Patent ID: 11867703
Assignee: CHUNDO PHARM CO., LTD
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. A method of producing a test strip for detecting a calcium concentration in a sample obtained from a biological subject, the method comprising:
impregnating paper with a mixed solution of a primary reagent and a secondary reagent, followed by drying,
wherein the first reagent is prepared by dissolving o-cresolphthalein complexone (OCPC), sodium lauryl sulphate (SDS), polyvinylpyrrolidone (PVP), and a compound for selectively masking magnesium in an organic solvent, followed by further adding an organic acid thereto, and
the second reagent is prepared by adding a pH buffer for adjusting a pH to 10.0 to 11.0 during the reaction between calcium in the sample and OCPC of the primary reagent, 2,7-bis(2-arsonophenylazo) chromotropic acid, and Triton x-100 to distilled water.