Chemical Sensors Based on Molecularly Imprinted Sol-Gel Materials

Mujahid, Adnan; Lieberzeit, Peter A.; Dickert, Franz L.

doi:10.3390/ma3042196

Cited by 95 publications

(61 citation statements)

References 88 publications

(92 reference statements)

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“…This finding is indicating that the template removal process is effective [16]. 5 shows that the number of pores MIP simazine after washing is more than the MIP simazine before washing.…”

Section: Fig 1 Standard Of Simazinesupporting

confidence: 54%

Preparation of molecularly imprinted polymers simazine as material potentiometric sensor

et al. 2017

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Abstract. Molecular imprinting technology is a promising technique for creating recognition elements for selected compounds and has been successfully applied for synthesis of environmental pollutants such as simazine. Simazine is a pesticide ingredient that is commonly used in agriculture, which has devastating effects on the environment if used excessively. Molecularly imprinted polymer (MIP) provides cavities to form a particular space generated by removing the template when the polymer has formed. In this study, MIP using simazine as template had been made by the cooling-heating method and used as a material potentiometric sensor for detecting simazine. A template (simazine) was incorporated into a pre-polymerization solution that contains a methacrylic acid as functional monomer, an ethylene glycol dimethacrylate as cross linker, and benzoyl peroxide as initiator. Characterization was performed by scanning electron microscope (SEM) and fourier transforms infra-red (FTIR). The FTIR spectra of the MIP showed that the peaks of amine group decrease significantly, indicating that the simazine concentration decreases drastically. Characterization by SEM images showing the broadest pore size distribution with the highest number of pores in the MIP prepared under the heating time of 150 min. The MIPs therefore could be applied as a simazine sensor.

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“…This finding is indicating that the template removal process is effective [16]. 5 shows that the number of pores MIP simazine after washing is more than the MIP simazine before washing.…”

Section: Fig 1 Standard Of Simazinesupporting

confidence: 54%

Preparation of molecularly imprinted polymers simazine as material potentiometric sensor

et al. 2017

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“…Sol-gel is a well-known process concerning transition of a system from liquid 'sol' (the colloidal suspension of particles) into solid 'gel' (Mac-Craith et al, 1997). The chemistry of sol-gel processes includes the hydrolysis of a precursor, condensation of the hydrolysis product to form a sol solution, gelatinizing the sol solution to form a gel, drying the formed gel and heat treatment of the dried sol-gel material (Dunn and Zink, 1991;Mujahid et al, 2010). Generally, metal alkoxides are used as precursors because they hydrolyze when they are exposed to water.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, metal alkoxides are used as precursors because they hydrolyze when they are exposed to water. The partially hydrolyzed alkoxide molecules react with each other or with the un-hydrolyzed ones to undergo a condensation reaction and form a cross-linked matrix liberating water or alcohol (Mujahid et al, 2010). In the end, an interconnected, homogenous and rigid material is obtained.…”

Section: Introductionmentioning

confidence: 99%

Microcystin-LR detection in water by the Fabry–Pérot interferometer using an optical fibre coated with a sol–gel imprinted sensing membrane

Queirós

Silva

Noronha

et al. 2011

Biosensors and Bioelectronics

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a b s t r a c tCyanobacteria deteriorate the water quality and are responsible for emerging outbreaks and epidemics causing harmful diseases in Humans and animals because of their toxins. Microcystin-LR (MCT) is one of the most relevant cyanotoxin, being the most widely studied hepatotoxin. For safety purposes, the World Health Organization recommends a maximum value of 1 g L −1 of MCT in drinking water. Therefore, there is a great demand for remote and real-time sensing techniques to detect and quantify MCT.In this work a Fabry-Pérot sensing probe based on an optical fibre tip coated with a MCT selective thin film is presented. The membranes were developed by imprinting MCT in a sol-gel matrix that was applied over the tip of the fibre by dip coating. The imprinting effect was obtained by curing the sol-gel membrane, prepared with (3-aminopropyl) trimethoxysilane (APTMS), diphenyl-dimethoxysilane (DPDMS), tetraethoxysilane (TEOS), in the presence of MCT. The imprinting effect was tested by preparing a similar membrane without template.In general, the fibre Fabry-Pérot with a Molecular Imprinted Polymer (MIP) sensor showed low thermal effect, thus avoiding the need of temperature control in field applications. It presented a linear response to MCT concentration within 0.3-1.4 g L −1 with a sensitivity of −12.4 ± 0.7 nm L g −1 . The corresponding Non-Imprinted Polymer (NIP) displayed linear behaviour for the same MCT concentration range, but with much less sensitivity, of −5.9 ± 0.2 nm L g −1 . The method shows excellent selectivity for MCT against other species co-existing with the analyte in environmental waters. It was successfully applied to the determination of MCT in contaminated samples. The main advantages of the proposed optical sensor include high sensitivity and specificity, low-cost, robustness, easy preparation and preservation.

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“…The foremost advantage of MIPs in chemical and/biosensing applications is the possibility to easily integrate MIPs with different transducer devices such as QCM [60,61]. Due to their exceptional characteristics, MIPs are considered as potential candidate for virus sensing applications and often exhibit high recognition proficiency and selectivity [62].…”

Section: Synthetic Antibodies: Molecularly Imprinted Polymers For Qcmmentioning

confidence: 99%

Gravimetric Viral Diagnostics: QCM Based Biosensors for Early Detection of Viruses

et al. 2017

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Viruses are pathogenic microorganisms that can inhabit and replicate in human bodies causing a number of widespread infectious diseases such as influenza, gastroenteritis, hepatitis, meningitis, pneumonia, acquired immune deficiency syndrome (AIDS) etc. A majority of these viral diseases are contagious and can spread from infected to healthy human beings. The most important step in the treatment of these contagious diseases and to prevent their unwanted spread is to timely detect the disease-causing viruses. Gravimetric viral diagnostics based on quartz crystal microbalance (QCM) transducers and natural or synthetic receptors are miniaturized sensing platforms that can selectively recognize and quantify harmful virus species. Herein, a review of the label-free QCM virus sensors for clinical diagnostics and point of care (POC) applications is presented with major emphasis on the nature and performance of different receptors ranging from the natural or synthetic antibodies to selective macromolecular materials such as DNA and aptamers. A performance comparison of different receptors is provided and their limitations are discussed.

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Chemical Sensors Based on Molecularly Imprinted Sol-Gel Materials

Cited by 95 publications

References 88 publications

Preparation of molecularly imprinted polymers simazine as material potentiometric sensor

Preparation of molecularly imprinted polymers simazine as material potentiometric sensor

Microcystin-LR detection in water by the Fabry–Pérot interferometer using an optical fibre coated with a sol–gel imprinted sensing membrane

Gravimetric Viral Diagnostics: QCM Based Biosensors for Early Detection of Viruses

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