Thermal stress
On water bath (WB Thermomix Braun 18 BU.
Biotech International, Germany), the emulsions were
gradually heated from 40 to 80 °C and the temperature
rise of 5 by 5 °C, keeping each temperature for 30
min. The emulsions were macroscopically analyzed to
observe the occurrence of creaming and separation of
phases after each temperature increase
Rheological analyses
The rheological behavior of each formulation
was performed on Brookfield Rheometer model RVDV-III
cone and plate, connected to a Rheocalc Software version
V 3.0, using the spindle CP 40 and with sample (0.50 g) at
25 °C. Measurements were made using a rotational speed
of 250 rpm, with a variation in the range of 50 to 50 rpm, to
obtain an upward curve. The downward curve was obtained
decreasing the rotations from 250 to 50 rpm (Santos et al.,
2011). The rheological behavior of the formulations was
evaluated using the power law (Guarantini et al., 2006):
τ = κ . γn
(Eq. 2)
Where τ: Shear stress; κ: consistency index; γ: shear
rate and n: flow rate.
Results and Discussions
Pharmacognostical screening
By the chromatoplates obtained using specific
reagents was possible to detect the main chemical
classes of constituents present in the hydrophilic