Abstract
The microbial spoilage of meat is accompanied by the release of volatile organic compounds (VOCs), many of which are odorous. These compounds give spoiled meat its characteristic pungent, sour, sulphury odour that provides consumers with an indication that the meat is unpalatable. Characterising meat spoilage based on volatile markers is of interest to the food industry in view of developing food freshness indicators (FFIs) to maintain food quality and reduce food waste. Conventional analytical methods for detecting VOCs developing during food spoilage involve intermittent sampling that delivers only snapshots of the release processes and thereby only limited information on the kinetics of their production and release. Proton-transfer-reaction mass spectrometry (PTR-MS) is an on-line technique that enables the detection of VOCs in real-time, thereby offering the possibility to follow the release of VOCs with a high time resolution. An analytical method using PTR-MS was developed to enable the continuous detection of VOCs released from chicken breast fillets inoculated with Brochothrix thermosphacta and stored under modified atmosphere (30 % CO2, 70 % O2) at 4 °C for 1 week. The meat spoilage VOCs detected by PTR-MS displayed different temporal dynamics of production and release, depending on the extent of spoilage. This paper describes the development of an analytical set-up for real-time detection of volatile spoilage markers using PTR-MS. This case study using inoculated chicken breast fillets demonstrates the applicability of this method to characterise individual VOC release patterns, which is of potential utility in the development of FFIs for the consumer market.
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Acknowledgments
The authors are grateful for the financial support from the German Federal Ministry for Economic Affairs and Energy via the German Federation of Industrial Research Associations (AiF) and the Industry Association for Food Technology and Packaging (IVLV), project number AiF 17803N. We are grateful to Horst-Christian Langowski (Fraunhofer IVV and TUM) for his support and advice on performing these experiments, Linda Höll and Rudi Vogel (TUM) for consultation on the microbiology and for supplying the bacterial strain used in these studies and Hannes Petermeier and Bendix Koopmann (TUM) for programming an algorithm in R that was used here to process the PTR-MS data. We additionally thank Olivia Matheis (Fraunhofer IVV) for her assistance in conducting the fragmentation studies of the pure compounds.
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This study was funded by the German Federation of Industrial Research Associations (AiF) and the Industry Association for Food Technology and Packaging (IVLV) project number AiF 17803N.
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CF has received a research grant from the AiF but declares no further conflict of interest. JB declares that he has no conflict of interest.
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Franke, C., Beauchamp, J. Real-Time Detection of Volatiles Released During Meat Spoilage: a Case Study of Modified Atmosphere-Packaged Chicken Breast Fillets Inoculated with Br. thermosphacta . Food Anal. Methods 10, 310–319 (2017). https://doi.org/10.1007/s12161-016-0585-4
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DOI: https://doi.org/10.1007/s12161-016-0585-4