Cyclodextrins

Ritter, Helmut; Tabatabai, Monir

doi:10.1002/0471440264.pst509

Cited by 5 publications

(3 citation statements)

References 53 publications

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“…The β‐CD can form an inclusion complex with neonicotinoids, increasing the sensitivity of detection. This complex is generated in aqueous system, called complexation in solution, where the β‐CD solution was kept for a while in the presence of the neonicotinoid insecticide under stirring . The inclusion complex is formed when the analyte is included in the β‐CD cavity, or binding site.…”

Section: Resultsmentioning

confidence: 95%

An Electrochemical Sensor Based on Electropolymerization of ß‐Cyclodextrin and Reduced Graphene Oxide on a Glassy Carbon Electrode for Determination of Neonicotinoids

2018

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An electrochemical sensor of glassy carbon electrode modified with reduced graphene oxide and β‐cyclodextrin (GCE/rGO/β‐CD) was developed as an effective alternative in the determination of neonicotinoid insecticides, imidacloprid, clothianidin and thiamethoxam, in honey samples. The peak current variation obtained with the proposed sensor was higher compared to the bare GCE in all the analytes. In the determination of imidacloprid the response increased by 1300 %, clothianidin by 670 % and thiametoxam by 630 %. In addition, the optimization of the experimental conditions provided the construction of a sensor with greater sensitivity. The study of interferers showed that inorganic ions (Ca2+, Mg2+, Fe2+, K+, Na+, e NH4+) and other insecticides (acetamiprid and dinotefuran) did not influence the reduction of imidacloprid, clothianidin and thiamethoxam. The determination of imidacloprid, clothianidin and thiamethoxam in honey samples exhibited recovery values within the EPA range (between 107.75 and 116 %). In conclusion, the developed sensor GCE/rGO/β‐CD proved to be an effective alternative in the determination of neonicotinoid insecticides in honey samples.

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Section: Resultsmentioning

confidence: 95%

An Electrochemical Sensor Based on Electropolymerization of ß‐Cyclodextrin and Reduced Graphene Oxide on a Glassy Carbon Electrode for Determination of Neonicotinoids

2018

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“…The CDs can form inclusion complexes with various analytes, increasing the detection sensitivity. This preparation generally occurs in an aqueous system, known as complexation in solution, where the CD is kept for a time in the presence of the target molecule under stirring . This method was used in this work.…”

Section: Resultsmentioning

confidence: 99%

Optimization of an Electrochemical Sensor for Determination of Imidacloprid Based on β‐cyclodextrin Electropolymerization on Glassy Carbon Electrode

2018

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An electrochemical sensor based on electropolymerization of β‐cyclodextrin (β‐CD) on a glassy carbon electrode (GCE) was developed for the determination of imidacloprid (IMP). That insecticide is the most commonly used insecticides globally and has been related to the death of bee colonies around the world are imperative. So the development of a simple, cheap and sensitive method for IMP determination is essential. This work aims the modification of a GCE by β‐CD film. The analytical response obtained with GCCE/β‐CD in the presence of the IMP showed an increase in the peak current variation of 947 % in relation to the bare GCE, indicating that the analyte was encapsulated in the β‐CD increasing the detection sensitivity. The followed experimental conditions were optimized: potential range (−1.3 to 0.9 V), presence or absence of dissolved oxygen (presence) and stirring during the electropolymerization (with agitation), number of cycles (5 scans), electrolyte pH (pH=5.0), scan rate (100 mV s−1) and concentration of β‐CD (6 mol L−1). The optimization promoted a peak current variation increase of 57 %, developing a more sensitivity methodology.

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“…Cyclodextrins are a widely studied group of compounds because of their ability to form inclusion complexes with suitable organic compounds 1–6. Additionally, their application together with enzymes in organic synthesis7 and food chemistry8 has been studied.…”

Section: Introductionmentioning

confidence: 99%

Cyclodextrins in Polymer Synthesis: Enzymatic Polymerization of a 2,6‐Dimethyl‐β‐Cyclodextrin/2,4‐Dihydroxyphenyl‐4′‐Hydroxybenzylketone Host‐Guest Complex Catalyzed by Horseradish Peroxidase (HRP)

Mejias

Schollmeyer

Sepúlveda-Boza³

et al. 2003

Macromolecular Bioscience

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This paper reports the enzymatic polymerization of the inclusion complex 2,4‐dihydroxyphenyl‐4′‐hydroxybenzylketone/2,6‐dimethyl‐β‐cyclodextrin by horseradish peroxidase (HRP) in aqueous media. The structure of the complex was determined by means of NOESY‐NMR and crystallographic analysis (indicating an orthorhombic structure). The enzymatic polymerization of the uncomplexed 2,4‐dihydroxyphenyl‐4′‐hydroxybenzylketone yields oligomers with molecular weights up to $\overline M _{\rm w} = 4 \times 10^3$ in organic‐aqueous media, but because of its poor solubility in aqueous systems, no polymerization is observed if water is used as solvent. An increase of the availability of the ketone in solution is achieved by complexing it with random‐methylated β‐cyclodextrin in water. We found that the use of methylated β‐cyclodextrin in equimolar concentration to the monomer increases the polymerization yield and the average molecular weight. The polymers formed were analyzed by GPC and ATR‐FTIR techniques.Representation from X‐ray diffraction analysis of the 2,6‐dimethyl‐β‐cyclodextrin/2,4‐dihydroxyphenyl‐4′‐hydroxybenzylketone host‐guest complex (3).magnified imageRepresentation from X‐ray diffraction analysis of the 2,6‐dimethyl‐β‐cyclodextrin/2,4‐dihydroxyphenyl‐4′‐hydroxybenzylketone host‐guest complex (3).

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Cyclodextrins

Cited by 5 publications

References 53 publications

An Electrochemical Sensor Based on Electropolymerization of ß‐Cyclodextrin and Reduced Graphene Oxide on a Glassy Carbon Electrode for Determination of Neonicotinoids

An Electrochemical Sensor Based on Electropolymerization of ß‐Cyclodextrin and Reduced Graphene Oxide on a Glassy Carbon Electrode for Determination of Neonicotinoids

Optimization of an Electrochemical Sensor for Determination of Imidacloprid Based on β‐cyclodextrin Electropolymerization on Glassy Carbon Electrode

Cyclodextrins in Polymer Synthesis: Enzymatic Polymerization of a 2,6‐Dimethyl‐β‐Cyclodextrin/2,4‐Dihydroxyphenyl‐4′‐Hydroxybenzylketone Host‐Guest Complex Catalyzed by Horseradish Peroxidase (HRP)

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