Abstract
The aggregation of casein micelles in undiluted skim milk after
the addition of chymosin was studied bystatic light scattering and
ultra low shear viscometry. The static light scattering
measurements were madewith two different sample thicknesses, 72
and 16 mum. The scattering data were analyzed by indirect
Fouriertransformation and by the polydispersity inversion
technique which led to pair distance distributionfunctions and
size distribution function, respectively. The minimum scattering
angle was 1 degrees, whichallows for the determination of particle
sizes up to a maximum diameter of 12 mum. The fractal
dimensiondetermined from double logarithmic plots of intensity
versus scattering vector resulted in values between 1.9and 2.0.
The influence of multiple scattering was determined by comparison
of the measurements with thedifferent sample thicknesses. The
measurements show no significant influence of multiple scattering
whenthe transmission is above 0.85. Due to the very complex and
porous structure of the casein aggregates theRayleigh-Debye-Gans
scattering theory has been used in the data analysis. Measurements
with a newinstrument using ultra low shear showed good agreement
with theory. Copyright 1999 Academic Press.
| Original language | English |
|---|---|
| Journal | Journal of Colloid and Interface Science |
| Volume | 213 |
| Issue number | 2 |
| Pages (from-to) | 445-456 |
| ISSN | 0021-9797 |
| Publication status | Published - 1999 |