FAD: Techniques

Contact Info

Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

Electrode

Classification: Electrode -> ion selective -> picrate

Citations 3

'Construction And Use Of A Tubular Picrate Ion-selective Electrode For Reducing Sugar Determination In Port Wine By Flow Injection Analysis', Anal. Chim. Acta, 1995 308(1-3) 122-128

"Construction And Use Of A Tubular Picrate Ion-selective Electrode For Reducing Sugar Determination In Port Wine By Flow Injection Analysis"
Anal. Chim. Acta 1995 Volume 308, Issue 1-3 Pages 122-128

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			'title' => 'Continuous-flow serum albumin determination by reaction with picrate ions, with use of a flow-through picrate-ion electrode',
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Teresa I. M. S. Lopesa, António O. S. S. Rangela,*, JoséL. F. C. Limab and M. Conceição B. S. M. Montenegrob

Abstract: An FIA system equipped with a picrate ISE was described for the determination of reducing sugars in port wine. The determination was based on the reaction between the reducing sugars and picric acid and the measurement of the decrease in the picrate concentration by a tubular, flow-through detector. A 150 µL volume of wine was injected into a 0.045 M picric acid carrier stream (0.7 ml/min) which was merged with a 1.8 M NaOH stream (0.2 ml/min). After passing through a thermostatted water bath at 58°C, the flow was merged with a 1 M H2SO4 stream (0.2 ml/min). The flow passed through a 100 cm mixing coil to the detector. The calibration graph was linear for 25-200 g/l of reducing sugars and the RSD were 3.9%. The sampling frequency was ~e;50 samples/h. The results obtained for samples containing 98-148 g/l of reducing sugars were in agreement with those obtained by an iodometric reference method.

Sugars, reducing Port Wine Method comparison Indirect Heated reaction

'Continuous-flow Potentiometric Determination Of Creatinine In Urine With A Picrate-ion-selective Electrode', Microchem. J., 1982 27(4) 512-518

"Continuous-flow Potentiometric Determination Of Creatinine In Urine With A Picrate-ion-selective Electrode"
Microchem. J. 1982 Volume 27, Issue 4 Pages 512-518

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E. P. Diamandis and T. P. Hadjiioannou

Abstract: A completely automated potentiometric method for the determination of creatinine in urine is described. Creatinine reacts with picrate in alkaline media (Jaffe reaction) in a flow system, and the decrease in picrate activity is continuously monitored with a picrateselective flow-through electrode. Creatinine in urine, in the range 0.5-3 g/liter, was determined in a sample volume of 0.15 ml, with a relative standard deviation of about 1%. Forty samples per hour can be analyzed without previous dilution or pretreatment. Recovery of creatinine added to urine samples ranged from 90 to 111% with an average of 96.7%. The method compares favorably with a photometric method. The proposed automated method is suitable for routine clinical measurements and screening tests.

Creatinine Urine

'Continuous-flow Serum Albumin Determination By Reaction With Picrate Ions, With Use Of A Flow-through Picrate-ion Electrode', Clin. Chem., 1981 27(3) 427-430

"Continuous-flow Serum Albumin Determination By Reaction With Picrate Ions, With Use Of A Flow-through Picrate-ion Electrode"
Clin. Chem. 1981 Volume 27, Issue 3 Pages 427-430

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			'title' => 'Construction and use of a tubular picrate ion-selective electrode for reducing sugar determination in port wine by flow injection analysis',
			'journal' => 'Anal. Chim. Acta',
			'journal_id' => '0584',
			'fadid' => 'ANCA1995V0308P00122',
			'year' => '1995',
			'volume' => '308',
			'issue' => '1-3',
			'startpage' => '122',
			'endpage' => '128',
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			'abstract' => 'An FIA system equipped with a picrate ISE was described for the determination of reducing sugars in port wine. The determination was based on the reaction between the reducing sugars and picric acid and the measurement of the decrease in the picrate concentration by a tubular, flow-through detector. A 150 &micro;L volume of wine was injected into a 0.045 M picric acid carrier stream (0.7 ml/min) which was merged with a 1.8 M NaOH stream (0.2 ml/min). After passing through a thermostatted water bath at 58&deg;C, the flow was merged with a 1 M H2SO4 stream (0.2 ml/min). The flow passed through a 100 cm mixing coil to the detector. The calibration graph was linear for 25-200 g/l of reducing sugars and the RSD were 3.9%. The sampling frequency was ~e;50 samples/h. The results obtained for samples containing 98-148 g/l of reducing sugars were in agreement with those obtained by an iodometric reference method.',
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			'url' => '10.1016/0003-2670(94)00598-G',
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			'citation' => ''Construction and use of a tubular picrate ion-selective electrode for reducing sugar determination in port wine by flow injection analysis', Anal. Chim. Acta, 1995 308(1-3) 122-128',
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			'authors' => 'Diamandis, E.P.;Hadjiioannou, T.P.',
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			'title' => 'Continuous-flow potentiometric determination of creatinine in urine with a picrate-ion-selective electrode',
			'journal' => 'Microchem. J.',
			'journal_id' => '0639',
			'fadid' => 'MCHJ1982V0027P00512',
			'year' => '1982',
			'volume' => '27',
			'issue' => '4',
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			'endpage' => '518',
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			'abstract' => 'A completely automated potentiometric method for the determination of creatinine in urine is described. Creatinine reacts with picrate in alkaline media (Jaffe reaction) in a flow system, and the decrease in picrate activity is continuously monitored with a picrateselective flow-through electrode. Creatinine in urine, in the range 0.5-3 g/liter, was determined in a sample volume of 0.15 ml, with a relative standard deviation of about 1%. Forty samples per hour can be analyzed without previous dilution or pretreatment. Recovery of creatinine added to urine samples ranged from 90 to 111% with an average of 96.7%. The method compares favorably with a photometric method. The proposed automated method is suitable for routine clinical measurements and screening tests. ',
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			'citation' => ''Continuous-flow potentiometric determination of creatinine in urine with a picrate-ion-selective electrode', Microchem. J., 1982 27(4) 512-518',
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			'title' => 'Continuous-flow serum albumin determination by reaction with picrate ions, with use of a flow-through picrate-ion electrode',
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EP Diamandis, DS Papastathopoulos and TP Hadjiioannou

Abstract: An automated potentiometric method for serum albumin determination by use of the picrate/albumin reaction is described. A continuous-flow system and a specially designed flow-through picrate ion electrode were used in making the measurements. Various factors affecting the reaction, such as pH, picrate ion concentration, and reaction time, were studied. Peak height in millivolts and albumin concentration were linearly related in the range 10^-70 g/L. Both within-run and day-to- day, the CV for the method was about 2%. Analytical recovery of albumin added to serum samples ranged from 97.0 to 110.3%, averaging 102.2%. Results compare favorably with those by the established bromcresol green method. The proposed method is suitable for routine use and for screening tests.

Albumin Blood Serum