| Determination of molecular weight of agars and effect of the molecular weight on the glass transition. | |
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MedLine Citation:
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PMID: 10563919 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A novel procedure to determine the molecular weight (MW) and MW distributions for various agars is described. The MW values of commercial agars, an agarose, an agaropectin, and hydrolyzed agaroses were determined by size exclusion chromatography-low angle laser light scattering, using 4.0 M guanidine hydrochloride as eluent to avoid gelation. The MW for the commercial agars was between 106 400 and 243 500 with polydispersity between 1.283 and 6. 600. The MW of the agarose separated from a commercial agar was lower than that of the agaropectin. To prepare agaroses with different MW values, the obtained agarose was hydrolyzed. The MW of the agarose decreased with hydrolysis time, and the polydispersity, on the contrary, increased. The glass transition temperature (T(g)) of agarose with different MW values and that of agaropectin were measured by differential scanning calorimetry. The T(g) of the agarose was higher than that of the agaropectin with higher MW. The T(g) of agarose increased with MW. |
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Authors:
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M Mitsuiki; A Mizuno; M Motoki |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of agricultural and food chemistry Volume: 47 ISSN: 0021-8561 ISO Abbreviation: J. Agric. Food Chem. Publication Date: 1999 Feb |
Date Detail:
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Created Date: 2000-09-12 Completed Date: 2000-09-12 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0374755 Medline TA: J Agric Food Chem Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 473-8 Citation Subset: IM |
Affiliation:
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Food Research and Development Laboratories, Ajinomoto Company, Inc., 1-1 Suzuki-cho, Kawasaki-ku, Kawasaki, Kanagawa, Japan. m_mitsuiki@mail.goo.ne.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Agar
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chemistry* Calorimetry, Differential Scanning Chemistry, Physical Molecular Weight Physicochemical Phenomena |
| Chemical | |
Reg. No./Substance:
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9002-18-0/Agar |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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