Data/hora: 09/06/2024 09:21:04

Provedor de dados: 	65	
País: 	Brazil	
Título: 	Comparing plastic syringes and disposable columns to extract n-alkanes in forage and concentrate feeds	
Autores: 	Oliveira,Dimas Estrasulas de; Tedeschi,Luis Orlindo.	
Data: 	2010-08-01	
Ano: 	2010	
Palavras-chave: 	Analysis; Digestibility; Intake; Hydrocarbons; N-alkane determination.	
Resumo: 	Saturated aliphatic hydrocarbons (n-alkanes) were extracted from feed, orts, and bovine fecal samples using disposable, plastic 5mL-syringes as an alternative material to disposable columns, which are normally used in the liquid-solid extraction phase of n-alkanes. For both methods, the n-alkane extracts (carbon chain length between 31 and 36 atoms) were identified using gas chromatography. The linear regression between methods were: 1) feces: column Alkane=2.63+0.92×syringeAlkane [r²=0.94, square root of the mean square error (RMSE)=13.7mg kg-1, n=30] from which the intercept and the slope did not simultaneously differ from zero and unity (P&gt;0.05), respectively; 2) feeds: column Alkane=0.36+1.12×syringeAlkane (r²=0.85, RMSE=1.9mg kg-1, n=21) from which the intercept and the slope did not simultaneously differ from zero and unity (P&gt;0.05), respectively; 3) orts: column Alkane=0.49+0.92×syringeAlkane (r²=0.98, RMSE=1.2mg kg-1, n=15) from which the intercept and the slope did not simultaneously differ from zero and unity (P&gt;0.05), respectively. Materials with low concentration of n-alkanes may affect the values obtained in both methods. These results suggested that disposable plastic syringes might be a viable alternative to columns thus, reducing analytical costs.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010000800029	
Editor: 	Universidade Federal de Santa Maria	
Relação: 	10.1590/S0103-84782010005000128	
Formato: 	text/html	
Fonte: 	Ciência Rural  v.40 n.8 2010	
Fonte: 	info:eu-repo/semantics/openAccess