Effect of different reaction parameters on the lipase-catalyzed selective acylation of polyhydroxylated natural compounds in ionic liquids

Katsoura, Maria H.; Polydera, Angeliki C.; Katapodis, Petros; Kolisis, Fragiskos N.; Stamatis, Haralambos

doi:10.1016/j.procbio.2007.07.004

Cited by 72 publications

(46 citation statements)

References 52 publications

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“…which is preferred due to its acceptance of a wide range of substrates, good catalytic activity and a high degree of regioselectivity Katsoura et al, 2006Katsoura et al, , 2007Ghoul et al, 2006;Mellou et al, 2005Mellou et al, , 2006Stevenson et al, 2006;Ardhaoui et al, 2004aArdhaoui et al, , 2004bArdhaoui et al, , 2004cPassicos et al, 2004;Moussou et al, 2004;Gayot et al, 2003;Ishihara et al, 2002;Kontogianni et al, 2001Kontogianni et al, , 2003Nakajima et al, 1999Nakajima et al, , 2003Gao et al, 2001;Otto et al, 2001;Danieli et al, 1997).…”

Section: Lipasesmentioning

confidence: 99%

“…Probably the most promising advantage of the use of ionic liquids is their potential application in food, pharmaceutical and cosmetic preparations due to their reduced toxicity (Jarstoff et al, 2003). Due to the many above-mentioned advantages of ionic liquids for enzyme-mediated transformations, several flavonoid esters have been recently www.intechopen.com prepared in such media (Katsoura et al, 2006(Katsoura et al, , 2007Kragl et al, 2006). The biocatalytic process showed significantly higher reaction rates, regioselectivity and yield conversions compared to those achieved in organic solvents.…”

Section: Solvent Referencementioning

confidence: 99%

See 1 more Smart Citation

Enzyme-Mediated Preparation of Flavonoid Esters and Their Applications

Viskupičová¹,

Ondrejovič²,

Maliar³

2012

Biochemistry

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Section: Lipasesmentioning

confidence: 99%

Section: Solvent Referencementioning

confidence: 99%

Enzyme-Mediated Preparation of Flavonoid Esters and Their Applications

Viskupičová¹,

Ondrejovič²,

Maliar³

2012

Biochemistry

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“…While lipases from many sources have been employed to date, the immobilized lipase Novozym 435 from C. antarctica is extremely robust and among the most effective and commonly used. With regards to the reaction system, synthesis of bioactive compounds has been carried out in organic solvent [23], solvent-free systems [24] as well as in novel media, such as room temperature ionic liquids (RTILs) [28]. In all of these systems, the major challenge lies in the bringing together of substrates (i.e.…”

Section: Designer Bioactive Compoundsmentioning

confidence: 99%

“…In all of these systems, the major challenge lies in the bringing together of substrates (i.e. hydrophilic flavonoid and hydro- 6 ) and trioctylmethyl-ammonium bis-(trifluoro-methylsulfonyl)imide (TOMA TF 2 N), both of which possess higher substrate solubilization capacities than many organic solvents [28]. Some other industrially important factors to consider include reaction temperature, substrate ratio, enzyme load, pH and water content of the system as well as the possibility of recovering/recycling the lipase.…”

Section: Designer Bioactive Compoundsmentioning

confidence: 99%

Enzymatic synthesis of designer lipids

Devi

Hong

Damstrup

et al. 2008

OCL

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“…By using the CCC design method, a total of 17 experiments (8 factorial points, 3 center points, and 6 star points) were required. Each experiment arranged at the center of experimental domain (i.e., run# 15-17) was repeated for three times in order to estimate the pure error (Katsoura et al, 2007). The analysis of variance (ANOV A) was used for analyzing the experimental data.…”

Section: Experimental Designmentioning

confidence: 99%

Development of novel oil recovery methods for petroleum refinery oily sludge treatment

Hu¹

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Oily sludge is one of the most significant wastes generated in the petroleum industry.It is a complex emulsion of various petroleum hydrocarbons (PHCs), water, metals, and fine solids. Due to its hazardous nature and increased generation quantities around the world, the effective treatment of oily sludge has attracted widespread attention. The complexity of its composition and diversity of its origin sources make oily sludge management a difficult and costly undertaking. Many methods have been developed for the treatment of oily sludge through oil recovery or sludge disposal approaches, but no single specific process can be considered as a panacea since each method is associated with different advantages and limitations. Efforts should focus on the improvement of current technologies and the combination of oil recovery with sludge disposal in order to comply with both resource reuse recommendations and environmental regulations. The object of this study was to develop novel combined methods for oil recovery treatment on different refinery oily sludges. The investigation focused on the oil recovery performance of combined methods based on four individual treatment processes including ultrasonic irradiation, solvent extraction, freeze/thaw, and pyrolysis in oily sludge treatment.Firstly, the oil recovery and salt removal effects of ultrasonic irradiation on oil refinery tank bottom sludge were investigated, together with those of direct heating.Ultrasonic power, treatment duration, sludge-to-water ratio, and initial sludge-water slurry temperature were examined for their impacts on sludge treatment. It was found that the increased initial slurry temperature could enhance the ultrasonic irradiation performance, especially at lower ultrasonic power level (i.e., 21 W), but the application of higher-power ultrasonic irradiation could rapidly increase the bulk temperature of slurry. Ultrasonic 2 irradiation had a better oil recovery and salt removal performance than direct heating treatment. More than 60% of PH Cs in the sludge was recovered at an ultrasonic power of 75 W, a treatment duration of 6 min, an initial slurry temperature of 25 °C, and a sludgeto-water ratio of 1 :4, while salt content in the recovered oil was reduced to <5 mg/L, thereby satisfying the salt requirement in refinery feedstock oil. In general, ultrasonic irradiation could be an effective method in terms of oil recovery and salt removal from refinery oily sludge, but the separated wastewater still contains relatively high concentrations of PH Cs and salt which requires proper treatment.Two types of ultrasonic assisted extraction (UAE) treatment including UAE probe (UAEP) system and UAE bath (UAEB) system were investigated for oil recovery from refinery oily sludge. Their oil recovery efficiencies were compared to that of mechanical shaking extraction (MSE). Three solvents including cyclohexane (CHX), ethyl acetate (EA), and methyl ethyl ketone (MEK) were examined as the extraction solvents. The influence of experimental factors on oil an...

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Effect of different reaction parameters on the lipase-catalyzed selective acylation of polyhydroxylated natural compounds in ionic liquids

Cited by 72 publications

References 52 publications

Enzyme-Mediated Preparation of Flavonoid Esters and Their Applications

Enzyme-Mediated Preparation of Flavonoid Esters and Their Applications

Enzymatic synthesis of designer lipids

Development of novel oil recovery methods for petroleum refinery oily sludge treatment

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