Comparative study of the protein fraction of goat milk from the Indigenous Greek breed and from international breeds
2008
Moatsou, Golfo | Moschopoulou, E. | Mollé, Daniel | Gagnaire, Valérie | Kandarakis, I. | Léonil, Joëlle | Laboratory of Dairy Research, Department of Food Science and Technology ; Agricultural University of Athens | Science et Technologie du Lait et de l'Oeuf (STLO) ; Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST
Individual goat milk samples, taken from animals of the Indigenous Greek breed and from the international breeds Saanen and Alpine, were studied by RP-HPLC regarding the qualitative and quantitative characteristics of their proteins. Thirty-two samples from the Indigenous Greek breed and 17 from the international breeds were characterised further by RP-HPLC/ESI-MS. The mean total protein content of the milk samples from the Greek breed was higher 38.8 g/l, compared to 31.9 g/l of those from international breeds, due to the great difference between their mean as1-Cn contents (6.90 and 3.02 g/l, respectively). In the milk samples of the Greek breed, the strong as1-Cn variants B3, B4 and As/B1 predominated, whereas in the milk samples from international breeds the medium variant E and the defectives F and null predominated. Variant A of as2-Cn followed by variant C and the j-Cn D (former B) were the most abundant in both groups. as2-Cn F and the rare j-Cn variant C/B were observed in the milk samples from the Greek breed. The b-caseins A and C were present in both groups of samples. Finally, the level of phosphorylation of the different genotypes is showed.
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