Electrochemistry of the Acid Polysaccharide from Lannea grandis
| Main Authors: | S. R. Chaudhuri, B. K. Seal, S. K. Mukherjee |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1969
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6460827 |
Daftar Isi:
- The potentiometric and conductometric behaviour of the degraded and original acid polysaccharides, derived from the exudate of Lannea grandis, has been studied under a wide range of experimental conditions. The effect of branching on the dissociation and conductance of these polyacids has been investigated. The equivalent weights of the degraded and original polyacids have been found to be 950 and 1361 respectively. The titration results have been described by a modified form of the Henderson equation: pH= pKm+n log \({\alpha \over 1-\alpha}\) The intrinsic dissociation constants of the degraded and original polyacids, determined by extrapolation of the \(\alpha\) vs. pKc curves to \(\alpha\) = 0, are 4.20 and 4.65 respectively. The concentration dependence of pH at any given \(\alpha\) follows a relation of the form : \([pH]^\alpha_c=[pH]^\alpha_o-A C.\) \({1 \over 2}\)The electrostatic interactions in these polyacids are very weak and decrease with increasing concentration of neutral salts. At comparable concentrations the equivalent conductance of the original polysalt is less then that of the degraded sample. A semiquantitative estimate of counterion-association has been reported.