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You searched for: Journal Analytica chimica acta Remove constraint Journal: Analytica chimica acta Publication Year 2016 Remove constraint Publication Year: 2016 Source 2016 v.911 Remove constraint Source: 2016 v.911
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1. An intimately bonded titanate nanotube–polyaniline–gold nanoparticle ternary composite as a scaffold for electrochemical enzyme biosensors

Author:
Liu, Xiaoqiang; Zhu, Jie; Huo, Xiaohe; Yan, Rui; Wong, Danny K.Y.
Source:
Analytica chimica acta 2016 v.911 pp. 59-68
ISSN:
0003-2670
Subject:
analytical chemistry; aniline; biosensors; detection limit; electrochemistry; electrodes; electron transfer; hydrogen peroxide; nanogold; nanoparticles; nanotubes; nanowires; peroxidase; polymerization
Abstract:
... In this work, titanate nanotubes (TNTs), polyaniline (PANI) and gold nanoparticles (GNPs) were assembled to form a ternary composite, which was then applied on an electrode as a scaffold of an electrochemical enzyme biosensor. The scaffold was constructed by oxidatively polymerising aniline to produce an emeraldine salt of PANI on TNTs, followed by gold nanoparticle deposition. A novel aspect of t ...
DOI:
10.1016/j.aca.2016.01.024

2. Application of direct-injection detector integrated with the multi-pumping flow system to chemiluminescence determination of the total polyphenol index

Author:
Nalewajko-Sieliwoniuk, Edyta; Iwanowicz, Magdalena; Kalinowski, Sławomir; Kojło, Anatol
Source:
Analytica chimica acta 2016 v.911 pp. 82-91
ISSN:
0003-2670
Subject:
analytical chemistry; chemiluminescence; detection limit; energy; ethanol; formaldehyde; gallic acid; herbs; manganese; mixing; plant-based foods; polyphenols; spices; tea; vegetable juices; wines
Abstract:
... In this work, we present a novel chemiluminescence (CL) method based on direct-injection detector (DID) integrated with the multi-pumping flow system (MPFS) to chemiluminescence determination of the total polyphenol index. In this flow system, the sample and the reagents are injected directly into the cone-shaped detection cell placed in front of the photomultiplier window. Such construction of th ...
DOI:
10.1016/j.aca.2016.01.033

3. A review of recent methods for the determination of ranges of feasible solutions resulting from soft modelling analyses of multivariate data

Author:
Golshan, Azadeh; Abdollahi, Hamid; Beyramysoltan, Samira; Maeder, Marcel; Neymeyr, Klaus; Rajkó, Robert; Sawall, Mathias; Tauler, Romá
Source:
Analytica chimica acta 2016 v.911 pp. 1-13
ISSN:
0003-2670
Subject:
analytical chemistry; data collection; models; multivariate analysis
Abstract:
... Soft modelling or multivariate curve resolution (MCR) are well-known methodologies for the analysis of multivariate data in many different application fields. Results obtained by soft modelling methods are very likely impaired by rotational and scaling ambiguities, i.e. a full range of feasible solutions can describe the data equally well while fulfilling the constraints of the system. These issue ...
DOI:
10.1016/j.aca.2016.01.011

4. Determination of creatinine-related molecules in saliva by reversed-phase liquid chromatography with tandem mass spectrometry and the evaluation of hemodialysis in chronic kidney disease patients

Author:
Suzuki, Mayu; Furuhashi, Mitsuyoshi; Sesoko, Shogo; Kosuge, Kazuhiro; Maeda, Toshio; Todoroki, Kenichiro; Inoue, Koichi; Min, Jun Zhe; Toyo'oka, Toshimasa
Source:
Analytica chimica acta 2016 v.911 pp. 92-99
ISSN:
0003-2670
Subject:
analytical chemistry; arginine; blood serum; chromium; creatine; creatinine; dialysis; hemodialysis; ions; kidney diseases; monitoring; patients; renal function; reversed-phase liquid chromatography; saliva; tandem mass spectrometry; urea; volunteers
Abstract:
... The serum concentrations of creatinine (Cre) and urea are used for the determination of the renal function. However, the use of blood is not always suitable due to the invasive, hygienic and infection problems during its sample collection and handling. In contrast, saliva is relatively clean and the samples can be quickly and noninvasively collected and easily stored. Therefore, the simultaneous d ...
DOI:
10.1016/j.aca.2016.01.032

5. Development of a BODIPY-based ratiometric fluorescent probe for hypochlorous acid and its application in living cells

Author:
Wang, Xuzhe; Zhou, Li; Qiang, Fei; Wang, Feiyi; Wang, Rui; Zhao, Chunchang
Source:
Analytica chimica acta 2016 v.911 pp. 114-120
ISSN:
0003-2670
Subject:
absorption; analytical chemistry; cell membranes; fluorescent dyes; image analysis; macrophages; pH
Abstract:
... A BODIPY-based ratiometric fluorescent probe for HOCl has been designed based on the transduction of thioether to sulfoxide function. This probe features a marked absorption and emission blue-shift upon the HOCl-promoted rapid transduction, enabling the highly selective and ratiometric detection. In addition, the probe works excellently within a wide pH range of 4–10, addressing the existing pH de ...
DOI:
10.1016/j.aca.2016.01.022

6. Elucidating the structure of carbon nanoparticles by ultra-performance liquid chromatography coupled with electrospray ionisation quadrupole time-of-flight tandem mass spectrometry

Author:
Hu, Qin; Meng, Xiangpeng; Choi, Martin M.F.; Gong, Xiaojuan; Chan, Wan
Source:
Analytica chimica acta 2016 v.911 pp. 100-107
ISSN:
0003-2670
Subject:
analytical chemistry; carbon nanoparticles; chemical composition; citric acid; fluorescence; ionization; microwave treatment; pyrolysis; tandem mass spectrometry; ultra-performance liquid chromatography
Abstract:
... A fast and accurate ultra-performance liquid chromatography coupled with electrospray ionisation quadrupole time-of-flight tandem mass spectrometry (UPLC-ESI-Q-TOF-MS/MS) method was developed for the separation and structural elucidation of fluorescent carbon nanoparticles (CNP). The CNP was synthesised from microwave-assisted pyrolysis of citric acid (CA) and 1,2-ethylenediamine (EDA). By using U ...
DOI:
10.1016/j.aca.2016.01.034

7. Enhanced target factor analysis

Author:
Rostami, Akram; Abdollahi, Hamid; Maeder, Marcel
Source:
Analytica chimica acta 2016 v.911 pp. 35-41
ISSN:
0003-2670
Subject:
analytical chemistry; computers; data collection; factor analysis; wavelengths
Abstract:
... Target testing or target factor analysis, TFA, is a well-established soft analysis method. TFA answers the question whether an independent target test vector measured at the same wavelengths as the collection of spectra in a data matrix can be excluded as the spectrum of one of the components in the system under investigation. Essentially, TFA cannot positively prove that a particular test spectru ...
DOI:
10.1016/j.aca.2016.01.019

8. Flow method based on cloud point extraction for fluorometric determination of epinephrine in human urine

Author:
Davletbaeva, Polina; Falkova, Marina; Safonova, Evgenia; Moskvin, Leonid; Bulatov, Andrey
Source:
Analytica chimica acta 2016 v.911 pp. 69-74
ISSN:
0003-2670
Subject:
analytical chemistry; derivatization; detection limit; epinephrine; fluorometry; humans; nonionic surfactants; separation; urine; wavelengths
Abstract:
... A novel stepwise injection fluorometric method for the determination of epinephrine in human urine has been developed. In the current study, the stepwise injection analysis (SWIA) was successfully combined with on-line in-syringe cloud point extraction (CPE) and fluorometric detection. The procedure was based on the epinephrine derivatization in the presence of o-phenylenediamine followed by the p ...
DOI:
10.1016/j.aca.2015.12.045

9. In situ sulfur isotopes (δ34S and δ33S) analyses in sulfides and elemental sulfur using high sensitivity cones combined with the addition of nitrogen by laser ablation MC-ICP-MS

Author:
Fu, Jiali; Hu, Zhaochu; Zhang, Wen; Yang, Lu; Liu, Yongsheng; Li, Ming; Zong, Keqing; Gao, Shan; Hu, Shenghong
Source:
Analytica chimica acta 2016 v.911 pp. 14-26
ISSN:
0003-2670
Subject:
analytical chemistry; isotope fractionation; isotopes; lasers; nitrogen; normal values; pellets; plateaus; sulfides; sulfur
Abstract:
... The sulfur isotope is an important geochemical tracer in diverse fields of geosciences. In this study, the effects of three different cone combinations with the addition of N2 on the performance of in situ S isotope analyses were investigated in detail. The signal intensities of S isotopes were improved by a factor of 2.3 and 3.6 using the X skimmer cone combined with the standard sample cone or t ...
DOI:
10.1016/j.aca.2016.01.026

10. MSFIA-LOV system for 226Ra isolation and pre-concentration from water samples previous radiometric detection

Author:
Rodríguez, Rogelio; Borràs, Antoni; Leal, Luz; Cerdà, Víctor; Ferrer, Laura
Source:
Analytica chimica acta 2016 v.911 pp. 75-81
ISSN:
0003-2670
Subject:
World Health Organization; adsorption; analytical chemistry; barium sulfate; cellulose; coprecipitation; detection limit; drinking water; flow injection analysis; hydroxylamine; manganese; manganese dioxide; porous media; radiometry; radionuclides; radium; sampling; seawater
Abstract:
... An automatic system based on multisyringe flow injection analysis (MSFIA) and lab-on-valve (LOV) flow techniques for separation and pre-concentration of 226Ra from drinking and natural water samples has been developed. The analytical protocol combines two different procedures: the Ra adsorption on MnO2 and the BaSO4 co-precipitation, achieving more selectivity especially in water samples with low ...
DOI:
10.1016/j.aca.2016.01.004

11. Novel redox species polyaniline derivative-Au/Pt as sensing platform for label-free electrochemical immunoassay of carbohydrate antigen 199

Author:
Wang, Liyuan; Shan, Jiao; Feng, Feng; Ma, Zhanfang
Source:
Analytica chimica acta 2016 v.911 pp. 108-113
ISSN:
0003-2670
Subject:
analytical chemistry; antigens; blood serum; detection limit; electrochemistry; electron transfer; enzyme-linked immunosorbent assay; humans; hydrogen peroxide; nanocomposites
Abstract:
... A novel electrochemical redox-active nanocomposite was synthesized by a one-pot method using N,N′-diphenyl-p-phenylediamine as monomer, and HAuCl4 and K2PtCl4 as co-oxidizing agents. The as-prepared poly(N,N′-diphenyl-p-phenylediamine)-Au/Pt exhibited admirable electrochemical redox activity at 0.15 V, excellent H2O2 electrocatalytic ability and favorable electron transfer ability. Based on these, ...
DOI:
10.1016/j.aca.2016.01.016

12. Toward automated chromatographic fingerprinting: A non-alignment approach to gas chromatography mass spectrometry data

Author:
Vestner, Jochen; de Revel, Gilles; Krieger-Weber, Sibylle; Rauhut, Doris; du Toit, Maret; de Villiers, André
Source:
Analytica chimica acta 2016 v.911 pp. 42-58
ISSN:
0003-2670
Subject:
analytical chemistry; data collection; deformation; detectors; gas chromatography-mass spectrometry; models; volatile compounds; wines
Abstract:
... In contrast to targeted analysis of volatile compounds, non-targeted approaches take information of known and unknown compounds into account, are inherently more comprehensive and give a more holistic representation of the sample composition. Although several non-targeted approaches have been developed, there's still a demand for automated data processing tools, especially for complex multi-way da ...
DOI:
10.1016/j.aca.2016.01.020

13. Triple-channel portable capillary electrophoresis instrument with individual background electrolytes for the concurrent separations of anionic and cationic species

Author:
Mai, Thanh Duc; Le, Minh Duc; Sáiz, Jorge; Duong, Hong Anh; Koenka, Israel Joel; Pham, Hung Viet; Hauser, Peter C.
Source:
Analytica chimica acta 2016 v.911 pp. 121-128
ISSN:
0003-2670
Subject:
analytical chemistry; buffers; artificial sweeteners; food matrix; cations; preservatives; anions; capillary electrophoresis; user interface; beverages; additives
Abstract:
... The portable capillary electrophoresis instrument is automated and features three independent channels with different background electrolytes to allow the concurrent optimized determination of three different categories of charged analytes. The fluidic system is based on a miniature manifold which is based on mechanically milled channels for injection of samples and buffers. The planar manifold pa ...
DOI:
10.1016/j.aca.2016.01.029

14. Variable importance analysis based on rank aggregation with applications in metabolomics for biomarker discovery

Author:
Yun, Yong-Huan; Deng, Bai-Chuan; Cao, Dong-Sheng; Wang, Wei-Ting; Liang, Yi-Zeng
Source:
Analytica chimica acta 2016 v.911 pp. 27-34
ISSN:
0003-2670
Subject:
analytical chemistry; biomarkers; childhood obesity; data collection; metabolites; metabolomics; multivariate analysis; prediction
Abstract:
... Biomarker discovery is one important goal in metabolomics, which is typically modeled as selecting the most discriminating metabolites for classification and often referred to as variable importance analysis or variable selection. Until now, a number of variable importance analysis methods to discover biomarkers in the metabolomics studies have been proposed. However, different methods are mostly ...
DOI:
10.1016/j.aca.2015.12.043