In the food industry, the quality of raw materials is crucial. It is therefore essential to test everything from the input materials to the finished drinks during production to ensure that the resulting products are safe and tasty. One of the key factors affecting the final quality is the purity of the carbon dioxide (CO₂) used to carbonate the drinks.
Why is CO₂ purity important?
Carbon dioxide used in beverages must meet strict standards: at least 99.9% purity. Even trace amounts of impurities, such as aromatic hydrocarbons, can be noticed by consumers as an undesirable odor or taste change.
If impurities in CO₂ are not captured in time, they can only be seen in the finished beverage on the shelves. Customer complaints then reveal a problem that could have been prevented. That is why accurate and timely CO₂ analysis is key.
How does Coca-Cola control the quality of its CO₂?
Previously, CO₂ samples were collected by hand, taken to a lab, and subjected to tests that could take up to an hour. This process involved the use of chemicals and labware, which not only slowed production but also increased the potential for human error.
Today, Coca-Cola Beverages Northeast uses the Thermo Scientific MAX-Bev System, which uses FT-IR spectroscopy to quickly and accurately analyze CO₂ directly upon delivery.
Advantages of FTIR spectroscopy in the MAX-Bev System
✔ Real-time measurement: Analysis takes approximately nine minutes, allowing for immediate quality control.
✔ Trace impurity detection: FT-IR spectroscopy can identify impurities at ppm and ppb (parts per million/billion) levels, such as aromatic hydrocarbons at a concentration of 0.02 ppm.
✔ Automation and minimization of human error: The system automatically evaluates CO₂ purity and provides a simple “pass/fail” output, reducing the risk of incorrect decisions.
✔ Process acceleration: Lab technicians do not have to handle samples, wait for results, or return to suppliers with complaints.
How is CO₂ testing done upon receipt of a delivery?
- Upon arrival of the tanker, a laboratory technician will verify the seals and documentation.
- The CO₂ sample is automatically collected and analyzed using the MAX-Bev System spectrometer.
- Results are displayed within minutes. If the CO₂ meets Coca-Cola and ISBT (International Society of Beverage Technologists) standards, the shipment is approved.
- If the CO₂ does not meet the required values, the delivery is rejected, thus preventing possible spoilage of the beverages.
The importance of FT-IR spectroscopy in the food industry
Using FT-IR spectroscopy allows the detection of impurities at levels that would be difficult to measure using other methods. For beverage and food manufacturers, it is a key tool to ensure consistent taste and product safety.