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Anja Hartmann Kathrin Becker Ulf Karsten Daniel Remias Markus Ganzera 《Marine drugs》2015,13(10):6291-6305
Mycosporine-like amino acids (MAAs), a group of small secondary metabolites found in algae, cyanobacteria, lichens and fungi, have become ecologically and pharmacologically relevant because of their pronounced UV-absorbing and photo-protective potential. Their analytical characterization is generally achieved by reversed phase HPLC and the compounds are often quantified based on molar extinction coefficients. As an alternative approach, in our study a fully validated hydrophilic interaction liquid chromatography (HILIC) method is presented. It enables the precise quantification of several analytes with adequate retention times in a single run, and can be coupled directly to MS. Excellent linear correlation coefficients (R2 > 0.9991) were obtained, with limit of detection (LOD) values ranging from 0.16 to 0.43 µg/mL. Furthermore, the assay was found to be accurate (recovery rates from 89.8% to 104.1%) and precise (intra-day precision: 5.6%, inter-day precision ≤6.6%). Several algae were assayed for their content of known MAAs like porphyra-334, shinorine, and palythine. Liquid chromatography-mass spectrometry (LC-MS) data indicated a novel compound in some of them, which could be isolated from the marine species Catenella repens and structurally elucidated by nuclear magnetic resonance spectroscopy (NMR) as (E)-3-hydroxy-2-((5-hydroxy-5-(hydroxymethyl)-2-methoxy-3-((2-sulfoethyl)amino)cyclohex-2-en-1-ylidene)amino) propanoic acid, a novel MAA called catenelline. 相似文献
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试验采用氨基柱(150 mm×4.6 mm,5μm粒径,10nm孔径),流动相A:CH3CN;流动相B:5 mM乙酸铵水溶液;梯度:0～5 min(5%～30%B),50～60 min(30%B);检测波长:270 nm;流速:1.0 mL/min。旨在亲水作用色谱模式下,建立测定红花注射液中腺苷含量的方法。结果表明:腺苷浓度在2.5～20μg/mL范围内,线性关系良好,平均回收率为98.56%,RSD为3.17%(n=9)。该方法简便、快速、准确,结果可靠。 相似文献
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The aim of this study was to develop an analytical procedure based on liquid chromatography-mass spectrometry (LC–MS) for analysis of monomeric organic N compounds in soil extracts. To benchmark the developed LC–MS method it was compared with a capillary electrophoresis–mass spectrometry (CE–MS) method recently used for analysis of small organic N monomers in soil. The separation was optimized and analytical performance assessed with 69 purified standards, then the LC–MS method was used to analyse soil extracts. Sixty-two out of 69 standards were analysable by LC–MS with separation on a hydrophilic interaction liquid chromatography column. The seven compounds that could not be analysed were strongly cationic polyamines. Limits of detection for a 5 μL injection ranged between 0.002 and 0.38 μmol L−1, with the majority (49 out of 62) having limits of detection better than 0.05 μmol L−1. The overall profile and concentration of small organic N monomers in soil extracts was broadly similar between LC–MS and CE–MS, with the notable exception of four ureides that were detected by LC–MS only. In soil extracts that had been concentrated ten-fold the detection and quantification of (some) organic N compounds was compromised by the presence of large amounts of inorganic salts. The developed LC–MS method offered advantages and disadvantages relative to CE–MS, and a combination of the two methods would achieve the broadest possible coverage of organic N in soil extracts. 相似文献
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分散固相萃取结合亲水作用色谱-串联质谱法检测预混合饲料中7种抗病毒药物含量 总被引：2，自引：2，他引：0
建立了同时检测预混合饲料中7种抗病毒药物含量的分散固相萃取(Qu CHERS)结合亲水作用色谱(HILIC)-串联质谱检测方法,包括了金刚烷胺、吗啉胍、金刚乙胺、阿昔洛韦、利巴韦林、更昔洛韦和奥司他韦。选择使用乙腈提取,无水Mg SO_4进行脱水和盐析,C18粉和丙基乙二胺(Primary secondary amine,PSA)进行样品净化。使用亲水作用液相色谱柱进行分离,流动相为0.2%甲酸和乙腈,采用梯度洗脱,三重四级杆质谱进行定性定量分析。实验结果表明,方法的最低检出限为25μg/kg,最低定量限为50μg/kg,在50~5000μg/kg范围内线性关系良好(r0.995),添加回收率在60%~110%之间,RSD10%,表明该方法具有较好的准确度与精密度。 相似文献
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基于液相色谱-串联质谱法(liquid chromatography-tandem mass spectrometry,LC-MS/MS),比较了两种亲水交互作用(hydrophilic liquid interaction chromatography column,HILIC)色谱柱和C18色谱柱分析扁玉螺(Nev... 相似文献
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Elisabeth J. Faassen Maria G. Antoniou Wendy Beekman-Lukassen Lucie Blahova Ekaterina Chernova Christophoros Christophoridis Audrey Combes Christine Edwards Jutta Fastner Joop Harmsen Anastasia Hiskia Leopold L. Ilag Triantafyllos Kaloudis Srdjan Lopicic Miquel Lürling Hanna Mazur-Marzec Jussi Meriluoto Cristina Porojan Yehudit Viner-Mozzini Nadezda Zguna 《Marine drugs》2016,14(3)
Exposure to β-N-methylamino-l-alanine (BMAA) might be linked to the incidence of amyotrophic lateral sclerosis, Alzheimer’s disease and Parkinson’s disease. Analytical chemistry plays a crucial role in determining human BMAA exposure and the associated health risk, but the performance of various analytical methods currently employed is rarely compared. A CYANOCOST initiated workshop was organized aimed at training scientists in BMAA analysis, creating mutual understanding and paving the way towards interlaboratory comparison exercises. During this workshop, we tested different methods (extraction followed by derivatization and liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) analysis, or directly followed by LC-MS/MS analysis) for trueness and intermediate precision. We adapted three workup methods for the underivatized analysis of animal, brain and cyanobacterial samples. Based on recovery of the internal standard D3BMAA, the underivatized methods were accurate (mean recovery 80%) and precise (mean relative standard deviation 10%), except for the cyanobacterium Leptolyngbya. However, total BMAA concentrations in the positive controls (cycad seeds) showed higher variation (relative standard deviation 21%–32%), implying that D3BMAA was not a good indicator for the release of BMAA from bound forms. Significant losses occurred during workup for the derivatized method, resulting in low recovery (<10%). Most BMAA was found in a trichloroacetic acid soluble, bound form and we recommend including this fraction during analysis. 相似文献
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GC-MS based metabolomics of genetically modified rice varieties are widely reported but involves tedious derivatization processes. Broad-scale LC-MS-based metabolomics are lacking or limited to targeted analyses. In this study, metabolite diversity in natural rice variants including basmati and non-basmati rice varieties was investigated using polymeric hydrophilic interaction chromatography coupled to an Orbitrap mass analyzer. Identification was performed using exact mass and standard retention times. A total of 329 metabolites were selected using IDEOM (Identification of metabolites) software. Statistical tests were used to filter out top 50 rice varieties discriminating metabolites. Several up- or down-regulated metabolites were observed in rice varieties and can be used as biomarker compounds to differentiate between rice varieties. The developed method and generated data can be used for the comparison of genetically modified rice varieties with natural ones, an important requirement for the implementation of comparator-based GMO risk assessment procedures demanded by national and international regulations. 相似文献
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建立了超高效液相色谱结合亲水相互作用色谱法测定普鲁卡因青霉素注射液中的主成分含量的方法。精密量取1.00 mL样品悬浊液置分液漏斗中,加入石油醚和甲醇震摇提取。静置分层后将下层提取液取出置容量瓶中以甲醇定容至刻度。提取液经稀释至适当浓度后过0.22μm滤膜,上机测定。目标物使用超高效液相色谱等度洗脱分离。以亲水相互作用色谱柱为固定相,以0.05 mol/L甲酸铵溶液(pH=4.00)∶乙腈=10∶90为流动相。紫外二级管阵列检测器检测235 nm波长处吸收进行定量分析。实验结果表明,该方法在青霉素含量40~800 mg/mL,普鲁卡因含量50~1000 mg/mL内线性关系良好(r>0.999),其添加回收率在92%~105%,RSD<3%,表明该方法具有较好的准确度与精密度。通过与《中国兽药典2015版一部》普鲁卡因青霉素注射液含量测定项下方法所测得结果的比较,两者RSD<3%,表明结果一致。 相似文献
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