Определение Уксусной Кислоты В Промежуточных Фракциях Производства Этанола Модифицированным Пьезосенсором

Linh, Cao Nhat; Akimova, Marina Gennad’yevna; Zyablov, A. N.

doi:10.17308/sorpchrom.2019.19/645

sorpchrom

2019

DOI: 10.17308/sorpchrom.2019.19/645

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Определение Уксусной Кислоты В Промежуточных Фракциях Производства Этанола Модифицированным Пьезосенсором

Cao Nhat Linh¹,

Marina Gennad’yevna Akimova²,

A. N. Zyablov³

Abstract: В работе разработаны пьезоэлектрические сенсоры на основе молекулярно-импринтированных полимеров (МИП) для определения уксусной кислоты в жидкостях. Рассчитаны значения импринтинг-фактора и коэффициенты селективности и установлено, что сенсоры, модифицированные МИП, обладают высокой селективностью к уксусной кислоте, которая являлась темплатом при синтезе полимерного покрытия. Модифицированные пьезосенсоры апробированы при анализе состава промежуточных фракциях производства этанола (бражной дистиллят, эпюрат, … Show more

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Application of Piezosensors Based on the Molecularly Imprinted Polyimide for Determi-Nation of Caffeine in Tea

Линь¹,

Васильевна²,

Николаевич³

et al. 2021

JCPRM

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In this article the molecularly imprinted polymers (MIPs) have been synthesized on the surface of piezosensors. The starting polymer for MIPs production was polyamic acid, which is a copolymer of 1,2,4,5-benzenetetracarboxylic acid and 4,4′-diaminodiphenyl ether. The caffeine served as the template. The quantum-chemical simulation was performed by the Gaussian 09 software using the DFT method at the B3LYP/6-31G(d,p) level with the basis set superposition error (BSSE) at the preliminary stage of the synthesis of the MIP for caffeine. The prepolymerization complexes were calculated to establish intermolecular interactions and obtain the optimum molar ratio between the template and polyamiс acid. It is shown that the constitutional repeating units of polyamic acid interact with the caffeine by forming H-bonds via carboxyl groups. The interaction energy first increases and then decreases with increasing the molar ratio of imprinting. Based on the quantum-chemical calculations, the optimal ratio of the reagents in prepolymerization mixture was set to 1 : 3 with the highest interaction energy (96.7 kJ/mol). Applying thermal imidization of solution of polyamic acid in the presence of a template, the molecularly imprinted polyimide has been synthesized by the non-covalent imprinting method. The ability of the obtained piezosensors to recognize the tempalte in model mixtures was experimentally evaluated. It was found that the range of detectable concentrations of caffeine is 3.1.10-6-10-1 mol/dm3 and the detection limit is 10-6 mol/dm3. Correctness of the caffeine determination in model solutions was verified in the spike/recovery tests. Piezosensors based on MIP were approved for the determination of the caffeine in tea varieties. It is shown that the concentration of caffeine in the aqueous solution increases with increasing brewing time. The relative standard deviation is less than 8%.

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Application of Piezosensors Based on the Molecularly Imprinted Polyimide for Determi-Nation of Caffeine in Tea

Линь¹,

Васильевна²,

Николаевич³

et al. 2021

JCPRM

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The Use of Piezoelectric Systems With Molecular Prints for Formaldehyde Determination in Waste Water of Wood Processing Plants

Zyablov

Меренкова

Belchinskaya

et al. 2021

Forestry Engineering Journal

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The development of methods for controlling formaldehyde content in wastewater, ensuring high accuracy, ease of use, rapidity and efficiency is an urgent problem of the woodworking industry. This article discusses a method for determining the content of formaldehyde and its concentrations in water using piezoelectric sensor systems with molecular imprinting polymers, which make it possible to form three-dimensional complementary voids for the templates of the molecules being detected during polymerization and their subsequent removal. Piezoelectric sensor with molecular imprints of formaldehyde molecules for the express determination of its concentration in solution has been obtained. A grading graph with a linear relationship has been built. The coefficient of determination (R2) was determined to be 0.9815. Unknown concentrations of formaldehyde in solutions were found by the "added-found" method. For sensory determination of unknown concentrations in solution, the standard deviation (Sr,%) is less than 7%. Thus, it has been established that piezoelectric sensors modified with molecularly imprinted polymers allow highly accurate determination of the concentration of unknown pollutants in wastewater of woodworking enterprises. They are economically beneficial, regenerated with further deposition of a polymer with other imprints on their surface

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Определение Уксусной Кислоты В Промежуточных Фракциях Производства Этанола Модифицированным Пьезосенсором

Cited by 2 publications

References 3 publications

Application of Piezosensors Based on the Molecularly Imprinted Polyimide for Determi-Nation of Caffeine in Tea

Application of Piezosensors Based on the Molecularly Imprinted Polyimide for Determi-Nation of Caffeine in Tea

The Use of Piezoelectric Systems With Molecular Prints for Formaldehyde Determination in Waste Water of Wood Processing Plants

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