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Related Experiment Videos

Colorimetric prednisolone assay and its application to dissolution studies.

L C Kwan, H Schott

    Journal of Pharmaceutical Sciences
    |February 1, 1984
    PubMed
    Summary

    This study adapted the Porter and Silber colorimetric method for prednisolone assay, optimizing conditions and correcting for surfactant interference. The validated method offers high sensitivity and precision for prednisolone quantification.

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    Area of Science:

    • Analytical Chemistry
    • Pharmaceutical Analysis

    Background:

    • The Porter and Silber colorimetric method is established for corticosteroid analysis.
    • Prednisolone is a widely used corticosteroid with therapeutic applications.
    • Assessing prednisolone concentrations requires accurate and sensitive analytical methods.

    Purpose of the Study:

    • To adapt and validate the Porter and Silber colorimetric method for prednisolone quantification.
    • To evaluate the method's performance in the presence and absence of octoxynol 9, a surfactant.
    • To establish optimal reaction conditions for accurate prednisolone measurement.

    Main Methods:

    • Adaptation of the Porter and Silber colorimetric assay for prednisolone.
    • Optimization of reaction time (30 min) and temperature (50°C) with acidified phenylhydrazine.

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  • Correction for octoxynol 9 interference by adjusting blank absorbance.
  • Determination of sensitivity, precision, and relative standard deviation.

    • Main Results:

    • Optimal colorimetric reaction conditions identified as 30 minutes at 50°C.
    • Octoxynol 9 interference effectively managed by using an equal surfactant concentration in the blank.
    • Method sensitivity achieved at 0.2 µg/mL and precision at 0.1 µg/mL.
    • Average relative standard deviation of 3.7% for prednisolone concentrations between 10-300 µg/mL.

    Conclusions:

    • The adapted colorimetric method provides a sensitive and precise assay for prednisolone.
    • The method is robust, accommodating the presence of the surfactant octoxynol 9.
    • This validated assay is suitable for pharmaceutical analysis and quality control of prednisolone formulations.