Abstract：
:Images of high methoxyl orange pectin deposited from solution and high methoxyl sugar acid gels (HMSAG) were obtained by atomic force microscopy (AFM) in the tapping mode. For the first time, images of pectin deposited from water revealed that the transition from pectin networks to individual molecules or aggregates thereof occurred at concentrations between 6.5 and 13.1 microg/mL. At 6.5 microg/mL, shapes included rods, segmented rods, kinked rods, rings, branched molecules, and dense circular areas. At 13.1 microg/mL, all of these shapes were integrated into networks. These same structures were discernible in pectin high methoxyl sugar acid gels. Thus one might consider pectin networks in water at concentrations in excess of 10 microg/mL to be separate fluid precursors of networks in high methoxyl sugar acid gels. Examination of AFM images revealed that gels with "uniform" distribution of strands and pores between strands had higher gel strengths as measured by a penetrometer than gels in which strands were nonuniformly distributed and were separated by large and small spaces.
journal_name
Biomacromoleculesjournal_title
Biomacromoleculesauthors
Fishman ML,Cooke PH,Chau HK,Coffin DR,Hotchkiss AT Jrdoi
10.1021/bm0607729subject
Has Abstractpub_date
2007-02-01 00:00:00pages
573-8issue
2eissn
1525-7797issn
1526-4602journal_volume
8pub_type
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