Ultrasound assisted dispersive solid-phase extraction coupled with high-performance liquid chromatography-diode array detector for determination of caffeine and carbamazepine in environmental samples using exfoliated graphite/chitosan hydrogel

Mpayipheli, Neliswa; Mpupa, Anele; Nomngongo, Philiswa N.

doi:10.1007/s11696-022-02328-4

Cited by 4 publications

(1 citation statement)

References 47 publications

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“…45 One study indicated that in WWTPs located in KwaZulu-Natal, carbamazepine concentrations did not exceed the method quantitation limit of 2.9 µg L −1 , 46 while there was no detection in Daspoort WWTP (Pretoria, Gauteng). 64,90 However, a different scenario was presented in the same province indicating high levels of this drug in both influents and effluents of five WWTPs (Northern, Umbilo, Umhlathuzana, Amanzimtoti and Darvill) located in KwaZulu-Natal. 77 All the influent samples contained carbamazepine with the highest concentration of 24 µg L −1 found in Darvill WWTP.…”

Section: Carbamazepinementioning

confidence: 99%

A journey of 10 years in analytical method development and environmental monitoring of pharmaceuticals in South African waters

Madikizela

2023

S.Afr.j.chem.

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Apart from the studies which reported the occurrence of steroid hormones and antibiotics in wastewater treatment plants (WWTPs) back in 2004, 2007 and 2012, the evidence for monitoring of pharmaceuticals in South African water bodies intensified from 2014. Therefore, this study reviewed the analytical methods developed and applied in South Africa for the purpose of monitoring pharmaceuticals and their metabolites in water. At the same time, pharmaceuticals and their metabolites detected in South African waters are reviewed. To date, there is over 100 pharmaceuticals detected in South African waters with most studies focussing on quantitative analysis of non-steroidal anti-inflammatory drugs (NSAID), antibiotics, antiretroviral drugs and carbamazepine. Various sources of pharmaceuticals in the environment are reported, with WWTPs found as the major contributor to their occurrence in South African rivers. Notably, a NSAID, ibuprofen, with concentrations found exceeding 100 μg L-1 in selected WWTPs has also been found at high levels reaching 60 μg L-1 in river water. Mostly, pharmaceuticals detected in wastewater are also reported in corresponding rivers. The present review details pharmaceuticals that should be included in environmental monitoring studies performed in South Africa, while also identifying areas for future research through the research gap analysis.

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Section: Carbamazepinementioning

confidence: 99%

A journey of 10 years in analytical method development and environmental monitoring of pharmaceuticals in South African waters

Madikizela

2023

S.Afr.j.chem.

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Microgels based on thermo‐responsive poly(N‐isopropylacrylamide) as sorbent of bisphenol A and parabens in water

Leite,

Sampaio,

de Oliveira

et al. 2024

Journal of Polymer Science

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Smart microgels can be used as sorbents, possessing high surface area and rapid stimuli‐responsiveness. A series of poly(N‐isopropylacrylamide) (pNIPAM) and pNIPAM‐co‐starch nanoparticles (pNIPAM‐co‐SNPs) thermo‐responsive microgels were synthesized, presenting different hydrophilic/hydrophobic behavior according to the composition. The adsorption studies were carried out for methylparaben (MPB), ethylparaben (EPB), propylparaben (PPB), butylparaben (BPB), and bisphenol A (BPA), and the extraction and desorption efficiency were determined by high‐performance liquid chromatography and spectrophotometric detection (HPLC‐UV). The effect of microgel phase transition according to the temperature and the copolymerization with SNPs in each sorptive step was investigated. The extraction of less polar compounds (BPA, PPB, and BPB) above the volume phase transition temperature (VPTT) was favored, driven by a predominant hydrophobic interaction. According to microgel composition, the desorption capacity as a function of temperature can be influenced by hydrophilic interactions and water competition. Molecular dynamics (MD) simulations and binding free energy calculations were performed to provide theoretical evidence about binding energies between pNIPAM and BPA, which experimentally showed the best extraction efficiency results. These findings may provide a strategy for designing high‐performance sorptive phases that could remove hydrophilic and hydrophobic compounds from water and a hypothesis about the driving forces of such processes.

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Green nanomaterials in extraction techniques

Bagheri,

Zhou,

Liu

et al. 2024

Applications of Green Nanomaterials in Analytical Chemistry

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Ultrasound assisted dispersive solid-phase extraction coupled with high-performance liquid chromatography-diode array detector for determination of caffeine and carbamazepine in environmental samples using exfoliated graphite/chitosan hydrogel

Cited by 4 publications

References 47 publications

A journey of 10 years in analytical method development and environmental monitoring of pharmaceuticals in South African waters

A journey of 10 years in analytical method development and environmental monitoring of pharmaceuticals in South African waters

Microgels based on thermo‐responsive poly(N‐isopropylacrylamide) as sorbent of bisphenol A and parabens in water

Green nanomaterials in extraction techniques

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