Process control with mass-sensitive chemical sensors - Cyclodextrine modified polymers as coatings

Dickert, Franz L.; Tortschanoff, Matthias; Weber, Karin; Zenkel, M. E.

doi:10.1007/s002160051030

Cited by 18 publications

(6 citation statements)

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“…26 In fact, cyclodextrin derivatives have been used as sensing coatings for QCMs for detecting benzene and diethyl ether and successfully discriminating optical isomers. [27][28][29] In this work, we developed QCM sensors coated with novel cyclodextrin derivatives bearing some functional groups, which provide tunable properties to fit guest analytes, and the QCM sensors were employed to detect methanol vapour on-line. The QCM sensor response and cross-sensitivity are discussed.…”

Section: Introductionmentioning

confidence: 99%

Cyclodextrin derivative-coated quartz crystal microbalances for alcohol sensing and application as methanol sensors

Wang

Chen

et al. 2001

Analyst

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Three novel cyclodextrin derivatives, mono(6-benzylimino-6-deoxy)-beta-cyclodextrin (2), mono-(6-cyclohexylamino-6-deoxy)-beta-cyclodextrin (3) and mono(6-benzylamino-6-deoxy)-beta-cyclodextrin (4), together with mono(6-phenylamino-6-deoxy)-beta-cyclodextrin (1), were synthesized and employed as sensing materials coated on quartz crystal microbalances (QCMs). Comparison of the responses to some alcohol and solvent vapours such as methanol, ethanol, propan-1-ol, propan-2-ol, butan-1-ol, acetone, chloroform and benzene indicated that these beta-cyclodextrin derivatives show considerable sensitivity and selectivity towards methanol. It shows a good linear relationship between the frequency shift and the methanol concentration in the range 3-160 mg L(-1) for 2-4 and 3-140 mg L(-1) for 1. The correlation coefficients are 0.9971, 0.9983, 0.9973 and 0.9977, respectively. The limit of detection (LOD) is 0.2 mg L(-1). When small amounts of other vapours co-exist, e.g., ethanol, propan-1-ol and acetone, the responses differ from that of pure methanol vapour, and a deduction method could eliminate this cross-sensitivity. The water cross-sensitivity was very low. These QCMs coated with cyclodextrin derivatives are employed as methanol sensors in the real atmosphere to detect on-line the concentration of methanol vapour.

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Section: Introductionmentioning

confidence: 99%

Cyclodextrin derivative-coated quartz crystal microbalances for alcohol sensing and application as methanol sensors

Wang

Chen

et al. 2001

Analyst

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“…In the meantime, we have been able to apply our MIP coated chemosensors to a vast range of analytes, such as vapours, 8,9 complex mixtures 10 and most recently microorganisms. Our aim is to develop highly sensitive chemical sensors with selective enrichment capabilities, especially in the aqueous phase, 11 with good reversibility and suitable response times to allow effortless on-line monitoring in gaseous and liquid phases.…”

Section: Introductionmentioning

confidence: 99%

Synthetic receptors as sensor coatings for molecules and living cells

Dickert

Hayden

Halikias

2001

Analyst

109

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Non-covalent molecularly imprinted polymers are applied as sensitive coatings to planar waveguides and mass-sensitive devices for the selective detection of various groups of analytes in the gaseous and aqueous phases. Cavity imprinting in the bulk of the sensor material as well as surface imprinting techniques are used to enrich analytes ranging from sub-nanometres to micrometres in analyte size. The coated devices provide sensitivity to e.g. polycyclic aromatic hydrocarbons, xanthine derivatives, complex coffee samples and whole microorganisms.

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“…It is possible to customize these guest molecules for different hosts and influence their chemical properties by varying the size of the hollow or subunit arrangements, which is of interest for both experimental results and their understanding with the help of computational chemistry. Besides separations in gas chromatography with high stereoselectivity, cyclodextrines [2,3] are already used in analytical chemistry for mass-sensitive detection principles. The hydrophilic hydroxyl groups at the upper and the lower rim of the β-cyclodextrine cavity affect the cross sensitivity to water, which makes it very difficult to use them as sensor materials.…”

Section: Introductionmentioning

confidence: 99%

Host-Guest Chemistry and Chemical Sensors: FT-IR-Analysis and Spectra Simulation of CDCl3 Inclusion

Dickert¹,

Landgraf²,

Sikorski³

2000

J Mol Model

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Host-guest principles are put into action advantageously by cyclodextrins that give remarkable sensor responses to halogenated hydrocarbons on mass-sensitive devices such as QMB (quartz micro balance) and SAW (surface acoustic wave) resonators. Modifications of the structure can tune the compound to different analytes and molecular modeling allows us to understand and predict specific host-guest interactions. The FT-IR analysis of CDCl 3 , incorporated into a partially methylated cyclodextrine, yields an astonishingly strong band shift of about 50 cm -1 to lower wave numbers, in contrast to the permethylated product that shows a displaced band of 10 cm -1 for the C-D stretching vibration. The explanation can be given by semiempirical methods and force field calculations. Two CDCl 3 binding sites are revealed, one being a multicentered inclusion ( ν~ 2195 cm -1 ) of CDCl 3 at the upper rim of the β-cyclodextrine cone, whereas the other is incorporated within the cavity ( ν~2 240 cm -1 ).

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Process control with mass-sensitive chemical sensors - Cyclodextrine modified polymers as coatings

Cited by 18 publications

References 0 publications

Cyclodextrin derivative-coated quartz crystal microbalances for alcohol sensing and application as methanol sensors

Cyclodextrin derivative-coated quartz crystal microbalances for alcohol sensing and application as methanol sensors

Synthetic receptors as sensor coatings for molecules and living cells

Host-Guest Chemistry and Chemical Sensors: FT-IR-Analysis and Spectra Simulation of CDCl3 Inclusion

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