Data/hora: 10/06/2024 14:08:47

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