title: Detection of bisphenol A using palm-size NanoAptamer analyzer.
abstract: We have demonstrated a palm-size NanoAptamer analyzer capable of detecting bisphenol A (BPA) at environmentally relevant concentrations (<1ng/mL or ppb). It is designed for performing reaction and fluorescence measurement on single cuvette sample. Modified NanoGene assay was used as the sensing mechanism where signaling DNA and QD655was tethered to QD565and magnetic bead via the aptamer. Aptamer affinity with BPA resulted in the release of the signaling DNA and QD655from the complex and hence corresponding decrease in QD655fluorescence measurement signal. Baseline characterization was first performed with empty cuvettes, quantum dots and magnetic beads under near-ideal conditions to establish essential functionality of the NanoAptamer analyzer. Duration of incubation time, number of rinse cycles, and necessity of cuvette vibration were also investigated. In order to demonstrate the capability of the NanoAptamer analyzer to detect BPA, samples with BPA concentrations ranging from 0.0005 to 1.0ng/mL (ppb) were used. The performance of the NanoAptamer analyzer was further examined by using laboratory protocol and commercial spectrofluorometer as reference. Correlation between NanoAptamer analyzer and laboratory protocol as well as commercial spectrofluorometer was evaluated via correlation plots and correlation coefficients.
authors.affiliation: Department of Environmental Science and Engineering, Ewha Womans University, Seoul, Republic of Korea.
authors.forename: Hyun Jeong
authors.initials: HJ
authors.lastname: Lim
authors.affiliation: School of Electrical Engineering, Korea University, Seoul, Republic of Korea. Electronic address: chuabeelee@gmail.com.
authors.forename: Beelee
authors.initials: B
authors.lastname: Chua
authors.affiliation: Department of Environmental Science and Engineering, Ewha Womans University, Seoul, Republic of Korea. Electronic address: ahjeong.son@gmail.com.
authors.forename: Ahjeong
authors.initials: A
authors.lastname: Son
mesh_terms: D052157:Aptamers, Nucleotide / Q000737:chemistry*; D001559:Benzhydryl Compounds / Q000302:isolation & purification* / Q000633:toxicity; D015374:Biosensing Techniques / Q000295:instrumentation*; D005453:Fluorescence; D006801:Humans; D057230:Limit of Detection; D010636:Phenols / Q000302:isolation & purification* / Q000633:toxicity; D045663:Quantum Dots / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D000098826:Bisphenol A Compounds
chemical_list: D052157:Aptamers, Nucleotide; D001559:Benzhydryl Compounds; D010636:Phenols; D014874:Water Pollutants, Chemical; C006780:bisphenol A; D000098826:Bisphenol A Compounds
keywords: Aptamer; Bisphenol A (BPA); Fluorescence measurement; Magnetic bead; NanoAptamer analyzer; Quantum dots