Polyelectroyte behavior of a bacterial polysaccharide from Xanthomonas campestris: Comparison with carboxymethylcellulose
✍ Scribed by M. Rinaudo; M. Mils
- Book ID
- 102762860
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1978
- Tongue
- English
- Weight
- 580 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0006-3525
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✦ Synopsis
Abstract
The main physicochemical properties of the polysaccharide called Xanthan produced by Xanthomonas compestris are discussed: the activity coefficient of the counter‐ion, the p__K__(α), and the ionic selectivity are investigated and compared to those of a carboxymetholcellulose. The weight‐average molecular weight (M~w~ = 2 × 10^6^), the intrinsic viscosity and the constant of sedimentation are determined as a function of the ionic strength. It is proved that in dilute solution, there is no intermolecular association, whatever the ionic strength. The conformation is proposed to be a rigid rodlike molecule whose length is 6000 Å, independent of ionic strength > 10^−2^N.