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    Controlled flocculation prevents caking in bismuth subnitrate oral suspensions. Excipients like microcrystalline cellulose and sodium citrate enhance suspension stability and transmittance, crucial for efficacy and dosage.

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    Area of Science:

    • Pharmaceutical Sciences
    • Physical Chemistry
    • Materials Science

    Background:

    • Suspension stability is crucial for pharmaceutical efficacy and dosage.
    • Bismuth subnitrate, used in oral suspensions, tends to cake in aqueous media.
    • Predicting suspension stability theoretically is limited, especially regarding flocculation.

    Purpose of the Study:

    • To investigate controlled flocculation as a method to prevent caking in bismuth subnitrate suspensions.
    • To evaluate the impact of various excipients on suspension transmittance and sediment characteristics.
    • To identify optimal excipient combinations for stable bismuth subnitrate oral suspensions.

    Main Methods:

    • Theoretical estimation of suspension stability using Stokes equation.
    • Experimental determination of flocculation using the "jar test."
    • Evaluation of excipient effects (sodium citrate, Tween 20, propylene glycol, microcrystalline cellulose) on transmittance and sediment formation.

    Main Results:

    • Suspensions with sodium citrate, and those with both sodium citrate and microcrystalline cellulose, exhibited flocculating behavior.
    • Microcrystalline cellulose combined with 15% (w/w) sodium citrate yielded the highest transmittance, indicating optimal flocculation.
    • Excipients significantly influenced suspension transmittance and sediment characteristics.

    Conclusions:

    • Controlled flocculation is essential for preventing caking in bismuth subnitrate suspensions.
    • Microcrystalline cellulose and sodium citrate are effective in promoting stable, flocculated suspensions.
    • Optimized excipient formulations enhance physical stability and redispersibility of oral suspensions.