Direct molecular weight determination in the evaluation of dissolution methods for unreduced glutenin
Author
Summary, in English
A comparison of two dissolution methods, gentle stirring and sonication, for solubilising the ultra-large wheat protein glutenin was made based on a direct determination of the molecular weight of dissolved glutenin. The possible physical breakdown of glutenin by sonication was evaluated. Glutenin was isolated by extraction with hydrochloric acid and freeze dried. The extracted glutenin was dissolved either by gentle stirring at 4 °C in phosphate buffer pH 6.8 containing sodium dodecyl sulphate (SDS) or by ultrasonication in the same SDS containing buffer immersed in an ice-bath. The weight average molecular weight and the molecular weight distribution of the dissolved material were determined using asymmetrical flow field-flow factionation using a multiangle light scattering detector coupled on-line with a refractive index detector. These determinations showed that sonication caused physical breakdown of the ultra-large glutenin proteins. The average molecular weight was found to be 5×106 after sonication and 2×107 after gentle stirring.
Department/s
- Centre for Analysis and Synthesis
- Department of Food Technology, Engineering and Nutrition
Publishing year
2004
Language
English
Pages
1-8
Publication/Series
Journal of Cereal Science
Volume
39
Issue
1
Document type
Journal article
Publisher
Elsevier
Topic
- Food Engineering
- Analytical Chemistry
Status
Published
ISBN/ISSN/Other
- ISSN: 0733-5210