Karntarat WuttiselaWannapong TriampoDarapond TriampoMahidol UniversityCenter of Excellence for Vectors and Vector-Borne DiseasesCenter of Excellence for Innovation in Chemistry2018-09-132018-09-132009-01-01International Journal of Biological Macromolecules. Vol.44, No.1 (2009), 86-91014181302-s2.0-57849100670https://repository.li.mahidol.ac.th/handle/123456789/27323Surface chemical microstructure of hydrochloric acid hydrolyzed tapioca starch producing different amylose:amylopectin (Am:Ap) ratios were studied with scanning chemical force microscopy (CFM). The chemical force probes were functionalized of two types with -OH (phosphate specific) and -CH3(carbon specific). Lateral force trace-minus-retrace (TMR) images from -OH and -CH3probes revealed changes in the phosphate domains and the carbon backbone for the varying acid hydrolyzed tapioca starch compared to that of the native tapioca starch. Scanning electron micrographs (SEM) showed different degree of the granule surface disruption before and after hydrolysis. The exterior structures of the acid hydrolyzed starch granules were chemically investigated with CFM to study the relationships of the surface molecular structures and the Am:Ap ratios. © 2008 Elsevier B.V. All rights reserved.Mahidol UniversityBiochemistry, Genetics and Molecular BiologyArticleSCOPUS10.1016/j.ijbiomac.2008.10.005