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Preparation of Alginic Acid and Metal Alginate from Algae and their Comparative Study

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Abstract

Alginic acid and metal alginates are prepared from fresh algae using extraction method. A FTIR spectrum indicates that alginic acid is converted into the metal alginate. Comparing calcium and cobalt alginates, asymmetric stretching of free carboxyl group of calcium alginate at 1630 cm−1 is shifted to 1585 cm−1 in cobalt alginate, due to the change of charge density, radius and atomic weight of the cation, creating a new environment around the carbonyl group. The strong exothermic peak of alginic acid in DSC thermogram indicates the decomposition of biopolymer, whereas strong exothermic peak of metal alginate in DSC thermogram attributed to the decomposition of biopolymer and formation of respective carbonate. Based on DSC study, the decomposition of cobalt alginate occurs at higher temperature comparing to those of sodium and calcium alginate, which may conclude into the higher stability of cobalt alginate. TGA results reveal that, cobalt alginate is more stable than calcium and sodium alginate at 300 °C temperature. Surface morphology (at same magnification), as well as porosity (%) and pore size distribution results change with metals present in different metal alginates.

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Acknowledgment

Financial support from KIMST (2007) is duly acknowledged.

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Authors and Affiliations

  1. Department of Chemistry, Yonsei University, Wonju, 220-710, South Korea

    Tara Sankar Pathak, Jin San Kim & Ki-Jung Paeng

  2. Department of Materials Engineering, Kyungsung University, Busan, 608-736, South Korea

    Se-Jong Lee

  3. Department of Chemistry, Hanseo University, Seosan, 352-820, South Korea

    Dae-Jin Baek

Authors
  1. Tara Sankar Pathak
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  2. Jin San Kim
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  3. Se-Jong Lee
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  4. Dae-Jin Baek
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  5. Ki-Jung Paeng
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Correspondence to Ki-Jung Paeng.

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Pathak, T.S., Kim, J.S., Lee, SJ. et al. Preparation of Alginic Acid and Metal Alginate from Algae and their Comparative Study. J Polym Environ 16, 198–204 (2008). https://doi.org/10.1007/s10924-008-0097-4

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  • DOI: https://doi.org/10.1007/s10924-008-0097-4

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