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US 8,784,748 B2Granted
Dry test strip for measuring calcium
AssigneeARKRAY, Inc.
InventorTsutomu Nakamura
Life of this patent
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Abstract
A dry test strip for measuring calcium is comprising a support, a reagent layer provided on the support, and a reagent holding layer provided on the reagent layer, and containing, as reagents, o-cresolphthalene complexone, a magnesium selective masking agent, and a pH buffer for adjusting the pH of the environment for reaction of the o-cresolphthalene complexone with calcium to 10.0-11.0, wherein such reagents are present in either the reagent layer or the reagent holding layer or the both layers.
Claims15
A dry test strip for measuring calcium which is comprising:
- o-cresolphthalene complexone,
- a magnesium selective masking agent, and
- a pH buffer for adjusting the pH of the environment for reaction of the o-cresolphthalene complexone with calcium to 10.0-11.0,
- wherein the pH buffer is at least one selected from the group consisting of N-methyl-D-glucamine alone and N-methyl-D-glucamine in combination with N-cyclohexyl-3-aminopropanesulfonic acid.
1 more element
Dependencies are inferred from the claim text.