期刊
ANALYTICAL CHEMISTRY
卷 85, 期 9, 页码 4761-4769出版社
AMER CHEMICAL SOC
DOI: 10.1021/ac400480z
关键词
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资金
- European Research Council
- EPSRC
- EU
- BBSRC Enterprise fellowship
- EPSRC [EP/H046593/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H046593/1] Funding Source: researchfish
The ability to miniaturize biochemical assays in water-in-oil emulsion droplets allows a massive scale down of reaction volumes, so that high-throughput experimentation can be performed more economically and more efficiently. Generating such droplets in compartment-on-demand (COD) platforms is the basis for rapid, automated screening of chemical and biological libraries with minimal volume consumption. Herein, we describe the implementation of such a COD platform to perform high precision nanoliter assays. The coupling of a COD platform to a droplet absorbance detection set-up results in a fully automated analytical system. Michaelis-Menten parameters of 4-nitrophenyl glucopyranoside hydrolysis by sweet almond beta-glucosidase can be generated based on 24 time-courses taken at different substrate concentrations with a total volume consumption of only 1.4 mu L. Importantly, kinetic parameters can be derived in a fully unsupervised manner within 20 min: droplet production (S min), initial reading of the droplet sequence (5 min), and droplet fusion to initiate the reaction and read-out over time (10 min). Similarly, the inhibition of the enzymatic reaction by conduritol B epoxide and 1-deoxynojirimycin was measured, and K-i values were determined In both cases, the kinetic parameters obtained in droplets were identical within error to values obtained in titer plates, despite a >10(4)-fold volume reduction, from micro- to nanoliters.
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