Abstract

An electrochemical biosensor for specific detection of DNA sequences from Aspergillus, a potentially aflatoxigenic fungus is reported. The detection technique was optimized using short DNA sequences, then applied for a 92-mer from the Aspergillus gene aflR that codes a biochemical pathway of aflatoxin B1 production. Voltammetric detection of the specific Aspergillus DNA sequence is based on hybridization of adsorbed target DNA with a biotinylated probe and subsequent binding with streptavidin alkaline phosphatase conjugate. Such modified electrode surface of carbon paste electrode (CPE) is incubated in a buffer with an electrochemically inactive substrate (1-naphthyl phosphate). Alkaline phosphatase converts 1-naphthyl phosphate into 1-naphthol, which is determined by the selected voltammetric technique. The optimized procedure provided good differentiation between complementary and noncomplementary probes and also between potentially aflatoxigenic and non-aflatoxigenic fungi of the genus Aspergillus.

Full Text
Paper version not known

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.