Zeper Abliz

Peking Union Medical College Hospital, Peping, Beijing, China

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Publications (74)230.02 Total impact

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    ABSTRACT: The factor analysis method was applied in analysis of IMS data on the basis of air flow-assisted ionization imaging mass spectrometry. In the experiment, the optical image of sample, IMS images of special m/z and score images of different factors were investigated for the factor analysis. Meanwhile, the ion intensity strengths of certain m/z was used as the color values for IMS images and the scores of certain factor were used as the color values to complete the score images of different factors on different sample points.
    Chinese Journal of Analytical Chemistry. 08/2014; 42(8):1099–1103.
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    ABSTRACT: A water-soluble pillar[10]arene was prepared. Its pH-responsive host–guest complexation with paraquat and application in constructing a supra-amphiphile were investigated.
    Org. Chem. Front. 07/2014; 1(6).
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    ABSTRACT: RATIONALEImpurity analysis plays an important role to guarantee the quality and safety of pharmaceuticals. However, identification of impurities remains challenging, especially for those unknown or at trace levels. We present an integrated approach to detect and characterize the trace impurities in drugs.METHODS Based on liquid chromatography–tandem mass spectrometry (LC–MS/MS), an approach integrating automatic impurity screening method using multiple mass defect filters (MMDFs) and background subtraction (BS) was developed. This approach was used to acquire the structural and semi-quantitative information in a single sample run, and even to discover the impurity signals submerged by background and drug ions. This approach was illustrated by the comprehensive impurity analysis of levofloxacin.RESULTSThis approach was sensitive to detect impurities at the level of 0.02% with respect to levofloxacin concentration. Nineteen impurities were detected, fourteen of which were structurally characterized and eight impurities were reported for the first time. Impurity profiles of levofloxacin drug substances and degradation samples were obtained reliably. A plausible degradation pathway of levofloxacin was proposed including descarboxyl reaction under acid, piperazinyl ring cleavage degradation under light, and N-oxidation under oxidative condition.CONCLUSIONS The generic approach integrating LC–MS/MS and an automatic impurity screening method was developed for the detection, characterization and monitoring of impurities, especially those unknown or at trace levels. This approach was demonstrated to be rapid, sensitive and automatic for impurity profiling of drugs. Copyright © 2014 John Wiley & Sons, Ltd.
    Rapid Communications in Mass Spectrometry 05/2014; 28(10). · 2.51 Impact Factor
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    ABSTRACT: In this article, we present the design and construction of a series of supramolecular poly(benzyl ether) metallodendrimers featuring a well-defined hexagonal metallacycle at their cores via coordination-driven self-assembly. It was found that the second generation metallodendrimer 3c was able to hierarchically self-assemble into the regular vesicle-like structures. These nano-scale vesicles were monodisperse in shape and relatively monodisperse in size as detected in SEM, TEM, AFM, and DLS experiments. Notably, this kind of hierarchically formed vesicle-like nano-structures adopted a discrete metallacycle as the main skeleton, which is obviously different from many previous reports of nano-scale spherical architectures. Moreover, such supramolecular vesicle-like structures could encapsulate some fluorescent molecules like BODIPY and SRB, etc. By taking advantage of the dynamic nature of metal-ligand bonds, the disassembly and reassembly of the hexagonal cavity core could be reversibly controlled by the addition and removal of bromide ions, resulting in the transition from the vesicles to micelles. Thus, the controlled release of fluorescence dye was successfully realized by the halide-induced vesicles-micelles transition. These findings not only enrich the library of supramolecular metallodenrimers but also provide a new avenue to the construction of novel "smart" nano-materials, which have potential application in functional molecules delivery and release.
    Journal of the American Chemical Society 03/2014; · 10.68 Impact Factor
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    ABSTRACT: By the introduction of 14 anionic carboxylate groups at its two rims, a water-soluble pillar[7]arene (WP7) was synthesized. Its pH-controlled complexation with paraquat G1 in water was investigated. Host WP7 and guest G1 formed a 1:1 [2]pseudorotaxane with a high association constant of (2.96 ± 0.31) × 10(9) M(-1) in water. Furthermore, we took advantage of this novel molecular recognition motif to fabricate a supra-amphiphile based on WP7 and an amphiphilic paraquat derivative G2. The morphologies and sizes of self-assemblies of G2 and WP7⊃G2 were identified by transmission electron microscopy and dynamic light scattering.
    Organic Letters 03/2014; · 6.14 Impact Factor
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    ABSTRACT: A water-soluble pillar[9]arene was synthesized. Its pH-responsive host-guest binding to paraquat in water was studied.
    Chemical Communications 02/2014; · 6.38 Impact Factor
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    ABSTRACT: It was the original data to be analyzed by the multivariate statistical strategy. The (X,Y) was the length and the width of the sample. A subset of the datacube was a dataset which had same X or Y.
    Chinese Chemical Letters 01/2014; · 1.18 Impact Factor
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    ABSTRACT: The imaging mass spectrometry (IMS) technology has experienced a rapid development in recent years. A new IMS technology which is based on air flow assisted ionization (AFAI) was reported. It allows for the convenient pretreatment of the samples and can image a large area of sample in a single measurement with high sensitivity. The AFAI in DESI mode was used as the ion source in this paper. The new IMS method is named AFADESI-IMS. The adoption of assisted air flow makes the sample pretreatment easy and convenient. An optimization of the distance between the ion transport tube and MS orifice increases the sensitivity of the system. For data processing, a program based on MATLAB with the function of numerical analysis was developed. A theoretical imaging resolution of a few hundred microns can be achieved. The composite AFAI-IMS images of different target analytes were imaged with high sensitivity. A typical AFAI-IMS image of the whole-body section of a rat was obtained in a single analytical measurement. The ability to image a large area for relavent samples in a single measurement with high sensitivity and repeatability is a significant advantage. The method has enormous potentials in the MS imaging of large and complicated samples.
    Chinese Chemical Letters 01/2014; · 1.18 Impact Factor
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    ABSTRACT: To screen the harmful substance 5-hydroxymethyl furfural content in commercially available traditional Chinese medicine injection which are commonly used, and to preliminarily evaluate the quality of these injections, 5-hydroxymethyl furfural was taken as an index. The contents of 5-hydroxymethyl furfural in 56 samples which consist of 23 kinds of traditional Chinese medicine injections and glucose injection were determined using LC-MS/MS, and 5-hydroxymethyl furfural was detected in 52 of these samples. The minimal content was 0.0038 microg x L(-1) and the maximum content was 1420 microg x mL(-1). The contents of 5-hydroxymethyl furfural were significantly different in traditional Chinese medicine injection which came from different kinds, manufacturers or batches. The results showed the quality difference of commercially available traditional Chinese medicine injection is significant taking 5-hydroxymethyl furfural content as assessment index. More attention should be paid to the safety of 5-hydroxymethyl furfural in traditional Chinese medicine injection, and unified limitation standard should be set to improve medication safety of traditional Chinese medicine injection.
    Yao xue xue bao = Acta pharmaceutica Sinica 11/2013; 48(11):1705-9.
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    ABSTRACT: Acquiring global information on plasma-endogenous metabolites challenges metabolomics. This study has been designed to investigate the suitability of integrated ionization rapid-resolution liquid chromatography/tandem mass spectrometry (RRLC/MS/MS) for different kinds of metabolites in complex plasma, and provides an approach for plasma metabolomics in acquiring more comprehensive data of metabolites. Integrated ionization of electrospray ionization (ESI), atmospheric pressure chemical ionization (APCI), and atmospheric pressure photoionization (APPI) combined with RRLC/MS/MS has been carried out to perform analysis on the global plasma metabolome of healthy volunteers. The contributions to the total numbers of ion features by RRLC/MS with ESI, APCI, and APPI in positive and negative ion modes were calculated. Representative unique and identical ions were identified. The intensities of identical ions were compared. Each of ESI, APCI, and APPI coupled with RRLC/MS has its own advantage over the other two techniques for certain types of metabolites in plasma. LC/ESI-MS is very sensitive for detecting glycerophosphocholines, glycerophosphoethanolamines, acyl carnitines, bile acids, sulfate, etc. LC/APCI-MS is suitable for analyzing cyclic alcohols, fatty acids, and linoleic acids. LC/APPI-MS proves to be appropriate in detecting steroids, sphingolipids, some amino acids, nucleosides, and purines in plasma. It is suggested that the integrated ionization LC/MS approach should be applied for global plasma metabolomics. Moreover, the results obtained demonstrate that it is preferable to choose certain techniques from LC/ESI-MS, LC/APCI-MS, and LC/APPI-MS for metabolite target analysis. Copyright © 2013 John Wiley & Sons, Ltd.
    Rapid Communications in Mass Spectrometry 09/2013; 27(18):2071-80. · 2.51 Impact Factor
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    ABSTRACT: A new family of 120° polysulfurated dipyridine donors have been successfully designed and synthesized, from which a series of novel rhomboidal and hexagonal supramolecular polysulfurated metallodendrimers were prepared via coordination-driven self-assembly. The structures of the newly designed polysulfurated metallodendrimers were characterized by multinuclear NMR (1H and 31P), mass spectrometry (CSI-TOF-MS), and elemental analysis. Moreover, the shape and size of these novel metallodendrimers were investigated with PM6 semi-empirical molecular orbital methods.
    Tetrahedron. 07/2013; 69(29):5981–5988.
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    ABSTRACT: It is essential to choose one pre-processing method for liquid chromatographymass spectrometry (LC-MS)-based metabolomics studies of urine samples in order to overcome their variability. However, the commonly used normalization methods do not substantially reduce the high variabilities arising from differences in urine concentration, especially for signal saturation (abundant metabolites exceed the dynamic range of the instrumentation), or missing values. Herein, a simple pre-acquisition strategy based on differential injection volumes calibrated by creatinine (to reduce the concentration differences between the samples), combined with normalization to "total useful MS signals" or "all MS signals", is proposed to overcome urine variabilities. This strategy was first systematically compared with other popular normalization methods by application to serially diluted urine samples. Then the method has been verified using rat urine samples of pre- and post-inoculation of Walker 256 carcinoma cells. The results showed that the calibration of injection volumes based on creatinine values could effectively eliminate intra-group differences caused by variations in the concentrations of urinary metabolites, thus giving better parallelism and clustering effects. In addition, peak area normalization could further eliminate intra-class differences. Therefore, the strategy of combining peak area normalization with calibration of injection volumes of urine samples based on their creatinine values is effective for solving problems associated with urinary metabolomics.
    Analytical Chemistry 07/2013; · 5.70 Impact Factor
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    ABSTRACT: The design and self-assembly of pyrene-modified rhomboidal metallodendrimers R1–R6 via directional metal-ligand bonding approach is described. By employing pyrene-containing 120° di-Pt(II) acceptor and appropriate 60° dendritic dipyridyl donors, a variety of [G-1]–[G-3] pyrene-modified rhomboidal metallodendrimers with well-defined shape and size were prepared under mild conditions in high yields. The supramolecular dendrimers were characterized with multinuclear NMR (1H and 31P) and mass spectrometry (CSI-TOF-MS). Isotopically resolved mass spectrometry data support the existence of the pyrene-modified dendrimers with rhomboidal cavities, and NMR data were consistent with the formation of all ensembles. The shape and size of all rhomboidal dendrimers were investigated with the PM6 semiempirical molecular orbital method. Their primary photochemical properties were studied as well.
    Chinese Journal of Chemistry 05/2013; 31(5). · 0.92 Impact Factor
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    ABSTRACT: A metabolomics strategy based on rapid resolution liquid chromatography/tandem mass spectrometry (RRLC-MS/MS) and multivariate statistics has been implemented to identify potential biomarkers in uterine cervix cancer. Due to the importance of the data pre-processing method, three popular software packages have been compared. Then they have been used to acquire respective data matrices from the same LC-MS/MS data. Multivariate statistics was subsequently used to identify significantly changed biomarkers for uterine cervix cancer from the resulting data matrices. The reliabilities of the identified discriminated metabolites have been further validated on the basis of manually extracted data and ROC curves. Nine potential biomarkers have been identified as having a close relationship with uterine cervix cancer. Considering these in combination as a biomarker group, the AUC amounted to 0.997, with a sensitivity of 92.9% and a specificity of 95.6%. The prediction accuracy was 96.6%. Among these potential biomarkers, the amounts of four purine derivatives were greatly decreased, which might be related to a P2 receptor that might lead to a decrease in cell number through apoptosis. Moreover, only two of them were identified simultaneously by all of the pre-processing tools. The results have demonstrated that the data pre-processing method could seriously bias the metabolomics results. Therefore, application of two or more data pre-processing methods would reveal a more comprehensive set of potential biomarkers in non-targeted metabolomics, before a further validation with LC-MS/MS based targeted metabolomics in MRM mode could be conducted.
    The Analyst 03/2013; · 4.23 Impact Factor
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    ABSTRACT: Diagnostic and therapeutic biomarkers useful for esophageal squamous cell carcinoma (ESCC) have the ability to increase the long term survival of cancer patients. A metabolomics study, using plasma from four groups including ESCC patients before, during and after chemoradiotherapy (CRT) and healthy controls, was originally carried out by LC-MS to determine global alterations in the metabolic profiles and find biomarkers potentially applicable to diagnosis and monitoring treatment effects. It is worth pointing out that a clear clustering and separation of metabolic data from the four groups was observed, which indicated that disease status and treatment intervention resulted in specific metabolic perturbations in the patients. A series of metabolites were found to be significantly altered in ESCC patients vs. healthy controls and in pre- vs. post-treatment patients based on multivariate statistical data analysis (MVDA). In order to further validate the reliability of these potential biomarkers, an independent validation was performed by using the multiple reaction monitoring (MRM) based targeted approach. Finally, 18 most significantly altered plasma metabolites in ESCC patients, relative to healthy controls, were tentatively identified as lysophosphatidylcholines (lysoPCs), fatty acids, L-carnitine, acylcarnitines, organic acids and a sterol metabolite. The classification performance of these metabolites were analysed by receiver operating characteristic (ROC) analysis and a biomarker panel was generated. Together, biological significance of these metabolites was discussed. Comparison between pre- and post-treatment patients generated 11 metabolites as potential therapeutic biomarkers which were tentatively identified as amino acids, acylcarnitines and lysoPCs. Levels of three of these (ToctanoylcarnitineT, TlysoPC(16:1), and decanoylcarnitine)T were closely correlated with treatment effect. Moreover, variation of these three potential biomarkers was investigated over the treatment course. The results suggest that these biomarkers may be useful in diagnosis, as well as in monitoring therapeutic responses and predicting outcomes of the ESCC.
    Molecular &amp Cellular Proteomics 02/2013; · 7.25 Impact Factor
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    ABSTRACT: Metabonomics is an important platform for investigating the metabolites of integrated living systems and their dynamic responses to changes caused by both endogenous and exogenous factors. A metabonomics strategy based on LC-MS/MS in both positive and negative ion modes was applied to investigate the short-term and long-term stability of metabolites in plasma. Principal components analysis (PCA) and ten kinds of identified metabolites were used to summarize the time-dependent change rules in metabolites systematically at different temperatures. The long-term stability of metabolites in plasma specimens stored at -80 °C for five years was also studied. Analysis of these subjects identified 36 metabolites with statistically significant changes in expression (p<0.05) and found a kind of metabolites with hundred-fold change. The stability of metabolites in blood at 4 °C for 24 h was also investigated. These studies show that a thorough understanding of the effects of metabolite stability are necessary for improving the reliability of potential biomarkers.
    Analytical Chemistry 02/2013; · 5.70 Impact Factor
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    ABSTRACT: Whole-body molecular imaging is able to directly map spatial distribution of molecules and monitor its biotransformation in intact biological tissue sections. Imaging mass spectrometry (IMS), a label-free molecular imaging method, can be used to image multiple molecules in a single measurement with high specificity. Herein, a novel easy-to-implement, whole-body IMS method was developed with air flow-assisted ionization in a DESI mode (AFA-DESI). The developed IMS method can effectively image molecules in a large whole-body section in open air without sample pretreatment, such as chemical labeling, section division or matrix deposition. Moreover, the signal levels were improved and the spatial assignment errors were eliminated, thus high-quality whole-body images were obtained. With this novel IMS method, in situ mapping analysis of molecules was performed in adult rat sections with picomolar sensitivity under ambient conditions, and the dynamic information of molecule distribution and its biotransformation was provided to uncover molecular events at the whole-animal level. A global view of the differential distribution of an anticancer agent and its metabolites was simultaneously acquired in whole-body rat and model mouse bearing neuroglioma along the administration time. The obtained drug distribution provided rich information for identifying the targeted organs, and predicting possible tumor spectrum, pharmacological activity and potential toxicity of drug candidates.
    Analytical Chemistry 02/2013; · 5.70 Impact Factor
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    ABSTRACT: An integrated approach combining data acquisition using MS(E) and multi-period product ion scan (mpMS/MS), with high-resolution characteristic extracted ion chromatograms (hcXIC) as a data mining method, was developed for in vivo drug metabolites screening and identification. This approach is illustrated by analyzing metabolites of a potential anticancer agent, 3,6,7-trimethoxyphenanthroindolizidine (CAT) in rat urine based on rapid resolution liquid chromatography combined with tandem mass spectrometry (RRLC-MS/MS). Untargeted full-scan MS(E) enabled the high-throughput acquisition of potential metabolites, and targeted mpMS/MS contributed to the sensitivity and specificity of the acquisition of molecules of interest. The data processing method hcXIC, based on the structure of CAT, was shown to be highly effective for the metabolite discovery. Through the double-filtering effect of the characteristic ion and accurate mass, conventional extracted ion chromatograms that contained a substantial number of false-positive peaks were simplified into chromatograms essentially free of endogenous interferences. As a result, 21 metabolites were detected in rat urine after oral administration of CAT. Based on the characteristic fragmentation patterns of the phenanthroindolizidine alkaloid, the structures of 9 metabolites were identified. Furthermore, the interpretation of the MS/MS spectra of these metabolites enabled the determination of demethylation position as well as the differentiation between N-oxidized and hydroxylated metabolites.
    Analytica chimica acta 06/2012; 731:60-7. · 4.31 Impact Factor
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    ABSTRACT: A new water-soluble pillar[5]arene containing ten imidazolium groups was prepared. It can be used as a stabilizer to fabricate gold nanoparticles smaller than 6 nm in water.
    Chemical Communications 05/2012; 48(52):6505-7. · 6.38 Impact Factor
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    ABSTRACT: A new family of 60° dendritic di-Pt(II) acceptor tectons have been successfully designed and synthesized, from which a series of novel "three-component" triangular metallodendrimers were prepared via [3 + 3] coordination-driven self-assembly. The structures of newly designed triangular metallodendrimers are characterized by multinuclear NMR ((1)H and (31)P), (1)H DOSY NMR, mass spectrometry (CSI-TOF-MS), and elemental analysis. The shape and size of all supramolecular dendritic triangles were investigated with PM6 semiempirical molecular orbital methods.
    The Journal of Organic Chemistry 03/2012; 77(7):3426-32. · 4.56 Impact Factor

Publication Stats

372 Citations
230.02 Total Impact Points

Institutions

  • 2002–2013
    • Peking Union Medical College Hospital
      Peping, Beijing, China
  • 2011–2012
    • East China Normal University
      • Department of Chemistry
      Shanghai, Shanghai Shi, China
  • 2009–2012
    • Zhejiang University
      • Department of Chemistry
      Hangzhou, Zhejiang Sheng, China
  • 2008
    • Lawrence Berkeley National Laboratory
      • Molecular Foundry
      Berkeley, CA, United States
  • 2003
    • Chinese Academy of Medical Sciences
      Peping, Beijing, China