共查询到16条相似文献,搜索用时 62 毫秒
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8种氨基糖苷类抗生素的电喷雾离子阱质谱 总被引:1,自引:0,他引:1
目的探讨8种结构相似的氨基糖苷类抗生素的质谱裂解规律。方法在正离子检测方式下,用电喷雾离子阱质谱法对庆大霉素、小诺霉素、西索霉素、依替米星、奈替米星、威替米星、卡那霉素A和妥布霉素进行多级质谱分析。结果各化合物在二级质谱分析时,均可发生B环与C环之间的糖苷键断裂,生成脱去C环(氨基葡萄糖)的碎片离子m/z 322(庆大霉素、小诺霉素和西索霉素)、m/z 350(依替米星、奈替米星和威替米星)和m/z 324(卡那霉素和妥布霉素);在三级质谱分析时,则进一步发生A环(氨基葡萄糖)与B环(脱氧链霉胺)之间的糖苷键断裂,生成A环或B环的碎片离子m/z 163和 m/z 191或m/z 160和m/z 162。 结论通过多级质谱分析可获得氨基糖苷类抗生素分子丰富的结构信息,并可用于该类化合物的快速结构解析和定量分析。 相似文献
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14种氨基糖苷类抗生素质谱分析 总被引:3,自引:0,他引:3
目的:探讨氨基糖苷类抗生素质谱裂解规律。方法:在正离子检测方式下,对14种氨基糖苷类抗生素分别进行ESI-MS^n和APCI—MS^n质谱分析。结果:多级质谱分析时,2-脱氧链霉胺双取代衍生物(小诺霉素、庆大霉素、西索米星、依替米星、奈替米星、阿米卡星、卡那霉素A、卡那霉素B、妥布霉素、新霉素、巴龙霉素和核糖霉素)均先脱去C环或D环(氨基葡萄糖);再进一步发生A环(氨基葡萄糖)与B环(脱氧链霉胺)之间的糖苷键断裂;大观霉素可能首先在B环的异侧C-O键间断裂生成m/z189的碎片离子,再脱去羟基和甲基生成m/z158的离子,或在B环2个C-O键同侧断裂并脱去羟基和甲氨基生成m/z158的二级碎片离子;链霉素可产生二级碎片m/z407(脱去C环)、m/z320(脱去A,环)的离子,三级质谱中m/z407生成m/z390、m/z263(A,环碎片)、m/z246(A环链霉胍)和m/z221(再脱去一胍基部分)的离子。结论:质谱分析可获得氨基糖苷类抗生素丰富的结构信息,归纳其质谱裂解规律可用于对该类化合物的结构解析和有关物质结构分析。 相似文献
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蛋白质及多肽的液相色谱-电喷雾离子化质谱研究进展 总被引:4,自引:0,他引:4
蛋白质及多肽的液相色谱电喷雾离子化质谱研究进展徐友宣彭师奇(北京医科大学生源药物化学中德联合实验室,北京100083)多肽及蛋白质药物对临床的重要性,已引起各国药物化学界的广泛重视。在多肽或蛋白质药物的结构研究中,MS研究有重要价值。例如FABM... 相似文献
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液相色谱/电喷雾质谱联用分析金霉素中的杂质组分 总被引:2,自引:0,他引:2
目的应用液相色谱-电喷雾离子化质谱法分析金霉素杂质组分。方法用MerckC8(250×4.6mm,5μm)色谱柱;流动相0.01m草酸-乙腈(20∶80,V/V,pH2.0);流速1mL·min-1;检测波长375nm;液相出口分流20%进入离子阱质谱,以电喷雾电离源正离子模式(MS+)进行质谱数据采集。结果得到金霉素样品液相色谱图以及液相色谱峰对应的一级质谱图。对谱图进行分析归纳,推测金霉素样品中含有四环素、差向异构四环素和差向异构金霉素杂质组分。结论本方法灵敏、可靠、快速,对四环素类抗生素生产、质量监控具有指导意义。 相似文献
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目的:对奥硝唑有关物质进行分析。方法:采用液相色谱-电喷雾离子化.质谱联用分析技术,Luna C18柱(4.6mm×250mm,5μm);以pH3.5甲酸水溶液:乙腈(80:20)为流动相;DAD检测器检测波长为318nm;柱温25℃;流速1mL·min^-1,柱后分流;进样量20μL。质谱离子源为ESI,雾化气压力30psi,干燥气流量8L/min,干燥温度350℃,质谱扫描质量范围50~1200。采用全扫描一级质谱(full scan)和选择离子全扫描二级质谱(full scan MS/MS)两种方式同时测定。结果:分析了奥硝唑的两个主要降解产物的结构。结论:奥硝唑制剂的质量控制应从制剂工艺控制上体现。 相似文献
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Hung Su Kuan-Ting Liu Bai-Hsiun Chen Yen-Ping Lin Yu-Min Jiang Yi-Hong Tsai Fang-Rong Chang Jentaie Shiea Chi-Wei Lee 《Yao wu shi pin fen xi = Journal of food and drug analysis.》2019,27(2):415-427
The unintentional ingestion of toxic compounds in herbs is not uncommon in many parts of the world. To provide timely and life-saving care in the emergency department, it is essential to develop a point-of-care analytical method that can rapidly identify these toxins in herbs. Since electrospray laser desorption ionization mass spectrometry (ELDI/MS) has been successfully used to characterize non-volatile chemical compounds without sample preparation, it was used to identify toxic herbal compounds in this study. The herbal toxins were collected either by sweeping a metallic probe across the surface of a freshly cut herb section or by directly sampling extracts of ground herbal powder. The analytes on the probe were then desorbed, ionized and detected using ELDI/MS, wherein analysis of the herbal toxins was completed within 30 s. This approach allows for the rapid morphological recognition of herbs and early point-of-care identification of herbal toxins for emergency management and is promising in providing important toxicological information to ensure appropriate medical treatment. 相似文献
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目的生长抑素的分子量及其一级结构的测定。方法应用电喷雾质谱法(ESI-MS)测定了环肽药物生长抑素的分子量,用2-巯基乙醇将生长抑素的双硫键还原,再用源内碰撞诱导解离技术进行测定,根据其典型碎片离子确证其氨基酸序列。结果测得生长抑素准分子离子峰[M+H]+ m/z 1 637.8, [M+Na]+ m/z 1 659.5及[M+2Na-H]+ m/z 1 681.5,[M+2H]2+ m/z 819.5及[M+H+Na]2+ m/z 830.3,表明生长抑素的分子量为1 636.7,与理论值一致。将双硫键还原后,用CID技术进行测定,得到了一系列y和b系列的特征碎片离子,证实生长抑素还原产物的氨基酸序列为A-G-C-K-N-F-F-W-K-T-F-T-S-C。结论用ESI-MS法测得的生长抑素的分子量及一级结构与理论值相符。 相似文献
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为了进一步阐明抗癌药与DNA结合的序列选择性和结合本质,用电喷雾质谱方法研究了抗癌药与DNA的相互作用,这些药物包括小沟结合剂(偏端霉素A,DM和纺锤霉素,NP)和嵌入剂(米托蒽醌,MT)。DM与AT富有的DNA主要形成2∶1的特异性复合物,NP只形成1∶1的特异性复合物;MT倾向与GC富有的DNA特异性结合。另外,DM与带5个A/T碱基小沟长度的DNA几乎以2∶1结合,而与带3个A/T碱基的DNA未见结合,而NP与带4个A/T碱基的DNA结合能力最强。MT还与6-mer DNA形成了1∶1特异性复合物。竞争结合实验证明,DM和NP与AT富有的DNA的键合顺序为NP>DM。这些结果为深入研究抗癌药物的作用机制和改进目标药物结构提供了依据。 相似文献
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Sy-Chyi Cheng You-Da Tsai Chi-Wei Lee Bai-Hsiun Chen Jentaie Shiea 《Yao wu shi pin fen xi = Journal of food and drug analysis.》2019,27(2):451-459
Foods and drinks have been adulterated with illicit drugs to facilitate criminal activities. Unfortunately, conventional analytical methods are incapable of rapidly characterizing these drugs in samples, as serious interferences from sample matrices must be removed through tedious and time-consuming pretreatment. Ambient ionization mass spectrometry (AMS) generally does not require sample pretreatment and is thus a suitable tool for directly and rapidly detecting illicit drugs in samples in different physical states. In this study, thermal desorption electrospray ionization mass spectrometry (TD-ESI/MS), an AMS technique, was utilized to efficiently characterize illicit drugs spiked in samples including drinks, powders, and jelly candies. To perform sensitive analysis, the mass analyzer was operated in multiple reaction monitoring mode to monitor the molecular and fragment ions of the target analytes. The time required to complete a typical TD-ESI/MS analysis was less than 30 s. The limits of detection (LODs) for illicit drugs were found to be 100 ppb in drinks, 100–1000 ppb in instant powders, and 1.3–6.5 ng/mm2 on stamp surfaces. FM2 and nitrazepam laced in the inner layer of a jelly candy were detected by TD-ESI/MS, showcasing the advantage of the technique for direct and rapid analysis as opposed to conventional methods. 相似文献