2013 Fiscal Year Final Research Report
Gelation Mechanism and Hydrogen Bonding Behavior of Gellan Gum Studied by Vibrational Spectroscopy and Small Angle X-ray Scattering
| Project/Area Number |
23550252
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Polymer/Textile materials
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| Research Institution | Kobe University (2012-2013)
Kwansei Gakuin University (2011) |
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Principal Investigator |
HARUMI Sato 神戸大学, 人間発達環境学研究科, 准教授 (10288558)
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| Co-Investigator(Kenkyū-buntansha) |
KUBOTA Kenji 群馬大学, 理工学研究科, 教授 (40153332)
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| Co-Investigator(Renkei-kenkyūsha) |
OZAKI Yukihiro 関西学院大学, 理工学部, 教授 (00147290)
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| Project Period (FY) |
2011 – 2013
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| Keywords | ゲル化 / 水素結合 / ジェランガム / 赤外分光法 / ラマン分光 / X線散乱 |
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| Research Abstract |
Gellan gum is an extracellular polysaccharide produced by Pseudomonas elodea, and is composed of tetrasaccharide (glucose, glucuronic acid, glucose, rhamnose) repeating units, containing one carboxyl side group. It is widely used in the food industry and biomedical fields since it forms transparent gels which have a heat and acid resistant nature. Gellan gum has the characteristic property of temperature-dependent and cation-induced gelation. This gelation involves the formation of double helical junction zones followed by the double helical segments of gellan gum to form a three-dimensional network by complexation with cations and hydrogen bonding with water. In the present study, we have investigated gelation mechanism of gellan gum by using infrared and Raman spectroscopy. It is likely that the hydrogen bonding between water and gellan gum becomes weak during the coil to double-helix transition.
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