Optimization of agar extraction from local seaweed species, Gracilaria salicornia in Tanzania

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dc.contributor.authorVuai, S. A. H.
dc.contributor.authorMpatani, F.
dc.date.accessioned2020-03-23T08:42:32Z
dc.date.available2020-03-23T08:42:32Z
dc.date.issued2019
dc.descriptionAbstract. Full Text is available at: https://doi.org/10.1111/pre.12380en_US
dc.description.abstractThis study aimed to develop agar extraction protocols for Gracilaria salicornia from Tanzania and investigate its physico‐chemical characteristics. A 33 factorial experimental design was used in the extraction of agar whereby three independent variables of NaOH concentration (10, 20 and 30% w/v), alkali pre‐treatment duration (0.5, 1 and 2 h) and extraction temperatures (115, 120 and 125°C) were used to determine the optimum conditions for production of high‐quality agar. Agar yield, gel strength, sulfate content, gelling and melting temperatures were evaluated as dependent variables. The optimal condition was observed at 30% NaOH concentration, 2 h alkali pre‐treatment duration and 120°C extraction temperature. The yield, gel strength, sulfate content, gelling and melting temperatures of the agar obtained under these conditions were 26.9 ± 0.7%, 510.3 ± 16.2 g cm−2, 0.29 ± 0.04%, 39.3°C and 88.4°C, respectively. These properties are very close to that of imported commercial agar. It was concluded that the local agar is capable of replacing imported agar for most general purposes. This offers a new possibility of using quality local agar in place of commercial agar.en_US
dc.identifier.citationVuai, S. A. H., & Mpatani, F. (2019). Optimization of agar extraction from local seaweed species, Gracilaria salicornia in Tanzania. Phycological Research, 67(4), 261-266.en_US
dc.identifier.urihttp://hdl.handle.net/20.500.12661/2284
dc.language.isoenen_US
dc.publisherWiley Onlineen_US
dc.subjectAlkali treatmenten_US
dc.subjectMacroalgaeen_US
dc.subjectZanzibaren_US
dc.subjectGel propertiesen_US
dc.subjectGracilaria salicorniaen_US
dc.subjectTanzaniaen_US
dc.subjectAgaren_US
dc.subjectAgar extractionen_US
dc.subjectCommercial agaren_US
dc.titleOptimization of agar extraction from local seaweed species, Gracilaria salicornia in Tanzaniaen_US
dc.typeArticleen_US
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