Eight conducting polymer films of polypyrrole and its derivatives were used as sensitive and selective coatings for thickness-shear mode (TSM) acoustic wave sensors. They were applied to the detection of volatile alcohols and carbonyl compounds, which are important fish freshness determinants. The conducting polymers were synthesized and coated on TSM devices by electrochemical oxidation. The e...

Shell egg quality and freshness are traditionally assessed by destructive laboratory-level methods, thus restricting the possibilities to be easily guaranteed in industrial chain. Non-destructive techniques therefore of paramount importance, giving accuracy, speed, instantaneous results. Among these techniques, spectroscopy is promising because it would allow development on-line applications fo...

Freshness is a key feature of contemporary food systems, however its industrial production as quality carries adverse consequences. Accordingly, this paper approaches freshness matter concern. Drawing on extensive fieldwork across sites and consumption in the UK Portugal, we identify four enactments freshness. The analysis zooms specific case plastic packaging uses these to consider series ques...