Thermal behavior of ferulic acid employing isoconversional models and artificial neural network

Autor:	Luana Guedes Brito, Wagner da Nova Mussel, Geovana Quixabeira Leite, Fernando Henrique Andrade Nogueira, Ana Paula Barreto Gomes, Rita C. O. Sebastião, Maria Irene Yoshida, Bárbara D. L. Ferreira, Cícero Flávio Soares Aragão, Elissa Arantes Ostrosky, Fernanda Ílary Costa Duarte, Ádley Antonini Neves de Lima, Maria Betânia de Freitas Marques, Márcio Ferrari
Rok vydání:	2019
Předmět:	Work (thermodynamics) Chemistry Kinetics Thermal decomposition Thermodynamics 02 engineering and technology Activation energy Phenolic acid 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Decomposition Isothermal process 010406 physical chemistry 0104 chemical sciences Ferulic acid chemistry.chemical_compound Physical and Theoretical Chemistry 0210 nano-technology
Zdroj:	Journal of Thermal Analysis and Calorimetry. 138:3715-3726
ISSN:	1588-2926 1388-6150
DOI:	10.1007/s10973-019-08114-x
Popis:	Ferulic acid (FA) is a phenolic acid of plant kingdom presenting antioxidant activity, a fundamental pharmaceutical property. This property suggests FA can be used in cosmetic skin formulations as a photoprotective and anti-aging agent. The purpose of this work is to investigate the kinetics of FA thermal decomposition process in non-isothermic conditions applying Friedman, Flynn–Wall–Ozawa and Kissinger–Akahira–Sunose methodologies and in isothermal conditions using a neural network. All these isoconversional results showed coherent values of apparent activation energy under nitrogen atmosphere. For the isothermal analysis, R2 model presented best performance to individually describe the data. However, the neural network assumed the decomposition as a combined event, in which ten models have contributions to describe experimental data. The DRX results showed the sample is not at steadier configuration and require a pre-treatment before the analysis by the non-isothermal experiments. From this, the sample was prepared with heat treatment up to 130 °C, and the determined activation energy showed reduction of 5 kJ mol−1. The isothermal analysis endorses activation energy about 40 kJ mol−1. These results proved the FA thermal decomposition is strongly influenced by experimental conditions.
Databáze:	OpenAIRE
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