Influence of Fatty Acid Methyl Ester Composition, Acid Value, and Water Content on Metallic Copper Corrosion Caused by Biodiesel

Rocha, José Geraldo; Santos, Marcelle D. R. dos; Madeira, Fernanda B.; Rocha, Sheisi F. L. S.; Bauerfeldt, Glauco F.; Silva, Willian L. G. da; Salomão, Acácia A.; Tubino, Matthieu

doi:10.21577/0103-5053.20190078

Cited by 3 publications

(2 citation statements)

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“…For example, high SFA content and a lack of PUFAs (i.e., a lower degree of unsaturation comparative to other strains) resulted in lower IV values. These properties generally indicate superior oxidative stability (Rocha Jr et al, 2019). However, allylic position equivalents (APE) and bis‐allylic position equivalents (BAPE) are better indicators of oxidative stability than IV (Knothe, 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Allylic sites are where a methylene (CH 2 ) group is located adjacent to one double bond. They are highly susceptible to oxidation, but bis‐allylic sites are even more susceptible due to the location of the methylene group between two double bonds (Rocha Jr et al, 2019). Given the lack of PUFAs in the Synechococcus strains, predicted OS values of zero (Table 3) are surprising.…”

Section: Discussionmentioning

confidence: 99%

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Nordic cyanobacterial and algal lipids: Triacylglycerol accumulation, chemotaxonomy and bioindustrial potential

Santana‐Sánchez

Lynch

Şirin

et al. 2021

Physiologia Plantarum

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The ability to capture and convert sunlight, water and nutrients into useful compounds make photosynthetic microbes ideal candidates for the bio-industrial factories of the future. However, the suitability of isolates from temperate regions to grow under Nordic conditions is questionable. In this work, we explore the chemotaxonomy of Nordic strains of cyanobacteria and one green alga and evaluate their potential as raw materials for the production of lipid-based bio-industrial compounds. Thin-layer chromatography was used to identify the presence of triacylglycerol, which were detected in the majority of strains. Fatty acid methyl ester profiles were analysed to determine the suitability of strains for the production of biodiesel or the production of polyunsaturated fatty acids for the nutraceutical industry. The Nordic Synechococcus strains were unique in demonstrating fatty acid profiles comprised mostly C14:0, C16:0 and C16:1 and lacking polyunsaturated fatty acids. These properties translated to superior predicted biodiesel qualities, including cetane number, cold filter plugging point and oxidative stability compared to the other evaluated strains. Polyunsaturated fatty acids were detected at high levels (38-53%), with Calothrix sp. 336/3 being abundant in two essential fatty acids, linoleic and alpha-linolenic acid (21 and 17%, respectively). Gamma-linoleic acid was the predominant polyunsaturated fatty acid for the remaining strains (13-21%). In addition to assessing the potential of Nordic strains for bio-industrial production, this work also discusses issues such as taxonomy and predictive modelling, which can affect the identification of prospective highperforming strains. | INTRODUCTIONCyanobacteria and green algae are oxygenic photosynthetic microorganisms able to adapt to and flourish in a diversity of environments.They utilise many protective mechanisms, such as lipid unsaturation, to adjust to changing environments. Lipids, being major components of membranes, play a key role in protecting the photosynthetic machinery against environmental stresses such as strong light, salt, and extremes in temperature (Los et al., 2013). The Nordic region is generally characterised by low temperatures, with long, dark winters contrasting short, bright summers (Ferro et al., 2020). Using strains adapted to such unique conditions may be advantageous in the pursuit of robust algal production systems (Cheregi et al., 2019). Indeed, Long-chain polyunsaturated fatty acids (PUFAs) have been found to Anita Santana-S anchez and Fiona Lynch contributed equally to this study.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Nordic cyanobacterial and algal lipids: Triacylglycerol accumulation, chemotaxonomy and bioindustrial potential

Santana‐Sánchez

Lynch

Şirin

et al. 2021

Physiologia Plantarum

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Optimization of base catalytic transesterification toward maximum biodiesel yield from Azolla filiculoides macroalgae feedstock

Ahmad

Senusi

Binhweel

et al. 2023

Industrial Crops and Products

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Effects of the Degree of Unsaturation of Fatty Acid Esters on Engine Performance and Emission Characteristics

Lin

2022

Processes

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Biodiesel is considered an environmentally friendly alternative to petro-derived diesel. The cetane number indicates the degree of difficulty in the compression-ignition of liquid fuel-powered engines. The allylic position equivalent (APE), which represents the unsaturated degree of fatty acid esters, was one of the key parameters for the cetane number of biodiesel. Due to the significant attributes of APE for biodiesel properties, the impact of APE on engine performance and emission characteristics was investigated in this study. The engine characteristics could be improved by adjusting the biodiesel fuel structure accordingly. A four-stroke and four-cylinder diesel engine accompanied by an engine dynamometer and a gas analyzer were used to derive the optimum blending ratio of the two biodiesels from soybean oil and waste cooking oil. Three fuel samples composed of various proportions of those two biodiesels and ultra-low sulfur diesel (ULSD) were prepared. The amounts of saturated fatty acids and mono-unsaturated fatty acids of the biodiesel made from waste cooking oil were significantly higher than those of the soybean-oil biodiesel by 9.92 wt. % and 28.54 wt. %, respectively. This caused a higher APE of the soybean-oil biodiesel than that of the biodiesel from waste cooking oil. The APE II biodiesel appeared to have the highest APE value (80.68) among those fuel samples. When the engine speed was increased to 1600 rpm, in comparison with the ULSD sample, the APE II biodiesel sample was observed to have lower CO and O2 emissions and engine thermal efficiency by 15.66%, 0.6%, and 9.3%, while having higher CO2 and NOx emissions, exhaust gas temperature, and brake-specific fuel consumption (BSFC) by 2.56%, 13.8%, 8.9 °C, and 16.67%, respectively. Hence, the engine performance and emission characteristics could be enhanced by adequately adjusting the degree of unsaturation of fatty acid esters represented by the APE of biodiesel.

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Influence of Fatty Acid Methyl Ester Composition, Acid Value, and Water Content on Metallic Copper Corrosion Caused by Biodiesel

Cited by 3 publications

References 24 publications

Nordic cyanobacterial and algal lipids: Triacylglycerol accumulation, chemotaxonomy and bioindustrial potential

Nordic cyanobacterial and algal lipids: Triacylglycerol accumulation, chemotaxonomy and bioindustrial potential

Optimization of base catalytic transesterification toward maximum biodiesel yield from Azolla filiculoides macroalgae feedstock

Effects of the Degree of Unsaturation of Fatty Acid Esters on Engine Performance and Emission Characteristics

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