IM-CCA
CCA030-140718
718E
FOR RESEARCH USE ONLY

Catalog #CCA-030#030

MC Reagent Biochemical Assay Series

Calcium Assay Kit
O-Cresolphtalein
Cresolphtalein (OCPC) Chromogenic method
Biochemical
Bioc mical Significance and Test Summary
Calcium is the most abundant and one of the most important minerals in the human body. Approximately 99% ofbody calcium is found in bones. The calcium level in the extracellular space is in dynamic equi
equilibrium
ium with bone
calcium. Calcium ions affect the contractility of heart and skeletal muscles and are essential for the function of thenervous system. Calcium ion
ions play an important role in blood clotting and bone minimization.
miization. In plasma, calcium
is bound to a considerable extent to proteins, 10 % is in the form of inorganic complexes and 50 % is present as
free ion species
species.. The calcium homeostasis regulated by the parathyroid hormone (PTH), calcitriol (CT), andcalcitonin.
calciA decrease in albumin level causes a decrease in serum calcium. Low levels of calcium are found in
hypoparathyroidism, pseudohypoparathyroidism, vitamin D deficiency, malnutrition and intestinal malabsortion.
Among causes of hypercalcemia are cancers,cancers, large intake of vitamin D, enhanced renal retention, osteoporosis,sarcosidosis, thyrotoxicosis,hyrotoxicosis, hyperparathyroidism.
hyperparathyroidism.
This product is a direct colorimetric assay kit without deproteinization
eproteinization of the sample. Calcium with o-cresolphtaleo cresolphtale(as chelator) at strong alkaline pH, yields a violet colored complex. The intensity of the color formed is
proportional to the calcium concentration in the samplesample.

1. Kit contents (for 200 tests)
R-1
R-2
STD

BufferChelate color
10 mg/dL Ca standard

1 x 38 mL
1 x 10 mL
1 x 1.0 mL

Ready to use
Ready to use
Ready to use*Storage conditions: Store at 2-8°C.
2
Don’t freeze
freeze.
*Expiration:*Expiration: 1 year. After the vials are opened, the kit should be used in one month.
month*Measuring range
range: 0.2-30
30 mg/dL

2. Materials required but not provided(1) Distilled water(2) Micropipettors and pipette tips
(3) Clear flatflat-bottom 96-well
well plate(4) Microplate reader with 570 nm capability
apability

3. Assay preparation
Bring allll reagents to room temperature before use.

4. Sample preparation
Serum/Plasma:
Serum/Plasma: Insoluble substances in serum and plasma samples should be removed by filtration orcentrifugation. EDTA
EDTA-plasma
plasma cannot be used.
Urine (24 hour pooled urine)
urine): Dilute the sample 1/2 in distilled water. Add 6M HCl to the diluted sample andadjust pH 2.0
2.0-3.0 (e.g. 5--10µL of 6M HCl/ 1mL of lysate). Centrifuge at 6,000 rpm for 15 minminutes.. Collect thesupernatant and use it for assay.
Biological fluid: Add 6M HCl to the sample and adjust pH 2.0
2.0-3.0 (e.g. 5--10µL of 6M H
HCl/Cl/ 1mL of lysate).
Centrifuge at 6,000 rpm for 15 min
minutesutes.. Collect the supernatant and use it for assay.
Tissue: Add 3%% TCA solution, vortex
vo tex for 1 minuteute and incubate for 30 minutes
minat 4-8°C.
8°C. Centrifuge at 6,000 rpm
for 15 minutes
minutes.. Collect the supernatant and use it for assay.
Note: Sample pH should be between pH 2 and pH 8.

5. Assay protocol(1) Add 5 µL of Distilled water
water(Blank)/(Blank)/STD(Standard)/(Standard)/Sample
ample into each well.

(2) Add 190 µL
L of RR-1
1 to each well and incubate for 5 min
minutes at room temperature.
(3) Add 50 µL
L of RR-2
2 to each well and incubate for 5 min
minutes at room temperature.
(4) Read the absorbance at 570 nm (560560-590 nm).. ----- OD

6.. Calculations
ΔODStandard = ODStandard - ODBlank, ∆ODSample = ODSample - ODBlank
Calcium (mg/dL) =ΔΔODSample/Δ
ΔODStandard x 10
Calcium (mM) ==ΔOD
ODSample/ΔOD
ODStandard x 2.495(Assay example)
DW (Blank)
StandardSample

OD (570570 nm)
0.677
1.116
0.976

ΔOD
0.439
0.299

Calcium (mg/L)
6.81

ΔODStandard = 1.116 - 0.677 = 0.439
ΔODSample = 0.976 - 0.677 = 0.299
CalciumSample = ∆ODSample/∆ODStandard x 10 = (0.299/0.439
0.299/0.439) x 10 = 6.81 (mg/dL)
CalciumSample (µM)M) = ∆OD∆ Sample/∆OD/∆ Standard x 2.495 = (0.299/0.439
0.299/0.439) x 2.495 = 1.70 (mM)

7.. Interferences
EDTA inhibits ccalcium to chromogenic system. The test is not affected by presence of bilirubinbilirubin-F and bilirubin-CCup to 40 mg/dL and chyle up to 1,000 FTU.
FT

8.. Quality Control
Use of control sera is recommended to monitor the quality of assay results.

9.. Reference(1)1) J. W. Ferguson, J. J. Richard, J. W. O'laughlin and C. V. Banks: Simultaneous Spectrophotometric
Determination of Calcium and Magnesium
Magnesium with Chlorophosphonazo
Chlorophosphonazo-III, Anal. Chem,Chem, 36, 796.2
2 (1962).
(22) Harold. V,, Connerty. MD, Anglis. R, Briggs. BS: Determination of serum calcium by means oforthocresolphthalein complexone. Am J Clin Pathol , 45, p290
290-296 (19661966).
(33) Fujita.
ujita. T, Noguchi. K, Terashima. I : Apoplastic mesophyll signals induce rapid stomatal responses to CO 2 inCommelina communis
communis,, New Phytol,, 199(2), p395
p395-406
406 (2012).

10.
10. Technical support & troubleshooting(1) Unstableness of incubation temperature may result in unstable results.
(2) Use disposable test tube and glassware washed with 1M HNO 3 or 1M HCl, and rinse with distilled water.
(3) Accuracy to the microliter is important to obtain good results. Ensure maximum precision when pipetting.
(4) Temperature for the chromogenic
chromogen reaction may affect the optical density.
density It may be necessary to adjust the reaction timedepending on the room temperature.
(5) High
High concentration of proteins or lipid inn cell lysate or in tissue extract may affect the observed value. Please remove themby ultrafiltration or centrifugation.
(6) 24 hour pooled urine
urine:: Dilute the sample 1/2
1/ in distilled water. Mix. Mu
Multiply results by 2 (dilution factor) for assay sample.

Japan Institute for the Control of Aging (JaICA),
Nikken SEIL Co., Ltd.
Haruoka 710-1,
710 1, Fukuroi, Shizuoka 437
437-0122,0122, Japan
TEL: +81-538-49+8149-0125 FAX:
FAX +81-538-49
49-1267
www.jaica.com/e/ E-mail: biotech@jaica.com(Supported languages: Japanese and English)