109 research outputs found
NMR and rheological study of Aloe barbadensis partially acetylated glucomannan
AbstractThe structural and rheological properties of the Aloe extract (AE) and the polysaccharidic fraction (PF) obtained from the leaves pulp of Aloe barbadensis Miller were investigated. Structural analyses carried out by composition, methylation analysis and NMR spectroscopy showed that PF is mainly constituted by a partially acetylated 4-linked β-d-glucomannan. The acetyl groups are located at C-2, C-2 and C-3, C-3 and/or C-6. The acetylation pattern of this type of polysaccharide was for the first time established using bidimensional NMR analyses. AE and PF aqueous solutions at 25°C showed a non-Newtonian behavior (with pseudoplastic characteristics), however PF showed higher apparent viscosity than AE. Dynamic oscillatory analyses showed that both samples, at the same concentration, behaved as a concentrated solution. PF presented higher values of G′ compared with those of AE and this behavior could be consequence of its higher content in partially acetylated glucomannan
Ruminal parameters of bovines fed diets based on sugar cane with doses of calcium hydroxide
Mammals of the Bodoquena Mountains, southwestern Brazil: an ecological and conservation analysis
Efeito do extrato aquoso de cabelo de milho (Zea mays L.) sobre a excreção renal de água e eletrólitos e pressão arterial em ratos Wistar anestesiados
Genotyping and antimicrobial susceptibility of Clostridium perfringens isolated from Tinamidae, Cracidae and Ramphastidae species in Brazil
Extrato aquoso de ramos de Trichilia pallida e o desenvolvimento de Spodoptera frugiperda em genótipos de milho
A review of bush dog Speothos venaticus (Lund, 1842) (Carnivora, Canidae) occurrences in Paraná state, subtropical Brazil
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