Patent ID: 7824919
Filing Date: 2010-11-02
Classification: A61K,G01N,Y10T

Abstract:
1. A chemical analysis method for the determination of RO(CH 2 CH 2 O) n H, RO(C 2 H 4 O) n A having a molecular weight greater than 5,000 grams per mole, and AO(C 2 H 4 O) n A in a mixture thereof, wherein R is an alkyl group, A is a functional group for coupling with a surface or a biologically active material or other thing of use and n is an integer greater than 100, comprising the step of: chromatographing a sample of the mixture by reverse phase liquid chromatography under critical conditions to determine the relative amounts of RO(CH 2 CH 2 O) n H, RO(C 2 H 4 O) n A, and AO(C 2 H 4 O) n A in the mixture.