PURPOSE: To effectively prevent the turbidity of a humor sample derived not only from a lipid protein but also from a θ-globulin protein by mixing a sulfonate or carboxylate expressed by a specific formula in the body fluid sample.
CONSTITUTION: The sulfonate mixed in a body fluid sample is expressed by Formula I, where (m) represents a number from 1 to 6, and the carboxylate mixed in the body fluid sample is expressed by Formula II, where (n) represents a number from 3 to 9. In case a sulfonate having an (m) of ≥7 or carboxylate having an (n) of ≤2 is used, the preventing speed of the turbidity of the body fluid sample derived from a γ-globulin protein does not become sufficiently higher. In addition, use of a carboxylate having an (n) of ≥10 is not disagreeable, because the Krafft point becomes higher and the carboxylate itself becomes cloudy. The M in Formulae I and II represent a cationic residual group and an alkali metal is preferable. A preferable sulfate and carboxylate include methane sodium sulfonate, sodium caprylate, etc., and blood plasmas and blood serums are specially referable from the humor sample.
SUGIZAKI SATOSHI
HASEGAWA TERUAKI
