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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
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Optical Detection of E. coli Bacteria by Mesoporous Silicon Biosensors
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[Applicability of bisphenol A detection by a planar waveguide fluorescent biosensor].

Wei-cqi Xu, Yong-ming Zhang, Xiao-hong Zhou

    Huan Jing Ke Xue= Huanjing Kexue
    |April 23, 2015
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    A new planar waveguide fluorescent biosensor offers sensitive detection of bisphenol A (BPA), an environmental endocrine disruptor, in water. This method shows potential for practical environmental monitoring of BPA levels.

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    Area of Science:

    • Environmental Science
    • Analytical Chemistry
    • Biotechnology

    Background:

    • Bisphenol A (BPA) is a widely recognized environmental endocrine disruptor.
    • Accurate and sensitive detection of BPA in water is crucial for environmental and health monitoring.

    Purpose of the Study:

    • To develop and validate a planar waveguide fluorescent biosensor for the rapid and sensitive determination of bisphenol A in water samples.

    Main Methods:

    • Optimization of test conditions for the planar waveguide fluorescent biosensor.
    • Determination of the detection limit, linear response range, and IC50 for BPA.
    • Assessment of interference from water hardness using EDTA.
    • Validation of the method using real water samples.

    Main Results:

    • The biosensor achieved a detection limit of (0.04 +/- 0.007) microg/L for BPA.
    • The linear response range was 0.16 microg/L to 22.40 microg/L, with an IC50 of (1.67 +/- 0.47) microg/L.
    • Recovery ratios in real water samples ranged from 88% to 111% with R.S.D. < 15%, indicating method reliability.

    Conclusions:

    • The planar waveguide fluorescent biosensor provides a sensitive and rapid method for detecting bisphenol A in water.
    • The method is robust, with minimal interference from water hardness and good recovery rates in real samples.
    • This biosensor demonstrates significant potential for practical environmental monitoring of BPA contamination.