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US 4,393,134 AGranted
Standard blood filter paper for use in diagnosis of histidinemia
AssigneeFujizoki Pharmaceutical Co., Ltd.
InventorsAkira Yano, Yoshitada Saito, Yasushi Kasahara
Life of this patent
Estimating the term…
Abstract
A standard blood filter paper for use in diagnosis of histidinemia, comprising a piece of filter paper, and a blood material infiltrated in the above filter paper containing a known concentration of histidine and at least one salt selected from the group consisting of a dithionite, a disulfite and a bisulfite. The standard blood filter paper can be preserved for a long term at -20.degree. C.
Claims7
A standard blood filter paper for measuring the concentration of histidine in the blood, comprising:
- a piece of filter paper, and
- a blood material, infiltrated in said filter paper, containing a known concentration of histidine and at least one salt selected from the group consisting of a dithionite, a disulfite and a bisulfite in an amount effective to preserve said histidine.
Dependencies are inferred from the claim text.