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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

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Rapid and ultra-sensitive determination of enzyme activities using surface-enhanced resonance Raman scattering

Moore, B.D. and Stevenson, L. and Watt, A. and Flitsch, S. and Turner, N.J. and Cassidy, C. and Graham, D. (2004) Rapid and ultra-sensitive determination of enzyme activities using surface-enhanced resonance Raman scattering. Nature Biotechnology, 22 (9). pp. 1133-1138. ISSN 1087-0156

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Abstract

Measurement of enzyme activity and selectivity at in vivo concentrations is highly desirable in a range of fields including diagnostics, functional proteomics and directed evolution. Here we demonstrate how surface-enhanced resonance Raman scattering (SERRS), measured using silver nanoparticles, can be used to detect the activity of hydrolases at ultra-low levels. This approach was made possible by designing 'masked' enzyme substrates that are initially completely undetected by SERRS. Turnover of the substrate by the enzyme leads to the release of a surface targeting dye, and intense SERRS signals proportional to enzyme activity are generated. The method was used to rapidly screen the relative activities and enantioselectivities of fourteen enzymes including examples of lipases, esterases and proteases. In the current format the sensitivity of the technique is sufficient to detect 500 enzyme molecules, which offers the potential to detect multiple enzyme activities simultaneously and at levels found within single cells.