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Effect of alkali treatment time and extraction time on agar from Gracilaria vermiculophylla

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Nineteenth International Seaweed Symposium

Part of the book series: Developments in Applied Phycology ((DAPH,volume 2))

Abstract

The effects of alkali treatment time and extraction time of native agar and alkali treated agar obtained from Gracilaria vermiculophylla were studied. The response characteristics were mainly agar yield and gel strength. Alkali-treatment was carried out at 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0 h. Agar yield and gel strength decreased with the increase in the time of the alkali-treatment. The highest yield (15.3%) and highest gel strength (1,064 g cm−2) were obtained at 0.5 h, and therefore this time was used for the next experiment. The extraction of both native and alkali treated agars was carried out at 1.5, 2.0, 2.5, and 3.0 h. The best extraction time for alkali treated agar was 1.5 h, and for native agar 2.5 h. The alkali treated agar obtained with the different alkali-treatment and extraction times showed higher melting (92.4–99.7°C) and gelling (35.7–39.6°C) temperatures. Native agar was lower in melting (60.2–64.1°C) and gelling (20.4–23.4°C) temperatures. The 3,6-anhydrogalactose content decreased with increasing alkali-treatment time, with the opposite effect during the extraction of native and alkali treated agars.

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Authors and Affiliations

  1. Departamento de Desarrollo de Tecnologías, Centro Interdisciplinario de Ciencias Marinas-IPN, Apdo. Postal 592, La Paz, B.C.S., México, 23000

    Dora Luz Arvizu-Higuera, Y. Elizabeth Rodríguez-Montesinos, J. Iván Murillo-Álvarez, Mauricio Muñoz-Ochoa & Gustavo Hernández-Carmona

Authors
  1. Dora Luz Arvizu-Higuera
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  2. Y. Elizabeth Rodríguez-Montesinos
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  3. J. Iván Murillo-Álvarez
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  4. Mauricio Muñoz-Ochoa
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  5. Gustavo Hernández-Carmona
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Corresponding author

Correspondence to Dora Luz Arvizu-Higuera .

Editor information

Editors and Affiliations

  1. School of Biological Sciences Algal Biotechnology, Murdoch University, Murdoch, WA, 6150, Australia

    Michael A. Borowitzka

  2. Acadian Seaplants Ltd., 30 Brown Avenue, Dartmouth, NS, B3B 1X8, Canada

    Alan T. Critchley

  3. Martin Ryan Institute, National University of Ireland, Galway, Ireland

    Stefan Kraan

  4. Bezhin Rosco, 28 Rue de Perharidy, 29680, Roscoff, France

    Akira Peters

  5. Department of Biology, University of Bergen, 5020, Bergen, Norway

    Kjersti Sjøtun

  6. Department of Marine Bioscience, Tokyo University of Marine Science & Technology, 4 Konan, Tokyo, Minato-ku, 108-8477, Japan

    Masahiro Notoya

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Arvizu-Higuera, D.L., Rodríguez-Montesinos, Y.E., Murillo-Álvarez, J.I., Muñoz-Ochoa, M., Hernández-Carmona, G. (2007). Effect of alkali treatment time and extraction time on agar from Gracilaria vermiculophylla . In: Borowitzka, M.A., Critchley, A.T., Kraan, S., Peters, A., Sjøtun, K., Notoya, M. (eds) Nineteenth International Seaweed Symposium. Developments in Applied Phycology, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-9619-8_9

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