英文摘要 |
Lansoprazole (LNS) and omeprazole (OMP) are therapeutically important drugs, and the need arose for a simple, reliable method for their content uniformity of their tablets. The anodic polarographic behavior of lansoprazole and omeprazole has been studied in Britton-Robinson buffer (BRb) over the pH range 4.1-11.5. In BRb of pH 7 well-defined anodic waves were produced with diffusion-current constant (Id) of 1.70 ± 0.01 (n = 6) and 1.66 ± 0.01 (n = 8) for LNS and OMP, respectively. The current-concentration plots were rectilinear over the ranges of 4-24, 2-16 μg mL-1 using Direct Current (DCt) mode for LNS and OMP, respectively and over the range 2-18, 0.4-12 μg mL-1 using the Differential Pulse Polarographic (DPP) mode for LNS and OMP, respectively. The detection limits (S/N = 2) using DPP mode were 0.2 μg mL-1 (5.41 × 10-7 M) and of 0.05 μg mL-1 (1.45 × 10-7 M) for LNS and OMP, respectively. The proposed method was successfully applied to the analysis of the two drugs in their commercial capsules. The average percent recoveries were favorably compared to those obtained by reference methods, with satisfactory standard deviations. A pathway for the electrode reaction in both cases was postulated. The proposed method is characterized by being simple, accurate and stability-indicating.
Lansoprazole (LNS)與Omeprazole (OMP)兩者為醫療上舉足輕重的藥劑, 確實需要一種簡單、可靠的方法來分析與確保其在錠劑中的成分均一性。在pH 4.1-11.55 之Britton-Robinson緩衝溶液(BRb)中,LNS及OMP的陽極極譜表現已被研究。在pH 7之BRb中,LNS及OMP的擴散電流常數(ID)分別為1.70 ± 0.01 (n = 6 )及1.66 ± 0.01 (n = 8)時,產生了明確的陽極波。在LNS及OMP的濃度範園分別為4-24 及早16μg mL-1 的條件下,利用直流電(DCt)模式,以及在LNS及OMP的濃度範圍分別為2-18及0.4-12時mL-1 的條件下,利用主鑑別脈動式極譜分析(DPP)模式, 所得到的電流-濃度關係圖示均呈線性。DPP模式對LNS及OMP的檢測極(S/N = 2)分別為0.2 μg mL-1 (5.41 × 10-7 M)及0.05μg mL-1 (1.45 × 10-7 M)。這項被提出的方法,已經成功地應用在商業化藥片中LNS及OMP的分析。在令人滿意的標準偏差下,本分析方法較參考方法有更佳的平均百分比回收率。兩種情況的電極反應路徑被假設, 結果顯示所提出的方法是簡單、準確與再現性佳之分析方法。 |