EFFECT OF CONJUGATED LINOLEIC ACID ON THE STRUCTURE AND OXIDATIVE
STABILITY OF OLEOGEL
Abstract
In this study, some physico-chemical properties of oleogels containing
conjugated linoleic acid (25-50% CLA) produced using beeswax (BW) were
investigated. For this aim, sunflower oil containing CLA was mixed with
a different proportion of BW, and oil binding capacity, centrifugal
stability, color, X-ray diffraction, thermo-oxidative stability,
textural and rheological analyses of the oleogels were undertaken. On
the other hand, thiobarbituric acid and peroxide values of samples were
determined during 120 days. As a result of the textural-rheological
analysis, all of the samples have elastic behavior and were texturally
very stable, homogenous and smooth in structure. In brief, CLA-enriched
oleogels can be successfully used in the food industry with their
suitable rheological properties. On the other hand, according to
thermo-oxidative stability analysis, the increase in the ratio of CLA
and BW caused a decrease in the Tonset and Tmax of the samples.
Oxidation analyzes performed during 120 days showed that when CLA was
used in the oleogel formula, oleogels that were more resistant to
oxidation were obtained. However, there was no statistically significant
difference between the products containing 25% and 50% CLA in terms of
oxidation. Moreover, it was determined that the samples containing 50%
CLA had less resistance to oxidation.