The DOI matches its Crossref record; 13 of the 13 references it cites were found in a registry or an index.
Evidence for Egg-Box-Compatible Interactions in Calcium−Alginate Gels from Fiber X-ray Diffraction
Open accessAbstract
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. (Biopolymers 1973, 12, 1865) and contradicts a repeat of 0.78 nm recently suggested by Li et al. (Biomacromolecules 2007, 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.
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Cites
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Egg-box model-based gelation of alginate and pectin: A review
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Metadata
- Authors
- Sikorski, P., Mo, F., Skjåk-Bræk, G., & Stokke, B. T.
- Venue
- Biomacromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2007-05-27
- Volume
- 8
- Issue
- 7
- Pages
- 2098-2103
- ISSN
- 1525-7797 (ISSN-L)
- 1526-4602
- OpenAlex
- W2094100188
- Cited by
- 503
- References
- 13
- FWCI
- 14.92
- Type
- journal article
- Language
- en
- Open access
- green
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