title: Content and distribution of phytanic acid diastereomers in organic milk as affected by feed composition.
abstract: Phytanic acid (PA) is a bioactive compound found in milk that is derived from the phytol chain of chlorophyll, and the content of PA in milk fat depends on the availability of phytol from feed. In this study, the content of PA diastereomers was analyzed in milk sampled from five organic herds twice during the grazing season (May and September). The total content of PA was higher in September compared to May, but was not affected by breed (Danish Holstein or Danish Jersey). Total PA could not be directly related to intake of green feed items. The distribution between diastereomers was closely related to the amount of grazed clovers, where a higher intake resulted in a higher share of the RRR isomer.
authors.affiliation: Department of Food Science, Aarhus University, AU Foulum, Tjele, Denmark.
authors.forename: Brita N
authors.initials: BN
authors.lastname: Che
authors.forename: Troels
authors.initials: T
authors.lastname: Kristensen
authors.forename: Caroline
authors.initials: C
authors.lastname: Nebel
authors.forename: Trine K
authors.initials: TK
authors.lastname: Dalsgaard
authors.forename: Lars I
authors.initials: LI
authors.lastname: Hellgren
authors.forename: Jette F
authors.initials: JF
authors.lastname: Young
authors.forename: Mette K
authors.initials: MK
authors.lastname: Larsen
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D002417:Cattle; D005247:Feeding Behavior; D058870:Food, Organic / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry; D008892:Milk / Q000737:chemistry*; D010831:Phytanic Acid / Q000032:analysis* / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D010831:Phytanic Acid