title: A spectrophotometric procedure for DNA assay with a micro-sequential injection lab-on-valve meso-fluidic system.
abstract: A micro-sequential injection spectrophotometric procedure for DNA assay was developed based on the employment of a lab-on-valve (LOV) meso-fluidic analytical system. A small amount of crystal violet solution (10mul) was de-colored inside the flow cell of the LOV at the presence of 5mul lambda-DNA/HindIII within a certain pH range, and the absorbance decrease of crystal violet solution at 591nm was measured via optical fibers and was employed as the basis of quantification. A uni-variant approach was adopted for the optimization of experimental parameters, including buffer pH, concentration and volume of crystal violet solution, reaction time and sample/reagent loading flow rates. A linear calibration graph was obtained within 0.2-6.0mugml(-1), along with a detection limit of 0.07mugml(-1). The procedure was applied for the determination of lambda-DNA/HindIII in synthetic samples in comparison with a documented procedure.
authors.affiliation: Research Center for Analytical Sciences, Wenhua Road 3-11, Box 332, Northeastern University, Shenyang 110004, PR China.
authors.forename: Xuwei
authors.initials: X
authors.lastname: Chen
authors.forename: Jianhua
authors.initials: J
authors.lastname: Wang
authors.forename: Zhaolun
authors.initials: Z
authors.lastname: Fang