Electron Microscopy of the Gel-forming Ability of Polysaccharide Food Additives(Food & Nutrition)

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概要

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• Water-insoluble polysaccharides such as curdlan, agar, carrageenan K and ι, and konjac glucomannan form gels when solutions obtained by heating them are cooled. Curdlan alone and konjac glucomannan with calcium hydroxide still remain as gels at a higher temperature. These polymers were found to form gels by neutralization of their alkanine solutions in the stationary state. Soluble and slimy polysaccharides in water such as carrageenan λ, screloglucan, succinoglycan, xanthan gum, pullulan and dextran are unable to form gels. Electron micrography showed that the gels were composed of long microfibrils of 50 Å to 250 Å width with interconnections, although the microfibrils of carrageenan ι were shorter, whereas the viscous solutions were composed of short microfibrils of about 10 Å to 20 Å width. The structures of the gels formed by heating were similar to those formed by neutralization, except in the case of curdlan gel. Dialyzed carrageenan K and its H-, K- and Na-forms had low or undetectable gel strength and were seen by electron micrography to be composed of short microfibrils. However, the presence of potassium ions in aqueous suspensions of the Na-form enhanced the gel strength and produced longer microfibrils. These results indicate that longer and or wider microfibrils are required for the formation of a gel.

• 社団法人日本農芸化学会の論文
• 1989-04-23

著者

• Harada T

  Kobe Women's University

• HARADA Akira

  Faculty of Integrated Arts and Sciences, Hiroshima University

• KANZAWA Yoshimi

  Kobe Women's University

• KOREEDA Atuo

  Institute of Scientific and Industrial Research, Osaka University

• HARADA Tokuya

  Kobe Women's University

• Harada Tokuya

  Kobe Women's University

• Koreeda Atuo

  Institute Of Scientific And Industrial Research Osaka University

• Harada A

  Department Of Macromolecular Science Graduate School Of Science Osaka University

• Kanzawa Yoshimi

  Kobe Women's University

• Harada Akira

  Faculty Of Integrated Arts And Sciences Hiroshima University

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