Preparation and Characterization of a Novel Solid-Phase Microextraction Material for Application to the Determination of Pesticides

2016-05-02
Dizdas, Tugberk Nail
Pelit, Fusun Okcu
KORBA, KORCAN
PELİT, LEVENT
Kanik, Fulya Ekiz
Toppare, Levent Kamil
ERTAŞ, HASAN
ERTAŞ, FATMA NİL
Show full item record
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
199
views
0
downloads
The preparation and characterization of a novel solid-phase microextraction fiber is reported with application to the determination of pesticides in fruit juice. The fiber was fabricated by electrochemically coating a stainless steel wire with a thin polymeric film of 4-(2,5-di(thiophen-2-yl)-1H-pyrrol-1-yl) benzenamine. The procedure was initiated in 10mL of acetonitrile containing 5.5mg of monomer, 0.1mol NaClO4, and 0.1mol LiClO4 by cycling the potential between -0.5 and 1.2V with a scan rate of 100mV/sec. The morphology of the fiber surface was examined by scanning electron microscopy and its stability was characterized by thermal gravimetric analysis. The fiber was exposed to headspace extraction of bromopropylate, chlorpyrifos, lambda-cyhalothrin, penconazole, and procymidone prior to the analysis by gas chromatography with an electron capture detector. Operational parameters affecting the extraction efficiency, adsorption and desorption times and temperature, and stirring rate were screened using a Plackett-Burman Design. Emerging parameters were further optimized via Central Composite Design that were 20min at 64 degrees C for adsorption and 4.4min at 250 degrees C for desorption. Solution parameters were optimized to be 5.0mL of sample in pH 2.0 Britton-Robinson buffer containing 0.1mg/L NaCl to promote the volatilization of the analytes. The limits of detection were at the ng/mL level for the pesticides. The fiber was used as a selective and sensitive tool for the trace determination of these pesticides in grape juice.
Gas chromatography, Electron capture detector, Grape juice, Pesticide analysis, Electropolymerization, Solid-phase microextraction
https://hdl.handle.net/11511/33094
ANALYTICAL LETTERS
Department of Chemistry, Article

Suggestions

Investigation of adsorption of pesticides by organo-zeolite from wastewater
Lüle, Güzide Meltem; Atalay, M Ümit; Özbayoğlu, Gülhan; Department of Mining Engineering (2011)
The aim of this study was to determine the adsorption capacity of activated carbon and organo-zeolites for removal of pesticides in water. In order to prepare organo-zeolite, two kinds of cationic surfactants, namely, hexadecyltrimethyl ammonium bromide (HTAB) and dodecyltrimethyl ammonium bromide (DTAB) were used. Adsorption studies of cationic surfactant on zeolite were investigated in respect to initial concentration of cationic surfactant, time, and temperature. It has been found that the best fitted is...
Modification of Quinoa Starch by High Hydrostatic Pressure and Ultrasonication and Assessment of Its Physicochemical Properties
Unal, Kubra; Alpas, Hami; Öztop, Halil Mecit (2023-01-20)
Quinoa starch was extracted and treated with different technologies to modify its properties. High hydrostatic pressure (HHP) at 250, 350, and 500 MPa at 20 and 40 °C and ultrasonication at 100% power with a constant pulse for 15 min were applied as modification methods. Following the treatments, functional, rheological, morphological, and structural analyses were carried out. Time domain (TD) NMR relaxometry experiments confirmed that HHP treatment caused less granule swelling of starch. NMR relaxation spe...
Preparation and characterization of W/O/W type double emulsion containing PGPR-lecithin mixture as lipophilic surfactant
ALTUNTAS, Ozlem Yuce; Şümnü, Servet Gülüm; Şahin, Serpil (Informa UK Limited, 2017-01-01)
The objective of this study is to produce double emulsion by combining polyglycerol polyricinoleate (PGPR) with lecithin as lipophilic surfactant. Although lecithin alone produced only oil-in-water type emulsion, the mixture of lecithin and PGPR could produce water-in-oil type emulsion as well. Moreover, different emulsification treatments were applied to study the influence of homogenization methods on the physicochemical characteristics. The obtained double emulsions were compared in terms of stability an...
COMPARISON OF DIFFERENT ANTIOXIDANT ASSAYS FOR ESTIMATION OF ANTIOXIDANT POTENTIAL OF SELECTED FRUIT JUICE WASTE MATERIALS
Gülenç, Barış Ege; Bayındırlı, Alev; Department of Food Engineering (2022-2-11)
Fruit juice industry waste utilization includes several options that one of them extraction of bioactive compounds exhibiting antioxidant effect. In this study, ultrasound assisted extraction was applied to dried apple, sour cherry and grape pomaces by using ethanol, 50% aqueous ethanol and water solvents. For antioxidant capacity estimation of the extracts, DPPH•, ABTS•+, CUPRAC and FRAP assays were applied. The highest total phenolic contents were obtained for sour cherry and grape pomace 50% aqueous eth...
PREPARATION AND CHARACTERIZATION OF POLYMER COATED SMALL UNILAMELLAR VESICLES
OZDEN, MY; Hasırcı, Vasıf Nejat (1991-09-02)
Glucose oxidase was entrapped in small unilamellar vesicles composed of phosphatidylcholine, dicetyl phosphate and cholesterol. Prediction of the enzyme content of liposomes by calculations based on input concentrations of lipid and protein, dimensions of the lipids and the liposomes yielded one protein per vesicle. The entrapment efficiency was experimentally determined to be about 13%. On the other hand the entrapment efficiency for the small chromate ions was found to be significantly lower (0.1%). T...
Citation Formats
T. N. Dizdas et al., “Preparation and Characterization of a Novel Solid-Phase Microextraction Material for Application to the Determination of Pesticides,” ANALYTICAL LETTERS, pp. 907–916, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/33094.
METU IIS - Integrated Information Service open@metu.edu.tr