Abstract
<p><strong>Objective: </strong>In the present communication, development and validation of reverse phase-high performance liquid chromatography method have been carried out for estimation of oxalate content in the urine of human volunteers with recurrent kidney stone disease and healthy status.</p><p><strong>Methods: </strong>The analysis of oxalic acid has been carried out on KYA TECH HiQ Sil C<sub>18</sub>HS column using a mobile phase of methanol: 0.001 N acetic acid in water (50:50, v/v) with a flow rate of 1 ml/min and detection wavelength, 237 nm.</p><p><strong>Results: </strong>Analysis of oxalate content was carried out using single point calibration method with retention at 2.705 min with good resolution parameters. Urine sample collected from kidney stone patients and healthy volunteers over the period of 24 h were analyzed and it has been found that concentration of oxalate in healthy volunteers is less than 12 µg/ml whereas that in case of kidney stone patients is in the range of 39-151 µg/ml and this data can be utilized for further interpretations about oxalate content in healthy and kidney stone diseased volunteers. This method was validated as per united states food and drug administration (USFDA) guidelines by the study of accuracy, precision, linearity, range, selectivity, the lower limit of quantitation, extraction recovery studies and stability studies for determining oxalate content in the urine of human volunteers. As relative standard deviations of oxalate content estimated are less than 5 percent, the method can be claimed accurate, precise, sensitive and selective for determining oxalate content in the urine of human volunteers.</p><p><strong>Conclusion: </strong>The results are satisfactory, proving the effectiveness of the method for analysis of oxalate content from other biological fluids with few optimizations.</p>
Highlights
Calcium oxalate is a chemical compound that forms envelope-shaped crystals, known in plants as raphides
Excess calcium or oxalate will be present in urine, but the formation of calcium oxalate crystals depends upon various types of factors like the saturation of urine with both components [5]
We have proposed new high-performance liquid chromatography (HPLC) method for estimation of oxalate from biological matrices without preanalysis sample preparation which would be simple, accurate, precise, sensitive and selective for the same and useful over the entire globe
Summary
Calcium oxalate is a chemical compound that forms envelope-shaped crystals, known in plants as raphides. It is a major constituent of human kidney stones, and found in beer stone, a scale that forms on containers used in breweries. Kidneys stone will occur in hypercalcemia or hyperoxalemia It will be a big question as various factors like age, gender, diet will be responsible for hyperoxaluria in the form of kidney stones [2,3,4]. Excess calcium or oxalate will be present in urine, but the formation of calcium oxalate crystals depends upon various types of factors like the saturation of urine with both components [5]. About 80% of stones are calcium based, and out of these, 80% of those are calcium oxalate stones [6]
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