Related Experiment Video
Updated: May 26, 2026

Cellular Lipid Extraction for Targeted Stable Isotope Dilution Liquid Chromatography-Mass Spectrometry Analysis
Published on: November 17, 2011
Free radical scavenging activity of conjugated linoleic acid as single or mixed isomers
Yassir Mohammed Ali1, Arifah Abdul Kadir, Zuraini Ahmad
1Faculty of Veterinary Medicine, Universiti Putra Malaysia, Selangor, Malaysia.
Context:
Conjugated linoleic acids (CLAs) are a mixture of positional and geometric isomers of linoleic acid (LA) and believed to have many positive biological activities.
Objective:
The present study was undertaken to assess the antioxidant activity of cis-9, trans-11 and trans-10, cis-12 as single or mixed CLA isomers at two ratios, 1:6 and 1:13 (trans-10, cis-12/cis-9, trans-11).
Materials And Methods:
A microplate reader was used to determine the free radical scavenging properties of CLAs against DPPH radical in ethanol.
Results:
The kinetic reactions of CLA-DPPH(•) showed that all tested CLAs have exerted radical scavenging activities in a dose-dependent manner and observed to immediately react and quench DPPH radicals at all tested levels and no lag phase was noticed in CLA-DPPH(•) reactions. The median inhibitory concentration (IC₅₀) value for cis-9, trans-11 CLA was observed to be more effective than other tested CLA. Total antioxidant capacity (TAC) of all tested CLAs were less effective radical scavengers as compared to vitamin E and butylated hydroxytoluene, although all tested CLAs were quenched a high amount (P < 0.05) of DPPH free radicals.
Discussion And Conclusion:
All tested CLAs have the ability to directly react and quench DPPH free radicals in ethanol. Furthermore, trans-10, cis-12 CLA has greater maximal efficacy than other tested CLAs as free radical scavenger, while cis-9, trans-11 CLA is the most potent isomer to directly react and quench free radicals at low concentrations in the system, suggesting that the free radical scavenging activity of CLA isomers may contribute to their diverse biological activities.
Related Concept Videos
Radical Autoxidation
Radical Reactivity: Steric Effects
Along with electronic factors, steric factors also account...
Stability of Conjugated Dienes
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
Radical Halogenation: Stereochemistry
Halogenation to form a new chiral center:
Radical Reactivity: Nucleophilic Radicals
Structure of Lipids

