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United States Department of Agriculture

Agricultural Research Service

Research Project: New Sustainable Processing Technologies to Produce Healthy, Value-Added Foods from Specialty Crops and their Co-Products

Location: Healthy Processed Foods Research

Title: Two alternative methods to predict amylose content in rice grain by using tristimulus CIELAB values and developing a specific color board of starch-iodine complex solution

Authors
item Ronoubigowa, Ambouroue -
item Pan, Zhongli
item Wada, Yoshiharu -
item Tomohiko, Yoshida -

Submitted to: Journal of Plant Production Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: August 19, 2010
Publication Date: May 1, 2011
Citation: Ronoubigowa, A., Pan, Z., Wada, Y., Tomohiko, Y. 2011. Two alternative methods to predict amylose content in rice grain by using tristimulus CIELAB values and developing a specific color board of starch-iodine complex solution. Journal of Plant Production Science. 14(2):164-168.

Interpretive Summary: The research showed that L*a*b* (chroma meter) values can be used to determine amylose content in rice as substitute to absorbance (spectrophotometer). A specific color board was created to characterize amylose-iodine solution, for estimating and classifying the amylose content in rice.

Technical Abstract: Amylose content was predicted by measuring tridimensional L*a*b* values in starch-iodine solutions and building a regression model. The developed regression model showed a highly significant relationship (R2= 0.99) between the L*a*b values and the amylose content. Apparent amylose content was strongly and negatively correlated with L*a*b* values. This method could be used to predict amylose content in rice. The conversion of L*a*b* values to RGB values and to color hexadecimal codes allowed reproducing the colors of starch-iodine solution and making an explicit color board. From this specific color board, entries could be assorted in their respective classes and their apparent amylose content could be easily estimated.

Last Modified: 4/18/2014