J. Lopez-tapia et al., Detection of the presence of soya protein in milk powder by sodium dodecylsulfate capillary electrophoresis, J CHROMAT A, 836(1), 1999, pp. 153-160
Two different commercial kits for sodium dodecyl sulfate capillary electrop
horesis (SDS-CE) were evaluated for the detection of the presence of soya p
rotein in milk powder. The results obtained showed that SDS-CE allowed the
separation of the basic subunits of glycinin and the alpha and alpha' subun
its of beta-conglycinin from the main milk protein peaks. However, a detect
ion limit lower than 10% (w/w) of soya protein in total protein could not b
e achieved. The use of a tetraborate-EDTA sample treatment minimized interf
erences from milk proteins, allowing the detection of at least 1% (w/w) of
soya protein in total protein. The addition of soya protein hydrolysates co
uld not be determined using SDS-CE. (C) 1999 Elsevier Science B.V. All righ
ts reserved.