Synergistic Solubilization of Mixed Nutraceuticals in Modified Discontinuous Micellar Cubic Structures - Food Colloids: Self-Assembly and Material Science - page 93

from 10 to +101C shows the existence of 1:2 reciprocal ratios of the first and
the second diffraction orders; the intensity decreases with increase in the
temperature, but at 10 1C the second peak could not be seen. Close examination
of the SAXS diffractions in the temperature range 8-221C reveals the coexist-
ence of two mesophases, the Q L phase and the lamellar phase. The Q L phase
was discussed in our earlier report. 16
Once the sample reaches 231C, the ratio of the reciprocal spacing changes in
good agreement with a typical Q L phase. The WAXS diffractogram exhibits a
broad peak centred at 4.6A ˚ [Figure 3(a)]. The lamellar and Q L phases were
further analysed by the SAXS synchrotron between 0 and 401C. It was found
that, from 8 to 201C, the intensity from the lamellar mesophases becomes
gradually reduced and a transformation to the Q L phase occurs. The Q L
mesophase peaks progressively become more pronounced and they have higher
intensities, as shown in Figure 4. The progressive thermal transformation is
strongly consistent with a gradual disordering of the L a phase. This can be seen
from the disappearance of the peaks related to the L a phase, which is accom-
panied by the appearance of the Q L peaks.
These overall findings are in good agreement with the study of Cherezov
et al. 34 on the phase transition from L a to the inverse bicontinuous cubic phase
Figure 4 Synchrotron SAXS intensity as function of temperature. (a) L b and L a ( ' )
and Q L ( J ) mesophases at 0-401C. (b) Expanded plot for L a mesophases. (c)
Expanded plot for Q L mesophases