Small Molecule Matrix-free Laser Desorption/ionization Mass Spectrometry PDF Download

Author:
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Category :
Languages : en
Pages : 186

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Modified Si wafers and nanoparticles (5-50 nm) have been developed and explored to assist laser desorption ionization mass spectrometry (LDI-MS) for small molecule analysis. DIOS (desorption/ionization on silicon) plates were prepared according to published protocols. DIOS was tested and compared with the optimized silicon nanoparticles derivatized by penterfluorophenylchlorosilane (PFP). SPALDI (Si nanoparticle assisted LDI) requires less laser flux than common MALDI and DIOS thus provides significant less background and higher ionization efficiency. It has higher surface homogeneity, relative salt tolerance and high selectivity which may origin from analyte dependent pre-charging. Surface characterization has been investigated. And different analytes including drugs, peptides, pesticides and acids in both biological and environmental samples have been applied by positive or negative ionization mode. Detection limits, down to the low femtomole per microliter levels have been achieved for propafenone and verapamil. SPALDI is an easily applicable practical tool at a potential low cost.

Author: Suzanne Lorraine Frison
Publisher:
ISBN:
Category : Food
Languages : en
Pages : 226

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Author:
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ISBN:
Category :
Languages : en
Pages : 201

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Matrix-assisted laser desorption/ionization(MALDI) mass spectrometry(MS) has been widely used for analysis of biological molecules, especially macromolecules such as proteins. However, MALDI MS has a problem in small molecule (less than 1 kDa) analysis because of the signal saturation by organic matrixes in the low mass region. In imaging MS (IMS), inhomogeneous surface formation due to the co-crystallization process by organic MALDI matrixes limits the spatial resolution of the mass spectral image. Therefore, to make laser desorption/ionization (LDI) MS more suitable for mass spectral profiling and imaging of small molecules directly from raw biological tissues, LDI MS protocols with various alternative assisting materials were developed and applied to many biological systems of interest. Colloidal graphite was used as a matrix for IMS of small molecules for the first time and methodologies for analyses of small metabolites in rat brain tissues, fruits, and plant tissues were developed. With rat brain tissues, the signal enhancement for cerebroside species by colloidal graphite was observed and images of cerebrosides were successfully generated by IMS. In addition, separation of isobaric lipid ions was performed by imaging tandem MS. Directly from Arabidopsis flowers, flavonoids were successfully profiled and heterogeneous distribution of flavonoids in petals was observed for the first time by graphite-assisted LDI(GALDI) IMS.

Author: Lin He
Publisher: Humana Press
ISBN: 9781493913565
Category : Medical
Languages : en
Pages : 0

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Mass Spectroscopy Imaging (MSI) has emerged as an enabling technique to provide insight into the molecular entities within cells, tissues and whole-body samples and to understand inherent complexities within biological metabolomes. In Mass Spectrometry Imaging of Small Molecules: Methods and Protocols, experts in the MSI field present techniques for 2D and 3D visualization and quantification of a wide array of small molecular species present in biologically relevant samples. Chapters provide detailed operational instructions from sample preparation to method selection, from comparative quantification to structural identification and from data collection to visualization of small molecule mapping in complex samples. Written in the successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible protocols and notes on troubleshooting and avoiding known pitfalls. Authoritative and easily accessible, Mass Spectrometry Imaging of Small Molecules: Methods and Protocols aims to bring the rapidly maturing methods of metabolic imaging to life science researchers and to minimize technical intimidation in adapting new technological platforms in biological research.

Author: Ralf Zimmermann
Publisher: John Wiley & Sons
ISBN: 3527335102
Category : Science
Languages : en
Pages : 448

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Provides comprehensive coverage of laser-induced ionization processes for mass spectrometry analysis Drawing on the expertise of the leading academic and industrial research groups involved in the development of photoionization methods for mass spectrometry, this reference for analytical scientists covers both the theory and current applications of photo-induced ionization processes. It places widely used techniques such as MALDI side by side with more specialist approaches such as REMPI and RIMS, and discusses leading edge developments in ultrashort laser pulse desorption, to give readers a complete picture of the state of the technology. Photoionization and Photo-Induced Processes in Mass Spectrometry: Fundamentals and Applications starts with a complete overview of the fundamentals of the technique, covering the basics of the gas phase ionization as well as those of laser desorption and ablation, pulse photoionization, and single particle ionization. Numerous application examples from different analytical fields are described that showcase the power and the wide scope of photo ionization in mass spectrometry. -The first general reference book on photoionization techniques for mass spectrometry -Examines technologies and applications of gas phase resonance-enhanced multiphoton ionization mass spectrometry (REMPI-MS) and gas phase resonance ionization mass spectrometry (RIMS) -Provides complete coverage of popular techniques like MALDI -Discusses the current and potential applications of each technology, focusing on process and environmental analysis Photoionization and Photo-Induced Processes in Mass Spectrometry: Fundamentals and Applications is an excellent book for spectroscopists, analytical chemists, photochemists, physical chemists, and laser specialists.

Author: Frieder Mugele
Publisher: John Wiley & Sons
ISBN: 3527412298
Category : Science
Languages : en
Pages : 323

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Starting from the basic principles of wetting, electrowetting and fluid dynamics all the way up to those engineering aspects relevant for the development of specific devices, this is a comprehensive introduction and overview of the theoretical and practical aspects. Written by two of the most knowledgeable experts in the field, the text covers both current as well as possible future applications, providing basic working principles of lab-on-a-chip devices and such optofluidic devices as adaptive lenses and optical switches. Furthermore, novel e-paper display technology, energy harvesting and supercapacitors as well as electrowetting in the nano-world are discussed. Finally, the book contains a series of exercises and questions for use in courses on microfluidics or electrowetting. With its all-encompassing scope, this book will equally serve the growing community of students and academic and industrial researchers as both an introduction and a standard reference.

Author: Miguel de la Guardia
Publisher: John Wiley & Sons
ISBN: 1119422612
Category : Science
Languages : en
Pages : 931

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A comprehensive guide to smart materials and how they are used in sample preparation, analytical processes, and applications This comprehensive, two-volume handbook provides detailed information on the present state of new materials tailored for selective sample preparation and the legal frame and environmental side effects of the use of smart materials for sample preparation in analytical chemistry, as well as their use in the analytical processes and applications. It covers both methodological and applied analytical aspects, relating to the development and application of new materials for solid-phase extraction (SPE) and solid-phase microextraction (SPME), their use in the different steps and techniques of the analytical process, and their application in specific fields such as water, food, air, pharmaceuticals, clinical sciences and forensics. Every chapter in Handbook of Smart Materials in Analytical Chemistry is written by experts in the field to provide a comprehensive picture of the present state of this key area of analytical sciences and to summarize current applications and research literature in a critical way. Volume 1 covers New Materials for Sample Preparation and Analysis. Volume 2 handles Analytical Processes and Applications. Focuses on the development and applications of smart materials in analytical chemistry Covers both, methodological and applied analytical aspects, for the development of new materials and their use in the different steps and techniques of the analytical process and their application in specific fields Features applications in key areas including water, air, environment, pharma, food, forensic, and clinical Presents the available tools for the use of new materials suitable to aid recognition process to the sample preparation and analysis A key resource for analytical chemists, applied laboratories, and instrument companies Handbook of Smart Materials in Analytical Chemistry, 2V Set is an excellent reference book for specialists and advanced students in the areas of analytical chemistry, including both research and application environments.

Author: Hui Zhang
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: Franz Hillenkamp
Publisher: John Wiley & Sons
ISBN: 3527333312
Category : Science
Languages : en
Pages : 0

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This authoritative book on MALDI MS, now finally available in its second edition and edited by one of its inventors, gives an in-depth description of the many different applications, along with a detailed discussion of the technology itself. Thoroughly updated and expanded, with contributions from key players in the field, this unique book provides a comprehensive overview of MALDI MS along with its possibilities and limitations. The initial chapters deal with the technology and the instrumental setup, followed by chapters on the use of MALDI MS in protein research (including proteomics), genomics, glycomics and lipidomics. The option of MALDI-MS for the analysis of polymers and small molecules are also covered in separate chapters, while new to this edition is a section devoted to the interplay of MALDI MS and bioinformatics. A much-needed practical and educational asset for individuals, academic institutions and companies in the field of bioanalytics.

Author: Timothy J. Garrett
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Eleven individual phosphatidylcholines and sphingomyelins were identified by MS2 with fragment ions that allow for the identification of the fatty acyl chains and their position on the glycerol backbone. The use of non-conductive and conductive glass microscope slides in connection to ion trap mass analysis was evaluated, and results showed that equivalent data could be obtained on either surface. An artistic airbrush was employed to effectively coat the matrix compound onto tissue sections without the deleterious effects of analyte migration.