These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Development of a novel formula for estimating the amylose content of starch using japonica milled rice flours based on the iodine absorption curve.
    Author: Nakamura S, Yamaguchi H, Benitani Y, Ohtsubo K.
    Journal: Biosci Biotechnol Biochem; 2020 Nov 01; 84(11):2347-2359. PubMed ID: 32693694.
    Abstract:
    The apparent amylose content (AAC) is usually measured by an iodine colorimetric method using the starch as a sample. Nevertheless, it is time-consuming and labor-intensive to prepare rice starch. Therefore, we compared two methods, starch method and milled rice flour method. The former AACs were higher than the latter and correlated with pasting properties, physical properties and sensory scores better than the latter. Therefore, we developed a novel formula for estimating the AACs of starches from japonica rice cultivars using milled rice flours instead of using rice starch. The correlation coefficients of the new formula were 0.89 for calibration and 0.94 for validation, which showed that this equation can be applied to unknown japonica rice samples, and will lead to easy, rapid, and accurate iodine method to determine rice AACs using milled rice flours instead of starch. Abbreviations: AAC: apparent amylose content; RS: resistant starch; SLC: super-long chain; CD: chain length distribution; RVA: Rapid Visco Analyzer; SB: setback; BD: breakdown; Max.vis: maximum viscosity; Min.vis: minimum viscosity; Pt: pasting temperature; Cons: consistency; Final.vis: Final viscosity; SB/Cons: setback/consistency; Max/Min: maximum viscosity/minimum viscosity; Max/Fin: maximum viscosity/final viscosity.
    [Abstract] [Full Text] [Related] [New Search]