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Noninvasive dissolution measurement using perturbed angular correlation

R M Beihn, G A Digenis

    Journal of Pharmaceutical Sciences
    |December 1, 1981
    PubMed
    Summary

    A new noninvasive method uses indium 111 and perturbed angular correlation to measure drug dissolution. This technique tracks changes in nuclear interactions to determine dissolution rates in solid dosage forms.

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    Area of Science:

    • Nuclear Physics
    • Pharmaceutical Sciences
    • Biomedical Engineering

    Background:

    • Dissolution testing is crucial for solid dosage form efficacy.
    • Current methods for measuring dissolution can be invasive or indirect.
    • A noninvasive technique is needed to accurately assess drug release.

    Purpose of the Study:

    • To develop and validate a novel noninvasive technique for measuring the dissolution of water-soluble components in solid dosage forms.
    • To utilize indium 111 and perturbed angular correlation (PAC) for real-time dissolution monitoring.
    • To demonstrate the applicability of PAC in both in vitro and in vivo settings.

    Main Methods:

    • The technique employs time-delayed coincidence counting of cascading gamma-rays from indium 111.
    • Nuclear angular correlation is perturbed by environmental interactions, such as phase changes during dissolution.
    • Changes in anisotropy, a measure of angular correlation perturbation, directly correlate with dissolution progression.

    Main Results:

    • Low anisotropy values (0.02-0.04) indicate a highly perturbed solid state.
    • Increasing anisotropy values signify the dissolution process.
    • Anisotropy reaches 0.14-0.15 in the fully unperturbed liquid state, confirming dissolution completion.

    Conclusions:

    • Perturbed angular correlation with indium 111 offers a novel, noninvasive method for dissolution measurement.
    • The technique accurately quantifies dissolution rates in solid dosage forms.
    • This method shows promise for both laboratory (in vitro) and clinical (in vivo) applications in pharmaceutical development and patient monitoring.

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