Data/hora: 22/06/2024 06:55:28

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