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- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.024
- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.033
- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.011
- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.032
- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.022
- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.034
- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.019
- 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
-
http://dx.doi.org/10.1016/j.aca.2015.12.045
- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.026
- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.004
- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.016
- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.020
- 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
-
http://dx.doi.org/10.1016/j.aca.2016.01.029
- 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
-
http://dx.doi.org/10.1016/j.aca.2015.12.043