title: An overview on the presence of cyclopropane fatty acids in milk and dairy products.
abstract: A survey was carried out to determine the presence of cyclopropane fatty acids (CPFA) in various dairy products. CPFA such as lactobacillic acid and dihydrosterculic acid are components of bacterial membranes and have been recently detected in milk from cows fed with maize silage. In this paper about 200 dairy samples comprising cow, sheep, and goat milk, cheese, yogurt/fermented milk, and butter were analyzed. Results showed that cow milks were generally positive to CPFA (0.014-0.105% of total fatty acids), while goat, yak, and sheep milks were negative. Experimental yogurt and fermented milks showed the same CPFA content of the starting milk. Positive to CPFA were also the majority of samples of commercial butter and cheeses, except some PDO cheeses as Parmigiano-Reggiano and Fontina, cheeses from mountain regions, and goat and sheep cheeses. These data suggest that the presence of CPFA in dairy products could be used as a marker of silage feeding.
authors.affiliation: Dipartimento di Scienze degli alimenti, Università degli Studi di Parma , Parco Area delle Scienze 17/A, 43124 Parma, Italy.
authors.forename: Augusta
authors.initials: A
authors.lastname: Caligiani
authors.forename: Angela
authors.initials: A
authors.lastname: Marseglia
authors.forename: Gerardo
authors.initials: G
authors.lastname: Palla
mesh_terms: D000821:Animal Feed; D000818:Animals; D001419:Bacteria / Q000737:chemistry / Q000648:ultrastructure; D002079:Butter / Q000032:analysis; D002417:Cattle; D002473:Cell Wall / Q000737:chemistry; D002611:Cheese / Q000032:analysis; D003521:Cyclopropanes / Q000032:analysis*; D003611:Dairy Products / Q000032:analysis*; D005227:Fatty Acids / Q000032:analysis*; D005285:Fermentation; D008401:Gas Chromatography-Mass Spectrometry; D006041:Goats; D007778:Lactobacillus / Q000378:metabolism / Q000648:ultrastructure; D008892:Milk / Q000737:chemistry*; D012756:Sheep
chemical_list: D003521:Cyclopropanes; D005227:Fatty Acids; C028775:cyclopropane fatty acids; D002079:Butter