Abstract
A label-free nanoparticle array platform has been used to detect total peanut allergen-specific binding from whole serum of patients suffering from peanut allergy. The serum from 10 patients was screened against a four-allergen panel of cat and dog dander, dust mite and peanut allergen protein Ara h1. The IgE and IgG contributions to the total specific-binding protein load to Ara h1 were identified using two secondary IgG- and IgE-specific antibodies and were found to contribute less than 50 % of the total specific protein load. The total mass of IgE, IgE and the unresolved specific-binding protein ΔsBP for Ara h1 provides a new serum profile for high-RAST-grade patients 5 and 6 with the IgG/IgE ratio of 4 ± 2 and ΔsBP/IgE ratio of 17 ± 11, neither of which is protective for the small patient cohort.
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