Analytical Chemistry News

COLORIMETRIC DETECTION OF HYPOCHLORITE BASED ON THE MORPHOLOGICAL CHANGES OF SILVER NANOPRISMS TO SPHERICAL NANOPARTICLES

RSC - Anal. Methods latest articles - Mon, 04/24/2017 - 10:51
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00716G, PaperSASIKUMAR THANGARASU, Ilanchelian Malaichamy
In this work, we have developed a simple, rapid, sensitive and selective colorimetric method for the quantitative determination of hypochlorite (ClO-) ion by using triangular silver nanoprisms (AgNPRs) as a...
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Rapid simultaneous determination of 22 constituents in Menispermi Rhizoma by ultra-performance liquid chromatography tandem triple quadrupole mass spectrometry

RSC - Anal. Methods latest articles - Mon, 04/24/2017 - 10:51
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00559H, PaperJinxia Wei, Kunna Cui, Yueying Du, Jia Yu, Zhen Jiang, Xingjie Guo
A multi-component-assay quality control method, using ultra-performance liquid chromatography coupled with electrospray ionization tandem mass spectrometry, has been developed for the simultaneous quantification of 22 constituents in Menispermi Rhizoma. By...
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Boosting extreme learning machine for near-infrared spectral quantitative analysis of diesel fuel and edible blend oil samples

RSC - Anal. Methods latest articles - Mon, 04/24/2017 - 10:51
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00353F, PaperXihui Bian, Caixia Zhang, Xiao-Yao Tan, Michal Dymek, Yugao Guo, Ligang Lin, Bowen Cheng, Xiaoyu Hu
Extreme learning machine (ELM) has drawn increasing attention due to its characteristics of simple structure, high learning speed and excellent performance. However, a single ELM tends to low predictive accuracy...
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Quantification of Intractable Membrane Proteins in Genetically Engineered Crops by Liquid Chromatography Coupled with Tandem Mass Spectrometry

RSC - Anal. Methods latest articles - Mon, 04/24/2017 - 10:51
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00161D, PaperLindsey Schacherer, Michaela Owens, Tiger Hu
Liquid chromatography with tandem mass spectrometry (LC-MS/MS) methods to quantify a membrane protein in genetically engineered maize leaves and another in soybean seeds were developed and validated. An extraction buffer...
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Practical Corrections for p(H,D) Measurements in Mixed H2O/D2O Biological Buffers

RSC - Anal. Methods latest articles - Mon, 04/24/2017 - 08:47
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00669A, Technical NoteK A Rubinson
Mixtures of light and heavy water are used in NMR, small-angle neutron scattering (SANS), growth media for producing deuterated biological molecules, and analytical methods such as Hydrogen-Deuterium Exchange (HDX) mass...
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Microchip-based 3D-cell culture using polymer nanofibers generated by solution blow spinning

RSC - Anal. Methods latest articles - Fri, 04/21/2017 - 12:18

Anal. Methods, 2017, Advance Article
DOI: 10.1039/C7AY00756F, PaperChengpeng Chen, Alexandra D. Townsend, Scott A. Sell, R. Scott Martin
Fibers produced by solution blow spinning (with a 3D printed sheath device) were integrated into a microfluidic device for 3D cell culture.
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Detection of small, highly structured RNAs by molecular beacons

RSC - Anal. Methods latest articles - Fri, 04/21/2017 - 09:16
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00341B, PaperJin Li, Chengzhen Xu, Naotaka Shimada, Yuichi Miyoshi, Kazunori Watanabe, Wang Cong, Takashi Ohtsuki
The use of molecular beacons is a versatile method to detect RNAs. Typically, a single-stranded region of RNA is selected as a target sequence for molecular beacons. Therefore, detection of...
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Nitrilotriacetate Stabilized Gold Nanoparticles: A Novel Strategy for Colorimetric Detection of Cr(III)/Cr(VI) and Mechanistic Aspect

RSC - Anal. Methods latest articles - Fri, 04/21/2017 - 09:16
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00989E, PaperJianyu Wei, luming Yang, guozong yue, jing zhu, deshun huang, Pengxiang Zhao
Nitrilotriacetate (NTA) is reported to behave as both reductant and stabilizer for gold nanoparticle (AuNP) preparation in one-pot synthesis and colorimetric assay. The goal is to avoid the negative influence...
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New Particle-based Trace Explosive Test Material Produced by Drop-On-Demand Inkjet Printing for Quantitative Wipe-Sampling Studies

RSC - Anal. Methods latest articles - Fri, 04/21/2017 - 07:15
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00554G, PaperJennifer R. Verkouteren, Jeffrey Lawrence, Timothy Brewer, Edward Sisco
A new approach is described to prepare particle standards of the explosive 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) for use in quantitative wipe-sampling studies. Screening activities to detect traces of explosives are heavily focused...
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Electrochemical catalysis of artemisinin on hemoglobin functionalized carbon nanofibers

RSC - Anal. Methods latest articles - Thu, 04/20/2017 - 10:11
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00431A, PaperZahilis Mazzochette, Newton Ebenezer, Amos Mugweru
Abstract Artemisinin (ART) is a sesquiterpene lactone and a popular malaria drug used in Asian subcontinent and some parts of Africa. Understanding the mechanism of action of this drug is...
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Automated development of an LC-MS/MS method for measuring multiple vitamin D metabolites using MUSCLE software

RSC - Anal. Methods latest articles - Thu, 04/20/2017 - 10:11
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00550D, PaperCarl Jenkinson, James Bradbury, Angela Taylor, John S Adams, Shan He, Mark Viant, Martin Hewison
Manual development of liquid chromatography tandem-mass spectrometry (LC-MS/MS) methods is a rate limiting step in analytical laboratories, particularly if several compounds have the same multiple reaction monitoring (MRM) transitions. This...
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Development and validation of a novel lateral flow immunoassay device for detection of aflatoxins in soy-based foods

RSC - Anal. Methods latest articles - Wed, 04/19/2017 - 08:01
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00601B, PaperVanessa Olinto Evangelista, Patricia Barbosa Pelegrini, Fernanda Mulinari, Ariane Lacerda, Rodrigo Moura, Ludimila PV Cardoso, Samira Buhrer-Sekula, Robert NG Miller, Maria Fatima Grossi de Sa
Aflatoxins (AFs) are natural toxins produced as secondary fungal metabolites. Common in diverse commodities, the consumption of aflatoxin-contaminated foodstuffs have harmful effects on human health mainly due to its carcinogenic...
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Preparation of gold nanoparticles coated NaYF4:Yb,Er,Gd nanoparticles and their application for AFP in the red region

RSC - Anal. Methods latest articles - Wed, 04/19/2017 - 08:01
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00751E, PaperYuanhui Ma, Liping Zhang, Lei Wang, Lun Wang, Hongqi Chen
A novel surface plasmon resonance (SPR) enhanced upconversion (UC) luminescence system was designed for the detection of [small alpha]-fetoprotein (AFP) by using gold nanoparticles (NPs) coated NaYF4:Yb,Er,Gd upconversion nanoparticles (UCNPs). The...
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Gold Nanoparticle Aggregation Enables Colorimetric Sensing Assays for Enzymatic Decarboxylation

RSC - Anal. Methods latest articles - Wed, 04/19/2017 - 08:01
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00642J, CommunicationMohamed Nilam, Andreas Hennig, Werner M Nau, Khaleel I. Assaf
Monitoring enzymatic processes is of fundamental importance for the understanding of the associated biological phenomena. In this work, we show that amino acid decarboxylase activity can be readily monitored by...
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A fluorescent probe for specific lysosomes imaging in cells

RSC - Anal. Methods latest articles - Wed, 04/19/2017 - 07:01
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00524E, CommunicationNa Jiang, Bin Wang, Gengxiu Zheng, Yujing Xing, Chunxiao Wang, Qiufen Wang
Lyso-NA, a naphthalimide-based fluorescent probe is synthesized. M-DPT is found to possess high specificity to lysosome, superior photostability, and appreciable tolerance to microenvironmental changes. Thus, this probe is a highly...
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Biomonitoring method for the analysis of chromium and cobalt in human whole blood using inductively coupled plasma - kinetic energy discrimination - mass spectrometry (ICP-KED-MS)

RSC - Anal. Methods latest articles - Wed, 04/19/2017 - 07:01
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00430C, PaperJoaudimir Castro Georgi, Yuliya L. Sommer, Cynthia D Ward, Po-Yung Cheng, Robert L Jones, Kathy Caldwell
The Centers for Disease Control and Prevention developed a biomonitoring method to rapidly and accurately quantify chromium and cobalt in human whole blood by ICP-MS. Many metal-on-metal hip implants which...
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Development and optimization of a fast method for determination of statins in human plasma using microextraction by packed sorbent (MEPS) followed by ultra high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS)

RSC - Anal. Methods latest articles - Tue, 04/18/2017 - 10:48
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00185A, PaperScarlet Ortega, Alvaro dos Santos Neto , Fernando M Lancas
Miniaturized sample preparation techniques are very attractive in bioanalysis since reduced size of sample is required. Regarding that matter, an ultra high-performance liquid chromatographic-tandem mass spectrometry (UHPLC-MS/MS) microextraction by packed...
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An azidocoumarin-based fluorescent probe for imaging lysosomal hydrogen sulfide in living cells

RSC - Anal. Methods latest articles - Tue, 04/18/2017 - 09:46
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00862G, PaperQiao-Ling Xie, Wei Liu, Xianjun Liu, Fan Ouyang, Yong-Qing Kuang, Jian-Hui Jiang
A commercially available fluorescent hydrogen sulfide (H2S) probe 7-azido-4-methylcoumarin (AzMC) was developed into its lysosome-targeted counterpart Lyso-C via a four-step synthetic approach. Lyso-C displayed fast response (within 5 min), excellent...
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Au nanoparticles anchored on Ni(OH)2 nanowires with multicavities for selective electrochemical detection of dopamine

RSC - Anal. Methods latest articles - Tue, 04/18/2017 - 07:45
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00090A, PaperYanyi Fu, Qingling Sheng, Jianbin Zheng
Au nanoparticles supported on nickel hydroxide nanowires with multicavities (Au/m-Ni(OH)2) were synthesized and used for the enhanced electrochemical sensing of dopamine (DA). m-Ni(OH)2 nanowires were first fabricated based on an...
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Determination of Chloride and Nitrate in Dimethyl Carbonate with Column-Switching Ion Chromatography System

RSC - Anal. Methods latest articles - Mon, 04/17/2017 - 07:39
Anal. Methods, 2017, Accepted Manuscript
DOI: 10.1039/C7AY00906B, PaperDandan Guo, Chaoyan Lou, Meilan Chen, Binghe Zhu, Peimin Zhang, Nani Wang, Yan Zhu
Dimethyl carbonate (DMC) has been widely used in solvent, fuels, monomers and synthesis. Inorganic anions in DMC always have a big impact on product performance. An improvement has been performed...
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