Liquid reagent of color former and method of stabilizing the...

Details Liquid reagent of color former and method of stabilizing the... Liquid reagent of color former and method of stabilizing the...

2007-01-18

2010-11-23

Wallenhorst, Maureen M (Department: 1797)

Chemistry: analytical and immunological testing

Including sample preparation

Stabilizing or preserving

C436S008000, C436S164000, C436S166000, C436S174000, C436S106000, C436S111000, C252S408100, C422S067000

Reexamination Certificate

active

07838304

ABSTRACT:
A liquid reagent in which a methylene blue compound color former is stably stored in a liquid state; and a method of stabilizing a methylene blue compound color former in a liquid state. A methylene blue compound color former is stabilized by causing it to coexist with either a quaternary ammonium compound having a C12or higher hydrocarbon chain or a salt thereof in a liquid medium. Examples of the methylene blue compound color former include 10-(carboxymethylaminocarbonyl)-3,7-bis(dimethylamino) phenothiazine.

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