Some physical properties of aqueous solutions of African Albizia zygia (D.C.) Macbride have been evaluated. Approximately 80 % of the gum is soluble in the cold with the remainder dispersed as fine particles of gel. pH titration of the gum indicates one acid group, pK, = 3.8, for every three monosaccharide units. Solutions of the gum exhibit typical polyelectrolyte behaviour. The viscosity of the solutions increases with concentration but above 1.5 % the solutions exhibit shear-thinning. The viscosity of an ice cream mix containing the gum and the properties of the resultant ice cream are compared with standard mixes.
The effect of inorganic ions on the interaction between Methylene Blue and K and A carrageenan fractions and carboxymethylcellulose (CMC) has been investigated using visible absorption spectroscopy. The concentration of ions required to remove completely Methylene Blue (MB) from the MB-polyanion comp1exi.e. the limiting salt concentration, has been determined and found to decrease in the order Li+ > Na+ > K+ > Cs+, and Mg2+ > Ca2+ > Sr2+ for carrageenans and K+ > Na+ and Mg2+ > Ca2+ > Sr2+ for CMC. Comparing ions of the same valency, the strength of binding is greatest for the smallest hydrated ion, and decreases in proportion to the hydrated ion size, except for the alkali ions with CMC, when the opposite is the case.
Die Grenzkonzentrationen, oberhalb derer eine Komplexbildung zwischen Methylenblau und den Titelanionen (Metachromasie) nicht mehr stattfindet, nimmt von Li zu Cs und von Mg" zu Sr" für die Carrageenan‐ Anionen ab.
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