Just Published: Trends in Analytical Chemistry

A new issue of this journal has just been published. To see abstracts of the papers it contains (with links through to the full papers) click here:

Trends in Analytical Chemistry
http://rss.sciencedirect.com/publication/science/5787

Selected papers from the latest issue:

1.

Analysis of biopharmaceutical proteins in biological matrices by LC-MS/MS I. Sample preparation   Review Article Available online 13 April 2013 Rainer Bischoff, Kees J. Bronsema, Nico C. van de Merbel

2.

Analytical Strategies for Real-Time and Non-Invasive Tracking of Carbon Nanomaterials in vivo   Review Article Available online 13 April 2013 Aijuan Liu, Shumei Zhai, Bin Zhang, Bing Yan

3.

Analytical and bioanalytical problems associated with the toxicity of elemental sulfur in the environment   Review Article Available online 13 April 2013 Karolina Kuklińska, Lidia Wolska, Jacek Namieśnik, Monika Cieszyńska, Lidia Wolska

4.

Functionalization and dispersion of carbon nanotubes in ionic liquids   Review Article Available online 12 April 2013 M.L. Polo-Luque, B.M. Simonet, M. Valcárcel

5.

Stationary phases for separation of nucleosides and nucleotides by hydrophilic interaction liquid chromatography   Review Article Available online 12 April 2013 D. García-Gómez, E. Rodríguez-Gonzalo, R. Carabias-Martínez

6.

Pittcon logs another success    Available online 12 April 2013 I. Mitch Taylor, Stephen R. Groskreutz, Andrea Jaquins Gerstl, Jing Zhang, Stephen G. Weber

7.

In the news    Available online 10 April 2013

8.

New materials in solid-phase microextraction   Review Article Available online 9 April 2013 Jianqiao Xu, Juan Zheng, Jingyu Tian, Fang Zhu, Feng Zeng, Chengyong Su, Gangfeng Ouyang

KF Coulometric Titrator Ideal for Trace Water Level Content

JM Science announces their new AQUACOUNTER® Karl Fischer Coulometric Titrator (AQ-2200S). This high-end titrator is ideal for the trace level water content determination with its excellent capability and upgraded performance.

It will be of interest for users who: 1) have many kinds of samples to be analyzed; 2) exchange KF reagents frequently or after each measurement; 3) are eco-minded and budget-conscious.

The titrator allows two titration stations to run parallel with various coulometric/volumetric combinations. With both a volumetric and coulometric channel, one can measure moisture over the entire range from 1 ppm to 100% or double your sample throughput with 2 identical KF stations. This design is economical and ecological because it reduces the use of expensive KF reagents. Three types of electrolytic cells are available including small volume, standard, and one-room cell. There is an ultra-trace moisture measurement mode equipped in this titrator with an accuracy of ≤10µgH20.   The cell design allows for easy assembly and maintenance. The 7.5-inch color touch screen is easy to read and operate. It has enhanced memory capacity and user may store results on a USB flash memory stick. The stored data can be read out on the color display. Result data with curves may be viewed on a PC internet browsing program with optional software. This titrator comes equipped with a built-in thermal printer with easy paper loading and high-resolution printouts. It can be used with peripherals of previous versions. 

NEW Economical Tubing Pumps

Aalborg® Instruments announced the expansion of its economical TP Peristaltic Pump line. TPV models are designed for liquids of low to high viscosity and can also accommodate fuels with the appropriate tubing.

TPV Pump Systems ensure stable performance and accurate, repeatable liquid transfer applications. They are ideal for laboratory, processing, and OEM applications.

TPV Pump Features: All Models

• Long tubing life
• 3 - 316 stainless steel rollers and shafts
• Can be mounted in any direction
• Controls for prime, brake, rpm, reverse flow direction, power LED
• Adjustable handle to carry, hang, or stand pump
• Safety cover
• Maintenance-free 24 VDC brushless motor
• Speed adjustable from 0 to 300 rpm
• Unique adjustable tubing holder assembly
• Fixed occlusion wall

TPV Pump Systems and Additional Model Features:

Pump Heads: Simply attach the pump head to your motor via existing mounting holes or to one purchased from Aalborg®.

TPVAD: AD Model Adjustable RPM Pumps: Standard features.

TPVDP: DP Model Adjustable RPM Pumps with Dispensing: Remote Start/Stop option is available. Set timer relay to dispense or to stop dispensing liquids over a selected time period to either Shot Mode or to Continuous Pulse Mode.

TPVRP: RP Model Adjustable RPM Pumps with Dispensing: Set timer relay to dispense liquids for a selected time period and to stop dispensing for another selected time period.

Flow Rate Ranges: 8 ml/min to 377 ml/min dependent on motor speed and tubing size.

Just Published:Biosensors & Bioelectronics

A new issue of this journal has just been published. To see abstracts of the papers it contains (with links through to the full papers) click here:

Biosensors & Bioelectronics
http://rss.sciencedirect.com/publication/science/5223

Selected papers from the latest issue:

1.

Fluorescent Molecularly Imprinted Polymer Thin Films for Specific Protein Detection Prepared with Dansyl Ethylenediamine-Conjugated O-Acryloyl L-Hydroxyproline   Original Research Article Available online 6 April 2013 Yuki Inoue, Atsushi Kuwahara, Kohei Ohmori, Hirobumi Sunayama, Tooru Ooya, Toshifumi Takeuchi

2.

MultisHRP-DNA-coated CMWNTs as signal labels for an ultrasensitive hepatitis C virus core antigen electrochemical immunosensor   Original Research Article Available online 6 April 2013 Cuixia Ma, Mo Liang, Li Wang, Hua Xiang, Yingtao Jiang, Yiyan Li, Guoming Xie

3.

Naked-eye Detection of Nucleic Acids through Rolling Circle Amplification and Magnetic Particle Mediated Aggregation   Original Research Article Available online 6 April 2013 Caiqin Lin, Yunxia Zhang, Xin Zhou, Bo Yao, Qun Fang Graphical abstract

4.

A compact hybrid-multiplexed potentiostat for real-time electrochemical biosensing applications   Original Research Article Available online 6 April 2013 Ioannis Ramfos, Nikolaos Vassiliadis, Spyridon Blionas, Konstantinos Efstathiou, Alex Fragoso, Ciara K. O'Sullivan, Alexios Birbas

5.

Ultrafast Molecular Motor Driven Nanoseparation and Biosensing   Original Research Article Available online 6 April 2013 Mercy Lard, Lasse ten Siethoff, Saroj Kumar, Malin Persson, Geertruy te Kronnie, Heiner Linke, Alf Månsson

6.

Electrochemical cholesterol sensor based on carbon nanotube @molecularly imprinted polymer modified ceramic carbon electrode   Original Research Article Available online 6 April 2013 Yuejin Tong, Haidong Li, Huaimin Guan, Jianming Zhao, Saadat Majeed, Saima Anjum, Feng Liang, Guobao Xu

7.

Miniaturized flow system based on enzyme modified PMMA microreactor for amperome5tric determination of glucose   Original Research Article Available online 6 April 2013 Luís Marcos Cerdeira Ferreira, Eric Tavares da Costa, Claudimir Lucio do Lago, Lúcio Angnes

8.

Label-free and sensitive strategy for microRNAs detection based on the formation of boronate ester bonds and the dual-amplification of gold nanoparticles   Original Research Article Available online 6 April 2013 Ning Xia, Liping Zhang, Guifang Wang, Qingqin Feng, Lin Liu

9.

Supersandwich-type electrochemiluminescenct aptasensor based on Ru (phen)32+ functionalized hollow gold nanoparticles as signal-amplifying tags   Review Article Available online 6 April 2013 Guofeng Gui, Ying Zhuo, Ya-Qin Chai, Ni Liao, Min Zhao, Jing Han, Qiang Zhu, Ruo Yuan, Yun Xiang

10.

Time-resolved chemiluminescence strategy for multiplexed immunoassay of clenbuterol and ractopamine    Available online 6 April 2013 Jing Han, Hongfei Gao, Wenwen Wang, Zhenxing Wang, Zhifeng Fu

11.

Potentiometric sensing of nuclease activities and oxidative damage of single-stranded DNA using a polycation-sensitive membrane electrode   Original Research Article Available online 6 April 2013 Jiawang Ding, Wei Qin

12.

Development of a high-sensitivity immunoassay for amyloid-beta 1–42 using a silicon microarray platform   Original Research Article Available online 6 April 2013 Paola Gagni, Laura Sola, Marina Cretich, Marcella Chiari

13.

Bead Assembly Magnetorotation as a Signal Transduction Method for Protein Detection   Original Research Article Available online 6 April 2013 Ariel Hecht, Patrick Commiskey, Nicholas Shah, Raoul Kopelman

14.

Ultrasensitive and Selective Gold Film-based Detection of Mercury (II) in Tap Water Using a Laser Scanning Confocal Imaging-surface Plasmon Resonance System in Real Time   Original Research Article Available online 5 April 2013 Hongyan Zhang, Liquan Yang, Bingjiang Zhou, Weimin Liu, Jiechao Ge, Jiasheng Wu, Ying Wang, Pengfei Wang

15.

Nickel Nanoparticle-Chitosan-Reduced Graphene Oxide-Modified Screen-Printed Electrode for Enzyme-Free Glucose Sensing in Portable Microfluidic Devices   Original Research Article Available online 3 April 2013 Jiang Yang, Ji-Hyuk Yu, J. Rudi Strickler, Woo-Jin Chang, Sundaram Gunasekaran

16.

Stainless steel modified with an aminosilane layer and gold nanoparticles as a novel disposable substrate for impedimetric immunosensors   Original Research Article Available online 3 April 2013 Behzad Rezaei, Elaheh Havakeshian, Ali A. Ensafi

17.

Improving Biocompatibility by Surface Modification Techniques onImplantable Bioelectronics   Review Article Available online 3 April 2013 Peter Lin, Chii-Wann Lin, Raafat Mansour, Frank Gu

18.

LSI-based amperometric sensor for real-time monitoring of embryoid bodies   Original Research Article Available online 3 April 2013 Mustafa Şen, Kosuke Ino, Kumi Y. Inoue, Toshiharu Arai, Taku Nishijo, Atsushi Suda, Ryota Kunikata, Hitoshi Shiku, Tomokazu Matsue

19.

A generic microfluidic biosensor of G protein-coupled receptor activation - Monitoring cytoplasmic [Ca2+] changes in human HEK293 cells   Original Research Article Available online 3 April 2013 Margriet Roelse, Norbert C.A. de Ruijter, Elwin X. Vrouwe, Maarten A. Jongsma

20.

Simultaneous capture and in situ analysis of circulating tumor cells using multiple hybrid nanoparticles   Original Research Article Available online 3 April 2013 Hun Joo Lee, Hyeon-Yeol Cho, Jin Ho Oh, Kak Namkoong, Jeong Gun Lee, Jong-Myeon Park, Soo Suk Lee, Nam Huh, Jeong-Woo Choi Graphical abstract

21.

Electrochemical sensor based on molecularly imprinted polymer film via sol-gel technology and multi-walled carbon nanotubes-chitosan functional layer for sensitive determination of quinoxaline-2-carboxylic acid   Original Research Article Available online 2 April 2013 Yukun Yang, Guozhen Fang, Guiyang Liu, Mingfei Pan, Xiaomin Wang, Lingjie Kong, Xinlei He, Shuo Wang

22.

3-Aminophenyl boronic acid-functionalized CuInS2 quantum dots as a near-infrared fluorescence probe for the determination of dopamine   Original Research Article Available online 2 April 2013 Siyu Liu, Fanping Shi, Xiaojun Zhao, Lu Chen, Xingguang Su

23.

An amperometric glutamate biosensor based on immobilization of glutamate oxidase onto carboxylated multiwalled carbon nanotubes/gold nanoparticles/chitosan composite film modified Au electrode   Original Research Article Available online 2 April 2013 Bhawna Batra, C.S. Pundir

24.

A simple and sensitive fluorescence biosensor for detection of organophosphorus pesticides using H2O2-sensitive quantum dots/bi-enzyme   Original Research Article Available online 2 April 2013 Xianwei Meng, Jianfei Wei, Xiangling Ren, Jun Ren, Fangqiong Tang

25.

A sensitive electrochemical aptasensor for thrombin detection based on exonuclease-catalyzed target recycling and enzyme-catalysis   Original Research Article Available online 2 April 2013 Huayu Yi, Wenju Xu, Yali Yuan, Yongmei Wu, Yaqin Chai, Ruo Yuan

26.

Longitudinal surface plasmon resonance assay enhanced by magnetosomes for simultaneous detection of Pefloxacin and Microcystin-LR in seafoods   Original Research Article Available online 1 April 2013 Xiulan Sun, Longyun Wu, Jian Ji, Donglei Jiang, Yinzhi Zhang, Zaijun Li, Genyi Zhang, Hongxia Zhang

27.

Sensitive chemiluminescence detection of wild-type p53 protein captured by surface-confined consensus DNA duplexes    Available online 1 April 2013 Xiaolan Chen, Chuhua He, Zhifan Zhang, Jianxiu Wang

28.

Highly sensitive recognition of Pb2+ using Pb2+ triggered exonuclease aided DNA recycling    Available online 31 March 2013 Hui Xu, Pingping Xu, Shanmin Gao, Shengxiao Zhang, Xingchun Zhao, Chunhai Fan, Xiaolei Zuo

Analyzing Soil Samples for Percentage Carbon, Hydrogen & Nitrogen

Application note 51* from Exeter Analytical Inc. illustrates how the Carbon, Hydrogen and Nitrogen (CHN) content of soil samples can be precisely and reproducibly determined using their Model 440 Elemental Analyzer.
The determination of the Carbon, Hydrogen and Nitrogen (CHN) content of soil samples is of major interest to environmental and agrochemical laboratories throughout the world.  Organic matter is known to directly influence the productive capacity of different soils as it is a major contributor of C, H as well as N, P, S and other nutrients. Percentage Carbon can be determined in both its inorganic and organic forms via acid pre-treatment or temperature differential measurement using an Exeter Analytical Model 440 Elemental Analyzer. The determination of the Nitrogen content of soils using a Model 440 Elemental Analyser saves considerable time and cost with no diminishment of data quality compared with the traditional Kjeldahl nitrogen determination method.

This application note includes details of the analytical methodology used plus data demonstrating the high quality of CHN data determination that is possible using a Model 440 Elemental Analyzer.

The Exeter Analytical Model 440 is a static combustion CHN Elemental Analyzer, with a unique horizontal furnace design, which enables easy removal of sample residue between each soil analysis.  Consequently one combustion tube will analyze in excess of 1000 soil samples without the need for removal and cleaning. By comparison other elemental analyzers, employing vertical furnace designs, will require cleaning after as little as 20 samples. The gas flow characteristics of the Model 440 analyzer are superior to other elemental analyzers due to the effective elimination of troublesome residue build-up. This thereby provides longer-term calibration stability as well as enhanced accuracy and precision for measured soil sample data.

In addition, as the Model 440 provides complete control over combustion parameters it is able to reproducibly achieve 100% combustion with the widest range of soil samples. Proprietary Nitrogen analysis software uniquely enables accurate measurement of low Nitrogen levels (in the 0.1-0.2% range) with a high degree of accuracy.

For a copy of this new application note please contact Exeter Analytical on +1-978-251-1411 / +44-2476-323223 (in Europe) or email sales@eai1.com. 

Gordon F. Kirkbright Bursary Award, 2014

The Gordon F. Kirkbright bursary award is a prestigious annual award that enables a promising student/non-tenured young scientist of any nation to attend a recognised scientific meeting or visit a place of learning.

The fund for this bursary was established in 1985 as a memorial to Professor Gordon Kirkbright in recognition of his contributions to analytical spectroscopy and to science in general. Although the fund is administered by the Association of British Spectroscopists (ABS) Trust, the award is not restricted to spectroscopists.

Applications are invited for the 2014 Gordon Kirkbright Bursary.

For further information contact John Chalmers at, email: vibspecconsult@aol.com

The closing date for entries is 31 December 2013.

Just Published: Journal of Pharmaceutical and Biomedical Analysis

A new issue of this journal has just been published. To see abstracts of the papers it contains (with links through to the full papers) click here:

Journal of Pharmaceutical and Biomedical Analysis
http://rss.sciencedirect.com/publication/science/5266

Selected papers from the latest issue:

1.

Reproducibility of the anti-factor Xa and anti-factor IIa assays applied to enoxaparin solution   Original Research Article Available online 6 April 2013 Céline Martinez, Adama Savadogo, Christophe Agut, Pascal Anger Graphical abstract

2.

Determination of dextromethorphan and levomethorphan in seized heroin samples by enantioselective HPLC and electronic CD    Available online 6 April 2013 Daniele Tedesco, Anna Maria Di Pietra, Francesca Rossi, Marco Garagnani, Elia Del Borrello, Carlo Bertucci, Vincenza Andrisano Graphical abstract

3.

Evaluation of the residual solvent content of counterfeit tablets and capsules   Original Research Article Available online 6 April 2013 E. Deconinck, M. Canfyn, P.-Y. Sacré, P. Courselle, J.O. De Beer Graphical abstract

4.

A comparative study on the pharmacokinetics of a traditional Chinese herbal preparation with the single herb extracts in rats by LC–MS/MS method   Original Research Article Available online 6 April 2013 Ying-guang Sun, Ying-feng Du, Kai Yang, Lu Chang, Liang Cao, Yan-ping Ren, Qian Sun, Qiao Wang, Lan-tong Zhang, Pin-tian lv Graphical abstract

5.

Application of Two-phase hollow fiber liquid phase microextraction coupled with high–performance liquid chromatography for the study of the echinacoside pharmacokinetics in Parkinson's disease rat plasma   Original Research Article Available online 3 April 2013 Jun Zhou, Ping Zeng, Jiang Bing Sun, Feng Qiao Wang, Qiong Zhang Graphical abstract Typical chromatograms of determination of Echinacoside (50ng mL−1) and IS in plasma samples; (A) plasma sample 1h after oral administration with Liquid-liquid extraction; (B) plasma sample 1h after oral administration with Two-phase hollow fiber liquid phase microextraction.

6.

Physico-chemical Solid-State Characterization of Pharmaceutical Pyrazolones: An Unexpected Thermal Behaviour    Available online 3 April 2013 Adriana Fuliaş, Ionuţ Ledeţi, Gabriela Vlase, Titus Vlase Graphical abstract

7.

Systematic identification and quantification of tetracyclic monoterpenoid oxindole alkaloids in Uncaria rhynchophylla and their fragmentations in Q-TOF-MS spectra   Original Research Article Available online 2 April 2013 Shuanglu Xie, Yuanyuan Shi, Chunyong Wu, Yixiang Wang, Wenyuan Liu, Feng Feng, Ning Xie Graphical abstract

8.

Isolation and characterization of bioactive compounds from plant resources: the role of analysis in the ethnopharmacological approach   Review Article Available online 2 April 2013 G. Brusotti, I. Cesari, A. Dentamaro, G. Caccialanza, G. Massolini