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Concentration analysis of nutritionally important proteins from milk

Application Note #162


Concentrations of proteins were determined from milk and milk-based infant formula using Multi-Parametric Surface Plasmon Resonance (MP-SPR) instrument. α-Lactalbumin (ALAB) is a nutritionally important protein for infants, and immunoglobulin G (IgG) is an important part of the secondary immune response. Concentrations of unknown samples were determined based on calibration curves. The assay was a direct binding assay using an anti-ALAB antibody or anti-IgG immobilized on the surface. The same assay format can be used to detect other similar proteins of interest such as antibiotic residues, toxins, allergens or nutrients.

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Further reading

  • If you are interested in reading more, see AN#160 about bacteria detection from powdered milk.
  • Do you want to find out how to calculate thickness out of MP-SPR measurements? Click here
  • Do you want to see how MP-SPR instruments work? Click here
  • Do you want to see MP-SPR instruments comparison? Click here