期刊
MARINE BIOTECHNOLOGY
卷 13, 期 5, 页码 893-899出版社
SPRINGER
DOI: 10.1007/s10126-010-9350-7
关键词
Hypnea bryoides; Algae; Seaweed; Phycocolloids; FTIR
资金
- HM Sultan Qaboos Trust [SR/AGR/FOOD/05/01]
- University of Gothenburg
- Swedish Research Council [K2005-73-00536]
Carrageenophyte red seaweed from Oman, Hypnea bryoides, extracted using three different processes: an aqueous, a mild alkaline, and a more vigorous alkaline extraction was investigated. The resulting extract precipitated by alcohol was subject to chemical and rheological measurements. The total carbohydrate [ranged from 36.78 to 41.65 g/100 g], and ash [39.04 to 43.11 g/100 g] were the most abundant components in H. bryoides and contrary to the two, lipid content was found at a minimum [ranging from 2.95 to 3.38 g/100 g]. Alkali treatment with NaOH allowed complete conversion of kappa (kappa) carrageenan form as detected by FTIR analysis. Total yield by alkali treatments gave higher yields (33%) compared with aqueous treatments (12%). However, subsequent aqueous treatment produced mixed carrageenan (mu and kappa) with higher molecular weight compared with the alkali treatments which produced single carrageenan form (kappa) with molecular weight of 4.1 x 10(5) Da. The effects of thermal history on gel-sol and sol-gel transition were investigated by differential scanning calorimeter (DSC) and rheology on a pure sample and 1.5% kappa-carrageenan mixture added with 30 mM KCl. Transition temperatures from DSC and rheology showed comparable results and were in good agreement with those previously reported.
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