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Continuous-channel flow linear dichroism

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Cheng, Xi, Joseph, Maxim B., Covington, James A., Dafforn, Timothy R., Hicks, Matthew R. and Rodger, Alison (2012) Continuous-channel flow linear dichroism. Analytical Methods, Vol.4 (No.10). pp. 3169-3173. doi:10.1039/c2ay25513h

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Official URL: http://dx.doi.org/10.1039/c2ay25513h

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Abstract

Linear dichroism (LD) is the difference in absorbance of light polarized parallel to a sample orientation axis and polarized perpendicular to it. Flow LD provides information about samples with high enough aspect ratios to be oriented in a flow stream. It is particularly useful for studying DNA-ligand systems, protein fibres and membrane assemblies and is the ideal technique for monitoring growth or destruction of particles. Standard Couette flow cells are limited to a dead time in kinetic processes of similar to 40 s (the assembly time). Recently an injection Couette flow cell has reduced the dead time to similar to 600 ms. In this paper we report an alternative system, based on syringe drives, 3 alternative flow-through cells, and the optical system of a Biologic MOS-450 spectrometer that has been adapted for LD. This system can reduce the dead time to 25 ms. The sample requirement is similar to 100 mu L per time point. Less sample is required for longer dead times. The system has been applied to measure the kinetics of DNase digestion of DNA and GTP-induced polymerization of the bacterial cell division protein FtsZ.

Item Type: Journal Article
Divisions: Faculty of Science, Engineering and Medicine > Science > Chemistry
Faculty of Science, Engineering and Medicine > Engineering > Engineering
Faculty of Science, Engineering and Medicine > Research Centres > Molecular Organisation and Assembly in Cells (MOAC)
Journal or Publication Title: Analytical Methods
Publisher: Royal Society of Chemistry
ISSN: 1759-9660
Official Date: October 2012
Dates:
DateEvent
October 2012Published
Volume: Vol.4
Number: No.10
Page Range: pp. 3169-3173
DOI: 10.1039/c2ay25513h
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access

Data sourced from Thomson Reuters' Web of Knowledge

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