Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 76, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1834698
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Many proteins fold through intermediates that are populated in the submillisecond time regime. To monitor directly the formation of these kinetic intermediates, we have developed a simple, robust, easy to assemble continuous flow mixer for studying folding reactions in the 35-1000 mus time regime. The mixer is constructed by laser-machining 75-mum channels in a 127-mum-thick polyimide or polyetheretherketone polymer wafer. Mixing times of similar to25 to similar to50 mus can be achieved for a 1/10 dilution reaction of 8 M urea with flow rates of 10-20 mL/min. CCD-based steady-state and time-correlated single-photon-counting-based fluorescence detection strategies are described. Preliminary results on the early events in the refolding of cytochrome c are presented. (C) 2005 American Institute of Physics.
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