Document Detail


Determination of molecular weight of agars and effect of the molecular weight on the glass transition.
MedLine Citation:
PMID:  10563919     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
M Mitsuiki; A Mizuno; M Motoki
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  47     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  1999 Feb 
Date Detail:
Created Date:  2000-09-12     Completed Date:  2000-09-12     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  473-8     Citation Subset:  IM    
Affiliation:
Food Research and Development Laboratories, Ajinomoto Company, Inc., 1-1 Suzuki-cho, Kawasaki-ku, Kawasaki, Kanagawa, Japan. m_mitsuiki@mail.goo.ne.jp
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MeSH Terms
Descriptor/Qualifier:
Agar / chemistry*
Calorimetry, Differential Scanning
Chemistry, Physical
Molecular Weight
Physicochemical Phenomena
Chemical
Reg. No./Substance:
9002-18-0/Agar

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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