This blog has been set up for editors, reviewers, authors and readers of Elsevier's Analytical Chemistry Journals - all of which can be seen below. It will be updated from Monday to Friday with general news and announcements concerning the titles listed on this page. It should be noted that the views or claims made in the news items and feeds are not necessarily those of the Publisher.
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Just Published: Analytica Chimica Acta
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:
Publication date: 10 September
2013 Source:Analytica Chimica Acta, Volume 794 Author(s): Fang Zhu
, Jianqiao Xu , Yuanyuan Ke , Siming Huang , Feng Zeng , Tiangang Luan ,
Gangfeng Ouyang As a very popular sample preparation technique, solid-phase
microextraction (SPME) coupled with various analytical instrumentation, has been
widely used for the determination of trace levels of different plant compounds,
such as volatile organic compounds (VOCs) emitted from the different plant
organs, and environmental contaminants in plants. In this review, recent
applications of in vitro and in vivo SPME in plant analysis are discussed and
summarized according to the different organs of plants, including fruits,
flowers, leaves, stems, roots and seeds, and the whole plant as well. Future
developments and applications of SPME in plant analysis, especially in vivo
sampling approaches, are also prospected.
Publication date: 10 September
2013 Source:Analytica Chimica Acta, Volume 794 Author(s): Wan-Hsuan
Hsu , Shiuh-Jen Jiang , A.C. Sahayam Inductively coupled plasma mass
spectrometry coupled with ultrasonic slurry sampling electrothermal vaporization
(USS-ETV-ICP-MS) has been applied to determine Pd, Rh, Pt and Au in 0.5% m/v
slurries of several road dust samples. 2% m/v ammonium pyrrolidine
dithiocarbamate (APDC) was used as the modifier to enhance the ion count. The
influence of instrument operating conditions, slurry preparation and
interferences on the ion count was reported. This method has been applied to the
determination of Pd, Rh, Pt and Au in BCR 723 Road Dust and NIST SRM 2709 San
Joaquin Soil reference materials and two road dust samples collected locally.
The analysis results of the standard reference materials agreed with the
certified values. Precision between sample replicates was better than 10% for
all the determinations. The method detection limits estimated from standard
addition curves were 0.9, 0.4, 0.6 and 0.4ngg−1 for Pd, Rh, Pt and
Au, respectively, in original dust samples.
Publication date: 10 September
2013 Source:Analytica Chimica Acta, Volume 794 Author(s): Amrita
Malik , Roma Tauler This study focuses on the development and extension of
Multivariate Curve Resolution-Alternating Least Squares (MCR-ALS) to the
analysis of four-way datasets. The proposed extension of the MCR-ALS method with
non-negativity and the newly developed quadrilinear constraints can be exploited
to summarize and manage huge multidimensional datasets and resolve their four
way component profiles. In this study, its application is demonstrated by
analyzing a four-way data set obtained in a long term environmental monitoring
study (15 sampling sites×9 variables×12 months×7 years) belonging to the Yamuna
River, one of the most polluted rivers of India and the largest tributary of the
Ganges river. MCR-ALS resolved pollution profiles described appropriately the
major observed changes on pH, organic pollution, bacteriological pollution and
temperature, along with their spatial and temporal distribution patterns for the
studied stretch of Yamuna River. Results obtained by MCR-ALS have also been
compared with those obtained by another multi-way method, PARAFAC. The
methodology used in this study is completely general and it can be applied to
other multi-way datasets.
Publication date: 10 September
2013 Source:Analytica Chimica Acta, Volume 794 Author(s): Michael
Kemmler , Erik Rodner , Petra Rösch , Jürgen Popp , Joachim Denzler Raman
spectroscopy is successfully used for the reliable classification of complex
biological samples. Much effort concentrates on the accurate prediction of known
categories for highly relevant tasks in a wide area of applications such as
cancer detection and bacteria recognition. However, the resulting recognition
systems cannot always be directly used in practice since unseen samples might
not belong to classes present in the training set. Our work aims to tackle this
problem of novelty detection using a recently proposed approach based on
Gaussian processes. By learning novelty scores for a large bacteria Raman
dataset comprising 50 different strains, we analyze the behavior of this method
on an independent dataset which includes known as well as unknown categories.
Our experiment reveals that non-parametric methods such as Gaussian processes
can be successfully applied to the task of finding unknown bacterial strains,
leading to encouraging results motivating their further utilization in this
area.
Publication date: 10 September
2013 Source:Analytica Chimica Acta, Volume 794 Author(s): Habib
Bagheri , Rasoul Daliri , Ali Roostaie A novel
Fe3O4–poly(aniline-naphthylamine)-based nanocomposite was synthesized by
chemical oxidative polymerization process as a magnetic sorbent for micro solid
phase extraction. The scanning electron microscopy images of the synthesized
nanocomposite revealed that the copolymer posses a porous structure with
diameters less than 50nm. The extraction efficiency of this sorbent was examined
by isolation of rhodamine B, a mutagenic and carcinogenic dye, from aquatic
media in dispersion mode. Among different synthesized polymers,
Fe3O4/poly(aniline-naphthylamine) nanocomposite showed a prominent efficiency.
Parameters including the desorption solvent, amount of sorbent, desorption time,
sample pH, ionic strength, extraction time and stirring rate were optimized.
Under the optimum condition, a linear spiked calibration curve in the range of
0.35–5.00μgL−1 with R 2 =0.9991 was obtained. The limits
of detection (3S b) and limits of quantification (10S b) of the method were
0.10μgL−1 and 0.35μgL−1 (n =3), respectively. The relative
standard deviation for water sample with 0.5μgL−1 of RhB was 4.2% (n
=5) and the absolute recovery was 92%. The method was applied for the
determination of rhodamine B in dishwashing foam, dishwashing liquid, shampoo,
pencil, matches tips and eye shadows samples and the relative recovery
percentage were in the range of 94–99%.
Publication date: 10 September
2013 Source:Analytica Chimica Acta, Volume 794 Author(s): Yong Zhu
, Dongxing Yuan , Yongming Huang , Jian Ma , Sichao Feng Combining
fluorescence detection with flow analysis and solid phase extraction (SPE), a
highly sensitive and automatic flow system for measurement of ultra-trace
ammonium in open ocean water was established. Determination was based on
fluorescence detection of a typical product of o-phthaldialdehyde and ammonium.
In this study, the fluorescence reaction product could be efficiently extracted
onto an SPE cartridge (HLB, hydrophilic–lipophilic balance). The extracted
fluorescence compounds were rapidly eluted with ethanol and directed into a flow
cell for fluorescence detection. Compared with the common used fluorescence
method, the proposed one offered the benefits of improved sensitivity, reduced
reagent consumption, negligible salinity effect and lower cost. Experimental
parameters were optimized using a univariate experimental design. Calibration
curves, ranging from 1.67 to 300nM, were obtained with different reaction times.
The recoveries were between 89.5 and 96.5%, and the detection limits in
land-based and shipboard laboratories were 0.7 and 1.2nM, respectively. The
relative standard deviation was 3.5% (n =5) for an aged seawater sample spiked
with 20nM ammonium. Compared with the analytical results obtained using the
indophenol blue method coupled to a long-path liquid waveguide capillary cell,
the proposed method showed good agreement. The method had been applied on board
during a South China Sea cruise in August 2012. A vertical profile of ammonium
in the South East Asia Time-Series (SEATS, 18° N, 116° E) station was produced.
The distribution of ammonium in the surface seawater of the Qiongdong upwelling
in South China Sea is also presented.
Publication date: 10 September
2013 Source:Analytica Chimica Acta, Volume 794 Author(s):
Venkatesulu Salla , Kermit K. Murray Matrix-assisted laser desorption
ionization (MALDI) time of flight mass spectrometry was used to identify shrimp
at the species level using commercial mass spectral fingerprint matching
software (Bruker Biotyper). In the first step, a mass spectrum reference
database was constructed from the analysis of six commercially important shrimp
species: Litopenaeus setiferus, Farfantepenaeus aztecus, Sicyonia brevirostris,
Pleoticus robustus, Pandalopsis dispar and Pandalus platyceros. This step
required a desalting procedure for optimum performance. In the second step, the
reference database was tested using 74 unknown shrimp samples from these six
species. Correct identification was achieved for 72 of 74 samples (97%): 72
samples were identified at the species level and 2 samples were identified at
the genus level using the manufacturer's log score specifications. The MALDI
fingerprinting method for the identification of shrimp species was found to be
reproducible and accurate with rapid analysis.
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