caa a22 4500 445318856 CHVBK 20180317142657.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s10126-010-9350-7 doi (NATIONALLICENCE)springer-10.1007/s10126-010-9350-7 Characterization of Carrageenan Extracted from Hypnea bryoides in Oman [Elektronische Daten] [Ahmed Al-Alawi, Insaaf Al-Marhubi, Mohammed Al-Belushi, Bassam Soussi] 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 41.65g/100g], 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 3.38g/100g]. Alkali treatment with NaOH allowed complete conversion of kappa (κ) 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 (μ and κ) with higher molecular weight compared with the alkali treatments which produced single carrageenan form (κ) with molecular weight of 4.1 × 105Da. 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% κ-carrageenan mixture added with 30mM KCl. Transition temperatures from DSC and rheology showed comparable results and were in good agreement with those previously reported. Springer Science+Business Media, LLC, 2011 Hypnea bryoides nationallicence Algae nationallicence Seaweed nationallicence Phycocolloids nationallicence FTIR nationallicence Al-Alawi Ahmed College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Oman aut Al-Marhubi Insaaf College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Oman aut Al-Belushi Mohammed College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Oman aut Soussi Bassam College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Oman aut Marine Biotechnology Springer-Verlag 13/5(2011-10-01), 893-899 1436-2228 13:5<893 2011 13 10126 https://doi.org/10.1007/s10126-010-9350-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10126-010-9350-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Al-Alawi Ahmed College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Oman aut NATIONALLICENCE 700 1- Al-Marhubi Insaaf College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Oman aut NATIONALLICENCE 700 1- Al-Belushi Mohammed College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Oman aut NATIONALLICENCE 700 1- Soussi Bassam College of Agricultural and Marine Sciences, Sultan Qaboos University, Muscat, Oman aut NATIONALLICENCE 773 0- Marine Biotechnology Springer-Verlag 13/5(2011-10-01), 893-899 1436-2228 13:5<893 2011 13 10126 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer