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:
Selected papers from the latest issue:DETERMINATION OF STEROID HORMONES IN BIOLOGICAL AND ENVIRONMENTAL SAMPLES USING GREEN MICROEXTRACTION TECHNIQUES: AN OVERVIEW
28 July 2011, 21:55:20
Publication year: 2011
Source: Analytica Chimica Acta, In Press, Accepted Manuscript, Available online 28 July 2011
Jana, Aufartová , Cristina, Mahugo-Santana , Zoraida, Sosa-Ferrera , José Juan, Santana-Rodríguez , Lucie, Nováková , ...
Residues of steroid hormones have become a cause for concern because they can affect the biological activity of non-target organisms. Steroid hormones are a potential risk for wildlife and humans through the consumption of contaminated food or water. Their determination requires extraction and clean-up steps, prior to detection, to reach low concentration levels. In recent years, a great effort has been made to develop new analytical methodologies, such as microextraction techniques, that reduce environmental pollution. Researchers have modified old methods to incorporate procedures that use less-hazardous chemicals or that use smaller amounts of them. They are able to do direct...
Highlights: ► Green analytical methodologies for the determination of hormones in environmental samples are reported. ► Applications in sorptive-microextraction modes such as MIPs, in-tube SPME, SBSE and MEPS are described. ► Liquid-phase microextraction approaches like HFME and SD-LPME are also included. ► Advantages and disadvantages are given for each technique. The need for automation, the use of experimental designs and new solvents are discussed.
Source: Analytica Chimica Acta, In Press, Accepted Manuscript, Available online 28 July 2011
Jana, Aufartová , Cristina, Mahugo-Santana , Zoraida, Sosa-Ferrera , José Juan, Santana-Rodríguez , Lucie, Nováková , ...
Residues of steroid hormones have become a cause for concern because they can affect the biological activity of non-target organisms. Steroid hormones are a potential risk for wildlife and humans through the consumption of contaminated food or water. Their determination requires extraction and clean-up steps, prior to detection, to reach low concentration levels. In recent years, a great effort has been made to develop new analytical methodologies, such as microextraction techniques, that reduce environmental pollution. Researchers have modified old methods to incorporate procedures that use less-hazardous chemicals or that use smaller amounts of them. They are able to do direct...
Highlights: ► Green analytical methodologies for the determination of hormones in environmental samples are reported. ► Applications in sorptive-microextraction modes such as MIPs, in-tube SPME, SBSE and MEPS are described. ► Liquid-phase microextraction approaches like HFME and SD-LPME are also included. ► Advantages and disadvantages are given for each technique. The need for automation, the use of experimental designs and new solvents are discussed.
Surface-enhanced Raman scattering detection of cholinesterase inhibitors
28 July 2011, 21:55:20
Publication year: 2011
Source: Analytica Chimica Acta, In Press, Accepted Manuscript, Available online 28 July 2011
Zvi, Liron , Adi, Zifman , Vered, Heleg-Shabtai
A new sensitive surface-enhanced Raman scattering (SERS) assay for detection of cholinesterase inhibitors such as organophosphorous pesticides using silver colloidal nanoparticles was developed and optimized. Acetylcholinesterase (AChE) mediated the hydrolysis of acetylthiocholine to produce thiocholine, which interacted with the silver nanoparticles to give a specific SERS spectrum. Variation in enzyme activity due to inhibition was measured from changes in intensity of a characteristic peak (772cm−1) of the SERS spectrum that was directly correlated with the concentration of produced thiocholine. The method was demonstrated for the detection of paraoxon as reference AChE inhibitor. Limit of detection of paraoxon for five min...
Highlights: ► A new sensitive surface-enhanced Raman scattering (SERS) assay for detection of cholinesterase inhibitors such as organophosphorous pesticides using silver colloidal nanoparticles was developed and optimized. ► Acetylcholinesterase (AChE) mediated the hydrolysis of acetylthiocholine to produce thiocholine, which interacted with the silver nanoparticles to give a specific SERS spectrum. ► The method was demonstrated for the detection of paraoxon as reference AChE inhibitor.
Source: Analytica Chimica Acta, In Press, Accepted Manuscript, Available online 28 July 2011
Zvi, Liron , Adi, Zifman , Vered, Heleg-Shabtai
A new sensitive surface-enhanced Raman scattering (SERS) assay for detection of cholinesterase inhibitors such as organophosphorous pesticides using silver colloidal nanoparticles was developed and optimized. Acetylcholinesterase (AChE) mediated the hydrolysis of acetylthiocholine to produce thiocholine, which interacted with the silver nanoparticles to give a specific SERS spectrum. Variation in enzyme activity due to inhibition was measured from changes in intensity of a characteristic peak (772cm−1) of the SERS spectrum that was directly correlated with the concentration of produced thiocholine. The method was demonstrated for the detection of paraoxon as reference AChE inhibitor. Limit of detection of paraoxon for five min...
Highlights: ► A new sensitive surface-enhanced Raman scattering (SERS) assay for detection of cholinesterase inhibitors such as organophosphorous pesticides using silver colloidal nanoparticles was developed and optimized. ► Acetylcholinesterase (AChE) mediated the hydrolysis of acetylthiocholine to produce thiocholine, which interacted with the silver nanoparticles to give a specific SERS spectrum. ► The method was demonstrated for the detection of paraoxon as reference AChE inhibitor.
A robust method for speciation, separation and photometric characterization of all [PtCl6-nBrn]2-(n=0–6) and [PtCl4-nBrn]2− (n=0–4) complex anions by means of ion-pairing RP-HPLC coupled to ICP-MS/OES, validated by high resolution 195Pt NMR spectroscopy
28 July 2011, 21:55:20
Publication year: 2011
Source: Analytica Chimica Acta, In Press, Accepted Manuscript, Available online 28 July 2011
Pieter-Hugo, van Wyk , Wilhelmus J., Gerber , Klaus R., Koch
A robust reversed phase ion-pairing RP-HPLC method has been developed for the unambiguous speciation and quantification of all possible homoleptic and heteroleptic octahedral platinumIV[PtCl6-nBrn]2− (n=0–6) as well as the corresponding platinumII [PtCl4-nBrn]2− (n=0–4) complex anions using UV/Vis detection. High resolution 195Pt NMR in more concentrated solutions of these PtII/IV complexes (≥ 50mM) served to validate the chromatographic peak assignments, particularly in the case of the possible stereoisomers of PtIV/II complex anions. By means of IP-RP-HPLC coupled to ICP-MS or ICP-OES it is possible to accurately determine the relative concentrations of all possible PtII/IV species in these solutions, which allows for...
Highlights: ► Ion-pairing RP-HPLC separation of all homoleptic and heteroleptic [PtCl6-nBrn]2− (n=0–6) and [PtCl4-nBrn]2− (n=0–4) ► High resolution 195Pt NMR validation of chromatographic peak assignments, including stereo-isomers of PtIV/II complexes ► IP-RP-HPLC coupled to ICP-MS/OES gives accurate concentrations of all PtII/IV species in aqueous acidic solutions ► UV/Vis photometric properties (λmax and ɛ) of all [PtCl6-nBrn]2− and [PtCl4-nBrn]2− complexes determined for future use
Source: Analytica Chimica Acta, In Press, Accepted Manuscript, Available online 28 July 2011
Pieter-Hugo, van Wyk , Wilhelmus J., Gerber , Klaus R., Koch
A robust reversed phase ion-pairing RP-HPLC method has been developed for the unambiguous speciation and quantification of all possible homoleptic and heteroleptic octahedral platinumIV[PtCl6-nBrn]2− (n=0–6) as well as the corresponding platinumII [PtCl4-nBrn]2− (n=0–4) complex anions using UV/Vis detection. High resolution 195Pt NMR in more concentrated solutions of these PtII/IV complexes (≥ 50mM) served to validate the chromatographic peak assignments, particularly in the case of the possible stereoisomers of PtIV/II complex anions. By means of IP-RP-HPLC coupled to ICP-MS or ICP-OES it is possible to accurately determine the relative concentrations of all possible PtII/IV species in these solutions, which allows for...
Highlights: ► Ion-pairing RP-HPLC separation of all homoleptic and heteroleptic [PtCl6-nBrn]2− (n=0–6) and [PtCl4-nBrn]2− (n=0–4) ► High resolution 195Pt NMR validation of chromatographic peak assignments, including stereo-isomers of PtIV/II complexes ► IP-RP-HPLC coupled to ICP-MS/OES gives accurate concentrations of all PtII/IV species in aqueous acidic solutions ► UV/Vis photometric properties (λmax and ɛ) of all [PtCl6-nBrn]2− and [PtCl4-nBrn]2− complexes determined for future use
A Carbohydrate Modified Fluoride Ion Sensor and Its Applications
28 July 2011, 21:55:20
Publication year: 2011
Source: Analytica Chimica Acta, In Press, Accepted Manuscript, Available online 27 July 2011
Guohua, Wei , Junxia, Yin , Xing, Ma , Shouyi, Yu , Dongbin, Wei , ...
A new fluorescent probe for the detection of F− (TBA+ and Na+ salts) has been developed, which is based on a desilylation triggered chromogenic reaction in water. This probe exhibits excellent F− ion selectivity as well as significant color changes visible to the naked eye at the concentration of 1.5mg/L, the WHO recommended level of F− ions in drinking water. This new carbohydrate modified probe can be used directly in aqueous medium without using organic co-solvents. Furthermore, the probe presents high sensitivity and selectivity for the imaging of F− ions in HepG2 cells.
Source: Analytica Chimica Acta, In Press, Accepted Manuscript, Available online 27 July 2011
Guohua, Wei , Junxia, Yin , Xing, Ma , Shouyi, Yu , Dongbin, Wei , ...
A new fluorescent probe for the detection of F− (TBA+ and Na+ salts) has been developed, which is based on a desilylation triggered chromogenic reaction in water. This probe exhibits excellent F− ion selectivity as well as significant color changes visible to the naked eye at the concentration of 1.5mg/L, the WHO recommended level of F− ions in drinking water. This new carbohydrate modified probe can be used directly in aqueous medium without using organic co-solvents. Furthermore, the probe presents high sensitivity and selectivity for the imaging of F− ions in HepG2 cells.
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