As part of a milk processor’s annual winter campaign for monitoring the contamination of raw milk with anaerobic spores harmful to cheese – also called butyric acid spores – the analysis methods currently used in Switzerland (MPN method according to CNERNA and filtration method according to Bourgeois) are compared with a new method (SY-LAB). To this end, 93 milk samples from silage-free and 217 samples from non-silage-free milk production were examined with all three methods. In the latter group, the new method delivered more impressive results than the other methods, thanks to its greater precision and a very large measurement range of 44 to 19,000 spores/L. In the milk samples from silage-free milk production, the new method detected spores in only 9 % of the samples, the filtration method in 29 % (detection level of 25 spores/L) and the MPN method in 44 % of the samples (detection level of 53 spores/L). In combining the filtration method’s advantage of specificity with the robustness of MPN methods, the new method could offer advantages not just for silo milk, but also for silo-free milk, despite its lower sensitivity.
Metschnikowia pulcherrima is a naturally occurring yeast with applications in agriculture, the food industry and biotechnology. Agroscope is investigating this yeast in particular with regard to biocontrol applications in plant protection.
Soya-, cereal-, seed- or nut-based plant drinks are consumed increasingly frequently as milk substitutes. Agroscope researchers have studied the macro- and micronutrients in these drinks and have identified major differences between the plant drinks themselves as well as in comparison with milk.
Cheese varieties from Switzerland are characterised according to various criteria. Agroscope analysed the free volatile carboxylic acids in ten cheese varieties and demonstrated that the latter are suitable for characterisation and differentiation.