Showing papers in "Analytica Chimica Acta in 2014"

TL;DR: The different mechanisms responsible for the upconversion process, and methods that are used to synthesize and decorate upconverting nanoparticles are presented to indicate how absorption and emission can be tuned.

TL;DR: This paper critically reviews more than one hundred assays that are based on aptamer binding to thrombin, focusing on homogeneous binding assays, electrochemical aptasensors, and affinity separation techniques.

TL;DR: Sensors based breath analysis is expected to dramatically extend the diagnostic capabilities enabling the screening of large populations for the early diagnosis of pathologies and solid-state sensors are considered the natural complement to breath analysis.

TL;DR: An overview of the most relevant advances in SPR biosensing, including interesting analytical applications, together with different strategies that assure improvements in performance, throughput and/or integration and a brief summary of the main fabrication methodologies used in this field.

TL;DR: Several groups of potentially problematic compounds, including lipophilic compounds, hydrophilic substances and basic drugs, are discussed in detail and can be resolved with SFC but require specific analytical conditions.

TL;DR: The electrochemical results demonstrate that the G-MWCNTs nanocomposites can act as a kind of practical sensing material to simultaneously determine Pb(2+) and Cd( 2+) ions in terms of anodic stripping voltammetry (ASV).

TL;DR: An updated overview of the recent trends over the past five years in sample preparation techniques and methods for detectingulfonamides is provided.

TL;DR: Chemometric classification models were built on the separate blocks using soft independent modeling of class analogies and partial least squares-discriminant analysis obtaining good predictive ability on an external test set (75% or higher depending on the technique).

TL;DR: It was concluded that for small sample sets the Student's t-test based on the standard error of regression models must be used and special attention must be paid on the equality of the models variances.

TL;DR: An overview of latest achievements in methods and applications of mass spectrometry imaging (MSI) and metallomics have been in brain and cancer research, animal model validation, drug development and plant science.

TL;DR: The main aim of this review is to provide a brief knowledge about the different fields of analytical chemistry, with an emphasis on the latest efforts put into the electrically assisted membrane-based sample preparation systems.

TL;DR: A new type of tryptophan-functionalized graphene nanocomposite (Trp-GR) was synthesized by utilizing a facile ultrasonic method via π-π conjugate action between graphene (GR) and tryPTophan ( Trp) molecule to have well dispersivity in water and better conductivity than pure GR.

TL;DR: The problems and expected trends in this field are attempted to be discussed and proposed in order to encourage the further development of online SP-LC techniques.

TL;DR: The results show that IRIV is a good alternative for variable selection strategy when compared with three outstanding and frequently used variable selection methods such as genetic algorithm-PLS, Monte Carlo uninformative variable elimination by PLS and competitive adaptive reweighted sampling (CARS).

TL;DR: The application of μ-XANES imaging, a new combinatorial approach of X-ray fluorescence spectrometry and XANES spectroscopy at the micron scale, is one of the latest technological advances allowing for lateral resolution of chemical states over wide areas due to vastly improved data processing and detector technology.

TL;DR: An introduction to multi-way calibration based on second- and higher-order data generation and processing is provided, with emphasis on practical experimental aspects.

TL;DR: Developing μPADs to identify and quantify levels of nitrite in saliva, which has been proposed as a potential marker of periodontitis, and the potential impact of this technology in the healthcare industry is demonstrated.

TL;DR: In this article, a facile strategy for producing highly luminescent, surface-different nitrogen-doped carbon dots (c-dots) by using different ionic liquids (ils).

TL;DR: This review covers the period from 2000 till August 2013 of applications of enantioselective SFC in analytical chemistry, in both analytical and preparative scales.

TL;DR: This review is a compilation of principal official documents and major review articles, including the toxicology and chemistry of As, including comprehensive official compendia on As speciation, sample treatment, recommended procedures for the determination of As in specific sample matrices with specific analytical instrument(s), procedures for multi-element speciation and analysis, and prior comprehensive reviews on arsenic analysis.

TL;DR: The development and application of ion chromatography coupled to mass spectrometry (MS) is discussed herein for the quantitative determination of low-order explosives-related ionic species in environmental and forensic sample types and issues relating to environmental explosives contamination are examined.

TL;DR: The results showed that the nanocomposite modified by polyaniline with p-toluene sulfonic acid as a dopant demonstrated higher extraction efficiency for lorazepam (LRZ) and nitrazepams (NRZ) in urine and plasma samples.

TL;DR: An innovative and simple strategy for synthesizing high fluorescent Cu nanoclusters was successfully established while L-cysteine played a role as the stabilizer; thus facilitating the quenching of their fluorescence.

TL;DR: The results show that the combination of graphene and NiFe2O4 nanoparticles causes a dramatic enhancement in the sensitivity of the sensor, and would be valuable for the clinical assay of tramadol and acetaminophen.

TL;DR: New mercapto-grafted graphene oxide-magnetic chitosan (GO-MC) has been developed as a novel biosorbent for the preconcentration and extraction of mercury ion from water samples and good recoveries were obtained from 95 to 100%.

TL;DR: A number of equations are introduced which provides information on the spread of the peaks within the separation space in addition to measuring orthogonality, without the need for complex computations or division of the separated space into bins.

TL;DR: This review discusses the construction and application of SiNW-FET sensors for detection of ions, nucleic acids and protein markers, and discusses the future prospects of SiNFET sensors.

TL;DR: The protocol for A4F fractionation, including the methods described in the present work is proposed as a standardized strategy to realize interlaboratory comparability and to facilitate the selection and validation of material-specific measurement parameters and conditions.

TL;DR: A highly sensitive and specific fluorescent biosensor for blood glucose monitoring is developed based on hemin-functionalized graphene quantum dots (GQDs) and glucose oxidase (GOx) system and it is successfully applied to the determination of glucose in human serum.

TL;DR: A new solid-state reference electrode using a polymeric membrane of polyvinyl butyral (PVB), Ag/AgCl and NaCl to be used in decentralized chemical measurements is presented and shows good correlation when compared with a conventional double-junction reference electrode.