Colorimetric bacteria sensing using a supramolecular enzyme-nanoparticle biosensor.
Colorimetric bacteria sensing using a supramolecular enzyme-nanoparticle biosensor.
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DOI:
10.1021/ja2021729
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发表时间:
2011-06-29
影响因子:
15
通讯作者:
Rotello, Vincent M.
中科院分区:
文献类型:
--
作者:
Miranda, Oscar R.;Li, Xiaoning;Garcia-Gonzalez, Limary;Zhu, Zheng-Jiang;Yan, Bo;Bunz, Uwe H. F.;Rotello, Vincent M.
Rapid and sensitive detection of pathogens is a key requirement for both environmental and clinical settings. We report here a colorimetric enzyme-nanoparticle conjugate system for detection of microbial contamination. In this approach cationic gold nanoparticles (NP) featuring quaternary amine head-groups are electrostatically bound to an enzyme (β-galactosidase, β-Gal), inhibiting enzyme activity. Analyte bacteria bind to the NP, releasing the β -Gal, restoring activity, and providing an enzyme-amplified colorimetric read-out of the binding event. Using this strategy we have been able to quantify bacteria at 1×102 bacteria/mL in solution and at 1×104 bacteria/mL in a field-friendly test strip format.
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