Browsing NTNU Open by Author "Christensen, Bjørn E."
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Alginate Blocks and Block Polysaccharides: A Review
Solberg, Amalie; Draget, Kurt Ingar; Schatz, Christophe; Christensen, Bjørn E. (Peer reviewed; Journal article, 2023)Alginates consist of distinct blocks with different physical properties. This short review focuses on research carried out in Trondheim related to the early discovery of the block structure, their isolation, their different ... -
Association with Imidazole in the Cooperative Order–Disorder Transition in Aqueous Solution of Schizophyllan
Yoshiba, Kazuto; Yasuda, Yota; Christensen, Bjørn E.; Kondo, Chisaki; Miyazaki, Yuji; Nakano, Motohiro (Peer reviewed; Journal article, 2022)Schizophyllan, a triple helical polysaccharide, exhibits cooperative order–disorder transition (CODT) in aqueous solutions. The transition transforms the ordered structure (triple helix I) formed between the branched side ... -
Characterization of alginate-based nanoparticles with atomic force microscopy, scanning electron microscopy, and light scattering
Røgenes, Ingrid Christine (Master thesis, 2023)Denne avhandlingen har som mål å etablere en karakteriseringsprotokoll for Gm-b-Dexn nanopartikler (NP). Det finnes kun begrensede data for denne typen biopolymer-baserte NPer, og en grundig karakteriseringsprotokoll hadde ... -
Chitin Oligomers and Chitin-based Block Polysaccharides: Terminal Conjugation of Dextran to Water Insoluble Chitin Oligomers
Muren, Trine (Master thesis, 2021)Nyere forskning har hatt et skifte i fokus fra utnyttelse av syntetiske polymerer til utnyttelse av biopolymerer. Produksjon av blokk polysakkarider er et relativt nytt felt med høyt potensial grunnet allsidigheten og ... -
Chitin-b-chitosan diblocks: preparation and characterization
Holmås, Elise Borgen (Master thesis, 2022)Formålet med denne oppgaven var å lage og karakterisere en kitin-b-kitosan diblokk av typen AnM-PDHA-MDm. Dette inkluderte en oppskaleringsmetode for AnM oligomerer basert på en protokoll fra Mo et al.(22). Kitin og kitosan ... -
Click chemistry for block polysaccharides with dihydrazide and dioxyamine linkers - A review
Solberg, Amalie; Vikøren Mo, Ingrid; Omtvedt, Line Aa.; Strand, Berit L.; Aachmann, Finn L.; Schatz, Christophe; Christensen, Bjørn E. (Peer reviewed; Journal article, 2021)Engineered block polysaccharides is a relatively new class of biomacromolecules consisting of chemical assembly of separate block structures at the chain termini. In contrast to conventional, laterally substituted ... -
Comparative characterization of biotechnologically modified xanthan
Johansen, Kristoffer (Master thesis, 2023)Xanthan er et allsidig bakterielt ekstracellulært polysakkarid (EPS) som brukes i mange ulike bransjer på grunn av sine unike fysiske egenskaper. Modifisering av egenskapene til xanthan kan føre til nye bruksområder av ... -
Conformation and cooperative order-disorder transition in aqueous solutions of β-1,3-D-glucan with different degree of branching varied by the Smith degradation
Yoshiba, Kazuto; Saheki, Toshihiko; Christensen, Bjørn E.; Dobashi, Toshiaki (Peer reviewed; Journal article, 2019)β‐1,3‐d‐glucan with different degrees of branching were obtained by selectively and gradually removing side chains from schizophyllan, a water‐soluble triple helical polysaccharide, using the Smith degradation. Size exclusion ... -
Conformation of carboxylated schizophyllan in aqueous solution
Yoshiba, Kazuto; Sato, Takahiro; Osumi, Takaaki; Ulset, Ann-Sissel Teialeret; Christensen, Bjørn E. (Journal article; Peer reviewed, 2015)Carboxylated schizophyllan (sclerox) samples of different degrees of oxidation were molecularly characterized by size exclusion chromatography equipped with a multi-angle light scattering detector (SEC-MALS) in 0.10 M ... -
Conformation of the Acid Form of Xanthan in Water and DMSO
Osebakken, Karina Gjerdevik (Master thesis, 2019)Xantan er et høymolekylært polysakkarid som på grunn av sine viskositetsfremmende egenskaper er mye brukt i ulike industrier. Disse egenskapene skyldes strukturen, hvilket er bekreftet å være en dobbel heliks. Heliksen ... -
Conjugation to the chain termini of chitin oligosaccharides
Roness, Ragnhild Bardal (Master thesis, 2017)Today's polymer science is based largely on the creation of synthetic block copolymer structures. The possibility of creating block copolymer structures from biological polysaccharides with the same physiochemical properties ... -
Cooperative Order−Disorder Transition of Carboxylated Schizophyllan in Water−Dimethylsulfoxide Mixtures
Yoshiba, Kazuto; Dobashi, Toshiaki; Ulset, Ann-Sissel Teialeret; Christensen, Bjørn E. (Journal article; Peer reviewed, 2018)Carboxylated schizophyllan (“sclerox”) is a chemically modified polysaccharide obtained by partial periodate oxidation and subsequent chlorite oxidation of schizophyllan, a water-soluble neutral polysaccharide having a ... -
Degradation kinetics of peptide-coupled alginates prepared via the periodate oxidation reductive amination route
Dalheim, Marianne Øksnes; Ulset, Ann-Sissel Teialeret; Jenssen, Ina Beate; Christensen, Bjørn E. (Journal article; Peer reviewed, 2017)Biomaterials based on peptide-coupled alginates must provide both optimal biological environments and tuneable stability/degradation profiles. The present work investigates the degradation pattern and kinetics of peptide-coupled ... -
Depolymerisation and Characterisation of Xanthans - A study of rheological and structural properties for Enhanced Oil Recovery
Holmvik, Christian (Master thesis, 2018)Xanthan is a polysaccharide which is commonly used as a thickening agent in e.g. sauces and toothpastes due to its viscosifying properties. The same attributes make it applicable for Enhanced Oil Recovery (EOR). With today's ... -
Dicarboxylated hyaluronate: Synthesis of a new, highly functionalized and biocompatible derivative
Münster, Lukáš; Capáková, Zdenka; Humpolíček, Petr; Kuřitka, Ivo; Christensen, Bjørn E.; Vícha, Jan (Peer reviewed; Journal article, 2022)Sequential periodate-chlorite oxidation of sodium hyaluronate to 2,3-dicarboxylated hyaluronate (DCH), a novel biocompatible and highly functionalized derivative bearing additional pair of single bondCOOH groups at C2 and ... -
Effects of carboxylation of the side chains on the order-disorder transition in aqueous solution of schizophyllan, a triple helical polysaccharide
Yoshiba, Kazuto; Okamoto, Satoka; Dobashi, Toshiaki; Oku, Hiroyuki; Christensen, Bjørn E.; Sato, Takahiro (Journal article; Peer reviewed, 2017)Schizophyllan and scleroglucan are water-soluble polysaccharides having repeating units consisting of three β-1,3-linked glucose residues in the main chain and a single β-1,6-linked glucose residue as the side chain. This ... -
Effects of physical and chemical treatments on the molecular weight and degradation of alginate-hydroxyapatite composites
Cardoso, DA; Ulset, Ann-Sissel Teialeret; Bender, Johan; Jansen, John A; Christensen, Bjørn E.; Leeuwenburgh, Sander (Journal article; Peer reviewed, 2014)Degradation of alginate remains a critical issue to allow predictable biological performance upon implantation of alginate-based materials. Therefore, the objective of the current study is to compare the effects of ... -
Efficient functionalization of alginate biomaterials
Dalheim, Marianne Øksnes; Vanacker, Julie; Najmi, Maryam A.; Aachmann, Finn Lillelund; Strand, Berit Løkensgard; Christensen, Bjørn E. (Journal article; Peer reviewed, 2016)Peptide coupled alginates obtained by chemical functionalization of alginates are commonly used as scaffold materials for cells in regenerative medicine and tissue engineering. We here present an alternative to the commonly ... -
Guluronate-b-dextran diblock polysaccharides
Johansen, Kaja Tunhøvd (Master thesis, 2019) -
Guluronate-Based Diblocks with β-(1,3)-Glucan: Ca2+ Induced Self-Assembly and Activation of the Glucan Corona for Ligand Attachment
Elvsaas, Julie (Master thesis, 2023)Blokkpolysakkarider, dannet ved å kombinere individuelle polysakkarider med et koblingsmolekyl, kan beholde sine distinkte egenskaper samtidig som de får nye karakteristikker. β-(1,3)-glukaner, kjent for sin bioktivitet, ...