Capillary electrophoresis of sialylated oligosaccharides in milk from different species

•Sialylated oligosaccharides are important components of human milk.•They are highly considered for their positive effect on human health.•Oligosaccharide content of non-human milk has not been so well studied.•Capillary electrophoresis was a valuable technique to study sialylated oligosaccharides.•3-Siallyllactose showed the highest relative concentration in all milk samples.