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Sonication and grinding pre-treatments on Gelidium amansii seaweed for the extraction and characterization of Agarose

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Abstract

Various pretreatments methods including sonication and grinding were performed on red seaweed Gelidium amansii for the subsequent extraction of agarose. The agarose products are usually extracted from agar powder products from seaweeds. In this study, the agarose was extracted using a direct polyethylene glycol (PEG) method without the need to first process the agar from seaweed. The agar extract was frozen then thawed and mixed directly with PEG solution to precipitate the agarose. The quality of agarose obtained was evaluated through physico-chemical properties analysis which includes spectral technique (FTIR), melting and boiling point, gel strength and sulfate content. These properties were compared with a non-pretreated sample and it was found that the addition of pretreatment steps improved the quality of agarose but gave a slightly lower yield. The gel strength of pretreated samples was much higher and the sulfate content was lower compared to non-pretreated samples. The best pretreatment method was sonication which gave gel strength of 742 g cm-2 and sulfate content of 0.63%. The extraction of agarose can be further improved with the use of different neutralizing agents. Pretreating the seaweed shows potential in improving the quality of agarose from seaweed and can be applied for future extraction of the agarose.

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Acknowledgements

This study is supported by the Fundamental Research Grant Scheme (Malaysia, FRGS/1/2015/SG05/UNIM/03/1), the Ministry of Science and Technology (MOSTI02-02-12-SF0256) and the Prototype Research Grant Scheme (Malaysia, PRGS/2/2015/SG05/UNIM/03/1).

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Authors and Affiliations

  1. Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Nottingham Malaysia Campus, Jalan Broga, Semenyih, 43500, Selangor Darul Ehsan, Malaysia

    Kit Wayne Chew & Pau Loke Show

  2. Bioseparation Research Group, Faculty of Engineering, University of Nottingham Malaysia Campus, Jalan Broga, Semenyih, 43500, Selangor Darul Ehsan, Malaysia

    Kit Wayne Chew, Pau Loke Show & Yee Jiun Yap

  3. Department of Applied Mathematics, Faculty of Engineering, University of Nottingham Malaysia Campus, Jalan Broga, Semenyih, 43500, Selangor Darul Ehsan, Malaysia

    Yee Jiun Yap

  4. Nanotechnology & Catalysis Research Centre (NANOCAT), Institute of Postgraduate Studies, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Joon Ching Juan

  5. Institute of Ocean and Earth Sciences, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Siew Moi Phang

  6. Institute of Biological Sciences, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Siew Moi Phang & Tau Chuan Ling

  7. Department of Chemical Engineering, National Cheng Kung University, Tainan, 701, Taiwan, China

    Jo-Shu Chang

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  1. Kit Wayne Chew
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  2. Pau Loke Show
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Correspondence to Pau Loke Show.

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Chew, K.W., Show, P.L., Yap, Y.J. et al. Sonication and grinding pre-treatments on Gelidium amansii seaweed for the extraction and characterization of Agarose. Front. Environ. Sci. Eng. 12, 2 (2018). https://doi.org/10.1007/s11783-018-1040-0

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  • DOI: https://doi.org/10.1007/s11783-018-1040-0

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