Surface Deposits on Glucomannan Granules in Polished Konjac Flours

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  • こんにゃく精粉におけるグルコマンナン粒子表面の付着物
  • コンニャク セイフン ニ オケル グルコマンナン リュウシ ヒョウメン ノ フチャクブツ

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Abstract

<p>The purpose of this study was to clarify the origin of deposits observed on the surface of glucomannan (GM) granules in polished konjac flour samples. Konjac flour was immersed in an ethanol solution of appropriate concentration, stained with methylene blue, and then microscopically observed. Stained materials were observed on the surface of slightly swollen granules exposed to the ethanol solution. Some of the granule surfaces exhibited a “patchwork pattern”, where the portion corresponding to the seam of the patch was darkly stained. Depending on the granule, various types of patches were observed apart and attached. In addition, the granules with patchwork patterns or patches were damaged in streaks. Staining of the adhered matter is thought to be mainly due to the presence of cell walls and the middle lamella containing pectin. It was concluded that the surface of GM granules in konjac flours might have contained parts or fragments of cell walls or the middle lamella, which originally surrounded the GM granules in the konjac corm and were partially damaged or destroyed during mechanical processing.</p>

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