5 documents found, page 1 of 1
Exploring relationships between seaweeds carrageenan contents and extracted hyb...
Azevedo, G.; Torres, M. D.; Almeida, P. L.; Hilliou, L.The types and amounts of carrageenans present in a set of Mastocarpus stellatus, Chondrus crispus and Ahnfeltiopsis devoniensis, are assessed by solid-state NMR performed directly on dried and powdered seaweeds. The resulting chemical analysis is compared with the chemical structure and gel elasticity of the hybrid carrageenans extracted from these three carrageenophytes. ν-carrageenan is only found in a single...
Phase diagrams of hybrid carrageenans extracted from Ahnfeltiopsis devoniensis ...
Torres, M. D.; Azevedo, Gabriela; Hilliou, L.NaCl and KCl phase diagrams of two kappa/iota-hybrid carrageenans (KI) are established, and the rhe-ological properties of obtained solutions and gels are reported. KI were extracted from Ahnfeltiopsisdevoniensis and Chondrus crispus seaweeds and showed different chemical composition, 48 mol% of kappacarrageenan (K) and 52 mol% of iota carrageenan (I), and 78 mol% of K and 22 mol% of I, respectively. Phasediagr...
Effect of pre-extraction alkali treatment on the chemical structure and gelling...
Azevedo, G.; Torres, M. D.; Sousa-Pinto, I.; Hilliou, L.to investigate the effect of alkali type, concentration and treatment duration on the chemical structure and the gelling properties of extracted hybrid carrageenan (HK). In both seaweeds, increasing the KOH content and the pre-treatment duration gives HK with lower amounts of n-carrageenan units, which have a direct impact on the improved gelling properties. Nevertheless, HK with smaller molecular mass and depr...
Surface tension and refractive index of guar and tragacanth gums aqueous disper...
Moreira, R.; Chenlo, F.; Silva Blanco, C.; Torres, M. D.; Diaz-Varela, D.; Hilliou, L.; Argence, H.Surface tension and refractive index of guar gum (GG) (up to 0.97% w/w) and tragacanth gum (TG) (up to 1.41% w/w) aqueous dispersions were determined for systems with only one and both gums (mixtures) (up to 1.25% w/w). Experimental determinations were carried out from 5 to 30 C for surface tension and from 10 C to 40 C for refractive index. For mixtures, the effect of polymer ratio (1:3, 1:1 and 3:1) was analy...
Drying kinetics of biofilms obtained from chestnut starch and carrageenan with ...
Moreira, R.; Chenlo, F.; Torres, M. D.; Prieto, D. M; Sousa, A. M. M.; Hilliou, L.; Gonçalves, M. P.; Silva Blanco, C.Drying kinetics of biofilms from chestnut starch and hybrid carrageenan were experimentally determined and modelled. The biofilms were obtained by mixing the respective solutions (4.0% w/w) of both substances in the proportion 80/20 of chestnut starch/hybrid carrageenan. Glycerol (at 5.0% w/w) was added to some biofilms. Biofilms were prepared using a casting method. Drying kinetics were performed at 30, 40, an...