Dual-label time-resolved fluoroimmunoassay for simultaneous detection of aflatoxin B1 and ochratoxin A.
A dual-label time-resolved fluoroimmunoassay (TRFIA) for simultaneous quantification of aflatoxin B1 (AFB1) and ochratoxin A (OTA) is described. For this, microtitration wells were coated with AFB1-horse radish peroxidase (HRP) and OTA-bovine serum albumin. The standards and samples were loaded on the coated plates, and diluted antibodies and Eu3+- and Sm3+-labeled IgG were then added. Our results showed that the sensitivity of TRFIA for AFB1 was 0.02 microg/L (range 0.02-100 microg/L). The intra- and inter-batch coefficient of variation (CV) was 3.2 and 7.3%, respectively, and the average recovery rate was 88.1%. On the other hand, the sensitivity of OTA was 0.05 microg/L (range 0.05-50 microg/L), the intra- and inter-batch CV was 2.9 and 7.9%, respectively, and the average recovery rate was 89.9%. In the AFB1/OTA-TRFIA, AFB1 and OTA did not mutually interfere. The correlation coefficients between the dual-label AFB1/OTA-TRFIA and the single-label AFB1-TRFIA or OTA-TRFIA were 0.972 and 0.981, respectively, indicating that the results were consistent. Our study suggests that AFB1/OTA-TRFIA allows the simultaneous detection of AFB1 and OTA; is a simple, fast, and economic method for screening large quantities of samples, and has good prospects of application.
Huang
Biao
B
Jiangsu Institute of Nuclear Medicine, 214063 Wuxi, Jiangsu, China. huangbiao78@hotmail.com
Xiao
Hualong
H
Zhang
Jue
J
Zhang
Lianfen
L
Yang
Hailin
H
Zhang
Yi
Y
Jin
Jian
J
D016604:Aflatoxin B1 / Q000032:analysis*; D000818:Animals; D015200:Fluoroimmunoassay / Q000379:methods*; D005504:Food Analysis / Q000379:methods; D005506:Food Contamination / Q000032:analysis; D006735:Horseradish Peroxidase / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D009183:Mycotoxins / Q000032:analysis*; D009793:Ochratoxins / Q000032:analysis*; D011817:Rabbits; D012710:Serum Albumin, Bovine / Q000276:immunology
D009183:Mycotoxins; D009793:Ochratoxins; C025589:ochratoxin A; D012710:Serum Albumin, Bovine; D016604:Aflatoxin B1; D006735:Horseradish Peroxidase