Sample records for isobutyl alcohol
from WorldWideScience.org

Sample records 1 - 4 shown.



1

Teores de compostos orgânicos em cachaças produzidas na região norte fluminense - Rio de Janeiro/ Organic compounds contents in cachaças produced in the northern Rio de Janeiro State - RJ

Souza, Leandro Marelli de; Ferreira, Karla Silva; Passoni, Luís César; Bevitori, Alice Barreto; Melo, Karen Vieira; Viana, Arivaldo Ribeiro
2009-01-01

Resumo em inglês This work aimed to quantify some organic compounds in "cachaças" (sugar cane spirit). The ethyl alcohol was quantified by densimetry, after distillation. The acetic acid, methyl alcohol, n-propyl alcohol, n-butyl alcohol, isobutyl alcohol, isoamyl alcohol (mixture of 2-methyl-butyl and 3-methyl-butyl), ethyl acetate and acetaldehyde were determined by gas chromatography; and the furfural, 5-hydroxy-methylfurfural and acrolein by high efficiency liquid chromatography. Fro (mais) m the 30 samples analyzed, 63.3% showed non-conformity with national legislation regarding at least one of the analyzed components.

Scientific Electronic Library Online (Portuguese)

2

Distinção entre cachaças destiladas em alambiques e em colunas usando quimiometria/ Distinction between cachaças distilled in pot stills and in columns using chemometrics

Reche, Roni Vicente; Franco, Douglas Wagner
2009-01-01

Resumo em inglês One hundred fifteen cachaça samples derived from distillation in copper stills (73) or in stainless steels (42) were analyzed for thirty five itens by chromatography and inductively coupled plasma optical emission spectrometry. The analytical data were treated through Factor Analysis (FA), Partial Least Square Discriminant Analysis (PLS-DA) and Quadratic Discriminant Analysis (QDA). The FA explained 66.0% of the database variance. PLS-DA showed that it is possible to dis (mais) tinguish between the two groups of cachaças with 52.8% of the database variance. QDA was used to build up a classification model using acetaldehyde, ethyl carbamate, isobutyl alcohol, benzaldehyde, acetic acid and formaldehyde as chemical descriptors. The model presented 91.7% of accuracy on predicting the apparatus in which unknown samples were distilled.

Scientific Electronic Library Online (Portuguese)

3

Avaliação cromatográfica de compostos voláteis de cachaças produzidas com leveduras de diferentes procedências/ Chromatographic evaluation of volatile compounds in brazilian sugar cane spirits produced with yeasts from different locations

Silva, Paulo Henrique Alves da; Santos, Juliana de Oliveira; Araújo, Leandro Dias; Faria, Fernanda Carolina; Pereira, Alexandre Fontes; Oliveira, Valdinéia Aparecida de; Vicente, Maristela de Araújo; Brandão, Rogélio Lopes
2009-03-01

Resumo em português Procurou-se neste trabalho produzir cachaças em escala de laboratório a partir de leveduras isoladas de alambiques de diferentes regiões de Minas Gerais, avaliando-se e comparando-se a composição química destas em relação a cachaças de marcas comerciais. Os alambiques selecionados para isolamento das leveduras produzem tradicionalmente cachaças com características artesanais, cujos procedimentos as diferenciam sensorial e quimicamente das cachaças industriais. (mais) Avaliou-se a cinética de algumas das fermentações com relação ao teor alcoólico e à acidez produzidos durante a fermentação e alguns mostos atingiram concentrações de etanol da ordem de 9 ºGL e acidez de 55 mg.100 mL-1. Os compostos avaliados por cromatografia gasosa foram acetaldeído, acetato de etila, metanol, 1-propanol, álcool isobutílico, álcool isoamílico, furfural e ácido acético. As concentrações mais elevadas foram de alcoóis superiores totais, preponderando o álcool isoamílico, e de ácido acético. A composição mostrou-se bastante variável (40,59 a 671,86 mg de ácido acético.100 mL-1 de álcool anidro e 20,68 a 178,6 mg de acetaldeído.100 mL-1 de álcool anidro), e foi contrastada com os limites legais estabelecidos pela legislação brasileira (Instrução Normativa nº 13, de 30/06/2005, do Ministério da Agricultura, Pecuária e Abastecimento). Resumo em inglês The aim of this study was to produce Brazilian sugar cane spirits (cachaça) in a laboratory scale using yeasts isolated from distilleries of different regions in Minas Gerais state evaluating and comparing their chemical composition to those of commercial brands of cachaça. The selected distilleries are from the segment of cachaça artisanal production, which includes different sensorial and chemical procedures from the ones produced in an industrial scale. Some kinetic (mais) processes were evaluated analyzing the alcoholic content and acidity produced during fermentation. Some fermenting musts showed 9 ºGL of ethanol and 55 mg.100 mL-1 of acidity. The compounds analyzed by gas chromatography were acetaldehyde, ethyl acetate, methanol, 1-propanol, isobutyl alcohol, isoamyl alcohol, furfural, and acetic acid. The concentration of the total higher alcohols were the greatest, mainly the isoamyl alcohol (the, highest) and acetic acid. The chemical profiles of the cachaças varied considerably (40,59 to 671,86 mg of acetic acid.100 mL-1 anhydrous alcohol and 20,68 to 178,6 mg of acetaldehyde.100 mL-1 anhydrous alcohol) and all compositions were contrasted with the legal standards of the Brazilian legislation.

Scientific Electronic Library Online (Portuguese)

4

Análise dos álcoois, ésteres e compostos carbonílicos em amostras de óleo fúsel/ Analysis of the alcohols, esters and carbonyl compounds in fusel oil samples

Pérez, Eduardo R.; Cardoso, Daniel R.; Franco, Douglas W.
2001-02-01

Resumo em inglês Analysis of alcohols, esters and carbonyl compounds were performed using HRGC and HPLC techniques in samples of fusel oils from three different Brazilian alcohol distilleries. High content of isoamyl alcohol (390 g.L-1), isobutyl alcohol (158 g.L-1), ethyl alcohol (28,4 g.L-1), methyl alcohol (16,6 g.L-1) and n-propyl alcohol (11,9 g.L-1) were found. These compounds represent 77 ± 8 % of the approximated weight of a liter of fusel oils. The obtained results show the feasibility of using fusel oils as low-cost raw material for the synthesis of chemicals.

Scientific Electronic Library Online (Portuguese)