Head Space Solid Phase Micro-Extraction (HS - SPME) of volatile organic compounds produced by Sporidiobolus salmonicolor (CBS 2636)
The aim of the present study was the assessment of volatile organic compounds produced by Sporidiobolus salmonicolor (CBS 2636) using methyl and ethyl ricinoleate, ricinoleic acid and castor oil as precursors. The analysis of the volatile organic compounds was carried out using Head Space Solid Phas...
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Veröffentlicht in: | Ciência e tecnologia de alimentos 2010-12, Vol.30 (4), p.987-992 |
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Zusammenfassung: | The aim of the present study was the assessment of volatile organic compounds produced by Sporidiobolus salmonicolor (CBS 2636) using methyl and ethyl ricinoleate, ricinoleic acid and castor oil as precursors. The analysis of the volatile organic compounds was carried out using Head Space Solid Phase Micro-Extraction (HS - SPME). Factorial experimental design was used for investigating extraction conditions, verifying stirring rate (0-400 rpm), temperature (25-60 ºC), extraction time (10-30 minutes), and sample volume (2-3 mL). The identification of volatile organic compounds was carried out by Gas Chromatography with Mass Spectrum Detector (GC/MSD). The conditions that resulted in maximum extraction were: 60 ºC, 10 minutes extraction, no stirring, sample volume of 2.0 mL, and addition of saturated KCl (1:10 v/v). In the bio-production of volatile organic compounds the effect of stirring rate (120-200 rpm), temperature (23-33 ºC), pH (4.0-8.0), precursor concentration (0.02-0.1%), mannitol (0-6%), and asparagine concentration (0-0.2%) was investigated. The bio-production at 28 ºC, 160 rpm, pH 6,0 and with the addition of 0.02% ricinoleic acid to the medium yielded the highest production of VOCs, identified as 1,4-butanediol, 1,2,2-trimethylciclopropilamine, beta-ionone; 2,3-butanodione, pentanal, tetradecane, 2-isononenal, 4-octen-3-one, propanoic acid, and octadecane.
O objetivo do presente estudo foi avaliar os compostos orgânicos voláteis produzidos por Sporidiobolus salmonicolor (CBS 2636) utilizando metil e etil ricinoleato, ácido ricinoleico e óleo de mamona como precursores. A análise dos compostos voláteis produzidos foi conduzida por Micro-Extração em Fase Sólida (MEFS). A técnica de planejamento experimental foi utilizada na avaliação das condições de extração, na qual se avaliaram a agitação (0-400 rpm), a temperatura (25-60 ºC), o tempo de extração (10-30 minutos) e o volume da amostra (2-3 mL). A identificação dos compostos foi realizada por Cromatografia a Gás com detecção por Espectrometria de Massas (CG/EM). As condições que resultaram na máxima extração foram: 60 ºC, 10 minutos de extração, sem agitação, volume de amostra de 2,0 mL e adição de solução de KCl saturada (1:10 v/v). Na bioprodução dos compostos voláteis, o efeito da agitação (120-200 rpm), da temperatura (23-33 ºC), do pH (4,0-8,0), da concentração do precursor (0,02 a 0,1%), da concentração de manitol (0 a 6%) e de asparagina (0 a 0,2%) foi avaliado. Na condição de 28 ºC, 160 |
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ISSN: | 0101-2061 1678-457X 1678-457X |
DOI: | 10.1590/S0101-20612010000400023 |