{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,14]],"date-time":"2026-01-14T01:01:24Z","timestamp":1768352484930,"version":"3.49.0"},"reference-count":32,"publisher":"AIP Publishing","issue":"5","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2006,8,7]]},"abstract":"<jats:p>Scleroglucan is a (1,3)-\u03b2-D-glucan polysaccharide produced by the fungus Sclerotium. Dissolved in water at room temperature it adopts a linear, rigid, triple helical structure. Gelation of scleroglucan can be obtained by Schiff-base formation between partly periodate oxidized scleroglucan and the primary amine groups of chitosan. The scleraldehyde-chitosan gels exhibit a collapse transition when exposed to volume fractions of isopropanol, Wp, larger than 65%. The aim of the present study is to provide structural information concerning the local polymer distribution and the collapse transition in (1,3)-\u03b2-D-glucan-chitosan gels. Small angle x-ray scattering was used to investigate solutions and gels of scleroglucan in water, as well as in an aqueous mixture containing 65% isopropanol. The results reveal that in aqueous solution, the polysaccharide scleroglucan chains have an approximately cylindrical cross section of external diameter close to 17\u00c5. The gels display the same local structure, but form clusters on a longer distance scale. For the collapsed gels in the water-isopropanol mixture, partial phase separation occurs in which ordered domains of approximate size of 110\u00c5 develop. This study indicates that local ordering in liquid-crystalline-type domains is a possible molecular mechanism contributing to the collapse of gels composed of semiflexible polymers. The triple helical structure of the molecule appears not to be conserved in the majority phase in this solvent, but it is conserved in the liquid crystalline domains.<\/jats:p>","DOI":"10.1063\/1.2234476","type":"journal-article","created":{"date-parts":[[2006,8,5]],"date-time":"2006-08-05T01:35:36Z","timestamp":1154741736000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":9,"title":["Small angle x-ray scattering study of local structure and collapse transition of (1,3)-\u03b2-D-glucan-chitosan gels"],"prefix":"10.1063","volume":"125","author":[{"given":"Marit","family":"Sletmoen","sequence":"first","affiliation":[{"name":"The Norwegian University of Science and Technology Biophysics and Medical Technology, Department of Physics, , NTNU, NO-7491 Trondheim, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bj\u00f8rn T.","family":"Stokke","sequence":"additional","affiliation":[{"name":"The Norwegian University of Science and Technology Biophysics and Medical Technology, Department of Physics, , NTNU, NO-7491 Trondheim, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Erik","family":"Geissler","sequence":"additional","affiliation":[{"name":"Universit\u00e9 Joseph Fourier de Grenoble Laboratoire de Spectrom\u00e9trie Physique, CNRS UMR 5588, , BP 87, 38402 Saint Martin d\u2019H\u00e8res Cedex, France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2006,8,4]]},"reference":[{"key":"2023073120272074200_c1","doi-asserted-by":"crossref","first-page":"185","DOI":"10.3109\/07388559609147421","volume":"16","year":"1996","journal-title":"Crit. 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