Comparison of flow analyzers with laminar or pulsed flows and immobilized reagents: application to samples of pharmaceutical, agronomical and/or environmental relevance

• Grant number: 11/14413-0
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: January 01, 2012
• End date: November 30, 2015
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
• Principal Investigator: Elias Ayres Guidetti Zagatto
• Grantee: Milton Katsumi Sasaki
• Host Institution: Centro de Energia Nuclear na Agricultura (CENA). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

Recent work has demonstrated the advantages of exploiting pulsed rather than laminar flows for flow-based chemical analyses. This has not been investigated in relation to procedures involving immobilization of chemical species in liquid membranes or in the walls of open tubular reactors. It is intended therefore a comparative study of flow systems exploiting laminar or pulsed flows in relation to liquid-liquid extraction in immobilized organic phase (SLME, supported liquid membrane extraction) and solid reagents impregnated on the inner wall of a tubular reactor. To this end, the organic solvent chloroform and the crystalline MnO2 (s) will be considered. After assimilation of the immobilization techniques and the comparison of model analyzers, analytical procedures for determinations of agronomical, pharmaceutical and / or environmental relevance will be developed. Initially, focus will be placed on the spectrophotometric determinations of caffeine in food (including coffee) exploiting SLME and of ascorbic acid in soft drinks and pharmaceutical formulations using MnO2 (s). The feasibility of designing advanced flow systems for the spectrophotometric determinations of phosphate in natural waters and metals in plant materials using SLME and MnO2 (s) will be further investigated.

Scientific publications

(6)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

GONZALEZ, PABLO; KNOCHEN, MOISES; SASAKI, MILTON K.; ZAGATTO, ELIAS A. G.. Pulsed flows in flow analysis: Potentialities, limitations and applications. Talanta, v. 143, p. 419-430, OCT 1 2015. (11/14413-0, 11/23498-9)

BATISTA, ALEX D.; SASAKI, MILTON K.; ROCHA, FABIO R. P.; ZAGATTO, ELIAS A. G.. Flow analysis in Brazil: contributions over the last four decades. ANALYST, v. 139, n. 15, p. 3666-3682, 2014. (11/06437-6, 11/14413-0, 11/23498-9)

SASAKI, MILTON K.; FERES, MARIO A.; ZAGATTO, ELIAS A. G.. Flow Systems with MnO2-coated Open Tubular Reactors for Spectrophotometric Determination of Ascorbic Acid in Pharmaceutical Products. Analytical Letters, v. 49, n. 5, p. 12-pg., 2016-03-23. (11/23498-9, 11/14413-0)

SASAKI, MILTON K.; FERES, MARIO A.; ZAGATTO, ELIAS A. G.. Flow Systems with MnO2-coated Open Tubular Reactors for Spectrophotometric Determination of Ascorbic Acid in Pharmaceutical Products. Analytical Letters, v. 49, n. 5, SI, p. 627-638, MAR 23 2016. (11/14413-0, 11/23498-9)

SASAKI, M. K.; RIBEIRO, D. S. M.; FRIGERIO, C.; PRIOR, J. A. V.; SANTOS, J. L. M.; ZAGATTO, E. A. G.. Chemiluminometric determination of ascorbic acid in pharmaceutical formulations exploiting photo-activation of GSH-capped CdTe quantum dots. LUMINESCENCE, v. 29, n. 7, p. 901-907, NOV 2014. (11/14413-0)

SASAKI, MILTON K.; ROCHA, DIOGO L.; ROCHA, FABIO R. P.; ZAGATTO, ELIAS A. G.. Tracer-monitored flow titrations. Analytica Chimica Acta, v. 902, p. 123-128, JAN 1 2016. (11/14413-0, 11/23498-9)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

SASAKI, Milton Katsumi. Comparison of flow analyzers exploiting constant or pulsed flows: application to samples of pharmaceutical, agronomical and/or environmental relevance. 2015. Doctoral Thesis - Universidade de São Paulo (USP). Centro de Energia Nuclear na Agricultura (CENA/STB) Piracicaba.