Highly sensitive detection of bovine β-lactoglobulin with wide linear dynamic range based on platinum nanoparticles probe.
Authors of this article are:
He S, Li X, Wu Y, Wu S, Wu Z, Yang A, Tong P, Yuan J, Gao J, Chen H.
A summary of the article is shown below:
Cows’ milk allergy is one of the most frequent and severe IgE-induce food allergies for children, demanding sensitive analytical methods, and β-lactoglobulin (BLG) can be as an important biomarker for detection of milk protein. In this study, a highly sensitive sandwich enzyme-linked immunosorbent assay (sELISA) based on a specific polyclonal antibody against human IgE linear epitopes of BLG and an anti-BLG polyclonal antibody-platinum nanoparticles probe was described for detection of BLG. This sELISA exhibited an ultra-wide linear range of 0.49-1.6 × 104 ng/mL, covering more than 4 orders of magnitude. The limit of detection was 0.12 ng/mL, which was 16-fold lower than that using traditional sELISA with the same antibodies. Furthermore, the proposed approach showed high recoveries (93.53%-111.95%) and low coefficient of variation (1.49%-12.50%) after analysis of samples fortified with BLG. The presence of allergenic BLG residues also could be detected in partially hydrolyzed infant formulas. These results, in comparison with conventional and commercial BLG detection sELISAs, highlight this proposed sELISA could be a reliable and user-friendly tool to monitor trace amounts of BLG and its potentially allergenic residues in foods.
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