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Articles by K Shiba
Total Records ( 2 ) for K Shiba
  E Hokazono , S Osawa , T Nakano , Y Kawamoto , Y Oguchi , T Hotta , Y Kayamori , D Kang , Y Cho , K Shiba and K. Sato

Although serum calcium has been measured using the o-cresolphthalein complexone (oCPC) method in the clinical laboratory, this method still has some problems regarding linearity and reagent stability. We developed a new measurement procedure using chlorophosphonazo-III (CPZ-III: 2,7-bis (4-chloro-2-phosphonophenylazo) -1,8- dihydroxy-3, 6-naphthalenedisulphonic acid, disodium salt) as a chelator with an acid medium for serum calcium measurement. The present method showed better linearity and reagent stability compared with the oCPC method.


Characteristics were studied in optimized conditions measuring wavelength by absorption spectra analysis, and interference of protein and metals with Mg2+, Fe2+, Cu2+ and Zn2+. The method was applied to an automated analyser (7170; Hitachi High Technologies Corp). The measurement performance was evaluated for accuracy, precision, recovery rate, linearity and reagent stability with a comparison study against atomic absorption spectrophotometry (AAS).


The within-run and between-run variations (coefficient of variation [CV]) were 0.92–1.01% and 0.75–1.43%, respectively. The linearity was 0–7.0 mmol/L. The comparison study obtained y = 1.002x (AAS) – 0.10, Sy/x = 0.18 mmol/L, n = 50. Reagent stability was at least 20 d at 4°C without daily calibration.


The new calcium measurement method in serum was demonstrated to have reliable and acceptable performances as a routine test in clinical laboratory.

  N Matsuda , S Sato , K Shiba , K Okatsu , K Saisho , C. A Gautier , Y. s Sou , S Saiki , S Kawajiri , F Sato , M Kimura , M Komatsu , N Hattori and K. Tanaka

Defective mitochondrial quality control is shown to be a mechanism for neurodegeneration in some forms of Parkinson's disease.

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