Table 2.

Secondary structure of bovine and caprine β-caseins in the presence or in the absence of polysorbate-20.

β-Casein/Polysorbate-20 Samples
Conformational Element *	Bovine β-Casein	Bovine β-Casein/PS-20 1	Caprine β-Casein	Caprine β-Casein/PS-20
α-helix (%)	13.5	16.8	14.2	17.8
β-strand (%)	17.9	21.0	16.8	22.5
Irregular (%)	69.1	62.7	70.3	61.6

¹ PS-20, polysorbate-20. * Analysis of secondary structure of β-casein/PS-20 samples was processed by the CAPITO program [20].