Micellar Properties of Drugs: Determination of Molecular Weight, Size, and Molecular Interactions of Drug Micelles Using the Analytical Ultracentrifuge

1974 ◽  
Vol 63 (6) ◽  
pp. 981-987 ◽  
Author(s):  
Joel Kirschbaum
Keyword(s):  
Molecular Weight ◽  
Molecular Interactions ◽  
Analytical Ultracentrifuge ◽  
Micellar Properties

scholarly journals Studies on Polydisperse Systems Using an Air-Driven Ultracentrifuge: Application to Phosphatidylcholine Vesicles

1979 ◽  
Vol 32 (2) ◽  
pp. 187 ◽  
Author(s):  
RG Clarke ◽  
GR Eagle ◽  
GJ Howlett
Keyword(s):  
Molecular Weight ◽  
Specific Volume ◽  
High Speed ◽  
Theoretical Calculations ◽  
Analytical Ultracentrifuge ◽  
Solution Density ◽  
Good Agreement

A high-speed air-driven ultracentrifuge (Airfuge) has been used to determine the molecular weight and effective specific volume of phosphatidylcholine vesicles. The method used to determine the effective specific volume involved varying the solution density until zero sedimentation of the vesicles occurred. The value obtained for the effective specific volume of 0�9885 mlJg agrees well with previously reported values. The determination of the molecular weight of the vesicles is based on a method in which the fraction of vesicles remaining in an upper fraction of the solution column is compared with the values obtained using standard proteins. The values obtained for the molecular weight of the vesicles range from 1� 7 x 106 to 2�3 X 106 and are in good agreement with results obtained using the analytical ultracentrifuge and with previously reported results. Possible effects due to the polydispersity of the solute are assessed using theoretical calculations and the possibility of using the Airfuge for the study of other polydisperse systems is discussed.

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