Oxidative stability of biodiesels produced from vegetable oils having different degrees of unsaturation

Pantoja, Samantha Siqueira; Conceição, Leyvison Rafael Vieira da; Costa, Carlos Emmerson Ferreira da; Zamian, José Roberto; Filho, Geraldo Narciso da Rocha

doi:10.1016/j.enconman.2013.05.025

Cited by 72 publications

(37 citation statements)

References 17 publications

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“…Refractive index and iodine value refer to the degree of unsaturation of vegetable oils. Additionally, refractive index might indicate the presence of impurities such as processing waste . Accordingly, there were no differences in both values between ethanol‐ and ether‐extracted jussara oils.…”

Section: Resultsmentioning

confidence: 89%

“…Both jussara oils presented refractive index similar to those observed for olive oil (1.469) and açai oil (1.481) . Additionally, the iodine value of ethanol‐ and ether‐extracted jussara oils (109.8) was higher than that of açai oil (61.8) , probably due to the higher content of unsaturated fatty acids in jussara oils. Consistently, jussara fruit oils showed high contents of unsaturated fatty acids, and a similar fatty acid composition to açai and virgin olive oils .…”

Section: Discussionmentioning

confidence: 90%

“…Regarding tocopherol composition, ethanol-extracted jussara oil presented higher contents than virgin olive oil (16.8-30.7 mg/100 g) [36] and crude oils of Brazil-nut (8.29 mg/100 g), hazelnut (31.0 mg/100 g), cashew (0.36 mg/100 g), and almond (44.0 mg/100 g) [32]. Additionally, jussara oils presented b-tocopherol contents similar to oils that are considered food sources for this tocol, such as crude corn (35.0 mg/100 g) and palm (23.4 mg/100 g) oils [31]. In contrast, low contents of g-tocopherol were found in both jussara oils.…”

Section: Discussionmentioning

confidence: 93%

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Ethanol extraction renders a phenolic compounds‐enriched and highly stable jussara fruit (Euterpe edulis M.) oil

Silva

Castelo-Branco

Carvalho

et al. 2017

Euro J Lipid Sci & Tech

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The aims of the present study were to investigate the effect of extraction solvent, using either ethanol or petroleum ether, on the chemical profile and chemical stability of jussara oil. Jussara fruit oil presented high contents of antioxidant compounds, including anthocyanins. Extraction solvent significantly affected the chemical composition of the jussara oils, except for fatty acids and carotenoids, from which oleic acid and β‐carotene, respectively, were predominant in both. Ethanol‐extracted jussara oil showed higher contents of tocopherols (α, β, and γ), chlorophylls, and phenolic compounds, especially anthocyanins. Moreover, ethanol‐extracted jussara oil presented higher oxidative stability and total antioxidant capacity than petroleum ether‐extracted jussara oil. Because of its composition, jussara oil might present potential health benefits. Additionally, the use of the low‐toxicity solvent ethanol to extract oil seems to be an important technique to afford jussara oil with improved nutritional properties and oxidative stability. Practical applications: Value‐added oil was obtained from the jussara fruit (Euterpe edulis), containing, in addition to triacylglycerols, phenolic acids, anthocyanins, tocopherols, β‐carotene, and chlorophyll. Ethanol‐extracted jussara oil was highly stable, due to the high contents of antioxidants. Ethanol extraction proved to be a highly effective mean to obtain value‐added jussara fruit oil. Ethanol and petroleum ether are used to extract jussara oil. Ethanol‐extracted jussara oil is highly stable, as a consequence of the high contents of tocopherols and phenolic compounds, including anthocyanins.

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Section: Resultsmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 93%

See 1 more Smart Citation

Ethanol extraction renders a phenolic compounds‐enriched and highly stable jussara fruit (Euterpe edulis M.) oil

Silva

Castelo-Branco

Carvalho

et al. 2017

Euro J Lipid Sci & Tech

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“…The only oil that showed a peroxide value greater than that of M. pubescens was acai (177.1 meq·kg -1 ) ( Table 3). The peroxide value is related to storage time, temperature, exposure to light, foreign materials, the extraction process used to extract the oil, and may also vary depending on the origin of seeds used in the extraction process (Almeida et al, 2013;Mata et al, 2011;Pantoja et al, 2013;Sidibé et al, 2010).…”

Section: Acidity Level Peroxide Value and Moisture Contentmentioning

confidence: 99%

Magonia pubescens (Sapindaceae) Seed Oil: Physical and Chemical Properties, Fatty Acid Profile and Biodiesel Production

Rocha¹,

Menezes²,

Fonseca³

et al. 2017

JAS

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Magonia pubescens is a tree species originally from the Brazilian Cerrado that bears fruit with winged seeds from which fixed oil can be extracted. This study aimed to analyze the physical and chemical properties of the oil extracted from these seeds and the biodiesel produced thereof. Methods from the Adolfo Lutz Institute, American Oil Chemists Society, and American Society for Testing and Materials were used. Seven fatty acids (oleic, arachidic, gadoleic, palmitic, palmitoleic, linoleic, and stearic acids) were found in the oil. ).

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“…It is clearly demonstrated that the adsorbed copolymer layer can be removed from the surface by means of a simple surface cleaning process ( Figure 13 left) while those lubricated by the VO/W emulsions still have residue on the surface (Figure 13 right). While vegetable oils tendency to produce ROOH hydroperoxide through oxidation results in thickening, varnish formation and sludge deposition on surfaces [26,63] and postulates poor cleanability, triblock copolymers have high wetting and spreading ability, thus are easily rinsed with Milli-Q water [8,20]. This direct observation, together with the QCM film removal of Figures 3 and 4 at rinsing stage (above 20 min) demonstrates the superior surface cleanability of the copolymer solutions compared to the VO/W emulsions, albeit with higher friction and wear.…”

Section: Worn Track and Ball Scar Analysismentioning

confidence: 99%

Surface Film Adsorption and Lubricity of Soybean Oil In-Water Emulsion and Triblock Copolymer Aqueous Solution: A Comparative Study

2016

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This paper investigates the surface film adsorption and lubricity of two different types of potential environmentally friendly cold metal forming lubricants: soybean vegetable oil in water VO/W emulsions and triblock copolymer aqueous solutions. The lubricants have different visual appearance, surface film adsorption characteristic, lubricity and surface cleaning behaviour. The effects of concentration, temperature and emulsification ultrasonic energy (for VO/W emulsion) are studied. The result shows that the soybean VO/W emulsions have stronger adsorption, superior lubricity and anti-wear property compared to the copolymer solutions. The effect of temperature is investigated at 30 • C and 65 • C which are below and above cloud point of the aqueous copolymer solutions. Both lubricants show improved friction and anti-wear property at 65 • C. However, tenacious residual film remained on the discs surface after surface cleaning indicates lower cleanability of the soybean VO/W emulsions compared to the copolymer solutions, postulating the need for extra post-processing cleaning operations after cold forming process with VO/W emulsion lubricant.

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Oxidative stability of biodiesels produced from vegetable oils having different degrees of unsaturation

Cited by 72 publications

References 17 publications

Ethanol extraction renders a phenolic compounds‐enriched and highly stable jussara fruit (Euterpe edulis M.) oil

Ethanol extraction renders a phenolic compounds‐enriched and highly stable jussara fruit (Euterpe edulis M.) oil

Magonia pubescens (Sapindaceae) Seed Oil: Physical and Chemical Properties, Fatty Acid Profile and Biodiesel Production

Surface Film Adsorption and Lubricity of Soybean Oil In-Water Emulsion and Triblock Copolymer Aqueous Solution: A Comparative Study

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