Preconcentration and Determination of Naproxen in Water Samples by Functionalized Multi-Walled Carbon Nanotubes Hollow Fiber Solid Phase Microextraction–HPLC

2016 ◽  
Vol 71 (7) ◽  
pp. 675-680
Author(s):  
Hossein Akhlaghi ◽  
Mahdi Ghorbani ◽  
Nahid Afshar Lahoori ◽  
Alireza Shams
Keyword(s):  
Carbon Nanotubes ◽  
Hollow Fiber ◽  
Water Samples ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

CoFe2O4-MWCNTs Modified Screen Printed Carbon Electrode Coupled with Magnetic CoFe2O4-MWCNTs Based Solid Phase Microextraction for the detection of Bisphenol A

2018 ◽  
Vol 14 (3) ◽  
pp. 199-208 ◽  
Author(s):  
Asiye Aslihan Avan ◽  
Hayati Filik
Keyword(s):  
Carbon Nanotubes ◽  
Detection Limit ◽  
Bisphenol A ◽  
Water Samples ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Endocrine Disrupting ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Background: Bisphenol A (BPA) is an important intermediate in the industrial manufacturing of either polycarbonate plastic or epoxy resins. Bisphenol A and its chemical derivatives are endocrine-disrupting chemicals. BPA is a potent endocrine-disrupting compound (EDC) and its toxicity is widely reported in the literature. Therefore, it is important to develop fast identification methods for the monitoring of BPA in the environment. Methods: In this work, multi-walled carbon nanotubes decorated with cobalt ferrites (CoF) nanoparticles were synthesized by a controlled co-precipitation reaction. The modified multi-walled carbon nanotubes decorated with CoF nanoparticles were applied as a magnetic solid-phase microextraction (M-SPME) sorbent for the extraction of trace levels of BPA from water samples. In detection step, the CoF/MWCNTs modified screen-printed carbon electrodes (CoF/MWCNTs/SPCEs) (named CoFsensor) were used for the electrochemical detection of BPA. The CoF/MWCNTs modified SPCEs are found to give stable and reproducibility responses to BPA and the sensor exhibited good stability. Finally, the established combined procedure was successfully applied to determine BPA in water samples. Results: In this work, the magnetic CoFe2O4/MWCNTs nanoparticles were used as the electrode modifier and sample pre-concentrator. Firstly, some important electrochemical parameters of the modified electrodes were optimized and the calibration curve of the sensor showed a good linearity in the range of 0.5-50 µM and the detection limit was 0.2 µM. Secondly, the important parameters that affect the extraction performance were optimized. Under combined conditions, the calibration graph for the determination of bisphenol A was linear in the range of 0.02-1.5 µM (4.56-342 µg/L) and the detection limit was 0.01 µM. Finally, the combined system was successfully used for the detection of bisphenol A in tap water, drinking water, mineral water with recoveries of 93-102%. Conclusion: A new determination system combined CoF-sensor with M-CoF-SPME was developed for rapid, sensitive and selective detection of traces BPA in aqueous samples. The CoF/MWCNTs exhibited high sensitivity toward BPA with a maximum adsorption capacity of 67.7 mg/g. The nanoparticles were collected using a magnet and reused at least 10 times without substantial degradation in the activity. The analytical method combined miniaturised systems both in sample preparation and in detection stage, with the major advantage of avoiding costly and bulky or unmovable instrumentation. Besides, the M-CoF-SPME-CoF-sensor combination detection system provided many benefits such as cheapness, ease of operation, good sensitivity and repeatability. The determination method developed in current study provides a new option for the determination of BPA in water sample.

Multi-walled carbon nanotubes-agarose gel micro-solid phase extraction for the determination of triazine herbicides in water samples

2015 ◽  
Vol 7 (6) ◽  
pp. 2862-2868 ◽  
Author(s):  
Mohd Marsin Sanagi ◽  
Mohamad Nazirul Muzakkir Mat Jais ◽  
Sazlinda Kamaruzaman ◽  
Wan Aini Wan Ibrahim ◽  
Umair Baig
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Agarose Gel ◽  
Phase Extraction ◽  
Triazine Herbicides ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

A new extraction procedure termed multi-walled carbon nanotubes-agarose gel micro-solid phase extraction (MWCNTs-AG-μSPE) combined with GC-MS was used for the determination of triazine herbicides in water samples.

Sensitive magnetic solid-phase microextraction based on oxide multi-walled carbon-nanotubes for the determination of methylamphetamine and ketamine in human urine and blood

2015 ◽  
Vol 7 (10) ◽  
pp. 4209-4215 ◽  
Author(s):  
Suling Zhang ◽  
Yanhua Cui ◽  
Jiancong Sun ◽  
Yongqing Xi ◽  
Chunxiao Zhang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Carbon Nanotubes ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Gas Chromatography Mass Spectrometry ◽  
Basic Drugs ◽  
Multi Walled Carbon Nanotubes ◽  
Magnetic Solid ◽  
Walled Carbon Nanotubes

A solid-phase microextraction (MSPE) procedure, combined with gas chromatography-mass spectrometry (GC-MS), was developed for the quantification of two illegal basic drugs in biological samples.

Multi-walled Carbon Nanotubes Reinforced into Hollow Fiber by Chitosan Sol-gel for Solid/Liquid Phase Microextraction of NSAIDs from Urine Prior to HPLC-DAD Analysis

2019 ◽  
Vol 20 (5) ◽  
pp. 390-400 ◽  
Author(s):  
Nabil N. AL-Hashimi ◽  
Amjad H. El-Sheikh ◽  
Rania F. Qawariq ◽  
Majed H. Shtaiwi ◽  
Rowan AlEjielat
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Phase ◽  
Hollow Fiber ◽  
Sol Gel ◽  
Liquid Phase Microextraction ◽  
Extraction Device ◽  
Multi Walled Carbon Nanotubes ◽  
Solid Liquid ◽  
Walled Carbon Nanotubes

Background: The efficient analytical method for the analysis of nonsteroidal antiinflammatory drugs (NSAIDs) in a biological fluid is important for determining the toxicological aspects of such long-term used therapies. Methods: In the present work, multi-walled carbon nanotubes reinforced into a hollow fiber by chitosan sol-gel assisted-solid/ liquid phase microextraction (MWCNTs-HF-CA-SPME) method followed by the high-performance liquid chromatography-diode array detection (HPLC–DAD) was developed for the determination of three NSAIDs, ketoprofen, diclofenac, and ibuprofen in human urine samples. MWCNTs with various dimensions were characterized by various analytical techniques. The extraction device was prepared by immobilizing the MWCNTs in the pores of 2.5 cm microtube via chitosan sol-gel assisted technology while the lumen of the microtube was filled with few microliters of 1-octanol with two ends sealed. The extraction device was operated by direct immersion in the sample solution. Results: The main factors influencing the extraction efficiency of the selected NSAIDs have been examined. The method showed good linearity R2 ≥ 0.997 with RSDs from 1.1 to 12.3%. The limits of detection (LODs) were 2.633, 2.035 and 2.386 µg L-1, for ketoprofen, diclofenac, and ibuprofen, respectively. The developed method demonstrated a satisfactory result for the determination of selected drugs in patient urine samples and comparable results against reference methods. Conclusion: The method is simple, sensitive and can be considered as an alternative for clinical laboratory analysis of selected drugs.

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