2026-08-20T06:02:30Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/941912025-01-27T18:55:47Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Cruz, Silvia de la author Cubillos-Zapata, Carolina author López-Calleja, Inés María author Ghosh, Satyabrata author Alcocer, Marcos author González Alonso, María Isabel author Martín De Santos, María Del Rosario author García Lacarra, Teresa author 2015 Tree nut allergies are considered an important health issue in developed countries. To comply with the regulations on food labeling, reliable allergen detection methods are required. In this work we isolated almond-specific recombinant antibody fragments (scFv) from a commercial phage display library bypassing the use of live animals, hence being consistent with the latest policies on animal welfare. To this end an iterative selection procedure employing the Tomlinson I phage display library and a crude almond protein extract was carried out. Two different almond-specific scFv (named PD1F6 and PD2C9) were isolated after two rounds of biopanning, and an indirect phage ELISA was implemented to detect the presence of almond protein in foodstuffs. The isolated scFvs demonstrated to be highly specific and allowed detection of 40 ng mL−1 and 100 ng mL−1 of raw and roasted almond protein, respectively. The practical detection limit of the assay in almond spiked food products was 0.1 mg g−1 (110–120 ppm). The developed indirect phage ELISA was validated by analysis of 92 commercial food products, showing good correlation with the results obtained by a previously developed real-time PCR method for the detection of almond in foodstuffs. The selected phage clones can be affinity maturated to improve their sensitivity and genetically engineered to be employed in different assay formats. de la Cruz, S., Cubillos-Zapata, C., López-Calleja, I. M., Ghosh, S., Alcocer, M., González, I., Martín, R., & García, T. (2015). Isolation of recombinant antibody fragments (scFv) by phage display technology for detection of almond allergens in food products. Food Control, 54, 322-330. https://doi.org/10.1016/J.FOODCONT.2015.02.011 0956-7135 10.1016/j.foodcont.2015.02.011 https://hdl.handle.net/20.500.14352/94191 1873-7129 https://www.doi.org/10.1016/j.foodcont.2015.02.011 https://www.sciencedirect.com/science/article/pii/S0956713515000924 Isolation of recombinant antibody fragments (scFv) by phage display technology for detection of almond allergens in food products