Development of Cloud Point Extraction-Scanometry, for the Preconcentration and Determination of Colorless Species: Application for the Determination of Phenylalanine

Shokrollahi, Ardeshir; Refahi, Masuod

doi:10.21577/0100-4042.20170303

Cited by 4 publications

(3 citation statements)

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“…These are the most numerous according to the research carried out so far. In determining the essential amino acid Phe, optical methods were used, respectively: colorimetry [22,23]. UV and IR spectrophotometry [24], fluorescence [25][26][27][28][29], enhanced fluorescence [30], chemiluminescence [31][32][33]; separation methods, such as: gas chromatography [34], capillary electrophoresis, HPLC-high performance liquid chromatography [22,[35][36][37][38][39][40][41][42][43][44]; spectroscopic methods: Raman spectroscopy [45,46], laser-assisted spectroscopy [47], UV-Vis spectroscopy and chemometry [48]; UV−Vis and surface-enhanced Raman scattering [49], nuclear magnetic resonance [50] and circular dichroism spectroscopy [51]; mass spectrometry [22,34,41,52], fluorimetry [53].…”

Section: Instrumental Methodsmentioning

confidence: 99%

A Review on Electrochemical Sensors and Biosensors Used in Phenylalanine Electroanalysis

Dinu

Apetrei

2020

Sensors

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Phenylalanine is an amino acid found in breast milk and in many foods, being an essential nutrient. This amino acid is very important for the human body because it is transformed into tyrosine and, subsequently, into catecholamine neurotransmitters. However, there are individuals who were born with a genetic disorder called phenylketonuria. The accumulation of phenylalanine and of some metabolites in the body is dangerous and may cause convulsions, brain damage and mental retardation. Determining the concentration of phenylalanine in different biologic fluids is very important because it can provide information about the health status of the individuals envisaged. Since such determinations may be made by using electrochemical sensors and biosensors, numerous researchers have developed such sensors for phenylalanine detection and different sensitive materials were used in order to improve the selectivity, sensitivity and detection limit. The present review aims at presenting the design and performance of some electrochemical bio (sensors) traditionally used for phenylalanine detection as reported in a series of relevant scientific papers published in the last decade.

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Section: Instrumental Methodsmentioning

confidence: 99%

A Review on Electrochemical Sensors and Biosensors Used in Phenylalanine Electroanalysis

Dinu

Apetrei

2020

Sensors

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“…For a set of 62 structures composed of linear alkyl, branched alkyl, cyclic alkyl and alkyl ethoxylate chains, the cloud point can be estimated with an accuracy of + 6.38 • C using the logarithm of the number of ethylene oxide residues. At lower temperatures, the molecules of each nonionic surfactant form hydrogen bonds with the water layer using their polar groups (polar heads) and polyoxyethylene units (Shokrollahi & Refahi 2019). When the temperature increases, there is an increase in entropy, which causes dehydration of the polyoxyethylene chains and destroys the layer of water molecules.…”

Section: Cloud Pointmentioning

confidence: 99%

Cloud Point Extraction as a Method for Preconcentration of Metal Ions

Hasić

Horozić

2020

J. eng. process. manag.

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Cloud point extraction (CPE) is an attractive technique that reduces solvent con- sumption and exposure, disposal costs, and process time. This method has an im- portant practical application and is used to separate and concentrate the analyte as a step before its determination, and after the formation of a poorly water-soluble complex. Use of nonionic surfactants as ”green solvents” which represent an effec- tive alternative to toxic organic solvents (in classical extraction), along with other advantages, such as low cost and low flammability, makes this method attractive and worth further research and optimization. This paper presents a detailed de- scription of the principles, procedure, advantages, disadvantages and application of CPE.

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“…Over the years, many scientific researchers have developed numerous methods through which these AAs can be detected rapidly and precisely, both in biological and in pharmaceutical products. From among these methods, mention must be made of the classical high-performance liquid chromatography (HPLC) [1][2][3][4][5], mass spectrometry [6][7][8][9], fluorimetry [10], colorimetry [7,11,12], chemiluminescence [13][14][15], Raman spectroscopy [16,17], UV-Vis spectroscopy [18], capillary electrophoresis [19][20][21], and atomic force spectroscopy [22]. Moreover, versatile methods for detecting AAs have been developed and used: electrochemical ones based on sensors and biosensors, which use cyclic voltammetry (CV) [23][24][25][26][27][28] as a detection method, chronoamperometry (CA) [29], differential pulse voltammetry (DPV) [30][31][32], square wave voltammetry (SWV) [33][34][35], and linear sweep voltammetry (LSV) [36,37].…”

Section: Introductionmentioning

confidence: 99%

A Review of Sensors and Biosensors Modified with Conducting Polymers and Molecularly Imprinted Polymers Used in Electrochemical Detection of Amino Acids: Phenylalanine, Tyrosine, and Tryptophan

Dinu

Apetrei

2022

IJMS

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Recently, the studies on developing sensors and biosensors—with an obvious interdisciplinary character—have drawn the attention of many researchers specializing in various fundamental, but also complex domains such as chemistry, biochemistry, physics, biophysics, biology, bio-pharma-medicine, and bioengineering. Along these lines, the present paper is structured into three parts, and is aimed at synthesizing the most relevant studies on the construction and functioning of versatile devices, of electrochemical sensors and biosensors, respectively. The first part presents examples of the most representative scientific research focusing on the role and the importance of the phenylalanine, tyrosine, and tryptophan amino acids, selected depending on their chemical structure and their impact on the central nervous system. The second part is dedicated to presenting and exemplifying conductor polymers and molecularly imprinted polymers used as sensitive materials in achieving electrochemical sensors and biosensors. The last part of the review analyzes the sensors and biosensors developed so far to detect amino acids with the aid of conductor polymers and molecularly imprinted polymers from the point of view of the performances obtained, with emphasis on the detection methods, on the electrochemical reactions that take place upon detection, and on the electroanalytical performances. The present study was carried out with a view to highlighting, for the benefit of specialists in medicine and pharmacy, the possibility of achieving and purchasing efficient devices that might be used in the quality control of medicines, as well as in studying and monitoring diseases associated with these amino acids.

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Development of Cloud Point Extraction-Scanometry, for the Preconcentration and Determination of Colorless Species: Application for the Determination of Phenylalanine

Cited by 4 publications

References 0 publications

A Review on Electrochemical Sensors and Biosensors Used in Phenylalanine Electroanalysis

A Review on Electrochemical Sensors and Biosensors Used in Phenylalanine Electroanalysis

Cloud Point Extraction as a Method for Preconcentration of Metal Ions

A Review of Sensors and Biosensors Modified with Conducting Polymers and Molecularly Imprinted Polymers Used in Electrochemical Detection of Amino Acids: Phenylalanine, Tyrosine, and Tryptophan

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