التفاصيل البيبلوغرافية
| العنوان: |
Dissolution profiles of high-dose salt-form drugs in bicarbonate buffer and phosphate buffer. |
| المؤلفون: |
Tarumi, Yuki1 (AUTHOR), Sugano, Kiyohiko1 (AUTHOR) suganok@fc.ritsumei.ac.jp |
| المصدر: |
Journal of Pharmaceutical Sciences. Jan2025, Vol. 114 Issue 1, p477-485. 9p. |
| مصطلحات موضوعية: |
*DRUG absorption, *BICARBONATE ions, *SUPERSATURATION, *VOLUMETRIC analysis, *SALT |
| مستخلص: |
The purpose of the present study was to compare the dissolution profiles of high-dose salt-form drugs in bicarbonate buffer (BCB) and phosphate buffer (PPB) focusing on the pH changes in the bulk phase. The pH titration curves of BCB and PPB (pH 6.5, buffer capacity (β) = 4.4 mmol/L/pH unit) were first theoretically calculated and experimentally validated. For dissolution tests, six drug salts with an acid counterion, one drug salt with a weak base counterion, and one free acid drug were employed (125–800 mg clinical dose). The dose/fluid volume ratio (Dose / FV) was aligned with the clinical condition. In the pH titration study, the pH value decreased below pH 6.0 by adding HCl > 2.8 mmol/L (BCB) or > 1.6 mmol/L (PPB) and increased above pH 7.0 by adding NaOH > 2.0 mmol/L (BCB) or > 2.4 mmol/L (PPB). In the dissolution test, even though the initial pH and β values were the same, the pH value at 4 h was lower in PPB than in BCB in all cases. For the drug salts with an acid counterion, the area under the dissolution curve was 1.2 to 2.6-fold lower in BCB than in PPB. A marked precipitation process was observed in BCB, but less pronounced or absent in PPB. The results of this study suggest the use of BCB and a clinically equivalent Dose / FV may be valuable in predicting the oral absorption of high-dose drug salts. [Display omitted] • Dissolution profiles of high-dose salt-form drugs were investigated in physiological bicarbonate buffer (BCB) and phosphate buffer (PPB). • The dissolution profile in BCB was significantly different from that in PPB in all cases. • The pH value at 4 h was lower in PPB than in BCB in all cases. • This study supports the use of BCB and a clinically equivalent dose/fluid volume value to predict the oral absorption of high-dose drug salts. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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