Universal and Ultrasensitive Immunochromatographic Assay by Using an Antigen as a Bifunctional Element and Antialbumin Antibody on a Test Line.
Anal Chem
; 91(15): 9530-9537, 2019 08 06.
Article
de En
| MEDLINE
| ID: mdl-31282654
ABSTRACT
A universal and ultrasensitive immunochromatographic assay (ICA) was established using antigen as a bifunctional element and antialbumin antibody in a test line. Preincubation was introduced for competitive recognition. After optimization, the linear detection of aflatoxin M1 (AFM1) with quantum dot bead (QB)-based ICA (QB-ICA) sensor ranged from 10 to 52 pg mL-1, with a 50% inhibitory concentration (IC50) of 23 pg mL-1, which was nearly 49.6-fold lower than those of ICA on a traditional structure with traditional pretreatment (IC50 = 1.10 ng mL-1) and 10-fold lower than those of ICA on a traditional structure with acid aid pretreatment (IC50 = 0.25 ng mL-1). The limit of detection (LOD) for AFM1 was 16 pg mL-1 in milk, which was approximately 16.3-fold times higher than those of ICA on a traditional structure with traditional pretreatment and 6.3-fold higher than those of ICA on a traditional structure with acid aid pretreatment. The LOD improved by 20-fold by using the proposed structure compared to that of conventional enzyme-linked immunosorbent assay (ELISA) for AFM1-spiked milk samples (IC10 = 0.12 ng mL-1). The performance and practicability of the established QB-ICA sensor were validated with a commercial ELISA kit. To evaluate universality, we successfully detected chloramphenicol, with IC50 of 0.42 ng mL-1. Given its high sensitivity and universality, the proposed QB-ICA can be used as an alternative for rapid, sensitive, and universal quantitative detection of all small-molecule analytes.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Sujet principal:
Dosage immunologique
/
Aflatoxine M1
/
Lait
/
Albumines
/
Anticorps
/
Antigènes
Type d'étude:
Diagnostic_studies
Limites:
Animals
Langue:
En
Journal:
Anal Chem
Année:
2019
Type de document:
Article