MnFe2O4@CNT-N as novel electrochemical nanosensor for determination of caffeine, acetaminophen and ascorbic acid

Abstract

Automated synthesis of [ 18 F]ciprofloxacin in a TRACERlab TM FX FDG (GE Healthcare) synthesis module was developed. Dependence of radiochemical yield on reactor type was observed. 3-mL V-shaped borosilicate glass reactor gave higher radiochemical yield as compared with standard 15-mL glassy carbon reactor. V-shaped borosilicate glass reactor might also give higher radiochemical yield for other [ 18 F]radiotracers than [ 18 F]ciprofloxacin. a b s t r a c tWe transferred the previously published manual synthesis of [ 18 F]ciprofloxacin (decay-corrected RCY: 5.5 71.0%) to an automated synthesis module (TRACERlab TM FX FDG , GE Healthcare) and observed a strong decrease in RCY (0.4 70.4%). When replacing the standard 15-mL glassy carbon reactor of the synthesis module with a 3-mL V-shaped borosilicate glass reactor a considerable improvement in RCY was observed. [ 18 F]Ciprofloxacin was obtained in a RCY of 2.7 71.4% (n ¼23) with a specific activity at EOS of 1.47 0.5 GBq/mmol in a synthesis time of 160 min.

Highly selective differential pulse voltammetric determination of warfarin in pharmaceutical and biological samples using MnFe2O4/MWCNT modified carbon paste electrode

“…2 excellent magnetic property, high electronic conductivity, high thermal stability, and effective catalytic activity [1][2]. As a new form of carbon material, Carbon nanotubes (CNT) are among the best candidates for the preparation of electrocatalytic nanocomposite materials [3].…”

Adsorptive stripping voltammetric method for the determination of caffeine at integrated three-electrode screen-printed sensor with carbon/carbon nanofibers working electrode

“…Many different electrochemical methods can be found in the subject literature, that apply working electrodes with surfaces that have been subjected to various modification processes to improve their analytical properties. These include using glassy carbon electrodes modified with: Nafion (Torres et al 2014), Nafion and graphene oxide (Zhao et al 2011), lead and Nafion films (Tyszczuk-Rotko and Bęczkowska 2015), multiwall carbon nanotubes (Gupta et al 2013), a composite film of poly(4-vinylpyridine) and multiwall carbon nanotubes (Ghadimi et al 2016), a DNA-functionalized single walled carbon nanotube and Nafion composite film (Wang et al 2014), novel N-doped carbon nanotubes functionalized with MnFe 2 O 4 nanoparticles (Fernandes et al 2015). Also electrode modified through the electrodeposition of luteolin on a functionalized multi-wall carbon nanotube immobilized on the surface of a glassy carbon electrode (Amiri-Aref et al 2014) or a glassy carbon disk electrodes after its modification with poly(Alizarin Violet 3B), multiwalled carbon nanotubes and graphene (Wang et al 2016) were used for the determination of caffeine.…”

“…Currently, nanocarbon materials attract growing interest in analytical chemistry due to their unique properties and structures (Fernandes et al 2015). Nanomaterials have been widely used as chemical sensor and biosensor materials (Zhao et al 2011).…”

Paper‐based Electrochemical Devices Coupled to External Graphene‐Cu Nanoparticles Modified Solid Electrode through Meniscus Configuration and their Use in Biological Analysis

“…These two substances are broadly present in several medications easily acquired without prescription. Overdoses of these compounds may cause the accumulation of toxic metabolites and lead to hepatotoxicity and nephrotoxicity, which makes the control of their levels an important topic .…”