Related Experiment Videos
Structure and solution properties of tamarind-seed polysaccharide
M J Gidley1, P J Lillford, D W Rowlands
1Unilever Research Laboratory, Great Britain.
Carbohydrate Research
|July 30, 1991
Summary
Tamarind seed galactoxyloglucan exhibits significant chain stiffness due to extensive glycosylation, influencing its hydrodynamic behavior in aqueous solutions. This rigidity leads to unique entanglement properties in semi-dilute concentrations, impacting viscosity.
Area of Science:
- Carbohydrate Chemistry
- Polymer Science
- Biophysics
Background:
- Tamarind seed polysaccharides are primarily galactoxyloglucans.
- Understanding their structure-property relationships is crucial for applications.
Purpose of the Study:
- To characterize the structural and hydrodynamic properties of tamarind seed galactoxyloglucan.
- To investigate the influence of chain stiffness on solution behavior.
Main Methods:
- Small-angle X-ray scattering (SAXS) for molecular dimensions.
- Static light scattering for chain stiffness (C infinity).
- Viscosity measurements to define concentration regimes (dilute, semi-dilute).
Main Results:
- Galactoxyloglucan has a galactose:xylose:glucose ratio of 1:2.25:2.8.
- SAXS indicated single-stranded polymer conformation.
- High chain stiffness (C infinity = 110) was observed, attributed to glycosylation.
- Significant hydrodynamic effects and concentration-dependent viscosity were noted, especially in semi-dilute solutions due to "hyper-entanglements".
Conclusions:
- Tamarind seed galactoxyloglucan is a stiff, single-stranded polymer.
- Its extensive glycosylation contributes to chain rigidity.
- The polymer's behavior in solution is governed by its stiffness and entanglement phenomena.