Molecularly imprinted polymer grafted graphene for simultaneous electrochemical sensing of 4, 4-methylene diphenylamine and aniline by differential pulse voltammetry

Chen, Ningning; Chen, Li; Cheng, Yuxiao; Zhao, Kai; Wu, Xiaohong; Xian, Yuezhong

doi:10.1016/j.talanta.2014.09.008

Cited by 43 publications

(16 citation statements)

References 49 publications

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“…This step appears in the DTG diagram as a shoulder or a small semi-convoluted peak. The second thermal degradation step, situated in the interval 375-650°C, is common to all systems and represents the acrylonitrile aromatization and graphitization [9][10][11][12][13][14]. The imprinted polymer is the most thermally sensitive, meaning that sclareol, similar to diosgenin, is the one which is firstly decomposing (with a maximum at 112.7°C).…”

Section: Tg and Dtg Analyses Of Mips And Nipsmentioning

confidence: 99%

“…Among these types of analyses, an important role is represented by thermal analysis. The thermal methods most often used for MIP characterization are the thermogravimetric analysis (TG), sometimes coupled with mass spectrometry (MS) or Fourier transform infrared spectroscopy (FT-IR), the differential scanning calorimetry (DSC), pyrolysis, and dynamic mechanical thermal analysis (DMTA) [7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Thermal analyses as tools for proving the molecular imprinting with diosgenin and sclareol in acrylic copolymer matrices

Dima

Nicolae

Iordache

et al. 2015

J Therm Anal Calorim

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Thermogravimetric analysis (TG), derivative thermogravimetry (DTG), differential scanning calorimetry (DSC), dynamic mechanical thermal analysis, simultaneous differential thermogravimetry (SDT) coupled with mass spectrometry (MS), and pyrolysis coupled with gas chromatography/mass spectrometry (Py-GC/MS) were used to characterize molecularly imprinted polymers (MIPs) obtained with two anti-cancerous template molecules, diosgenin and sclareol, imprinted in acrylonitrileacrylic acid copolymer matrices. First of all, TG analyses revealed a specific mass loss in the temperature range 220-300°C characteristic to diosgenin-MIPs, while for the sclareol-MIPs, the specific interval was 100-240°C. Further, the DSC analyses evidenced two major aspects: first, that the copolymer matrices have a single glass transition temperature (T g ), which confirms the random statistic copolymer structure, an essential characteristic of a homogenous MIP matrix; secondly, both templates influence the T g values of the MIPs, fact that is an additional proof of molecular imprinting. The SDT results confirmed the TG and DSC results and, additionally, proved that the system with higher acrylic acid content generates stronger template-matrix interactions via hydrogen, van der Waals, and other non-covalent forces, fact that appears as an increased thermal stability on the TG curve and a higher maximum for template decomposition on the DTG curve. The MS results evidenced that a single mass fragment, 139 ± 1 m/z, characteristic for the class of steroid sapogenines of which diosgenin belongs, is enough to prove, qualitatively and quantitatively, the molecular imprinting and the template elution. As global conclusion, the applied thermal analyses proved to be exceptional tools for analyzing these molecularly imprinted polymers.

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Section: Tg and Dtg Analyses Of Mips And Nipsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal analyses as tools for proving the molecular imprinting with diosgenin and sclareol in acrylic copolymer matrices

Dima

Nicolae

Iordache

et al. 2015

J Therm Anal Calorim

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“…For achieving a selective detection of PAAs, other analytical techniques have been proposed as alternatives to the spectrophotometric method. Among others, chromatography (Cai, Ge, Ouyang, Hu, & Li, 2020), mass spectrometry (Sanchis, Coscollà, & Yusà, 2019), capillary electrophoresis (Mattarozzi, Lambertini, Suman, & Careri, 2013), and electrochemical methods (Chen et al, 2015) proved to be effective for the detection of trace amounts of PAAs transferred from the packaging material. However, also the above methods have drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Development of a nano-modified glassy carbon electrode for the determination of 2,6-diaminotoluene (TDA)

Büyüktaş

Ghaani

Rovera

et al. 2021

Food Packaging and Shelf Life

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The objective of this study was to improve the overall performance of a glassy carbon electrode (GCE) for the detection of 2,6-diaminotoluene (TDA), a possibly carcinogenic primary aromatic amines (PAAs) that poses a serious risk for the consumer' health because they can transfer from multilayer food packages including adhesives based on aromatic polyurethane (PU) systems, to the food. The modification of the electrode surface was made by means of multi-walled carbon nanotubes (MWCNTs) and mesoporous carbon nanoparticles (MCNs).The MWCNTs-MCNs/GCE allowed achieving the best performance in terms of sensitivity, as revealed by cyclic voltammetry -CV, with an oxidation peak of 20.95 µA over 0.079 µA of the bare GCE. The pH of the medium influenced the oxidation of 2,6-TDA, with highest sensitivity at pH ~7. Amperometry experiments led to an estimated detection limit of 0.129 µM, and three linear ranges were obtained for 2,6-TDA: 0. 53-11.37 μM, 11.37-229.36 μM, and 229.36-2326.60 µM. Chronoamperometry experiments combined with Cottrell's theory allowed estimating a diffusion coefficient of 2,6-TDA of 1.34×10 −4 cm 2 s −1 . The number of electrons (n~1) involved in the catalytic oxidation of 2,6-TDA was determined according to the Laviron's theory. Real sample tests demonstrated that the modification of the sensor using nanoparticls allowed to obtain a highly sensitive and selective sensor, which can possibly used as an alternative analytical device for the rapid, easy, and reliable determination of 2,6-TDA.

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“…Aniline, the most typical compound in aromatic amines, is a kind of colorless oily liquid with sweet smelling. Aniline is an important raw material and intermediate for organic chemistry [1], which is widely used in some industries such as pesticide [2], medicine [3], oil paint, dyes [4], plastic [5], military, and defense products [6]. Aniline is detrimental to both environment and human's health.…”

Section: Introductionmentioning

confidence: 99%

Degradation Characteristics of Aniline with Ozonation and Subsequent Treatment Analysis

Jing

Cao

et al. 2015

Journal of Chemistry

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Owing to the toxicity and low biodegradability of aniline in water, its removal usually needs high cost processes such as adsorption and advanced oxidation. The degradation characteristics of aniline during ozonation were studied. The influence of operation parameters such as contact time, initial concentration, ozone dosage, temperature, and pH was also investigated. With ozone dosage of 22 mg/L, neutral pH, and room temperature, the ozonation removed aniline efficiently. After two hours’ ozonation, aniline removal reached 93.57%, and the corresponding COD removal was 31.03%, which indicated most of aniline was transformed into intermediates. At alkaline conditions, the aniline was more susceptible to being removed by ozonation owing to more hydroxyl radicals’ production. The results of GC-MS indicated many intermediates appeared during the process of ozonation such as butane diacid, oxalic acid, and formic acid. The intermediates produced during ozonation were more biodegradable than aniline; thus the ozonation of such organic compounds as aniline could be integrated with biological processes for further removal.

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Molecularly imprinted polymer grafted graphene for simultaneous electrochemical sensing of 4, 4-methylene diphenylamine and aniline by differential pulse voltammetry

Cited by 43 publications

References 49 publications

Thermal analyses as tools for proving the molecular imprinting with diosgenin and sclareol in acrylic copolymer matrices

Thermal analyses as tools for proving the molecular imprinting with diosgenin and sclareol in acrylic copolymer matrices

Development of a nano-modified glassy carbon electrode for the determination of 2,6-diaminotoluene (TDA)

Degradation Characteristics of Aniline with Ozonation and Subsequent Treatment Analysis

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