A rapid method for trans-fatty acid determination using a single capillary GC

Area of Science:

• Analytical Chemistry
• Food Science

Background:

• Trans-fatty acids (TFAs) are isomers of unsaturated fatty acids with significant health implications.
• Accurate and efficient determination of TFAs is crucial for food quality control and regulatory compliance.

Purpose of the Study:

• To develop a rapid, single capillary column method for trans-fatty acid determination.
• To establish isothermal conditions for effective separation of cis/trans-fatty acid isomers.

Main Methods:

• Development of a rapid analytical method utilizing a single capillary column.
• Establishment of isothermal conditions for cis/trans-isomer separation using 30- to 60-m columns.
• Correction of analytical data using molecular weights of fatty acid methyl esters and free fatty acids.

Main Results:

• Trans-fatty acid analysis completed in 20 min for non-hydrogenated oils and 40 min for hydrogenated oils.
• Results demonstrated high correlation with the official American Oil Chemists' Society (AOCS) method using a 100-m column.
• Analytical data confirmed to be consistent with quantitative analysis using an internal standard after molecular weight correction.

Conclusions:

• The proposed rapid method provides accurate trans-fatty acid determination.
• The method is suitable for quality control processes, offering significant time savings.
• This technique can be applied similarly to the established AOCS official method.