm. For further functionalyzation, different azides i.e. 2-azidoethylamine, 3-azido-1-propanol, 6-azido-N-Boc-hexylamine, 4-azidobutyric acid, 3-azido-1-propanethiol, N-biotinyl-2-aminoethylazide and α-tocopheryl azide were reacted in a copper-catalyzed 1,3-dipolar cycloaddition with PyD. In all reactions ca. 60-100% of pentynyl groups were converted. Click product with a biotinyl derivative was shown to bind streptavidin, labeled with a fluorophor in solution as well as after spin-coating.In further studies PyD was tested for its ability to immobilize lipase (from R. arrhizus) and was compared with commercial adsorbents. In this comparative investigation, PyD-lipase turned out to be superior to all ion-exchange resin-based biocatalysts with regard to esterifcation activity, storage stability and reuseabilty." @default.
- W2787687440 created "2018-02-23" @default.
- W2787687440 creator A5036582942 @default.
- W2787687440 date "2011-12-23" @default.
- W2787687440 modified "2023-09-27" @default.
- W2787687440 title "Alkynyl ethers of dextrans as Intermediates for new Functional Biopolymers" @default.
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