dc.contributor.author | Sikorski, Pawel | |
dc.contributor.author | Mo, Frode | |
dc.contributor.author | Skjåk-Bræk, Gudmund | |
dc.contributor.author | Stokke, Bjørn Torger | |
dc.date.accessioned | 2024-03-14T09:52:29Z | |
dc.date.available | 2024-03-14T09:52:29Z | |
dc.date.created | 2007-08-20T13:21:51Z | |
dc.date.issued | 2007 | |
dc.identifier.citation | Biomacromolecules. 2007, 8 2098-2103. | en_US |
dc.identifier.issn | 1525-7797 | |
dc.identifier.uri | https://hdl.handle.net/11250/3122346 | |
dc.description.abstract | The structures of guluronic-acid-rich alginate in the acid and calcium forms were investigated using fiber X-ray diffraction. Data recorded for alginate fibers in the acid form show a repeat along the chain axis of c = 0.87 nm, a value that is in agreement with the one measured by Atkins et al. (Biopolymers1973, 12, 1865) and contradicts a repeat of 0.78 nm recently suggested by Li et al. (Biomacromolecules2007, 8, 464). In the Ca2+ form, our observations indicate that the junction zone involves dimerization of polymer chains through Ca2+ coordination according to the egg-box model. For reasons that are not understood at present, coordination of the divalent cations reduces the ability for the lateral crystallographic packing of the dimers. A proposed model for the junction zone involves polymer chains packed on a hexagonal lattice with a lattice constant a = 0.66 nm. Random pairs of chains form dimers through coordination of Ca2+ cations. Further lateral interaction between dimers is mediated by disordered Na+ and Ca2+ cations, water molecules, and hydrogen bonding. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | ACS Publications | en_US |
dc.title | Evidence for egg-box-compatible interactions in calcium-alginate gels from fiber X-ray diffraction | en_US |
dc.title.alternative | Evidence for egg-box-compatible interactions in calcium-alginate gels from fiber X-ray diffraction | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | acceptedVersion | en_US |
dc.rights.holder | Copyright © 2007 American Chemical Society | en_US |
dc.source.pagenumber | 2098-2103 | en_US |
dc.source.volume | 8 | en_US |
dc.source.journal | Biomacromolecules | en_US |
dc.identifier.doi | 10.1021/bm0701503 | |
dc.identifier.cristin | 371561 | |
cristin.ispublished | true | |
cristin.fulltext | postprint | |
cristin.qualitycode | 1 | |