2021 Fiscal Year Final Research Report
Control of structures and properties of multi-helical polysaccharides by using rewinding of the helices
| Project/Area Number |
19H02773
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 35020:Polymer materials-related
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| Research Institution | Shizuoka University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
吉場 一真 群馬大学, 大学院理工学府, 助教 (40375564)
田坂 茂 静岡大学, 工学部, 教授 (10134793)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 多重らせん多糖類 / 増粘剤 / キサンタン / 再性 |
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| Outline of Final Research Achievements |
Xanthan is a double helical polysaccharide widely used as a viscosity enhancer. The double helix of xanthan can be unwound (denaturation) into single chains by heating its solution, and rewound (renaturation) by cooling. Xanthan has been used in products for foods, cosmetics. In these products, various chemicals are contained in the aqueous solution. In this study, the conformation of xanthan in aqueous solution after the denaturation and renaturation was investigated by changing solvent conditions, pH and salts, and/or adding additives, such as citric acid or urea. The molar mass of xanthan was changed by denaturation and renaturation, which suggests that the chain aggregates in the citric acid solution and dissociation of xanthan in the urea solution were formed respectively after the denaturation and renaturation processes.
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| Free Research Field |
高分子物理化学
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| Academic Significance and Societal Importance of the Research Achievements |
キサンタンは食品や化粧品など様々な製品の粘度を調整するために使用されている。それらの製品の製造、使用過程において加熱・冷却される機会は少なくないので、変性・再性に伴うキサンタンの構造・物性の変化を知ることは、単にらせん高分子の構造変化を知ると言う、学術的興味に留まらず、実用面でも重要である。
また、変性前の構造に関して、比較的詳しく調べられているキサンタンに対して、変性・再性に伴う構造・物性変化を解析する手法を確立すれば、他のらせん多糖類・高分子に関して、らせんの巻き戻しによる構造変化を明らかにするモデルケースとなり得る。
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