Phase behavior of soybean oil, castor oil and their fatty acid ethyl esters in carbon dioxide at high pressures

Ndiaye, Papa M.; Franceschi, Elton; Oliveira, Débora de; Dariva, Cláudio; Tavares, Frederico W.; Oliveira, J. Vladimir

doi:10.1016/j.supflu.2005.08.002

Cited by 100 publications

(77 citation statements)

References 46 publications

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“…Actually, the comparable dielectric constants of nbutane and carbon dioxide (Habulin and Knez, 2001;Chen and Yang, 2000) and the higher pressure phase transition values generally found in systems formed of carbon dioxide with higher molecular weight compounds (e.g. triglycerides) than those found with the use of n-butane (Ndiaye et al, 2006) support a firm belief that n-butane may also be suitable as reaction medium for enzyme-catalyzed bioconversions. It should also be taken into account that to conduct enzyme-catalyzed reactions at high pressures the enzyme behavior in compressed fluids is of primary importance.…”

Section: Introductionmentioning

confidence: 93%

“…The experimental apparatus and procedure have been used in a variety of studies (Corazza et al, 2003;Franceschi et al, 2004;Ndiaye et al, 2006;Benazzi et al, 2006). Briefly, the experimental setup consists of a variable-volume view cell with two sapphire windows for visual observation, an absolute pressure transducer (Smar LD 301) with a precision of ±0.03 MPa, a portable programmer (Smar, HT 201) for pressure data acquisition and a syringe pump (ISCO 260D).…”

Section: Apparatus and Experimental Proceduresmentioning

confidence: 99%

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High-pressure cloud point data for the system glycerol + olive oil + n-butane + AOT

Bender¹,

Junges²,

Franceschi³

et al. 2008

Braz. J. Chem. Eng.

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-This work reports high-pressure cloud point data for the quaternary system glycerol + olive oil + n-butane + AOT surfactant. The static synthetic method, using a variable-volume view cell, was employed for obtaining the experimental data at pressures up to 27 MPa. The effects of glycerol/olive oil concentration and surfactant addition on the pressure transition values were evaluated in the temperature range from 303 K to 343 K. For the system investigated, vapor-liquid (VLE), liquid-liquid (LLE) and vapor-liquid-liquid (VLLE) equilibrium were recorded. It was experimentally observed that, at a given temperature and surfactant content, an increase in the concentration of glycerol/oil ratio led to a pronounced increase in the slope of the liquidliquid coexistence curve. A comparison with results reported for the same system but using propane as solvent showed that much lower pressure transition values are obtained when using n-butane.

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Section: Introductionmentioning

confidence: 93%

Section: Apparatus and Experimental Proceduresmentioning

confidence: 99%

High-pressure cloud point data for the system glycerol + olive oil + n-butane + AOT

Bender¹,

Junges²,

Franceschi³

et al. 2008

Braz. J. Chem. Eng.

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“…Nevertheless, carbon dioxide is not the only gas whose properties seem to be adequate for biocatalysis. For instance, the comparable dielectric constant of near critical propane to carbon dioxide (Habulin and Knez 2001) and the fact that much higher pressure phase transition values are generally found in systems formed by high-molecular weight (e.g., triglycerides) compounds when compared to the use of propane (Lanza et al 2005;Ndiaye et al 2006) support a firm belief that propane may also be suitable as reaction medium for enzyme-catalyzed bioconversions.…”

Section: Introductionmentioning

confidence: 98%

Effect of Treatment with Compressed Propane on Lipases Hydrolytic Activity

Franken

Marcon

Treichel

et al. 2008

Food Bioprocess Technol

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The objective of this work was to assess the influence of compressed propane treatment on the hydrolytic activity of three lipases (Amano PS, Amano AY30, and a non-commercial lipase from Yarrowia lipolytica) free, resuspended, and in immobilized form. To evaluate the effect of process variables on the lipase activity, a semifactorial experimental design with two levels and four variables was employed for free and immobilized lipases and a full 2 2 experimental design was carried out for lipases in solution. The residual activity was defined as the ratio of lipase activity before and after treatment with pressurized propane. For free and immobilized lipases, an enhancement in residual lipase activity in most of the experimental conditions investigated was observed. In the case of resuspended lipases, it is shown that enzyme kinetics is sensitive to treatment with compressed propane resulting in remarkable gains and losses of enzyme activity. In a general way, the results showed that the enzyme activity changes significantly depending on the enzyme, the presentation form, and the experimental conditions investigated, allowing the selection of operational conditions in terms of temperature, pressure, exposure time, and depressurization rate for advantageous application of these biocatalysts in hydrolysis reactions.

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“…triglycerides) compounds support a firm belief that propane may also be suitable as a reaction medium for enzyme-catalyzed bioconversions (HABULIN; KNEZ, 2001;CHEN;YANG, 2000). Besides, compared to higher homologue hydrocarbons and liquid solvents at ambient conditions, the use of propane offers the advantages of low separation costs and also solvent-free products (LANZA et al, 2005;NDIAYE et al, 2006a;NDIAYE et al, 2006b). …”

Section: Introductionmentioning

confidence: 99%

Fatty acid ethyl esters production using a non-commercial lipase in pressurized propane medium

Hildebrand¹,

Rosa²,

Freire³

et al. 2009

Ciênc. Tecnol. Aliment.

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Phase behavior of soybean oil, castor oil and their fatty acid ethyl esters in carbon dioxide at high pressures

Cited by 100 publications

References 46 publications

High-pressure cloud point data for the system glycerol + olive oil + n-butane + AOT

High-pressure cloud point data for the system glycerol + olive oil + n-butane + AOT

Effect of Treatment with Compressed Propane on Lipases Hydrolytic Activity

Fatty acid ethyl esters production using a non-commercial lipase in pressurized propane medium

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