Browsing NTNU Open by Author "Christensen, Bjørn E."
Now showing items 21-38 of 38
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Hydrazide Conjugated Oligoguluronates
Solberg, Amalie (Master thesis, 2017)Advances reported in the field of amphiphilic block copolymers in recent years has demonstrated that predetermined structures can be formed from the self-organizing of amphiphilic molecules at interfaces or in solutions. ... -
Influence of amino acids, buffers, and pH on the γ-irradiation-induced degradation of alginates
Ulset, Ann-Sissel Teialeret; Mori, Hideki; Dalheim, Marianne Øksnes; Hara, Masayuki; Christensen, Bjørn E. (Journal article; Peer reviewed, 2014)Alginate-based biomaterials and medical devices are commonly subjected to γ-irradiation as a means of sterilization, either in the dry state or the gel (hydrated) state. In this process the alginate chains degrade randomly ... -
Macromolecular acidic coating increases shelf life by inhibition of bacterial growth
Christensen, Bjørn E.; Strand, Sabina P.; Basset, Coraline; Kristiansen, Kåre Andre; Ulset, Ann-Sissel Teialeret; Ballance, Simon; Granum, Per Einar (Journal article; Peer reviewed, 2018)The sensitivity of microorganisms to low pH can be utilized in food protection by preparing coatings based on macromolecular acids. Due to limited diffusivity of macromolecules low pH occurs primarily at the surface, while ... -
Periodate oxidation and macromolecular compaction of hyaluronan
Kristiansen, Kåre Andre; Dalheim, Marianne Øksnes; Christensen, Bjørn E. (Journal article; Peer reviewed, 2013)Partial periodate oxidation of hyaluronan leads to ring opening of the 4-linked D-glucuronate (GlcA) residues, providing a particularly flexible element within otherwise semi-flexible chains. This leads to compaction of ... -
Periodate oxidation of alginate-b-dextran diblocks for ligand attachment
Tollefsen, Ingrid L. (Master thesis, 2023)Diblokker, som alginat-b-dekstran, kan sammen med radionuklider danne nanopartikler i stand til å strålebehandle kreft. Tradisjonell strålebehandling skader friskt vev på vei gjennom kroppen, mens nanopartiklene kan sendes ... -
Preparation and Characterisation of Hydrophobically Modified Xanthan
Jenssen, Ina Beate (Master thesis, 2014)Xanthan is a polysaccharide widely used in food, cosmetics, and enhanced oil recovery (EOR) by polymer flooding. In polymer flooding addition of polymers increases the viscosity of the injection water used for oil extraction ... -
Preparation of Activated Chitosan and Synthesis of a Chitosan-Dextran Diblock
Pedersen, Jesper Evjen (Master thesis, 2020)Blokk-kopolymerer (BKPer) er hybride strukturer bestående av kovalent bundne polymer-segmenter. Et overveid valg av bestående blokker tillater laging av nye materialer med skreddersydde egenskaper. Av spesiell interesse ... -
Preparation, characterization, and solution properties of chitosan-b-dextran diblocks
Gravdahl, Mina (Master thesis, 2021)Målet med denne masteroppgaven var å lage og karakterisere av kitosan-b-dekstran-diblokker og undersøke deres egenskaper i løsning. Det er kjent at løseligheten til kitosan-oligomerer med lav FA er sterkt avhengig av pH i ... -
Self-assembling alginate-based diblock polymers
Solberg, Amalie (Doctoral theses at NTNU;2022:49, Doctoral thesis, 2022)Polysaccharides are an abundant, diverse, and naturally occurring class of biopolymers. Alginate is a marine polysaccharide from brown algae and some bacterial species. Industrially, alginates are widely applied for the ... -
Single-chain conformation of carboxylated schizophyllan, a triple helical polysaccharide, in dilute alkaline aqueous solution
Tomifuji, Yu; Yoshiba, Kazuto; Christensen, Bjørn E.; Terao, Ken (Journal article; Peer reviewed, 2019)Synchrotron-radiation small-angle X-ray scattering measurements were carried out for a schizophyllan (SPG) sample with the weight-average molar mass Mw of 340 kg mol−1 and five carboxylated SPG (sclerox) samples with ... -
Sterilization effects on the handling and degradation properties of calcium phosphate cements containing poly (D,L-lactic-co-glycolic acid) porogens and carboxymethyl cellulose
Kucko, Nathan W.; Li, Wenliang; Martinez, Marcela A. Garcia; Rehman, Ihtesham ur; Ulset, Ann-Sissel Teialeret; Christensen, Bjørn E.; Leeuwenburgh, Sander C.G.; Herber, Ralf-Peter (Peer reviewed; Journal article, 2019)Injectable, self‐setting calcium phosphate cements (CPCs) are synthetic bone substitutes considered favorable for the repair and regeneration of bone due to their osteocompatibility and unique handling properties. However, ... -
Structural and functional aspects of mannuronic acid–specific PL6 alginate lyase from the human gut microbe Bacteroides cellulosilyticus
Stender, E.G.P.; Andersen, C.D.; Fredslund, F.; Holck, J.; Solberg, Amalie; Teze, D.; Peters, G.H.J.; Christensen, Bjørn E.; Aachmann, Finn Lillelund; Welner, D.H.; Svensson, B. (Journal article; Peer reviewed, 2019)Alginate is a linear polysaccharide from brown algae consisting of 1,4-linked β-D-mannuronic acid (M) and α-L-guluronic acid (G) arranged in M, G, and mixed MG blocks. Alginate was assumed to be indigestible in humans, but ... -
Towards block polysaccharides: Terminal activation of chitin and chitosan oligosaccharides by dioxyamines and dihydrazides and the preparation of block structures
Mo, Ingrid Vikøren (Doctoral theses at NTNU;2021:120, Doctoral thesis, 2021)Polysaccharides are highly abundant and due to the large variation in chemical compositions, they possess a range of intrinsic properties, biological functions, and industrial applications. In the context of block copolymers, ... -
Towards Dextran-Based Block Polysaccharides
Haarberg, Odin Weberg (Master thesis, 2018)Carbohydrates covalently linked with other chemical species are termed glycoconjugates. They are important compounds in biology, and are involved in many processes, such as cell-cell interactions. Glycoconjugates can be ... -
Towards Polysaccharide Origami: Preparation of Chitooligosaccharide-Dihydrazide Hybrids
Mo, Ingrid Vikøren (Master thesis, 2015)The recent development of DNA origami shows that biopolymers can form a variety of predetermined nanostructures of considerable sophistication. A corresponding development of polysaccharide origami based on a modular ... -
Transition-Metal Nanoparticle Catalysts Anchored on Carbon Supports via Short-Chain Alginate Linkers
Tafjord, Joakim; Holmen, Anders; Rytter, Erling; Myrstad, Rune; Svenum, Ingeborg-Helene; Christensen, Bjørn E.; Yang, Jia (Journal article; Peer reviewed, 2021)This study reports a green, inexpensive, and highly versatile procedure to synthesize well-dispersed transition-metal nanoparticles anchored on carbon supports. The resulting metal loadings are 26 wt % or above. Achieving ... -
β-(1,3)-glucan-b-chitosan and β-(1,3)-glucan-b-biotin diblocks: Preparation, purification, and characterisation
Eidhammer, Celine E. (Master thesis, 2022)Målet med denne masteroppgaven var å forberede SBG-b-kitosan og SBG-b-biotin diblokker, inkludert fremstilling og rensing av SBG-oligomerer. Polysac- karider kommer fra naturlig rssurser og er ikke-giftige, biokompatible ... -
β-1,3-glucan and β-1,3-glucan-based diblock polysaccharides: Preparation, characterization, and solution behavior
Kristoffersen, Hilde (Master thesis, 2021)𝛽-glukaner er en av de mest rapporterte biologisk aktive polysakkaridene og anses å ha et stort potensial i ulike industrier. Et vannløselig preparat av 𝛽-1,3-glukan med forgreninger koblet via 1,6-bindinger (SBG), ...