%0 Journal Article
%T AMYLOSE/AMYLOPECTIN SIMPLE DETERMINATION IN ACID HYDROLYZED TAPIOCA STARCH
%A KARNTARAT WUTTISELA
%A SUJIN SHOBSNGOB
%A WANNAPONG TRIAMPO
%A DARAPOND TRIAMPO
%J Journal of the Chilean Chemical Society
%D 2008
%I Sociedad Chilena de Qu¨ªmica
%X Analysis of the shift of wavelength m¨¢ximum using a rapid colorimetric method was used to determine the ratio of amylose:amylopectin (Am:Ap) in acid-hydrolyzed tapioca starch. The absorbance m¨¢ximum of 600 nm (Am:Ap of tapioca starch ¡Ö 22:78) moved to shorter wavelengths (590, 585, 570, 560, and 534 nm) as the decrease of the Am:Ap ratio due to hydrolysis of shorter chains that are not be able to form a complex with iodine. The amount of amylopectin itself may be unaltered or slightly decreased but the decrease in amylose caused a decrease in Am:Ap ratio
%K amylose
%K amylopectin
%K acid hydrolysis
%K colorimetric
%U http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072008000300002