Liquid reagent of color former and method of stabilizing the same
AssigneeARKRAY, Inc.
InventorsSatoshi Yonehara, Norio Inamura
Life of this patent
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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 C12 or 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.
Claims6
A liquid reagent, comprising:
- a methylene blue-based color former, the methylene blue-based color former is 10-(carboxymethylaminocarbonyl)-3,7-bis(dimethylamino)phenothiazine or 10-(acetylaminocarbonyl)-3,7-bis(dimethylamino)phenothiazine;
- a quaternary ammonium having hydrocarbon chains with a carbon number of 12 or higher or a salt of the quaternary ammonium;
- and
- a liquid medium.
A method of stabilizing a liquid reagent containing a methylene blue-based color former, the methylene blue-based color former is 10-(carboxy methylaminocarbonyl)-3,7-bis(dimethylamino)phenothiazine or 10-(acetylaminocarbonyl)-3,7-bis(dimethylamino)phenothiazine, and a quaternary ammonium having hydrocarbon chains with a carbon number of 12 or higher or a salt of the quaternary ammonium, the method comprising:
- putting the color former and quaternary ammonium together in a liquid medium.
Dependencies are inferred from the claim text.