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Exploitation of novel calibration strategies, digital images and flow analysis for biodiesel quality control

Grant number: 18/07687-5
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): July 01, 2018
Effective date (End): March 31, 2023
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
Principal Investigator:Fábio Rodrigo Piovezani Rocha
Grantee:Samara Soares
Host Institution: Centro de Energia Nuclear na Agricultura (CENA). Universidade de São Paulo (USP). Piracicaba , SP, Brazil
Associated research grant:11/23498-9 - Advanced flow systems for technological, agronomical and environmental analysis, AP.TEM
Associated scholarship(s):21/12242-5 - Development of a cost-effective microfluidic device to determine biodiesel content in diesel blend, BE.EP.DR


Biodiesel is produced from renewable sources, such as vegetable oils or animal fats, which cause lower impact on the emission of greenhouse gases. In Brazil, this biofuel is commercialized as blends with diesel in the amount of 10% (v/v) since March 2018. Because of the high demand for biodiesel and the variety of raw materials used for its production, simple, fast, and reliable analytical procedures are required for quality control. However, most official methods are time-consuming and require high amounts of toxic solvents. On the other hand, alternative procedures are often prone to matrix effects. In this context, this project proposes the evaluation of different analytical strategies, involving novel alternatives for calibration, exploitation of digital images and flow analysis for the development of simpler and fast procedures, which should be suitable for in situ analyses and to circumvent matrix effects. Based on digital images and colorimetric reactions, it is proposed the development of a paper-based spot test to quantify biodiesel in blends with diesel, and differentiation maps involving the main parameters for biodiesel quality control. These alternatives ought to minimize the amounts of reagents and solvents and show characteristics suitable for in situ analysis. With the same purpose, it is proposed the development of a flow-based spectrophotometric procedure by exploiting the lab-in-syringe approach to quantify methanol residues in biodiesel. Calibration strategies (especially multi-energy calibration) will be investigated to circumvent matrix effects in the determination of iodine value, free glycerol, and water content in biodiesel samples from different sources. The analytical performance will be critically evaluated by comparison with those obtained in the reference procedures. (AU)

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Scientific publications (13)
(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)
SOARES, SAMARA; FERNANDES, GABRIEL M.; MORAES, LIZ M. B.; BATISTA, ALEX D.; ROCHA, FABIO R. P.. Single-phase determination of calcium and magnesium in biodiesel using smartphone-based digital images. FUEL, v. 307, . (18/07687-5)
MARTINS, LUIS CLAUDIO; SOARES, SAMARA; ROCHA, FABIO R. P.. Digital-image eco-friendly spot test with liquid-liquid microextraction for selective determination of flavonols in berries. Microchemical Journal, v. 193, p. 7-pg., . (18/07687-5, 21/02309-5)
MARTINS, LUIS CLAUDIO; SOARES, SAMARA; ROCHA, FABIO R. P.. Digital-image photometry and salting-out assisted liquid-liquid microextraction for determination of flavonols in berries. Journal of Food Composition and Analysis, v. 123, p. 7-pg., . (18/07687-5, 21/02309-5)
SOARES, SAMARA; DONATI, GEORGE L.; ROCHA, PABIO R. P.. Digital-image photometry with multi-energy calibration. Microchemical Journal, v. 182, p. 7-pg., . (18/07687-5)
SOARES, SAMARA; CAMPOS, KAROLINE R. R.; MELCHERT, WANESSA R.; ROCHA, FABIO R. P.. A spot test for total esters determination in sugarcane spirits exploiting smartphone-based digital images. ANALYTICAL METHODS, v. 12, n. 31, p. 3918-3923, . (18/07687-5, 18/24029-1)
SOARES, SAMARA; RAMOS-LORENTE, CELIA E.; RUIZ-GARCIA, ISIDORO; ROCHA, FABIO R. P.; ERENAS, MIGUEL M.; DE ORBE-PAYA, IGNACIO; LOPEZ-RUIZ, NURIA; CAPITAN-VALLVEY, LUIS F.. A cost-effective microfluidic device for determination of biodiesel content in diesel blends. SENSORS AND ACTUATORS B-CHEMICAL, v. 390, p. 7-pg., . (21/12242-5, 18/07687-5)
SOARES, SAMARA; MORAES, LIZ MARY B.; ROCHA, FABIO R. P.; VIRGILIO, ALEX. Sample preparation and spectrometric methods for elemental analysis of milk and dairy products - A review. Journal of Food Composition and Analysis, v. 115, p. 26-pg., . (18/07687-5, 21/01912-0)
GONCALVES, ISABELA CAMARGO; SOARES, SAMARA; ROCHA, FABIO R. P.. Exploiting microdistillation and smartphone-based digital-image colorimetry for determination of protein in foods. Microchemical Journal, v. 188, p. 6-pg., . (21/02590-6, 18/07687-5)
SOARES, SAMARA; TORRES, KETHENY G.; PIMENTEL, EDUARDO L.; MARTELLI, PATRICIA B.; ROCHA, FABIO R. P.. A novel spot test based on digital images for determination of methanol in biodiesel. Talanta, v. 195, p. 229-235, . (18/07687-5)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
SOARES, Samara. Calibration strategies, digital images and microfluidic device for quality control of biodiesel. 2023. Doctoral Thesis - Universidade de São Paulo (USP). Centro de Energia Nuclear na Agricultura (CENA/STB) Piracicaba.

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