以液相層析質譜儀分析 NSAID 藥物 - 卡普洛芬及那普洛辛之光解產物和鈣離子阻斷劑 - 尼卡迪平之光解產物

1. 以液相層析質譜儀分析NSAID藥物-卡普洛芬及那普洛辛之光解產物和鈣離子阻斷劑-尼卡迪平之光解產物以液相層析質譜儀分析NSAID藥物-卡普洛芬及那普洛辛之光解產物和鈣離子阻斷劑-尼卡迪平之光解產物 • 本研究使用液相層析質譜儀來分析兩類藥物照光後之光解產物，藉由解開光解產物構造以瞭解藥物照光後之可能反應過程。 • 第一部份以研究NSAID藥物包括卡普洛芬(CAP)及那普洛辛(NAP)。將卡普洛芬溶於甲醇以高壓汞燈照射(樣品I)或溶於10 %乙醇水溶液曝曬於太陽光下(樣品II)，則卡普洛芬carbazole環C6位置 氯之取代基照光後會進行去氯基反應(dechlorination)，且為光解反應中反應速率最快且最先生成之產物。CAPI經光解後生成CAPI-1至CAPI-7七種產物而CAPII生成CAPII-1至CAPII-4四種產物，觀察CAPI光解之特性乃溶媒(甲醇)效應係重要因素，如CAPI-3及CAPI-6乃甲基醚之衍生物；而CAPI-5及CAPI-7乃甲基酯之產物。卡普洛芬溶液光解仍以去羧基反應(decarboxylation)及後續之氧化反應(oxidation)為主要反應途徑。而那普洛辛(NAP)之甲醇溶液經高壓汞燈照射後可觀察到NAP-1至NAP-3三種光解產物。以上兩種NSAID藥物其光解反應過程亦予詳細闡明。 • 第二部分以研究鈣離子阻斷劑藥物，尼卡迪平(NIC)進行光解生成1,4-二氫吡啶芳香環化(aromatization)反應，它為反應速率最快且最先生成之反應，次要光解產物均由1,4-二氫吡啶環化產物所生成，且光解反應作用在長鏈酯上，而產生去甲基及去甲氧基光解產物，酯鏈則因照光水解為羧酸產物，因此我們得到在間位硝基苯基的尼卡迪平的光解需視其官能基之特性而產生。

2. Photolytic Studies of NSAIDs — Carprofen and Naproxen and Calcium Channel Blocker — Nicardipine by Liquid Chromatography/Electrospray Ionization/Mass Spectrometry • The scope of this research focused on the LC-MS analysis and studies of the photochemical decomposition products of two classes of drugs; namely NSAIDs and calcium channel blockers. The photochemical processes were thus understood by resolving and understanding the structures of the photodecomposition products. • The first part of this research involved the studies of NSAIDs-carprofen and naproxen. The methanol solution of carprofen (sample I) was subjected to high pressure Hg lamp irradiation and the 10% ethanol solution of carprofen (sample II) was subjected to natural sunlight. After the irradiation the chlorine at the C6 position in the carbazole ring of the carprofen molecule was lost due to photochemical dechlorination. It was also found that the dechlorination product was the major product from such processes. Seven major products CAPI-1 to CAPI-7 were formed from the photochemical decomposition of carprofen and 4 major products CAPII-1 to CAPII-4 were generated from the sample decomposition process. The studies demonstrated that methanol played a vital role in the decomposition where the methyl ether derivatives of CAPI-3 and CAPI-6, were formed and the methyl ester derivatives, CAPI-5 and CAPI-7 were yielded. The photodecomposition of carprofen solution was found to proceed via decarboxylation and subsequent oxidation as the major routes. The methanol solution of naproxen after high pressure Hg lamp irradiation formed 3 major products NAP-1 to NAP-3. The photochemical reaction route of these two NSAIDs will be elucidated. • The second part of this research involved the photochemical decomposition of the calcium channel blocker nicardipine which was found to be an aromatization reaction of 1,4-dihydropyridine. The aromatization reaction was showed to be the first process to occur. The subsequent photodecomposition products were generated from this first process. The long chain ester was decomposed to form the demethylation and demethoxylation products, whereas the ester group was hydrolyzed to form the corresponding carboxylic compounds. The photodecomposition of nicardipine containing a m-nitrobenzyl substituent was found to be dependent on the characteristics of the long chain ester functional groups in the molecule.