title: Improvement of polymerase chain reaction-based Bt11 maize detection method by reduction of non-specific amplification.
abstract: The Bt11 maize-specific qualitative detection method based on polymerase chain reaction (PCR) in the JAS analytical test handbook has been widely used for administrative monitoring of GM crops and quality control of commercially distributed grains. In the present investigation, some apparently false-positive detections were observed in assays using the Bt11 maize-specific method, and these erroneous results were proved to have been caused by non-specific DNA amplification. We improved the detection method to reduce non-specific amplification by decreasing the concentration of magnesium ions in the PCR mixture. The subsequent evaluation of analytical performance demonstrated no marked difference between the currently used and the improved methods, except for the reduced non-specific amplification. We conclude that the currently used standard method should be replaced with the improved method for the reliable detection of Bt11 maize.
authors.affiliation: National Food Research Institute, 2-1-12 Kannondai, Tsukuba, Ibaraki 305-8642, Japan.
authors.forename: Junichi
authors.initials: J
authors.lastname: Mano
authors.forename: Yuka
authors.initials: Y
authors.lastname: Yanaka
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Akiyama
authors.forename: Reiko
authors.initials: R
authors.lastname: Teshima
authors.forename: Satoshi
authors.initials: S
authors.lastname: Furui
authors.forename: Kazumi
authors.initials: K
authors.lastname: Kitta
mesh_terms: D002523:Edible Grain / Q000737:chemistry*; D005189:False Positive Reactions; D005504:Food Analysis / Q000379:methods*; D030841:Food, Genetically Modified; D016133:Polymerase Chain Reaction / Q000379:methods*