Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 35, Issue 1, Pages 15-22Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2004.02.002
Keywords
beta-lactoglobulin; pectin; complexes; associative phase separation; nucleation and growth
Ask authors/readers for more resources
Interpolymer complexation between beta-lactoglobulin (beta-1g) and pectin led to phase separation. Small angle static light scattering and phase contrast microscopy were used to monitor the phase separation of beta-1g/low-methoxyl or high-methoxyl-pectin (LM- or HM-pectin) dispersions as they were slowly acidified from pH 7 to 4 with glucono-delta-lactone (GDL). The monotonic decrease in scattered light intensity with the wave vector was associated with a nucleation and growth phase separation mechanism. Microscopic observations and turbidity measurements showed the increase of complex amounts with lower pH and at higher beta-1g/pectin ratios. The formation of intrapolymer complexes was initiated at pH 6.4 with the LM-pectin and at pH 5.0 with the HM-pectin. Local ordering with increasing amounts of small complexes was observed as scattered light intensity increased at intermediate q values. The beta-1g/LM-pectin complexes at the 5:1 and the 2:1 weight ratios and the beta-1g/HM-pectin complexes at 5:1 weight ratio have fractal structures. The formation of large amounts of small assemblies and sedimentation would be responsible for the decrease in the number and volume mean diameters and fractal dimension of beta-1g/LM-pectin complexes over time. (C) 2004 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available