Journal: Food Chemistry: Molecular Sciences
Article Title: Usage of nanobody-beta-galactosidase fusion in immunoassays and its application in detecting a peanut allergen
doi: 10.1016/j.fochms.2026.100357
Figure Lengend Snippet: β-Gal detection of the association between its fusion partner Nb16 and Ara h 3 by ELISA. The utility of β-gal as a colorimetric enzyme in ELISA was assessed. Nb16-βgal association with Ara h 3 coated on the surface of the wells, but not with the control proteins, was detected. (A) SDS-PAGE analysis of Ara h 3 and control proteins used to coat the microplate. Nonreduced (lane 1) and reduced (lane 2) Ara h 3 were separated on a 4–12% SDS gel and stained with CBB. Chicken allergen Gal d 2 (lane 3) and cow's milk allergen Bos d 4 (lane 4) were included as control samples. The molecular masses (in kDa) of the proteins in the marker (lane M) are shown on the right side of the gel images. (B) The kinetic curves of the signal readout during plate incubation after the β-gal substrate ONPG was added. The black line shows the average signal of the wells incubated with TBS during the coating step. Red, green, and blue lines show the average signals of the wells coated with Gal d 2, Bos d 4, and Ara h 3, respectively. All the coating samples were at a concentration of 20 μg/mL. (C) A bar representation of β-gal detection in the ELISA experiment using the endpoint data. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
Article Snippet: Milli-Q water was purified in-house using a Milli-Q Advantage A10 system (Millipore, Bedford, MA, USA) and used throughout. o -Nitrophenyl-β-galactoside (ONPG), Isopropyl β-D-1-thiogalactopyranoside (IPTG), Kanamycin (Kan), and X-Gal were purchased from GoldBio (St Louis, MO, USA).
Techniques: Enzyme-linked Immunosorbent Assay, Control, SDS Page, SDS-Gel, Staining, Marker, Incubation, Concentration Assay