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Advisor(s)
Abstract(s)
The present work reports a nanodiamond-based voltammetric immunosensing platform
for the analysis of a food allergen (Ara h 1) present in peanuts (Arachis hypogaea). The possibility of
the usage of nanodiamonds (d = 11.2 ± 0.9 nm) on screen-printed carbon electrodes (SPCE/ND) in a
single-use two-monoclonal antibody sandwich assay was studied. An enhanced electroactive area
(~18%) was obtained and the biomolecule binding ability was improved when the 3D carbon-based
nanomaterial was used. The antibody-antigen interaction was recognized through the combination
of alkaline phosphatase with 3-indoxyl phosphate and silver ions. Linear Sweep Voltammetry (LSV)
was applied for fast signal acquisition and scanning electron microscopy (SEM) and energy dispersive
spectroscopy (EDS) support the voltammetric approach and confirm the presence of silver particles
on the electrode surface. The proposed immunosensor provided a low limit of detection (0.78
ng·mL−1) and highly precise (RSD < 7.5%) and accurate results. Quantification of Ara h 1 in commercial
foodstuffs (e.g., crackers, cookies, protein bars) that refer to the presence of peanuts (even traces)
on the product label was successfully achieved. The obtained data were in accordance with recovery
results (peanut addition, %) and the foodstuff label. Products with the preventive indication “may
contain traces” revealed the presence of peanuts lower than 0.1% (m/m). The method’s results were
validated by comparison with an enzyme-linked immunosorbent assay. This allows confident information
about the presence of allergens (even at trace levels) that leads to profitable conditions
for both industry and consumers.
Description
Keywords
Food allergen Ara h 1 Nanodiamonds Scanning electron microscopy Energy dispersive spectroscopy Voltammetric immunosensor Screen-printed electrode Peanut allergy Foodstuff
Citation
Publisher
MDPI