Trans fatty acids (TFAs), also known as trans fats, are often referred to as "hidden dangers on the plate." They primarily come from partially hydrogenated vegetable oils, which have been widely used in various food products such as cakes, cookies, frozen pizzas, French fries, and popcorn due to their high heat resistance, stability, and long shelf life. However, excessive consumption of trans-fatty acids can raise blood cholesterol levels, significantly increasing the risk of cardiovascular diseases.
The testable components include: n-hexane, methyl tridecanoate, methyl octadecanoate, methyl anti-octadecenoate, cis-methyl octadecanoate, anti-octadecadienoic acid methyl ester, methyl octadecadiate, methyl eicosanoate, cis-methyl eicosenoate, and similar compounds.
The gas chromatograph used for this analysis is the GC-6890 model, a cost-effective and reliable analytical instrument. It features microcomputer control, a user-friendly keyboard interface, and an LCD menu with Chinese display options. The system is highly integrated, ensuring good reliability and ease of use. It also includes memory settings for parameters, allowing it to operate continuously without needing to be reset frequently.
This instrument comes with a large oven and a powerful cooling fan, along with an automatic rear door system that enhances the cooling efficiency of the oven, enabling near-room temperature operation. It supports flexible use of capillary, glass, and stainless steel columns, and offers both constant temperature and temperature-programmed operation modes.
Key performance features include:
- A large-screen LCD with Chinese display for easy operation.
- Self-diagnosis, over-temperature power-off protection, file storage, fifth-order temperature programming, and single-column automatic compensation functions, ensuring stable baseline during temperature-programmed analysis.
- Six independent temperature control zones, combined with an intelligent door-opening system that provides fast cooling speeds. Each vaporization chamber, detector, and amplifier is designed as a modular unit for easy installation and replacement.
- A dedicated capillary analysis system with a split injector (including diaphragm cleaning, splitting, and makeup adjustment). Optional capillary split or splitless injectors are available.
- Equipped with a hydrogen flame ionization detector (FID), thermal conductivity detector (TCD), and flame photometric detector (FPD), allowing users to choose based on their analytical needs. Additional accessories like a six-way valve injection system and reformer device can also be added. Detectors can operate in parallel for enhanced efficiency.
Technical specifications:
- **Temperature Control Range**: Oven: 6°C to 399°C (±0.1°C accuracy). Injector and detector: Above room temperature, 6°C to 399°C (±0.1°C accuracy).
- **Temperature Programming**: Fifth-order programming with a rate of 0.1°C to 40°C/min for temperatures up to 200°C, and 0.1°C to 20°C/min above 200°C.
- **Detector Performance**:
- **Hydrogen Flame Detector (FID)**:
- Sensitivity: ≤1×10â»Â¹Â¹ g/s (n-hexadecane)
- Noise: ≤5×10â»Â¹â´ A
- Linear range: ≥10â¶
- **Thermal Conductivity Detector (TCD)**:
- Sensitivity: ≥5000 mV·ml/mg (hexadecane)
- Noise: ≤20 μV
- Linear range: ≥10â´
- **Flame Photometric Detector (FPD)**:
- Sensitivity: 1×10â»Â¹Â¹ g(S)/s (in thiophene), 1.4×10â»Â¹Â² g(P)/s (in methyl parathion)
This advanced gas chromatograph is ideal for precise and efficient analysis of trans fatty acids and other related compounds, making it a valuable tool in food safety and quality control laboratories.
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