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Annual Review of Analytical Chemistry

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https://www.readbyqxmd.com/read/28605607/analyzing-the-heterogeneous-hierarchy-of-cultural-heritage-materials-analytical-imaging
#1
Karen Trentelman
Objects of cultural heritage significance are created using a wide variety of materials, or mixtures of materials, and often exhibit heterogeneity on multiple length scales. The effective study of these complex constructions thus requires the use of a suite of complementary analytical technologies. Moreover, because of the importance and irreplaceability of most cultural heritage objects, researchers favor analytical techniques that can be employed noninvasively, i.e., without having to remove any material for analysis...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28605606/multianalyte-physiological-microanalytical-devices
#2
Anna Nix Davis, Adam R Travis, Dusty R Miller, David E Cliffel
Advances in scientific instrumentation have allowed experimentalists to evaluate well-known systems in new ways and to gain insight into previously unexplored or poorly understood phenomena. Within the growing field of multianalyte physiometry (MAP), microphysiometers are being developed that are capable of electrochemically measuring changes in the concentration of various metabolites in real time. By simultaneously quantifying multiple analytes, these devices have begun to unravel the complex pathways that govern biological responses to ischemia and oxidative stress while contributing to basic scientific discoveries in bioenergetics and neurology...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28605605/nanosensor-technology-applied-to-living-plant-systems
#3
Seon-Yeong Kwak, Min Hao Wong, Tedrick Thomas Salim Lew, Gili Bisker, Michael A Lee, Amir Kaplan, Juyao Dong, Albert Tianxiang Liu, Volodymyr B Koman, Rosalie Sinclair, Catherine Hamann, Michael S Strano
An understanding of plant biology is essential to solving many long-standing global challenges, including sustainable and secure food production and the generation of renewable fuel sources. Nanosensor platforms, sensors with a characteristic dimension that is nanometer in scale, have emerged as important tools for monitoring plant signaling pathways and metabolism that are nondestructive, minimally invasive, and capable of real-time analysis. This review outlines the recent advances in nanotechnology that enable these platforms, including the measurement of chemical fluxes even at the single-molecule level...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28375705/the-solution-assembly-of-biological-molecules-using-ion-mobility-methods-from-amino-acids-to-amyloid-%C3%AE-protein
#4
Christian Bleiholder, Michael T Bowers
Ion mobility spectrometry-mass spectrometry (IMS-MS) methods are increasingly used to study noncovalent assemblies of peptides and proteins. This review focuses on the noncovalent self-assembly of amino acids and peptides, systems at the heart of the amyloid process that play a central role in a number of devastating diseases. Three different systems are discussed in detail: the 42-residue peptide amyloid-β42 implicated in the etiology of Alzheimer's disease, several amyloid-forming peptides with 6-11 residues, and the assembly of individual amino acids...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28375704/tailored-surfaces-assemblies-for-molecular-plasmonics-and-plasmonic-molecular-electronics
#5
Jean-Christophe Lacroix, Pascal Martin, Pierre-Camille Lacaze
Molecular plasmonics uses and explores molecule-plasmon interactions on metal nanostructures for spectroscopic, nanophotonic, and nanoelectronic devices. This review focuses on tailored surfaces/assemblies for molecular plasmonics and describes active molecular plasmonic devices in which functional molecules and polymers change their structural, electrical, and/or optical properties in response to external stimuli and that can dynamically tune the plasmonic properties. We also explore an emerging research field combining molecular plasmonics and molecular electronics...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28375703/chemical-and-biological-dynamics-using-droplet-based-microfluidics
#6
Oliver J Dressler, Xavier Casadevall I Solvas, Andrew J deMello
Recent years have witnessed an increased use of droplet-based microfluidic techniques in a wide variety of chemical and biological assays. Nevertheless, obtaining dynamic data from these platforms has remained challenging, as this often requires reading the same droplets (possibly thousands of them) multiple times over a wide range of intervals (from milliseconds to hours). In this review, we introduce the elemental techniques for the formation and manipulation of microfluidic droplets, together with the most recent developments in these areas...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28375702/beyond-antibodies-as-binding-partners-the-role-of-antibody-mimetics-in-bioanalysis
#7
Xiaowen Yu, Yu-Ping Yang, Emre Dikici, Sapna K Deo, Sylvia Daunert
The emergence of novel binding proteins or antibody mimetics capable of binding to ligand analytes in a manner analogous to that of the antigen-antibody interaction has spurred increased interest in the biotechnology and bioanalytical communities. The goal is to produce antibody mimetics designed to outperform antibodies with regard to binding affinities, cellular and tumor penetration, large-scale production, and temperature and pH stability. The generation of antibody mimetics with tailored characteristics involves the identification of a naturally occurring protein scaffold as a template that binds to a desired ligand...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28375701/light-addressable-potentiometric-sensors-for-quantitative-spatial-imaging-of-chemical-species
#8
Tatsuo Yoshinobu, Ko-Ichiro Miyamoto, Carl Frederik Werner, Arshak Poghossian, Torsten Wagner, Michael J Schöning
A light-addressable potentiometric sensor (LAPS) is a semiconductor-based chemical sensor, in which a measurement site on the sensing surface is defined by illumination. This light addressability can be applied to visualize the spatial distribution of pH or the concentration of a specific chemical species, with potential applications in the fields of chemistry, materials science, biology, and medicine. In this review, the features of this chemical imaging sensor technology are compared with those of other technologies...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28375700/applications-of-the-new-family-of-coherent-multidimensional-spectroscopies-for-analytical-chemistry
#9
John C Wright
A new family of vibrational and electronic spectroscopies has emerged, comprising the coherent analogs of traditional analytical methods. These methods are also analogs of coherent multidimensional nuclear magnetic resonance (NMR) spectroscopy. This new family is based on creating the same quantum mechanical superposition states called multiple quantum coherences (MQCs). NMR MQCs are mixtures of nuclear spin states that retain their quantum mechanical phase information for milliseconds. The MQCs in this new family are mixtures of vibrational and electronic states that retain their phases for picoseconds or shorter times...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28301754/bioanalytical-measurements-enabled-by-surface-enhanced-raman-scattering-sers-probes
#10
Lauren E Jamieson, Steven M Asiala, Kirsten Gracie, Karen Faulds, Duncan Graham
Since its discovery in 1974, surface-enhanced Raman scattering (SERS) has gained momentum as an important tool in analytical chemistry. SERS is used widely for analysis of biological samples, ranging from in vitro cell culture models, to ex vivo tissue and blood samples, and direct in vivo application. New insights have been gained into biochemistry, with an emphasis on biomolecule detection, from small molecules such as glucose and amino acids to larger biomolecules such as DNA, proteins, and lipids. These measurements have increased our understanding of biological systems, and significantly, they have improved diagnostic capabilities...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28301753/identification-and-quantitation-of-circulating-tumor-cells
#11
Siddarth Rawal, Yu-Ping Yang, Richard Cote, Ashutosh Agarwal
Circulating tumor cells (CTCs) are shed from the primary tumor into the circulatory system and act as seeds that initiate cancer metastasis to distant sites. CTC enumeration has been shown to have a significant prognostic value as a surrogate marker in various cancers. The widespread clinical utility of CTC tests, however, is still limited due to the inherent rarity and heterogeneity of CTCs, which necessitate robust techniques for their efficient enrichment and detection. Significant recent advances have resulted in technologies with the ability to improve yield and purity of CTC enrichment as well as detection sensitivity...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28301752/coded-apertures-in-mass-spectrometry
#12
Jason J Amsden, Michael E Gehm, Zachary E Russell, Evan X Chen, Shane T Di Dona, Scott D Wolter, Ryan M Danell, Gottfried Kibelka, Charles B Parker, Brian R Stoner, David J Brady, Jeffrey T Glass
The use of coded apertures in mass spectrometry can break the trade-off between throughput and resolution that has historically plagued conventional instruments. Despite their very early stage of development, coded apertures have been shown to increase throughput by more than one order of magnitude, with no loss in resolution in a simple 90-degree magnetic sector. This enhanced throughput can increase the signal level with respect to the underlying noise, thereby significantly improving sensitivity to low concentrations of analyte...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28301751/plasmonic-imaging-of-electrochemical-impedance
#13
Liang Yuan, Nongjian Tao, Wei Wang
Electrochemical impedance spectroscopy (EIS) measures the frequency spectrum of an electrochemical interface to resist an alternating current. This method allows label-free and noninvasive studies on interfacial adsorption and molecular interactions and has applications in biosensing and drug screening. Although powerful, traditional EIS lacks spatial resolution or imaging capability, hindering the study of heterogeneous electrochemical processes on electrodes. We have recently developed a plasmonics-based electrochemical impedance technique to image local electrochemical impedance with a submicron spatial resolution and a submillisecond temporal resolution...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28301750/magnetic-resonance-spectroscopy-as-a-tool-for-assessing-macromolecular-structure-and-function-in-living-cells
#14
Conggang Li, Jiajing Zhao, Kai Cheng, Yuwei Ge, Qiong Wu, Yansheng Ye, Guohua Xu, Zeting Zhang, Wenwen Zheng, Xu Zhang, Xin Zhou, Gary Pielak, Maili Liu
Investigating the structure, modification, interaction, and function of biomolecules in their native cellular environment leads to physiologically relevant knowledge about their mechanisms, which will benefit drug discovery and design. In recent years, nuclear and electron magnetic resonance (NMR) spectroscopy has emerged as a useful tool for elucidating the structure and function of biomacromolecules, including proteins, nucleic acids, and carbohydrates in living cells at atomic resolution. In this review, we summarize the progress and future of in-cell NMR as it is applied to proteins, nucleic acids, and carbohydrates...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28301749/sizing-up-protein-ligand-complexes-the-rise-of-structural-mass-spectrometry-approaches-in-the-pharmaceutical-sciences
#15
Joseph D Eschweiler, Richard Kerr, Jessica Rabuck-Gibbons, Brandon T Ruotolo
Capturing the dynamic interplay between proteins and their myriad interaction partners is critically important for advancing our understanding of almost every biochemical process and human disease. The importance of this general area has spawned many measurement methods capable of assaying such protein complexes, and the mass spectrometry-based structural biology methods described in this review form an important part of that analytical arsenal. Here, we survey the basic principles of such measurements, cover recent applications of the technology that have focused on protein-small-molecule complexes, and discuss the bright future awaiting this group of technologies...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28301748/single-molecule-arrays-for-protein-and-nucleic-acid-analysis
#16
Limor Cohen, David R Walt
The last few years have seen breakthroughs that will transform our ability to measure important analytes. Miniaturization of reaction volumes and confinement of analytes of interest into ultrasmall containers have greatly enhanced the sensitivity and throughput of many detection methods. Fabrication of microwell arrays and implementation of bead-based assays have been instrumental in the development of methods for measuring relevant biomolecules, with applications to both diagnostics and fundamental biological studies...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28301747/single-cell-transcriptional-analysis
#17
Angela R Wu, Jianbin Wang, Aaron M Streets, Yanyi Huang
Despite being a relatively recent technological development, single-cell transcriptional analysis through high-throughput sequencing has already been used in hundreds of fruitful studies to make exciting new biological discoveries that would otherwise be challenging or even impossible. Consequently, this has fueled a virtuous cycle of even greater interest in the field and compelled development of further improved technical methodologies and approaches. Thanks to the combined efforts of the research community, including the fields of biochemistry and molecular biology, technology and instrumentation, data science, computational biology, and bioinformatics, the single-cell RNA-sequencing field is advancing at a pace that is both astounding and unprecedented...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28301746/raman-imaging-in-cell-membranes-lipid-rich-organelles-and-lipid-bilayers
#18
Aleem Syed, Emily A Smith
Raman-based optical imaging is a promising analytical tool for noninvasive, label-free chemical imaging of lipid bilayers and cellular membranes. Imaging using spontaneous Raman scattering suffers from a low intensity that hinders its use in some cellular applications. However, developments in coherent Raman imaging, surface-enhanced Raman imaging, and tip-enhanced Raman imaging have enabled video-rate imaging, excellent detection limits, and nanometer spatial resolution, respectively. After a brief introduction to these commonly used Raman imaging techniques for cell membrane studies, this review discusses selected applications of these modalities for chemical imaging of membrane proteins and lipids...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28301745/applications-of-surface-second-harmonic-generation-in-biological-sensing
#19
Renee J Tran, Krystal L Sly, John C Conboy
Surface second harmonic generation (SHG) is a coherent, nonlinear optical technique that is well suited for investigations of biomolecular interactions at interfaces. SHG is surface specific due to the intrinsic symmetry constraints on the nonlinear process, providing a distinct analytical advantage over linear spectroscopic methods, such as fluorescence and UV-Visible absorbance spectroscopies. SHG has the ability to detect low concentrations of analytes, such as proteins, peptides, and small molecules, due to its high sensitivity, and the second harmonic response can be enhanced through the use of target molecules that are resonant with the incident (ω) and/or second harmonic (2ω) frequencies...
June 12, 2017: Annual Review of Analytical Chemistry
https://www.readbyqxmd.com/read/28301728/coupling-front-end-separations-ion-mobility-spectrometry-and-mass-spectrometry-for-enhanced-multidimensional-biological-and-environmental-analyses
#20
Xueyun Zheng, Roza Wojcik, Xing Zhang, Yehia M Ibrahim, Kristin E Burnum-Johnson, Daniel J Orton, Matthew E Monroe, Ronald J Moore, Richard D Smith, Erin S Baker
Ion mobility spectrometry (IMS) is a widely used analytical technique for rapid molecular separations in the gas phase. Though IMS alone is useful, its coupling with mass spectrometry (MS) and front-end separations is extremely beneficial for increasing measurement sensitivity, peak capacity of complex mixtures, and the scope of molecular information available from biological and environmental sample analyses. In fact, multiple disease screening and environmental evaluations have illustrated that the IMS-based multidimensional separations extract information that cannot be acquired with each technique individually...
June 12, 2017: Annual Review of Analytical Chemistry
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