Stable liquid control serum or calibration system for use in clinical diagnostics
First Claim
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1. Liquid composition useful as a control serum or a calibration serum, comprising:
- (a) a serum sample containing a known concentration of at least one analyte, and(b) a liquid stable bilirubin derivative of formula;
##STR2## wherein X stands for oxygen or sulfurR stands for a C1 -C6 alkyl group which is mono- or polysubstituted with carboxy, alkoxy carbonyl, hydroxy, mercapto, amino, alkylamino, dialkylamino or alkylcarbonylamino andY stands for amino, alkylamino, dialkylamino, hydroxy, alkoxy groups, or the alkali salts thereof wherein said composition does not contain bilirubin.
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Abstract
A stable liquid control and/or calibration serum for use in clinical diagnostics containing a liquid-stable bilirubin derivative and a known concentration of at least one analyte. The invention further addresses a process for the preparation of the stable liquid serum.
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19 Claims
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1. Liquid composition useful as a control serum or a calibration serum, comprising:
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(a) a serum sample containing a known concentration of at least one analyte, and (b) a liquid stable bilirubin derivative of formula;
##STR2## wherein X stands for oxygen or sulfurR stands for a C1 -C6 alkyl group which is mono- or polysubstituted with carboxy, alkoxy carbonyl, hydroxy, mercapto, amino, alkylamino, dialkylamino or alkylcarbonylamino and Y stands for amino, alkylamino, dialkylamino, hydroxy, alkoxy groups, or the alkali salts thereof wherein said composition does not contain bilirubin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. Process for improving storage stability of a control serum or calibration serum wherein said serum does not contain bilirubin, comprising adding to said control serum or calibration serum an amount of a compound of formula ##STR3## wherein X stands for oxygen or sulfur
R stands for a C1 -C6 alkyl group which is mono- or polysubstituted with carboxy, alkoxy carbonyl, hydroxy, mercapto, amino, alkylamino, dialkylamino or alkylcarbonylamino and Y stands for amino, alkylamino, dialkylamino, hydroxy, alkoxy groups, or the alkali salts thereof in an amount sufficient to stabilize said control serum or calibration serum.
Specification