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Identification of caseins in goat milk
Author(s) -
Roncada Paola,
Gaviraghi Alessandro,
Liberatori Sabrina,
Canas Benito,
Bini Luca,
Greppi Gian Franco
Publication year - 2002
Publication title -
proteomics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.26
H-Index - 167
eISSN - 1615-9861
pISSN - 1615-9853
DOI - 10.1002/1615-9861(200206)2:6<723::aid-prot723>3.0.co;2-i
Subject(s) - allele , casein , biology , null allele , locus (genetics) , food science , alpha (finance) , genetics , medicine , gene , construct validity , nursing , patient satisfaction
The importance of goat milk in infant diet is growing, because it is reported that goat's milk in some cases is less allergenic than cow's milk. This is due probably to the lower presence of caseins associated with a specific type of α s1 ‐casein. In caprine breeds, four types of α s1 ‐casein alleles are identified and associated with various amounts of this protein in milk. The contribution of strong alleles to the goat milk is approximately 3.6 g/L of α s1 ‐casein, while for middle alleles is only 1.6 g/L, weak alleles 0.6 g/L. The contribution of null allele is very low (or non‐existent). The quantity of total caseins in caprine milk is positively correlated with the amount of α s1 ‐casein. Milk from animals possessing strong alleles contain significantly more total caseins than milk from animals without those alleles. This is important because animals with mild alleles can be employed to produce milk for allergic subjects while the other animals can be used to produce milk for the dairy industry. This work shows casein profiles of two types of classified goat milk (B, strong α s1 allele, 0, null α s1 allele) with two‐dimensional electrophoresis coupled with matrix‐assisted laser desorption/ionization‐time of flight mass spectrometry, and it confirms the different polymorphisms at locus α s1 casein.