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A comparison between enzyme immunoassay and HPLC for ochratoxin A detection in green, roasted and instant coffee BABT
Fujii,Simone; Ono,Elisabete Yurie Sataque; Ribeiro,Ricardo Marcelo Reche; Assunção,Fernanda Garcia Algarte; Takabayashi,Cássia Reika; Oliveira,Tereza Cristina Rocha Moreira de; Itano,Eiko Nakagawa; Ueno,Yoshio; Kawamura,Osamu; Hirooka,Elisa Yoko.
An indirect competitive enzyme-linked immunosorbent assay (ic-ELISA) for ochratoxin A (OTA) detection in green, roasted and instant coffees was developed using anti-OTA monoclonal antibody. Immunological reagents prepared were OTA-BSA (4.76 mg/mL), anti-OTA.7 MAb (2x10³-fold dilution) and HRP-anti IgG (10³-fold dilution). The detection limit was 3.73 ng OTA/g and correlation coefficients (r) between this immunoassay and high performance liquid chromatography were 0.98 for green coffee, 0.98 for roasted and 0.86 for instant. OTA levels detected by ic-ELISA were higher than by HPLC, with ELISA/HPLC ratio of 0.66 - 1.46 (green coffee), 0.96 - 1.11 (roasted) and 0.93 - 1.82 (instant). ELISA recoveries for OTA added to coffee (5 - 70 ng/g) were 81.53 % for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ochratoxin; Immunoassay; HPLC; Monoclonal antibody; Coffee.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200020
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