Trivalent Iron Induced Gelation in Lambda-Carrageenan |
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Authors: | Running Cordelia A Falshaw Ruth Janaswamy Srinivas |
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Affiliation: | a Whistler Center for Carbohydrate Research, Department of Food Science, 745 Agriculture Mall Drive, Purdue University, West Lafayette, IN 47907-2009, USA b 5 Mahana Place, Springfield, Rotorua, New Zealand |
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Abstract: | This communication reports gelation of lambda-carrageenan, for the first time, in the presence of trivalent iron ions. Kappa-, iota- and lambda-carrageenans are sulfated polysaccharides used extensively in food, pharmaceutical and medical applications. Kappa- and iota-carrageenans show gelation in the presence of mono- and di-valent ions, but lambda-carrageenan yields only viscous solutions. Our results show that gelation in lambda-carrageenan indeed is possible, but with trivalent ions. X-ray fiber diffraction patterns of iron (III)-lambda-carrageenan are characteristic of highly oriented and polycrystalline fibers containing well resolved Bragg reflections. The elastic modulus (G′) of the product is far greater than the loss modulus (G″) indicating the thermal stability of lambda-carrageenan in the presence of iron (III) ions. This novel finding has potential to expand lambda-carrageenan's current utility beyond a viscosifying agent. |
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Keywords: | Gelation Lambda-carrageenan Trivalent cations X-ray diffraction Sulfated polysaccharide |
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