Patent ID: 7491540
Filing Date: 2009-02-17
Classification: C12Q,G01N,Y10S,Y10T

Abstract:
1. An aqueous reagent composition consisting essentially of: (a) water; (b) piperazine-N,N′-bis(2-ethanesulfonic acid) at a concentration between about 10 mM and about 200 mM; (c) an electrolyte comprising a pH buffer selected from the group consisting of tris(hydroxymethyl)aminomethane, glycylglycine, phosphate and combinations thereof, wherein the concentration of the pH buffer is between about 40 mM and about 1000 mM; and (d) a phenyl ether-containing surfactant; wherein said reagent composition has a pH between about 6.5 and about 8.5.