Reagent for blood analysis and method of using the same

A reagent for blood analysis, said reagent comprising:

• (1) a compound having the general formula I:
• wherein
• R1 and R2 are each independently selected from at least one of the following:
• C1-18alkylCOOR6, C1-18alkylOR6 and benzyl, wherein said benzyl is optionally substituted with a substituent selected from at least one of the following:
• halogen, hydroxyl, sulfhydryl, cyano, nitro, alkyl, aryl, alkyloxy, heterocyclyl, haloalkyl, amino, alkylamino, amido and carboxyl, provided that R1 and R2 are not all simultaneously benzyl;
• R6 in each occurrence is independently H, C1-18alkyl or phenyl, wherein said phenyl is optionally substituted with a substituent selected from at least one of the following:
• halogen, hydroxyl, sulfhydryl, cyano, nitro, alkyl, aryl, alkyloxy, heterocyclyl, haloalkyl, amino, alkylamino, amido and carboxyl;
• X is CH2, C(CH3)2, O, S or Se;
• Y is —CH—CH═CH—,
• are each independently
• R3, R4 and R5 are each independently selected from at least one of the following:
• H, halogen, cyano, hydroxyl, C1-18alkyl, C1-18alkylsulphonyl, sulphonyl and C1-5alkylCOOR7, provided that R3 are not simultaneously sulphonyl when Y is —CH—CH═CH— and
• are simultaneously
• R7 is H or C1-6alkyl;
• and
• Z− is an anion;
• and
• (2) at least one surfactant selected from cationic surfactants and nonionic surfactants.