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metabolomics (2)

The assessment of egg freshness is still challenging, due to the lack of robust chemical markers.  Freshness is a crucial parameter for ensuring the production of safe and high‐quality foods. Italian researchers have selected 31 marker compounds based on a metabolomic approach related to the freshness of egg products used as ingredients for compound foods. They were selected from samples of egg products, which were extracted after delivery to the production plant, and after 24 and 48 hours at room temperature. The extracts were analysed by ultrahigh‐pressure liquid chromatography–high‐resolution mass spectrometry (UHPLC‐HRMS), and different chemometric models were created to select those compounds that changed during the storage period, and hence are related to freshness. Furthermore, this UHPLC‐HRMS metabolomic approach allows for the detection of a larger set of metabolites clearly related to possible microbial growth over time, which is a relevant point for also ensuring food safety.

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In this review by Spanish researchers, an updated, comprehensive and balanced overview of the recent studies (2015-2018) that have applied omics-based technologies for the authentication of food is given. The omics-based molecular tools discussed in the review include genomics, proteomics and metabolomics-based methods.

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