Reexamining the Egg-Box Model in Calcium−Alginate Gels with X-ray Diffraction
The structure of the Ca−alginate junction zones was investigated with X-ray scattering on gels prepared with different methods. Fiber diffraction reveals the popular egg-box model may not be the only possible structure for the junction zones. The (001) reflection, which should be extinguished due to...
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| Veröffentlicht in: | Biomacromolecules 2007-02, Vol.8 (2), p.464-468 |
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| creator | Li, Liangbin Fang, Yapeng Vreeker, Rob Appelqvist, Ingrid Mendes, Eduardo |
| description | The structure of the Ca−alginate junction zones was investigated with X-ray scattering on gels prepared with different methods. Fiber diffraction reveals the popular egg-box model may not be the only possible structure for the junction zones. The (001) reflection, which should be extinguished due to 2/1 helical conformation in the egg-box model, was observed. This was further confirmed by the measurements on Ca−alginate gel beads prepared at different pH where large pieces were formed through a relatively slow process, which leads to a higher crystallinity and a more perfect ordering. The results suggest a 3/1 helical conformation is more proper for Ca−alginate gels formed slowly. This does not exclude the possibility for the 2/1 helical conformation in fast gelatinized Ca−alginate in which the 2/1 helix is a metastable form. Comparing the X-ray scattering results of the fresh, dehydrated, and rehydrated gels, a reversible aggregation of junction zones is found during dehydration and rehydration. The different stabilities of initial bonds and bonds formed during drying are speculated to be the contribution of MG block or short G blocks in the junction zones. |
| doi_str_mv | 10.1021/bm060550a |
| format | Article |
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Fiber diffraction reveals the popular egg-box model may not be the only possible structure for the junction zones. The (001) reflection, which should be extinguished due to 2/1 helical conformation in the egg-box model, was observed. This was further confirmed by the measurements on Ca−alginate gel beads prepared at different pH where large pieces were formed through a relatively slow process, which leads to a higher crystallinity and a more perfect ordering. The results suggest a 3/1 helical conformation is more proper for Ca−alginate gels formed slowly. This does not exclude the possibility for the 2/1 helical conformation in fast gelatinized Ca−alginate in which the 2/1 helix is a metastable form. Comparing the X-ray scattering results of the fresh, dehydrated, and rehydrated gels, a reversible aggregation of junction zones is found during dehydration and rehydration. The different stabilities of initial bonds and bonds formed during drying are speculated to be the contribution of MG block or short G blocks in the junction zones.</description><identifier>ISSN: 1525-7797</identifier><identifier>EISSN: 1526-4602</identifier><identifier>DOI: 10.1021/bm060550a</identifier><identifier>PMID: 17291070</identifier><language>eng</language><publisher>Washington, DC: American Chemical Society</publisher><subject>Alginates - chemistry ; Applied sciences ; Crystallization ; Exact sciences and technology ; Gels ; Glucuronic Acid - chemistry ; Hexuronic Acids - chemistry ; Hydrogen-Ion Concentration ; Models, Chemical ; Molecular Structure ; Natural polymers ; Physicochemistry of polymers ; Starch and polysaccharides ; X-Ray Diffraction - methods</subject><ispartof>Biomacromolecules, 2007-02, Vol.8 (2), p.464-468</ispartof><rights>Copyright © 2007 American Chemical Society</rights><rights>2007 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a343t-808691a5f818db1d3f7c0c349c6c91f45b67a9d4a086bc299d2bd077675ffd963</citedby><cites>FETCH-LOGICAL-a343t-808691a5f818db1d3f7c0c349c6c91f45b67a9d4a086bc299d2bd077675ffd963</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://pubs.acs.org/doi/pdf/10.1021/bm060550a$$EPDF$$P50$$Gacs$$H</linktopdf><linktohtml>$$Uhttps://pubs.acs.org/doi/10.1021/bm060550a$$EHTML$$P50$$Gacs$$H</linktohtml><link.rule.ids>314,776,780,2752,27053,27901,27902,56713,56763</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=18690500$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/17291070$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Li, Liangbin</creatorcontrib><creatorcontrib>Fang, Yapeng</creatorcontrib><creatorcontrib>Vreeker, Rob</creatorcontrib><creatorcontrib>Appelqvist, Ingrid</creatorcontrib><creatorcontrib>Mendes, Eduardo</creatorcontrib><title>Reexamining the Egg-Box Model in Calcium−Alginate Gels with X-ray Diffraction</title><title>Biomacromolecules</title><addtitle>Biomacromolecules</addtitle><description>The structure of the Ca−alginate junction zones was investigated with X-ray scattering on gels prepared with different methods. Fiber diffraction reveals the popular egg-box model may not be the only possible structure for the junction zones. The (001) reflection, which should be extinguished due to 2/1 helical conformation in the egg-box model, was observed. This was further confirmed by the measurements on Ca−alginate gel beads prepared at different pH where large pieces were formed through a relatively slow process, which leads to a higher crystallinity and a more perfect ordering. The results suggest a 3/1 helical conformation is more proper for Ca−alginate gels formed slowly. This does not exclude the possibility for the 2/1 helical conformation in fast gelatinized Ca−alginate in which the 2/1 helix is a metastable form. Comparing the X-ray scattering results of the fresh, dehydrated, and rehydrated gels, a reversible aggregation of junction zones is found during dehydration and rehydration. The different stabilities of initial bonds and bonds formed during drying are speculated to be the contribution of MG block or short G blocks in the junction zones.</description><subject>Alginates - chemistry</subject><subject>Applied sciences</subject><subject>Crystallization</subject><subject>Exact sciences and technology</subject><subject>Gels</subject><subject>Glucuronic Acid - chemistry</subject><subject>Hexuronic Acids - chemistry</subject><subject>Hydrogen-Ion Concentration</subject><subject>Models, Chemical</subject><subject>Molecular Structure</subject><subject>Natural polymers</subject><subject>Physicochemistry of polymers</subject><subject>Starch and polysaccharides</subject><subject>X-Ray Diffraction - methods</subject><issn>1525-7797</issn><issn>1526-4602</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNpt0L9OwzAQBnALgSgUBl4AeQGJIXBOYjseSykFqagSAoktchy7dZU_JU5E-wbMPCJPQqARZWC6G376TvchdELgkoBPrpIcGFAKcgcdEOozL2Tg7_7s1ONc8B46dG4BACII6T7qEe4LAhwO0PRR65XMbWGLGa7nGo9mM--6XOGHMtUZtgUeykzZJv98_xhkM1vIWuOxzhx-s_Ucv3iVXOMba0wlVW3L4gjtGZk5fdzNPnq-HT0N77zJdHw_HEw8GYRB7UUQMUEkNRGJ0oSkgeEKVBAKxZQgJqQJ41KkoWxdonwhUj9JgXPGqTGpYEEfnW9yl1X52mhXx7l1SmeZLHTZuJhFQjDgUQsvNlBVpXOVNvGysrms1jGB-Lu9-Le91p52oU2S63Qru7pacNYB6ZTM2qcLZd3WtU8BhT9OKhcvyqYq2i7-OfgFgImCag</recordid><startdate>20070201</startdate><enddate>20070201</enddate><creator>Li, Liangbin</creator><creator>Fang, Yapeng</creator><creator>Vreeker, Rob</creator><creator>Appelqvist, Ingrid</creator><creator>Mendes, Eduardo</creator><general>American Chemical Society</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20070201</creationdate><title>Reexamining the Egg-Box Model in Calcium−Alginate Gels with X-ray Diffraction</title><author>Li, Liangbin ; Fang, Yapeng ; Vreeker, Rob ; Appelqvist, Ingrid ; Mendes, Eduardo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a343t-808691a5f818db1d3f7c0c349c6c91f45b67a9d4a086bc299d2bd077675ffd963</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2007</creationdate><topic>Alginates - chemistry</topic><topic>Applied sciences</topic><topic>Crystallization</topic><topic>Exact sciences and technology</topic><topic>Gels</topic><topic>Glucuronic Acid - chemistry</topic><topic>Hexuronic Acids - chemistry</topic><topic>Hydrogen-Ion Concentration</topic><topic>Models, Chemical</topic><topic>Molecular Structure</topic><topic>Natural polymers</topic><topic>Physicochemistry of polymers</topic><topic>Starch and polysaccharides</topic><topic>X-Ray Diffraction - methods</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Li, Liangbin</creatorcontrib><creatorcontrib>Fang, Yapeng</creatorcontrib><creatorcontrib>Vreeker, Rob</creatorcontrib><creatorcontrib>Appelqvist, Ingrid</creatorcontrib><creatorcontrib>Mendes, Eduardo</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Biomacromolecules</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Li, Liangbin</au><au>Fang, Yapeng</au><au>Vreeker, Rob</au><au>Appelqvist, Ingrid</au><au>Mendes, Eduardo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Reexamining the Egg-Box Model in Calcium−Alginate Gels with X-ray Diffraction</atitle><jtitle>Biomacromolecules</jtitle><addtitle>Biomacromolecules</addtitle><date>2007-02-01</date><risdate>2007</risdate><volume>8</volume><issue>2</issue><spage>464</spage><epage>468</epage><pages>464-468</pages><issn>1525-7797</issn><eissn>1526-4602</eissn><abstract>The structure of the Ca−alginate junction zones was investigated with X-ray scattering on gels prepared with different methods. Fiber diffraction reveals the popular egg-box model may not be the only possible structure for the junction zones. The (001) reflection, which should be extinguished due to 2/1 helical conformation in the egg-box model, was observed. This was further confirmed by the measurements on Ca−alginate gel beads prepared at different pH where large pieces were formed through a relatively slow process, which leads to a higher crystallinity and a more perfect ordering. The results suggest a 3/1 helical conformation is more proper for Ca−alginate gels formed slowly. This does not exclude the possibility for the 2/1 helical conformation in fast gelatinized Ca−alginate in which the 2/1 helix is a metastable form. Comparing the X-ray scattering results of the fresh, dehydrated, and rehydrated gels, a reversible aggregation of junction zones is found during dehydration and rehydration. The different stabilities of initial bonds and bonds formed during drying are speculated to be the contribution of MG block or short G blocks in the junction zones.</abstract><cop>Washington, DC</cop><pub>American Chemical Society</pub><pmid>17291070</pmid><doi>10.1021/bm060550a</doi><tpages>5</tpages></addata></record> |
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| subjects | Alginates - chemistry Applied sciences Crystallization Exact sciences and technology Gels Glucuronic Acid - chemistry Hexuronic Acids - chemistry Hydrogen-Ion Concentration Models, Chemical Molecular Structure Natural polymers Physicochemistry of polymers Starch and polysaccharides X-Ray Diffraction - methods |
| title | Reexamining the Egg-Box Model in Calcium−Alginate Gels with X-ray Diffraction |
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