Utilização do índice de retenção linear para caracterização de compostos voláteis em café solúvel utilizando GC-MS e coluna HP-Innowax

Viegas, Marcelo Caldeira; Bassoli, Denisley Gentil

doi:10.1590/s0100-40422007000800040

Cited by 37 publications

(17 citation statements)

References 4 publications

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“…Quantitative analysis of aroma compounds for all samples was carried out in triplicate using the method described in Viegas and Bassoli (2007). Coffee volatile compounds were sampled with solid phase microextraction (SPME) at 70°C during 30 min using a PDMS (Supelco, Switzerland) fiber.…”

Section: Sample Analysismentioning

confidence: 99%

Concentration of aroma compounds from an industrial solution of soluble coffee by pervaporation process

Weschenfelder

Lantin

Viegas³

et al. 2015

Journal of Food Engineering

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a b s t r a c tPervaporation experiments with PDMS membrane have been performed in a plate and frame module to investigate its ability to concentrate volatile compounds identified in an industrial soluble coffee solution. Eight compounds were chosen to depict key aroma of soluble coffee. The effect of feed flow rate, temperature and permeate pressure on the pervaporation performance has been analyzed. Concentration polarization phenomena was not identified in the feed flow rate studied. The temperature effect showed a good agreement with the nonlinear Arrhenius equation. The permeate pressure followed the solution-diffusion model behavior. Results showed that pervaporation is a promising alternative to concentrate aroma compounds from soluble coffee.

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Section: Sample Analysismentioning

confidence: 99%

Concentration of aroma compounds from an industrial solution of soluble coffee by pervaporation process

Weschenfelder

Lantin

Viegas³

et al. 2015

Journal of Food Engineering

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“…The mass spectrometer was programed to range from 40 to 700 mass units. Linear retention indices (LRIs) were determined as previously described by Viegas and Bassoli . Compounds were identified by comparison of mass fragmentation patterns with mass spectra of NIST 08 Library and LRIs with literature data …”

Section: Methodsmentioning

confidence: 99%

Composition of the volatile fraction of a sample of Brazilian green propolic and its phytotoxic activity

Fernandes-Silva

Lima

Negri

et al. 2015

J. Sci. Food Agric.

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“…Each experiment was performed in triplicate. Linear retention index (LRI) of the compounds, 29,30 standards co-injection and comparison with NIST 2008 library database were used to confirm compound identity.…”

Section: Solid Phase Microextraction (Spme)mentioning

confidence: 99%

Generation of Volatile Compounds from Carotenoids ofDunaliella bardawilAlgae by Water Bath Heating and Microwave Irradiation

Tinoco¹,

Uekane²,

Tsukui³

et al. 2016

Journal of the Brazilian Chemical Society

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The volatile compounds formed by thermal degradation of the carotenoids present in Dunaliella bardawil were investigated by microwave irradiation (MW) and water bath heating (WB) in different conditions of temperature and time using central composite design. Volatiles extraction by solid phase microextraction (SPME) was optimized and performed at 40 °C for 15 minutes, and those in greater amount were quantified by a validated method of gas chromatography coupled to a quadrupole mass spectrometer (GC-qMS). Employing WB, 10, 12 and 120 ng mL -1 of β-cyclocitral, α-ionone e β-ionone, respectively, were obtained between 60 and 87 °C for 30-75 min, while by MW, 5, 5, 50 ng mL -1 were obtained between 75-107 °C for 1.5-2.8 min. Considering the shorter time of MW, it can be concluded that if the time necessary to obtain the best yield by WB is employed in multiple MW cycles, an amount 10 times greater of those compounds would be obtained by MW than by WB. The results suggest a new biotechnology application for the carotenoids of the microalgae of the Dunaliella genus. Keywords: Dunaliella bardawil, β-cyclocitral, ionone, carotenoid, microwave, water bath IntroductionMicroalgae are photosynthetic microorganisms widely distributed in marine, freshwater and terrestrial ecosystems.1,2 They produce a great diversity of compounds with high commercial value, such as polyunsaturated fatty acids, carotenoids, phycobilins, polysaccharides, vitamins and sterols. [3][4][5][6][7] The production of microalgae supplies the cosmetic and food supplement industries, and boosts the development of natural food products, an emerging and promising field for industrial application.8 Microalgae have properties typical of higher plants (efficient oxygenic photosynthesis and simplicity of nutritional requirements), but also biotechnological attributes of microbial cells (rapid growth in culture medium and capacity to accumulate or secrete metabolites of interest), 4 supporting large scale applications.Among the microalgae used to obtain carotenoids, two species of the genus Dunaliella, D. bardawil and D. salina stand out for the production of β-carotene in their chloroplasts. 9 The accumulation capacity of β-carotene in Dunaliella is influenced by stress factors in culture, such as high light intensity and salt concentration, low temperatures and/or nitrate deficiency. 10 Studies reported in the literature aimed at increasing the production of carotenoids in Dunaliella showed that its concentration varies in a range between 4 and 38 µg mL -1 . 11-14Herrero et al. 15 evaluated the chemical composition and antimicrobial activity of the pressurized extract of D. salina. Norisoprenoids such as α-ionone, β-ionone and β-cyclocitral, besides neophytadiene and phytol were observed, as well as antimicrobial activity associated to volatiles. Previously, Larrouche et al. 16 showed that β-ionone inhibits the respiratory chain, preventing microbial oxygen consumption.Norisoprenoids can be formed from carotenoids by external agents such as temperature, light...

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Utilização do índice de retenção linear para caracterização de compostos voláteis em café solúvel utilizando GC-MS e coluna HP-Innowax

Cited by 37 publications

References 4 publications

Concentration of aroma compounds from an industrial solution of soluble coffee by pervaporation process

Concentration of aroma compounds from an industrial solution of soluble coffee by pervaporation process

Composition of the volatile fraction of a sample of Brazilian green propolic and its phytotoxic activity

Generation of Volatile Compounds from Carotenoids ofDunaliella bardawilAlgae by Water Bath Heating and Microwave Irradiation

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