Polysaccharide gels properties

Xanthan has several undesirable properties. It ordinarily forms microgel particles that can plug permeability(137), it is expensive relative to other natural polysaccharide gel agents, and it resists degradation by ordinary gel breaker additives. These features have kept xanthan applications in fracturing gels to a minimum. Some literature(138) on xanthan has appeared. 

These structures and conformations of polysaccharide molecules and their intermolecular associations give polysaccharide solutions, polysaccharide dispersions, and polysaccharide gels their special properties in biologic systems and in industrial usage. The ease with which polysaccharides dissolve is related to their conformation and structure in many the same ways as is their solution behavior. 

Braudo, E. E., Plashchina, I. G., and Tolstoguzov, V. B. 1984. Stmctural characterisation of thermoreversible anionic polysaccharide gels by their elastoviscous properties. Carbohydr. Polym. 4 23-48. 

Coviello T, AUiaique F, Parisi C, Matricardi P, Bocchinfuso G, and Grassi M. A new polysaccharidic gel matrix for drug delivery Preparation and mechanical properties. J. Control. Rel. 2005 102 643-656. 

Polysaccharides. There is considerable variation among gelling polysaccharides in molecular structure, in type of junctions, and in the dependence of gel properties on external conditions. Treatment of all of these systems and their particulars is outside the scope of this book, so the discussion will be restricted to some general aspects. An important... 

The physicochemical properties of alkylated polysaccharides have received some attention, and details of the structures and conformations of 0-methylcelluloses, and their interaction in micelle junctions, have been included in a thorough discussion of polysaccharide gels and networks. Information on the polydispersity of samples of partially methylated cellulose may be obtained from column fractionation and by fractional precipitation from a solvent-nonsolvent system, but, for a more complete characterization of polydispersity, fractionation with a series of solvent-nonsolvent systems is necessary. The solubility, in water, of polysaccharides that are mainly methylated may be considerably improved by introduction of a few suitable ionizing groups, for example, by reaction with monochloroacetic acid to introduce carboxymethyl ether groups. The general sorption and diflFusion features of hydrocarbons and other... 

These data indicate that deacetylated PS-60 has gel properties similar to those of agar and K-carrageenan. Therefore, it is to be expected that this polysaccharide will find utility in those industrial applications where agar and K-carrageenan are now used. 

Plieva FM, Galaev lY, Mattiasson B (2010) Macroporous polysaccharide gels. In Mattiasson B, Kumar A, Galaev I (eds) Macroporous polymers production, properties and biological/biomedical applications. CRC, Boca Raton, p 131... 

HYDROPHOBIC NATURE OF SUGARS AS AN ORIGIN OF HYDROPHOBIC PROPERTIES OF POLYSACCHARIDE GELS... 

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