Oxidation stability of sausages with PEG

Importance of the Topic

The stability of antioxidants in sausages directly influences shelf life and product quality, making rapid and reliable methods essential for meat processing and quality control.

Study Objectives and Overview

This application note evaluates the oxidation stability of cervelat and bratwurst sausages using the Metrohm Rancimat method with a polyethylene glycol (PEG) carrier. The goal is to determine induction times that reflect antioxidant capacity and predict shelf life.

Methodology and Instrumentation

Sausage samples are finely chopped and mixed with PEG directly in the Rancimat reaction vessel without further preparation. A controlled airflow at defined temperatures (100 °C and 120 °C) induces oxidation, and the conductivity of an absorbing solution is monitored continuously. The time until a rapid conductivity rise occurs is recorded as the induction time.

Instrumentation used

• 892 Professional Rancimat with eight measuring positions
• StabNet software for data acquisition and evaluation

Main Results and Discussion

At 100 °C, cervelat sausages exhibited an average induction time of 8.75 h (SD_rel 8.6 %), while bratwurst showed 2.29 h (SD_rel 7.3 %). At 120 °C, induction times decreased to 1.44 h (SD_rel 3.8 %) for cervelat and 1.99 h (SD_rel 8.0 %) for bratwurst. The PEG method ensures uniform sample dispersion and captures matrix effects, enabling precise antioxidant stability assessment.

Benefits and Practical Applications

• No sample preparation simplifies workflow and reduces error
• Simultaneous analysis of up to eight samples increases throughput
• Direct measurement of the entire matrix ensures relevant quality data
• Applicable to routine quality control and product development in the meat industry

Future Trends and Opportunities

Automating sampling and data integration, refining temperature protocols for sensitive products, and correlating induction times with sensory and chemical markers can extend the method to diverse food matrices and strengthen predictive shelf life models.

Conclusion

The Rancimat-PEG approach provides a straightforward, reproducible determination of oxidative stability in sausages, supporting consistent quality assurance and efficient laboratory operations.

Reference

No references were provided in the source document.