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Competitive and double antibody sandwich elisa for the quantification of lactoferrins by using monoclonal and chicken egg yolk IgY antibodies.

Two effective competitive and double antibody sandwich ELISA based on monoclonal (MAb) and chicken egg yolk IgY antibodies were developed to determine lactoferrin (LF) content in infant and milk formulas. Leghorn laying hens were immunized with purified bovine and human LFs to produce anti-bovine LF and anti-human LF IgY antibody in the egg yolk. After 5-8 weeks of the immunization, anti-LF IgY was extracted and analyzed by ELISA. Specific IgY antibodies against LFs cross reacted with human and bovine LFs, examined by ELISA and western-blot assay. Such cross-reactivity suggested the presence of common antigenic determinants between human and bovine LFs. An indirect competitive ELISA was preferred to quantify LF in milk and infant formulas, since the range of detection is 3.125-50 μg/mL, which is broader compared to the biotinylated ELISA system (5-50 ng/mL). As per the indirect competitive ELISA system, IgY at a concentration of the 150 μg/mL was incubated with various concentrations of bovine LF ranged from 0.003-100 μg/mL. The immunoassay was used to estimate the total bovine LF content in the milk samples and infant formulas, ranging from 49.28-80.96 μg/mL and 29.92-60.00 μg/mL, respectively.[1]

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