Transesterification of sunflower oil in situ

Šiler-Marinković, Slavica; Tomašević, Anđelka

doi:10.1016/s0016-2361(98)00028-3

Cited by 131 publications

(63 citation statements)

References 8 publications

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“…Fabbri et al (2007) reported 5 h of reaction with MeO-Na as a catalyst in reacting dimethyl carbonate with soybean oil to produce biodiesel, while Diasakou et al (1998) reported that, without a catalyst, methyl esterification of soybean oil required 10 h to get 85 % yield at 235 °C. Furthermore, Marinkovic and Tomasevic (1998) reported to need 3 h reaction, with acid catalyst, to obtain a similar result.…”

Section: Yield Of Fame From Rapeseed Oil Treated With Supercritical Dmentioning

confidence: 88%

Dimethyl carbonate as potential reactant in non-catalytic biodiesel production by supercritical method

Ilham

Saka

2009

Bioresource Technology

108

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In this study, the non-catalytic supercritical method has been studied in utilizing dimethyl carbonate. It was demonstrated that, the supercritical dimethyl carbonate process without any catalysts applied, converted triglycerides to fatty acid methyl esters with glycerol carbonate and citramalic acid as by-products, while free fatty acids were converted to fatty acid methyl esters with glyoxal. After 12 min of reaction at 350 °C/20 MPa, rapeseed oil treated with supercritical dimethyl carbonate reached 94% (w/w) yield of fatty acid methyl ester. The by-products from this process which are glycerol carbonate and citramalic acid are much higher in value than glycerol produced by the conventional process. In addition, the yield of the fatty acid methyl esters as biodiesel was almost at par with supercritical methanol method. Therefore, supercritical dimethyl carbonate process can be a good candidate as an alternative biodiesel production process.

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Section: Yield Of Fame From Rapeseed Oil Treated With Supercritical Dmentioning

confidence: 88%

Dimethyl carbonate as potential reactant in non-catalytic biodiesel production by supercritical method

Ilham

Saka

2009

Bioresource Technology

108

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“…The transesterification of total lipid was performed as described by Marinkovic and Tomasevic (1998), with little modification. In brief, the cell pellet was re-suspended in 5% of sulfuric acid and methanol (V/V), followed by vigorous vortex for 30 s, and kept in a water bath for 2 h at 90°C, then allowed to cool.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Major Lipid Body Protein: A Conserved Structural Component of Lipid Body Accumulated during Abiotic Stress in S. quadricauda CASA-CC202

et al. 2016

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Abiotic stress in oleaginous microalgae enhances lipid accumulation, which is stored in a specialized organelle called lipid droplets (LDs). Both the LDs or lipid body are enriched with major lipid droplet protein (MLDP). It serves as a major structural component and also plays a key role in recruiting other proteins and enzymes involved in lipid body maturation. In the present study, the presence of MLDP was detected in two abiotic stress condition namely nitrogen starvation and salt stress condition. Previous research reveals that nitrogen starvation enhances lipid accumulation. Therefore, the effect of salt on growth, biomass yield, and fatty acid profile is studied in detail. The specific growth rate of Scenedesmus quadricauda under the salt stress of 10mM concentration is about 0.174 μ and in control, the SGR is 0.241 μ. An increase in the doubling time of the cells shows that the rate of cell division decreases during salt stress (2.87-5.17). The dry biomass content also decreased drastically at 50mM salt-treated cells (129 mg/L) compared to control (236 mg/L) on the day 20. The analysis of fatty acid composition also revealed that there is a 20% decrease in the saturated fatty acid level and 19.9% increment in monounsaturated fatty acid level, which makes salt-mediated lipid accumulation as a suitable biodiesel precursor.

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“…While, comparing the performance of classical homogeneous acid catalyst with the enzymatic catalysis results, it is possible to notice that a very high amount of alcohol is necessary in order to avoid the use of higher temperature [16]. This aspect strongly reduces the environmental benefit of bio-fuel production.…”

Section: Comparison With Some Homogeneous and Heterogeneous Catalystsmentioning

confidence: 99%

Pure silica nanoparticles for liposome/lipase system encapsulation: Application in biodiesel production

et al. 2013

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In this work we report the synthesis of organic-inorganic solid with spherical morphology where enzyme, as active compounds, is encapsulated. The organic phase of nanospheres is composed of L-α-phosphatidylcholine, as liposome, and Lipase from Rhizomucor miehei, as enzyme. The organic phase is covered with porous inorganic silica shell that could stabilize the internal liposomal phase and, consequently, isolate and protect the bioactive molecules. The liposome and silica amount used during the immobilization procedure have been optimized in order to obtain active and stable heterogeneous biocatalyst. Hybrid-nanospheres containing the enzyme were used to catalyze the transesterification reaction of triolein with methanol to methyl esters, typical biodiesel mixture compounds. The encapsulated enzyme retains its activity after 5 reaction cycles. The total productivity of the best catalyst obtained is higher than that of the free enzyme. Answer to CommentsReviewer #1: The authors in the article described a new method of preparation of encapsulated active biomolecules. The lipase enzymes in silica nanoparticles are catalytical more active for the transesterification reaction than free enzymes, even after 5 reaction cycles. I recommend the article for publication in Catalysis Today.A: We want to thank the reviewer for the revision.Reviewer #2: The paper deals with an interesting topic and merits to be published in Catalysis Today. However, the following comments should be taken into account prior to final acceptance of the manuscript:A: We have appreciated very much all the suggestions made by the reviewer. They have entailed important improvements of the manuscript. Main comments:Q1: What is the productivity compared with classical homogeneous catalysts and some heterogeneous catalysts reported in literature? Please provide a comparison.A1: In order to make this comparison, we have introduced another paragraph, "Comparison with some homogeneous and heterogeneous catalysts", where we have compared the best performance of some heterogeneous catalysts and the classical homogeneous catalysts (basic, KOH, and acid, H 2 SO 4 ). Unfortunately, we don't have the productivity values for all these catalysts and, in any case, the tested enzyme amount and the number of reaction cycles should be the same, in order to make a good comparison. Therefore we have compared the overall catalytic performance. To do this comparison, we have inserted some references (from 15 to 19). Q2: What is the reason for the rapid drop in activity after the fifth cycle? Please explain it in the text.A2: Most probably, the main reason of the rapid drop of the enzyme activity after the fifth cycle should be the denaturation of the same enzyme, together with the inevitable leaching. We have introduced this consideration in the text, section 3.3 Transesterification reaction results, lines 54-55. *Detailed Response to ReviewersQ3: It is said: "The possibility to use cheaper feedstock requires alternative catalysts instead of the homogeneous basi...

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Transesterification of sunflower oil in situ

Cited by 131 publications

References 8 publications

Dimethyl carbonate as potential reactant in non-catalytic biodiesel production by supercritical method

Dimethyl carbonate as potential reactant in non-catalytic biodiesel production by supercritical method

Major Lipid Body Protein: A Conserved Structural Component of Lipid Body Accumulated during Abiotic Stress in S. quadricauda CASA-CC202

Pure silica nanoparticles for liposome/lipase system encapsulation: Application in biodiesel production

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