determinação da pressão de vapor de compostos orgânicos por cromatografia gasosa determination of vapor pressure of organic compounds by gas chromatography

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ID: 146764
2006
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Abstract
O conhecimento das pressões de vapor dos compostos naturais e suas propriedades críticas, de grande interesse para a extração supercrítica e impregnação de polímeros pelo processo supercrítico, é imprescindível para se fazer a modelagem termodinâmica do equilíbrio de fases. No entanto, a escassez de dados experimentais desses compostos, devida à alta volatilidade, ou facilidade à degradação em temperaturas baixas, requer a utilização de métodos especiais. Neste trabalho, determinaram-se as pressões de vapor da curcumina, nicotina, d-limoneno, beta-mirceno, citronelal e linalol, através de um método que utiliza medidas de tempo de retenção por cromatografia gasosa. Utilizou-se detector de ionização de chama e coluna em fase estacionária não polar, em condições isotérmicas. O método apresenta vantagens em relação a outros métodos, quanto à rapidez de análise, quantidade e repetibilidade das amostras. Para as determinações das pressões de vapor destes compostos naturais requer-se o conhecimento da temperatura normal de ebulição, ou temperatura de fusão e das pressões de vapor dos homólogos dos compostos analisados.
The knowledge of the vapor pressures of natural compounds, as well as their critical properties are of great interest for the application of supercritical extraction and supercritical impregnation dye, and necessary for the thermodynamic modeling of equilibria phase. The scarcity of experimental data for these compounds results from their low volatility or easiness to degrade at low temperatures, therefore, requires the use of special methods. In this work, the vapor pressures of curcumin, nicotine, d-limonene, ß-myrcene, citronellal and linalool were determined through a method based on the retention time in a gas chromatographer column. A flame ionization detector and a column with non-polar stationary phase were used, under isothermal conditions. This method has the advantages of giving faster analysis, uses small size samples and shows good reproducibility. For the determination of the vapor pressure of these natural compounds, the normal boiling or fusion temperatures and the vapor pressures of the homologous series of these compounds is required.
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povh2006fooddeterminao Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Fabrício P. Povh;Vera M. Rodrigues;Maria A. A. Meireles;Nanci Pinheiro
Journal software - practice and experience
Year 2006
DOI
10.1590/S0101-20612006000200034
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612006000200034
Keywords
Gas chromatography

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