Single-walled carbon nanotubes as solid-phase microextraction adsorbent for the determination of low-level concentrations of butyltin compounds in seawater

2010 ◽  
Vol 662 (1) ◽  
pp. 90-96 ◽  
Author(s):  
Noushin Rastkari ◽  
Reza Ahmadkhaniha ◽  
Nasrin Samadi ◽  
Abbas Shafiee ◽  
Masud Yunesian
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Low Level ◽  
Walled Carbon Nanotubes ◽  
Butyltin Compounds ◽  
As Solid Phase

scholarly journals Simultaneous Determination of Parathion, Malathion, Diazinon, and Pirimiphos Methyl in Dried Medicinal Plants Using Solid-Phase Microextraction Fibre Coated with Single-Walled Carbon Nanotubes

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Reza Ahmadkhaniha ◽  
Nasrin Samadi ◽  
Mona Salimi ◽  
Parisa Sarkhail ◽  
Noushin Rastkari
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Microextraction ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Organophosphorus Pesticides ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Pirimiphos Methyl ◽  
Walled Carbon Nanotubes

A reliable and sensitive headspace solid-phase microextraction gas chromatography-mass spectrometry method for simultaneous determination of different organophosphorus pesticides in dried medicinal plant samples is described. The analytes were extracted by single-walled carbon nanotubes as a new solid-phase microextraction adsorbent. The developed method showed good performance. For diazinon and pirimiphos methyl calibration, curves were linear (r2≥0.993) over the concentration ranges from 1.5 to 300 ng g−1, and the limit of detection at signal-to-noise ratio of 3 was 0.3 ng g−1. For parathion and malathion, the linear range and limit of detection were 2.5–300 (r2≥0.991) and 0.5 ng g−1, respectively. In addition, a comparative study between the single-walled carbon nanotubes and a commercial polydimethylsiloxane fibre for the determination of target analytes was carried out. Single-walled carbon nanotubes fibre showed higher extraction capacity, better thermal stability (over350∘C), and longer lifespan (over 250 times) than the commercial polydimethylsiloxane fibre. The developed method was successfully applied to determine target organophosphorus pesticides in real samples.

Using Single-Walled Carbon Nanotubes as Solid-Phase Extraction Adsorbent for the Sensitive Determination of Amino Acid Neurotransmitters in Human Cerebrospinal Fluids

2010 ◽  
Vol 159 ◽  
pp. 622-627
Author(s):  
Xiao Ling Zhang ◽  
Qiao Yang
Keyword(s):  
Carbon Nanotubes ◽  
Amino Acid ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Single Walled Carbon Nanotubes ◽  
Phase Extraction ◽  
Amino Acid Neurotransmitters ◽  
Walled Carbon Nanotubes ◽  
As Solid Phase

Carbon nanotubes are a kind of new carbon-based nanomaterials, which have drawn great attention in many application fields including the biomarker analysis in biomedical and clinical research. In the present study, the feasibility of single-walled carbon nanotubes (SWCNTs) as solid-phase extraction (SPE) adsorbent for the determination of amino acid neurotransmitters (AANs) (glutamic, dopamine and γ-amino-n-butyric acid) in human cerebrospinal fluids (CSFs) was investigated. Various parameters affecting SPE efficiency including the eluent and its volume, adsorbent amount and sample volume were systematically studied. The acquired calibration curves were linear (r2 > 0.999) over the concentration range 10 to 500 ng per injection. By using SWCNTs as the SPE adsorbent, the detection limit of 12.9-42.5 fmol (at S/N of 3) were achieved with the preconcentration efficiency of more than 500-folds. The feasibility of the proposed method was validated by successfully applied to the measurements of ANNs in human CSFs sampled from healthy subjects and the patients with human immunodeficiency virus (HIV) infection, malignant melanoma and hypertension. This original application represents a powerful tool to study the kinetics of ANNs release by neuronal cells during neurotransmission, as well as for the understanding of the pathobiological and therapeutic basis of these remarkable molecular for diverse diseases.

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