@misc{10481/82334,
year = {2023},
month = {5},
url = {https://hdl.handle.net/10481/82334},
abstract = {The increasing production and extensive use of biodiesel in the latest years call for the development of fast and cost-effective procedures for point-of-care analysis. One of the main quality parameters is the biodiesel content in diesel blends, which needs to conform to regional legislations. In this work, a microfluidic device exploiting chemical derivatization of alkyl esters and detection by smartphone-based digital-image colorimetry was developed. It was designed to ensure proper experimental conditions for chemical derivatization, including re- agent release, and photometric measurements. Analytes reacted with alkaline hydroxylamine yielding the cor- responding alkyl hydroxamates, measured as colored Fe(III) complexes. Analytical response was based on the measurement of the G (green) channel from RGB color system. By taking methyl linoleate as a model compound, a linear response was obtained from 0.1% to 0.6%(v/v) (Analytical signal = 69.6 +2.1 C, r = 0.999), coefficient of variation (n = 10) of 4.0% and limit of detection (99.7% confidence) of 0.04%(v/v). Procedure consumes 1.2 µL of sample, 230 µg of hydroxylamine, 480 µg of NaOH, 14 µg of Fe(III) and equivalent to 1.2 µL of 69%(v/v) HNO3. Accurate results were achieved in relation to the MIR reference method, with agreement at the 95% confidence level},
organization = {The authors gratefully acknowledge the financial support from Fundaç˜ao de Amparo `a Pesquisa do Estado de S˜ao Paulo FAPESP (proc. 2021/12242–5 and 2018/07687–5). and the support from the Spanish “Ministerio de Economía y Competitividad” (Project PID2019–103938RB- I00) and Junta de Andalucía (Projects B-FQM-243-UGR18 and P18-RT- 2961).},
keywords = {Microfluidics},
keywords = {Digital image colorimetry},
keywords = {Quality control},
keywords = {Alkyl esters content},
keywords = {Renewable fuel},
keywords = {Diesel blends},
title = {A cost-effective microfluidic device for determination of biodiesel content in diesel blends},
doi = {10.1016/j.snb.2023.134033},
author = {Soares, Samara and Ramos Lorente, Celia Esperanza and Rocha, Fabio R.P. and Erenas Rodríguez, Miguel María and Orbe Payá, Ignacio De and López Ruiz, Nuria and Capitán Vallvey, Luis Fermín},
}