Data/hora: 22/06/2024 11:41:48

Biblioteca(s): | Embrapa Solos.
Data corrente: | 06/12/2017
Data da última atualização: | 11/11/2021
Autoria: | KOLLAR, S. R. M.; NOVOTNY, E. H.; NASCIMENTO, C. J. do; SUAREZ, P. A. Z.
Afiliação: | SARA R. M. KOLLAR, UnB; ETELVINO HENRIQUE NOVOTNY, CNPS; CLAUDIA J. DO NASCIMENTO, UNIRIO; PAULO A. Z. SUAREZ, UnB.
Título: | Nuclear magnetic resonance (1.40 T) and mid infrared (FTIR-ATR) associated with chemometrics as analytical methods for the analysis of methyl ester yield obtained by esterification reaction.
Ano de publicação: | 2017
Fonte/Imprenta: | Journal of the Brazilian Chemical Society, v. 28, n. 10, p. 1917-1925, out. 2017.
DOI: | http://dx.doi.org/10.21577/0103-5053.20170031
Idioma: | Inglês
Conteúdo: | In this work, we compared 1.40 T nuclear magnetic resonance (NMR) to 7.05 T (60 and 300 MHz for proton, respectively), and mid-infrared with attenuated total reflectance (FTIR&#8209;ATR), associated with chemometrics methods, for the quantification of the reaction yield during esterification of fatty acids with methanol. The results showed that the integrated intensities of the ester C=O stretching region, relative to the total C=O stretching region, is useful to quantify the fatty acid methyl ester (FAME) concentration. Comparing the results obtained by the different final models: NMR (1.40 T and 7.05 T), FTIR-ATR using multivariate partial last squares regression (PLS) with orthogonal signal correction (OSC), and univariate ordinary least squares (OLS), the NMR of 1.40 T (60 MHz for proton) showed more advantages when compared to a high field spectrometer, due to the non-use of cryogenic and solvents and less laborious work for obtaining results.
Palavras-Chave: | Esterificação; Infravermelho médio; Q-RMN; Quimiometria.
Thesaurus Nal: | biodiesel.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/168322/1/2017-079.pdf
Registro original: | Embrapa Solos (CNPS)
Exemplares: | CNPS - (19729-1) - UPC - AP - DD -  -  - 2017.00288 - DIS