Cited Article: Holt JK. Fast mass transport through sub-2-nanometer carbon nanotubes
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Number of Citing Articles: 1 new records this week (1 in this e-mail)
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AU Ma, CB
Yeung, ES
AF Ma, Changbei
Yeung, Edward S.
TI Single Molecule Imaging of Protein Molecules in Nanopores
SO ANALYTICAL CHEMISTRY
LA English
DT Article
ID SIZE-EXCLUSION CHROMATOGRAPHY; SELF-ASSEMBLED MONOLAYERS;
DNA-MOLECULES; NANOTUBE MEMBRANES; ULTRAFILTRATION MEMBRANES;
CAPILLARY-ELECTROPHORESIS; FLUORESCENCE MICROSCOPY; LIQUID/SOLID
INTERFACES; INDIVIDUAL MOLECULES; LATERAL DIFFUSION
AB The interactions between single protein molecules and nanoporous
polycarbonate membranes were investigated at the single molecule level.
Entrapment of proteins was shown to be size selective and was dependent
on the membrane pore diameter. A pore size that is only slightly larger
than the maximum dimension of the proteins was inadequate for intrusion
into the pores. For a given protein, the number of molecules found at a
given depth decreased as the pore size decreased. In addition, as the
depth increased, for a given size pore, the number of molecules
decreased rapidly. The depth-dependent histograms nicely fit a
one-dimensional diffusion model. However, a highly restricted motion
was observed even when the pore diameter was 10 times the size of the
protein, resulting in anomalously small diffusion coefficients. We also
demonstrated the subtle differences in depth distribution among BSA and
hemoglobin that have nearly the same molecular weight but slightly
different molecular shapes. These results give unique insights into the
detailed mechanism of size-exclusion chromatography and membrane
filtration.
C1 [Yeung, Edward S.] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA.
Iowa State Univ, Dept Chem, Ames, IA 50011 USA.
RP Yeung, ES, Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA.
EM yeung@ameslab.gov
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NR 67
TC 0
PU AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0003-2700
DI 10.1021/ac902487c
PD JAN 15
VL 82
IS 2
BP 478
EP 482
SC Chemistry, Analytical
GA 542HR
UT ISI:000273484200006
ER
EF
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