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Solid phase extraction

Christine M Batikian, Ally Lu, Kayo Watanabe, Jerome Pitt, Richard M Gersberg
Imidacloprid is a widely used insecticide with high runoff potential posing a significant threat to aquatic ecosystems. In order to determine the spatial and temporal concentrations of imidacloprid in Forester Creek, a tributary to the San Diego River, surface water samples were collected from two sites under wet-weather and dry-weather conditions. Solid phase extraction and liquid chromatography tandem mass spectrometry were utilized to quantify imidacloprid levels in all samples. Imidacloprid was detected with 100% frequency in surface water samples from Forester Creek with a median concentration of 16...
February 2, 2019: Chemosphere
Najmeh Yazdanfar, Mojtaba Shamsipur, Mahnaz Ghambarian
A highly sensitive new method is described for performing dispersive microextractions. It is making use of a magnetic carbon nanocomposite and two miscible organic solvents. The method was applied to simultaneous extraction of 32 polychlorinated biphenyls (PCBs) prior to their quantitation by gas chromatography with electron capture detection. The effects of pH value of sample for both micro solid phase extraction and dispersive liquid-liquid microextraction, of the amount of sorbent, extraction time, type and volume of the miscible organic solvents and of salt addition were optimized...
February 15, 2019: Mikrochimica Acta
Chaoran Liu, Xinya Liu, Philip J Marriott, Heng Qian, Zilin Meng, Zhirong Yang, Runhua Lu, Haixiang Gao, Wenfeng Zhou
In this work, a method for the analysis of benzoylurea insecticides, including hexaflumuron, flufenoxuron, lufenuron and chlorfluazuron, in tea samples by HPLC with Fe3 O4 - hyperbranched polyester nanocomposite as the adsorbent for magnetic solid-phase extraction was developed. The magnetic nanocomposite was prepared and characterized by infrared spectroscopy, vibrating sample magnetometry and scanning electron microscopy. The as-prepared nanocomposite was used as the sorbent for extraction and preconcentration of pesticide residues in tea samples...
February 15, 2019: Journal of Separation Science
Barbara Sgorbini, Cecilia Cagliero, Stefano Acquadro, Arianna Marengo, Chiara Cordero, Erica Liberto, Carlo Bicchi, Patrizia Rubiolo
A correct botanical identification and analytical quality control of volatile key-markers responsible for aroma and biological activities is necessary to monitor volatile compounds transferred from a plant to the related herbal tea and human intake to guarantee their safe use. This is mainly true for markers limited by regulations or by a recommended maximum amount of consumption per day. GC-MS is the elective technique to analyze volatiles, provided that for aqueous samples (herbal teas) an appropriate sample preparation procedure, and/or a water-compatible GC stationary phases are applied...
February 6, 2019: Journal of Chromatography. A
Providencia González-Hernández, Ana B Lago, Jorge Pasán, Catalina Ruiz-Pérez, Juan H Ayala, Ana M Afonso, Verónica Pino
The pillared-layer Zn-triazolate metal-organic framework (CIM-81) was synthesized, characterized, and used for the first time as a sorbent in a dispersive micro-solid phase extraction method. The method involves the determination of a variety of personal care products in wastewaters, including four preservatives, four UV-filters, and one disinfectant, in combination with ultra-high performance liquid chromatography and UV detection. The CIM-81 MOF, constructed with an interesting mixed-ligand synthetic strategy, demonstrated a better extraction performance than other widely used MOFs in D-µSPE such as UiO-66, HKUST-1, and MIL-53(Al)...
February 15, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Arezou Taghvimi, Ahad Bavili Tabrizi, Siavoush Dastmalchi, Yousef Javadzadeh
Carboxylated carbon porous adsorbent was derived from zeolite imidazole framework (ZIF-8) via carbonization of ZIF-8 under a nitrogen atmosphere. The synthesized carboxylated adsorbent was fully characterized by various techniques including Fourier transform spectroscopy (FTIR), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and zeta potential analysis. The carboxylated adsorbent was applied as dispersive solid phase extraction (DSPE) adsorbent for efficient extraction of methamphetamine (MET) from biological urine samples...
February 7, 2019: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Marissa J Finkelstein, Chris W Chronister, Christina Stanley, Laurie M Ogilvie, Bruce A Goldberger
In 2013, the Centers for Disease Control and Prevention released a warning regarding a new recreational drug, acetyl fentanyl. Acetyl fentanyl is a μ-opioid receptor agonist, and its pharmacological effects include euphoria, altered mood, miosis and central nervous system depression. The objective of this report was to develop a sensitive and specific method for the quantitation of acetyl fentanyl by gas chromatography-mass spectrometry in postmortem casework. Acetyl fentanyl was isolated from biological matrices using solid-phase extraction and acetyl fentanyl-13C6 was employed as an internal standard...
February 15, 2019: Journal of Analytical Toxicology
Bo Jin, Yanan Wang, Tingting Zhang, Wanting Yin, Dongfeng Zhang, Haihong Huang, Chen Ma
SY0916 has been proven to be a potent treatment agent against rheumatoid arthritis in preclinical studies and has been shown to be safe in phase I clinical trials. However, SY0916 is unstable in water, which is frequently used in pharmaceutical development processes. The degradation behaviour and stability of SY0916 in aqueous solutions were investigated at different pH levels, periods of time, and temperatures. Two degradation products (DPs) were successfully separated and characterized by liquid chromatography coupled to high-resolution tandem mass spectrometry (LC-HRMS/MS), liquid chromatography coupled to nuclear magnetic resonance with solid phase extraction (LC-SPE-NMR), and nuclear magnetic resonance (NMR)...
2019: Journal of Analytical Methods in Chemistry
Habibeh Gholami, Maryam Arabi, Mehrorang Ghaedi, Abbas Ostovan, Ahmad Reza Bagheri
This paper reports a new variant of sample clean-up procedure based on miniaturized matrix solid phase dispersion (MSPD) combining with water compatible magnetic molecularly imprinted polymers (MMIP) for preconcentration of melamine from milk samples prior high-performance liquid chromatography with UV detection. By employing MMIP as dispersant sorbent matrix interferences could be eliminated completely and the column packing step was interestingly omitted that decreasing in glassware expenditure, labor effort and extraction time which cause improvement of the method performance...
February 7, 2019: Journal of Chromatography. A
Rui Xiao, Siqi Wang, Mohammed Hassan Ibrahim, Hassan Idris Abdu, Duoliang Shan, Jing Chen, Xiaoquan Lu
Recently, water pollution caused by antibiotics is rapidly increasing. Thus, developing efficient, fast and sensitive detection methods for environmental antibiotics monitoring are still remaining elusive. Herein, a method for antibiotics analysis including lecofloxacin, pazcofloxacin and gatifloxacin in water by high performance liquid chromatography (HPLC) using molybdenum disulfide-graphene oxide-supported magnetic nanoparticles (Fe3 O4 /GO/MoS2 ) as the adsorbent of magnetic solid-phase extraction was developed...
February 8, 2019: Journal of Chromatography. A
Varvara Sygouni, Alexis G Pantziaros, Iakovos C Iakovides, Evangelia Sfetsa, Polychronia I Bogdou, Emilia A Christoforou, Christakis A Paraskeva
The semi-solid wastes (pomace or alperujo) produced in the two-phase olive oil extraction process contains extremely high organic load and phenolic substances. Efficient treatment of such kinds of wastes using membrane filtration, should be sought to reduce the hazardous effects to the environment. On the other hand, phenolic compounds can be isolated and purified up to a level of commercial exploitation using the membrane technology. Firstly, the extraction process with mixtures of water and ethanol was optimized by testing extraction parameters (e...
February 5, 2019: Membranes
Francesca Blasi, Luna Pollini, Lina Cossignani
In recent years, there is an increasing interest in high-quality extra virgin olive oils (EVOOs) produced from local cultivars. They have particular chemical/organoleptic characteristics and are frequently subjected to fraud, whereby the control of quality requires a powerful varietal check. In the present research, triacylglycerols (TAGs) and volatiles have been studied as chemical markers for the authentication of EVOO samples from four Italian varieties of Olea europea (Dolce Agogia, Frantoio, Leccino, and Moraiolo)...
February 5, 2019: Foods (Basel, Switzerland)
Pavlo Bohutskyi, Duc Phan, Ruth E Spierling, Anatoliy M Kopachevsky, Edward J Bouwer, Trygve J Lundquist, Michael J Betenbaugh
The feasibility of generating a lipid-containing algal-bacterial polyculture biomass in municipal primary wastewater and enhancing biomethanation of lipid-extracted algal residues (LEA) through hydrothermal pretreatment and co-digestion with sewage sludge (SS) was investigated. In high-rate algal ponds, the polyculture of native algal and bacteria species demonstrated a monthly average net and gross biomass productivity of 30 ± 3 and 36 ± 3 gAFDW m-2 day-1 (summer season). The algal community was dominated by Micractinium sp...
February 25, 2019: Science of the Total Environment
Zhongshan Liu, Ping Jiang, Guang Huang, Xiaowen Yan, Xing-Fang Li
We report a new material of a composite silica monolith nested in sponge (SiMNS) and demonstrate an application in the trace analysis of environmental contaminants in water. SiMNS is prepared through sponge absorption of a hydrolyzed mixture of siloxanes and in situ gel formation within the pores. Images obtained using scanning electron microscopy show that the silica and sponge skeletons are mutually nested in SiMNS. This nested composite structure of SiMNS enhances the mechanical flexibility of the material, allowing for reproducible production of desirable sizes and shapes for solid phase extraction (SPE) cartridges without the need to use frits...
February 13, 2019: Analytical Chemistry
Parezhati Pataer, Turghun Muhammad, Yunusjan Turahun, Wenwu Yang, Sailemayi Aihebaier, Muyasier Wubulikasimu, Lingxin Chen
This paper describes a stoichiometric approach to synthesis molecularly imprinted polymers specific for auramine O. Using the stoichiometric interaction in molecular imprinting no excess of binding sites is necessary and binding sites are only located inside the imprinted cavities. The free base of template was obtained to facilitate the interaction with the monomers. Itaconic acid was selected as functional monomer and stoichiometric ratio of the interaction with the free base was investigated. The molecularly imprinted polymers preparation conditions such as cross-linker, molar ratio, porogen were optimized to be divinylbenzene, 1:2:20 and chloroform/N,N-dimethylformamide, respectively...
February 13, 2019: Journal of Separation Science
Mohammad H Semreen, Abdallah Shanableh, Lucy Semerjian, Hasan Alniss, Mouath Mousa, Xuelian Bai, Kumud Acharya
The present work describes the optimization and validation of a highly selective and sensitive analytical method using solid phase extraction and liquid chromatography tandem mass spectrometry (SPE LC-MS/MS) for the determination of some frequently prescribed pharmaceuticals in urban wastewater received and treated by Sharjah sewage treatment plant (STP). The extraction efficiency of different SPE cartridges was tested and the simultaneous extraction of pharmaceuticals was successfully accomplished using hydrophilic-lipophilic-balanced reversed phase Waters® Oasis HLB cartridge (200 mg/ 6 mL) at pH 3...
February 11, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Jeroen Roosendaal, Kai Wang, Hilde Rosing, Luc Lucas, Abadi Gebretensae, Aram Oganesian, Jan H M Schellens, Jos H Beijnen, Zhongping John Lin
Guadecitabine (SGI-110), a dinucleotide of β‑decitabine and deoxyguanosine, is currently being evaluated in phase II/III clinical trials for the treatment of hematological malignancies and solid tumors. This article describes the development and validation of bioanalytical assays to quantify guadecitabine and its active metabolite β‑decitabine in human plasma, whole blood and urine using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). Since β‑decitabine is rapidly metabolized further by cytidine deaminase, plasma and whole blood samples were kept on ice-water after collection and stabilized with tetrahydrouridine (THU) directly upon sample collection...
January 22, 2019: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Luciano Molognoni, Jacson Nascimento Dos Santos, Cristian Rafael Kleemann, Ana Carolina Oliveira Costa, Rodrigo Barcellos Hoff, Heitor Daguer
A fast, low-expensive analytical, highly metrologic reliability approach was developed to assist an official program for 21 marine biotoxins monitoring in bivalve mollusks. The simultaneous analysis of lipophilic and hydrophilic marine biotoxins was achieved using a sample preparation protocol based on solid-liquid extraction and low-temperature clean up followed by liquid chromatography-tandem mass spectrometry. Samples were extracted with acidified methanol: water (90:10) followed by low-temperature clean up...
February 12, 2019: Journal of Agricultural and Food Chemistry
Yulei Cui, Yun Shao, Qilan Wang, Lijuan Mei, Yanduo Tao
Herbal plants are significant for the reason that they have a great potential in discovering drug precursors. However, how to purify compounds with higher purity from them is a question which needs to be discussed. In present study, an offline 2D reversed-phase (RP) preparative liquid chromatography coupled with solid-phase extraction (SPE) method was successfully developed for the separation of flavonolignan diastereoisomers from Arenaria kansuensis. Based on the analysis of results, the major conclusion that we have drawn from it is a RP-SPE was selected for enriching target flavonolignan sample from A...
February 7, 2019: Journal of Chromatographic Science
Edilma Sanabria Español, Mauricio Maldonado
This article is based on a review of the literature and our own experience with toxicological molecules. We explain the nature of calix[n]arenes and as their recognized properties are used to detect compounds of toxicological interest, mainly the most important pesticide families such as organophosphorated, organochlorine compounds, pyrethroid insecticides, carbamate fungicides, and herbicides, using different techniques. In addition, we show the role of the macrocycle and its interactions, and the advantage of using this type of compound for improving conventional techniques, where the phenomenon of recognition is very important, such as chromatography, solid-phased extraction, and the development of specific sensors, among others and Even we also show the use of this macrocycle for detoxication procedures in vivo...
February 12, 2019: Critical Reviews in Analytical Chemistry
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