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  • Title: Development of novel measurement assay for calcium in serum by the chlorophosphonazo-III vanadate method.
    Author: Noda K, Sato Y, Miura T, Katayama K, Kojima R.
    Journal: Ann Clin Biochem; 2010 Sep; 47(Pt 5):440-6. PubMed ID: 20595405.
    Abstract:
    BACKGROUND: Chlorophosphonazo-III (2,7-bis[4-chloro-2-phosphonophenylazo]-1,8-dihydroxy-3,6-naphthalenedisulphonic acid, disodium salt; CPZ-III) reacts with calcium and magnesium in a sample under acidic to neutral conditions. However, the specific method of measuring calcium in serum using CPZ-III has not been established because of the difficulty of avoiding the interaction between CPZ-III and albumin. METHODS: In this study, we found that the non-specific reaction between CPZ-III and albumin could be controlled and calcium in serum could be specifically detected using CPZ-III combined with vanadate. On the basis of this finding, we evaluated a novel method of serum calcium determination using CPZ-III. RESULTS: This CPZ-III vanadate method gave linear results from 0 to 7.0 mmol/L. The coefficient of variation was 0.63-0.76%. There was no interference except with Omniscan. There was no change in control performance during 60 d under open-air conditions. The assay results correlated well with those of the Arsenazo-III (2,7-bis(2-arsonophenylazo)-1,8-dihydroxy-3,6-naphthalenedisulphonic acid) method (slope = 1.067; intercept = -0.120; r = 0.989; Sy/x = 0.036 mmol/L), o-cresolphthalein complexone method (slope = 0.911; intercept = 0.186; r = 0.988; Sy/x = 0.035 mmol/L), amylase enzymatic method (slope = 0.981; intercept = 0.072; r = 0.989; Sy/x = 0.036 mmol/L) and inductively coupled plasma emission spectroscopy method (slope = 0.955; intercept = -0.001; r = 0.979; Sy/x = 0.048 mmol/L). CONCLUSIONS: These results suggested that the present method has great clinical potential for measuring calcium.
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