Synthesis by precipitation polymerization of a molecularly imprinted polymer membrane for the potentiometric determination of sertraline in tablets and biological fluids

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Abstract

A potentiometric chemosensor for selective determination of sertraline was developed based on the molecular imprinting technique. The molecularly imprinted polymer was synthesized by precipitation polymerization, using sertraline hydrochloride as a template molecule, methacrylic acid as a functional monomer and ethylene glycol dimethacrylate as a cross-linking agent. The sensor was developed by dispersing the sertraline imprinted polymer particles in dibutyl sebacate plasticizer and embedding in poly(vinyl chloride) matrix. Characteristics of the proposed sensor were evaluated by measuring the potential response to sertraline hydrochloride in the range from 1.0 µmol L-1 to 10 mmol L-1 with a near Nernstian response of 57.7 mV decade-1 and a limit of detection of 0.8 µmol L-1. The potentiometric selectivity coefficients of the proposed sensor were evaluated and it exhibited good selectivity to sertraline with respect to the other antidepressants. It was used as indicator electrode in potentiometric determination of sertraline in tablets and biological fluids.

Translated abstract

Um quimiossensor potenciométrico para determinação seletiva de sertralina foi desenvolvido, baseado na técnica de impressão molecular. O polímero impresso molecularmente foi sintetizado através da polimerização por precipitação, usando hidrocloreto de sertralina como molécula molde, ácido metacrílico como monômero funcional e dimetacrilato de etileno glicol como um agente de ligação cruzada. O sensor foi desenvolvido pela dispersão das partículas de polímero impressas na sertralina, em plastificante dibutil sebacato e incorporação em matiz de poli(cloreto de vinila). As características do sensor proposto foram avaliadas medindo a resposta do potencial para hidrocloreto de sertralina, no intervalo de 1,0 µmol L-1 a 10 mmol L-1 com resposta Nernstiniana de 57,7 mV década-1 e um limite de detecção de 0,8 µmol L-1. Os coeficientes de seletividade potenciométrica do sensor proposto foram avaliados e exibiram boa seletividade para sertralina com relação a outros antidepressivos. Foi usado como eletrodo indicador na determinação potenciométrica de sertralina em comprimidos e fluidos biológicos.

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Smart cup: A minimally-instrumented, smartphone-based point-of-care molecular diagnostic device

Shih-Chuan Liao, Jing Peng, Michael Mauk … (2016)

Nucleic acid amplification-based diagnostics offer rapid, sensitive, and specific means for detecting and monitoring the progression of infectious diseases. However, this method typically requires extensive sample preparation, expensive instruments, and trained personnel. All of which hinder its use in resource-limited settings, where many infectious diseases are endemic. Here, we report on a simple, inexpensive, minimally-instrumented, smart cup platform for rapid, quantitative molecular diagnostics of pathogens at the point of care. Our smart cup takes advantage of water-triggered, exothermic chemical reaction to supply heat for the nucleic acid-based, isothermal amplification. The amplification temperature is regulated with a phase-change material (PCM). The PCM maintains the amplification reactor at a constant temperature, typically, 60-65°C, when ambient temperatures range from 12 to 35°C. To eliminate the need for an optical detector and minimize cost, we use the smartphone’s flashlight to excite the fluorescent dye and the phone camera to record real-time fluorescence emission during the amplification process. The smartphone can concurrently monitor multiple amplification reactors and analyze the recorded data. Our smart cup’s utility was demonstrated by amplifying and quantifying herpes simplex virus type 2 (HSV-2) with LAMP assay in our custom-made microfluidic diagnostic chip. We have consistently detected as few as 100 copies of HSV-2 viral DNA per sample. Our system does not require any lab facilities and is suitable for use at home, in the field, and in the clinic, as well as in resource-poor settings, where access to sophisticated laboratories is impractical, unaffordable, or nonexistent.