A preliminary study on the agar content and agar gel strength of gracilaria manilaensis using different agar extraction processes

Radiah Ahmad, Misni Surif, Nazaruddin Ramli, Norain Yahya, Adibi Rahiman Md Nor, Lyazzat Bekbayeva

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    The aim of this study was to investigate the agar content and agar gel strength from intact and squeezed thalli of Gracilaria manilaensis collected from the earthen pond at Pantai Merdeka, Kedah, Malaysia. Agar content and agar gel strength of different agar extraction processes, i.e. native extraction and NaOH (5% w/v NaOH) treated of intact and squeezed thalli at different time intervals, were evaluated. The results showed that agar yield of intact thalli was highest in native extraction (13.5%); whereas, agar yield of squeezed thalli was highest when treated with 5% w/v NaOH for 3 hrs (9.4%). For intact thalli, agar yield of alkali-treated samples were less than native extraction. For squeezed thalli, agar yield of alkali-treated samples were not much different when treated at different time intervals except for 1hr treatment which showed that agar yield of intact thalli was lower than squeezed thalli. The gel strength was very low (< 60 g) for native extraction in both intact and squeezed thalli, but higher after treated with alkali. Analysis of variance of gel strength showed significant difference (p < 0.05) between native extraction and 3 hrs alkali treatment of intact thalli, while squeezed thalli showed significant difference (p < 0.05) between native extraction and 6 hrs, 12 hrs and 24 hrs of alkali treatment. The results demonstrated that alkali treatment did not affect agar yield; instead, it affected the gel strength of extracted agar under squeezed condition.

    Original languageEnglish
    Pages (from-to)184-188
    Number of pages5
    JournalWorld Applied Sciences Journal
    Volume15
    Issue number2
    Publication statusPublished - 2011

    Fingerprint

    Gracilaria
    gel strength
    thallus
    agar
    alkali treatment
    alkalis
    Malaysia
    analysis of variance

    Keywords

    • Agar gel strength
    • Alkali treatment
    • Gracilaria manilaensis
    • Intact thalli
    • Squeezed thalli

    ASJC Scopus subject areas

    • General

    Cite this

    A preliminary study on the agar content and agar gel strength of gracilaria manilaensis using different agar extraction processes. / Ahmad, Radiah; Surif, Misni; Ramli, Nazaruddin; Yahya, Norain; Nor, Adibi Rahiman Md; Bekbayeva, Lyazzat.

    In: World Applied Sciences Journal, Vol. 15, No. 2, 2011, p. 184-188.

    Research output: Contribution to journalArticle

    Ahmad, Radiah ; Surif, Misni ; Ramli, Nazaruddin ; Yahya, Norain ; Nor, Adibi Rahiman Md ; Bekbayeva, Lyazzat. / A preliminary study on the agar content and agar gel strength of gracilaria manilaensis using different agar extraction processes. In: World Applied Sciences Journal. 2011 ; Vol. 15, No. 2. pp. 184-188.
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