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KMID : 1007520030120060700
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Food Science and Biotechnology
2003 Volume.12 No. 6 p.700 ~ p.704
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The Channels of Starch Granules
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Fannon, John E.
Gray, Jonathan A./Gunawan, Ninik/Huber, Kerry C./BeMiller, James N.
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Abstract
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Pores were observed on maize (corn), sorghum and millet starch granules and hypothesized to be openings to channels that provide access to the granule interior. Later, the existence of channels was established unequivocally, and clear evidence that channels in corn and sorghum starch granules connect an internal cavity and the external environment was presented. It was found that flow of reagents into the matrix of corn and sorghum starch granules occurred primarily from channels and the cavity. Granular reaction patterns were observed by converting derivatives into thallium salts and locating the thallium ions by compositional backscattered electron imaging. A different, but similar, and simpler technique for locating the position of reaction has been developed. It involves conversion of derivatizing groups into silver salts, reduction of the silver ions to silver atoms, and locating the silver atoms by reflectance confocal laser scanning microscopy. Use of this method confirmed that highly reactive reagents react primarily on or near granule surfaces, primarily the surfaces of channels and the cavity, while less reactive reagents diffuse throughout the granule matrix before reacting.
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