Chemical and Functional Properties of Food Saccharides

© 2004 by CRC Press LLC
Monitoring of mobilities within starch glucan solutions and transforming the
obtained results into dimensions of moving segments results in the situation illustrated
in Figures 22.9(a) and Figure 22.9(b) for wheat, and, when simplified, shows
two populations: (1) a major mass fraction [Figure 22.9(a)] with dimensions (l coh)
of 10–30 nm, representing individual dissolved starch glucan molecules; and (2) a
minor, but not negligible, fraction [Figure 22.9(b)] with dimensions (l coh) of 100–800
nm representing glucan aggregates.
Mass Fraction
LS-Intensity Fraction
0.15
0.1
0.05
0
0.3
0.2
0.1
0
20 40 60 80
Coherence Length [nm]
(a)
200 400 600 800
Coherence Length [nm]
(b)
FIGURE 22.9 (a) Wheat starch glucans: photon correlation spectroscopy analysis of mass
fractions of dissolved coherently moving (D T) glucans transformed into coherence lengths
(l coh). (b) Wheat starch glucans: photon correlation spectroscopy analysis of intensity fractions
(equivalent to information about molecular weight obtained from light scattering) of dissolved
coherently moving (D T) glucans transformed into coherence lengths (l coh).