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題 名 | Differential Electrolytic Potentiometric Titration of Vitamin C in Pharmaceutical Preparations=製藥中維生素C之差異電解質電位滴定法 |
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作 者 | Al-ghannam, Sheikha M.; Al-olyan, Abeer M.; | 書刊名 | 藥物食品分析 |
卷 期 | 13:4 2005.12[民94.12] |
頁 次 | 頁295-300+393 |
分類號 | 418.4 |
關鍵詞 | 差異電解質電位滴定法; 氧化滴定分析; 維生素C; 鈰; 製藥; Differential electrolytic potentiometry; Oxidation titrimetry; Vitamin C; Cerium; IV; Pharmaceutical preparations; |
語 文 | 英文(English) |
中文摘要 | 直流差異電解質電位原理應用在維生素c之水溶性滴定已被研究。鈰(IV)與維生素c之反應快速足以使後者在0.09 M硫酸介質中直接滴定。硫酸鈰銨作為滴定用標準液,一組白金電極作為指示系統。所得到之滴定曲線幾乎對稱且有銳利之波峰。最適之電流密度為0.65 μA cm-2。此程序已成功地應用在商業化錠劑、膠囊以及果汁中0.02~10 ppm維生素c之檢測。這項研究結果與官方檢測方法相比是令人滿意的。 |
英文摘要 | The application of direct current differential electrolytic potentiometry for the aqueous titration of vitamin C has been investigated. The reaction of vitamin C with Ce (IV) is fast enough to permit its direct titration in 0.09 M sulfuric acid media. Cerium ammonium sulfate was used as a titrant and a couple of platinum electrodes as an indicating system. Titration curve shapes obtained are almost symmetrical with sharp peaks. The optimum current density was found to be 0.65 µA cm-2. The procedure was applied successfully to the determination of vitamin C in commercial tablets, capsules as well as in juice in the concentrations of 0.02~10 ppm. The results of this study were favorably compared statistically with those obtained with official methods. |
本系統中英文摘要資訊取自各篇刊載內容。