| Comparative studies on the conformational change and aggregation behavior of irradiated carrageenans and agar by dynamic light scattering. | |
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MedLine Citation:
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PMID: 17977594 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The conformational associative properties of kappa-, iota-, and lambda-carrageenan and agar with irradiation dose were studied by dynamic light scattering. The random scission of the carrageenans and agar by gamma irradiation resulted in the formation of polydispersed lower molecular weight fragments. At high doses, the system moves towards uniformity. Conformational change from coil to helix was observed in all carrageenans and agar at doses up to 100 kGy. The conformational change in lambda-carrageenan may be due to the irregular and hybrid structure of this polysaccharide. Only agar and lambda-carrageenan still undergo conformational transition at a high dose of 200 kGy. Gelation is observed for kappa-, iota-carrageenan up to a dose of 50 kGy while gelation is still observed at 100 kGy for agar. Increase in the hydrodynamic radius with decreasing temperatures for the non-irradiated carrageenans follows this order: lambda-carrageenan>kappa-carrageenan>iota-carrageenan. Slight increases in hydrodynamic radius were observed with irradiation. |
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Authors:
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Lucille Abad; Satoshi Okabe; Mitsuhiro Shibayama; Hisaaki Kudo; Seiichi Saiki; Charito Aranilla; Lorna Relleve; Alumanda de la Rosa |
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Publication Detail:
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Type: Comparative Study; Journal Article Date: 2007-09-18 |
Journal Detail:
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Title: International journal of biological macromolecules Volume: 42 ISSN: 0141-8130 ISO Abbreviation: Int. J. Biol. Macromol. Publication Date: 2008 Jan |
Date Detail:
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Created Date: 2007-12-10 Completed Date: 2008-04-03 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7909578 Medline TA: Int J Biol Macromol Country: England |
Other Details:
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Languages: eng Pagination: 55-61 Citation Subset: IM |
Affiliation:
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Philippine Nuclear Research Institute, Commonwealth Ave., Diliman, Quezon City, Philippines. lvabad@pnri.dost.gov.ph |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Agar
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chemistry*,
radiation effects* Carbohydrate Conformation / radiation effects Carbohydrate Sequence Carrageenan / chemistry*, radiation effects* Gamma Rays Light Molecular Sequence Data Scattering, Radiation Temperature |
| Chemical | |
Reg. No./Substance:
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9000-07-1/Carrageenan; 9002-18-0/Agar |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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