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Characterization of Red Seaweed Extracts Treated by Water, Acid and Alkaline Solutions

  • Ahmed Al-Alawi

    Dr. Ahmed Al-Alawi was co-principle investigator of the project. He implemented and monitored the entire experiment and analytical investigations.

    , Pothiraj Chitra

    Pothiraj Chitra was the research assistant, who conducted all the experimental and analytical works. She also helped in analyzing the results and writing the discussion section.

    , Abdullah Al-Mamun

    Dr Abdullah Al-Mamun analyzed the data, wrote the introduction and conclusion sections as well as upgraded the discussion section. He revised and synchronized the entire documents. He gathered all the author's acknowledgement and approval for the final manuscript.

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    , Insaaf Al-Marhubi

    Miss Insaaf Al-Marhubi was laboratory scientist who helped in running all the equipments and writing the “Materials and Methods” section.

    and Mohammad Shafiur Rahman

    Prof. Mohammad Shafiur Rahman is the principle investigator of the project. He contributed in analyzing the data and reviewing the draft for final submission.

Published/Copyright: May 25, 2018

Abstract

Seaweed contained health functional polysaccharides and polyphenols. Five extracts were prepared from red seaweed Melanothamnus somalensis; two of these were aqueous at 20°C (F1) and 70°C (F2), followed by acid (F3), alkali (F4) and acid-washed (F5) treatments. Molecular characteristics of extracts were measured by high-performance liquid chromatography and Fourier transform infrared (FTIR) analyses. Health functionality was determined by sulfate and polyphenol contents, and thermal characteristics were determined by modulated differential scanning calorimetry. Extract F3 contained the highest levels of sulfate followed by F2, F1, F4 and F5, respectively. Similarly, F3 contained the highest polyphenol followed by F4, F2, F1 and F5, respectively. Molecular weight distribution of F1 showed wider distribution of sizes (MW: 1.0 × 103 – 3.0 × 107), and F5 showed a sharp peak (MW: 3.1 × 103); whereas F2, F3 and F4 indicated bimodal distribution. FTIR indicated that all fractions contained agar except F5 and sulfate ester group was attached to carbon 6 of the saccharide.

Funding statement: His Majesty’s Research Trust Fund, Oman (ID: SR/AGR/FOOD/11/01) significantly supported the development of health functional extracts from the locally available seaweed.

About the authors

Ahmed Al-Alawi

Dr. Ahmed Al-Alawi was co-principle investigator of the project. He implemented and monitored the entire experiment and analytical investigations.

Pothiraj Chitra

Pothiraj Chitra was the research assistant, who conducted all the experimental and analytical works. She also helped in analyzing the results and writing the discussion section.

Abdullah Al-Mamun

Dr Abdullah Al-Mamun analyzed the data, wrote the introduction and conclusion sections as well as upgraded the discussion section. He revised and synchronized the entire documents. He gathered all the author's acknowledgement and approval for the final manuscript.

Insaaf Al-Marhubi

Miss Insaaf Al-Marhubi was laboratory scientist who helped in running all the equipments and writing the “Materials and Methods” section.

Mohammad Shafiur Rahman

Prof. Mohammad Shafiur Rahman is the principle investigator of the project. He contributed in analyzing the data and reviewing the draft for final submission.

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Received: 2017-11-8
Revised: 2018-4-15
Accepted: 2018-5-2
Published Online: 2018-5-25

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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