Effect of calcium ions on the organization of iota-carrageenan helices: an X-ray investigation |
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Authors: | Janaswamy Srinivas Chandrasekaran Rengaswami |
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Institution: | Whistler Center for Carbohydrate Research, Food Science Building, Purdue University, West Lafayette, IN 47907-1160, USA. |
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Abstract: | X-ray fiber diffraction analysis confirms that calcium iota-carrageenan forms a threefold, right-handed, half-staggered, parallel, double helix of pitch 26.42 A stabilized by interchain hydrogen bonds. According to the detailed structural results, three helices are packed in a trigonal unit cell (a=23.61 and c=13.21 A). Strong interactions between the sulfate groups of neighboring helices, mediated by calcium ions and water molecules, are responsible for stabilizing the three-dimensional structure. |
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Keywords: | Iota-carrageenan X-ray diffraction Three-dimensional structure Junction zone |
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