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A novel disposable and portable electrochemical aptasensor based on reduced graphene oxide (RGO) was constructed for the detection of mercury (II) (Hg2+) using methylene blue (MB) as the signal tag and exonuclease III‐induced cyclic reaction as signal amplification strategy. RGO was utilized as a carrier to immobilize MB‐DNA, and screen‐printed electrode (SPE) was used as the substrate electrode....
A sensitively electrochemical aptasensor was developed to detect zearalenone, utilizing DNA assembly based on hybridization chain reaction to amplify the signal current and exonuclease III to reduce the background current. The linear range 5.0×10−5 ng/mL‐50 ng/mL, and the limit of detection is 0.013 pg/mL. The fabricated aptasensor showed the high specificity toward aflatoxin B1 (AFB1), fumonisin...
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