Oxidation kinetic studies of oils derived from unmodified and genetically modified vegetables using pressurized differential scanning calorimetry and nuclear magnetic resonance spectroscopy

Adhvaryu, Atanu; Erhan, Sevim Z.; Liu, Z.S.; Perez, Joseph Manuel Sr

doi:10.1016/s0040-6031(00)00626-2

Cited by 223 publications

(163 citation statements)

References 29 publications

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“…Taking into consideration the rates of lipid oxidation (Table 3) as a function of temperature, the higher the process temperature, the higher the oxidation rate [40]. The k values for camelina oils demonstrated the same pattern and were 18-22 times higher, respectively, at 130 than at 90°C.…”

Section: Kinetic Analysis Of Rancimat and Pdsc Datamentioning

confidence: 83%

“…It was previously reported that a high PUFA content would lower, while high MUFA and SFA content would increase the E a value for lipid oxidation process [40]. It stays in agreement with results obtained herein, when compared with oils containing smaller PUFA content: hazelnut oil (Rancimat E a = 84.7 kJ mol -1 ; PDSC E a = 89.1 kJ mol -1 ) and rapeseed oil (Rancimat E a = 80.99 kJ mol -1 ; PDSC E a = 92.69 kJ mol -1 ) [35].…”

Section: Kinetic Analysis Of Rancimat and Pdsc Datamentioning

confidence: 97%

“…In terms of oils, the E a value is affected by the degree of unsaturation [39,40]. It was previously reported that a high PUFA content would lower, while high MUFA and SFA content would increase the E a value for lipid oxidation process [40].…”

Section: Kinetic Analysis Of Rancimat and Pdsc Datamentioning

confidence: 99%

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Oxidative stability of camelina (Camelina sativa L.) oil using pressure differential scanning calorimetry and Rancimat method

Ratusz

Popis

Ciemniewska‐Żytkiewicz

et al. 2016

J Therm Anal Calorim

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The camelina oil, registered in EU as Traditional Speciality Guaranteed, is an excellent edible oil rich in x3 fatty acids, as well as a great raw material for biodiesel production. However, both variable seed quality and technological difficulties (cold pressing, no chemical refining procedure) exert an unfavorable impact on a final oil quality and its oxidative stability. Therefore, oxidative stability parameter seems to be a significant distinguishing feature of camelina oil. The aim of this work was to compare the oxidative stability of selected camelina oils and assessment of kinetic parameters of their oxidation determined by PDSC and the Rancimat methods. Coldpressed camelina oils were initially characterized by basic quality parameters: fatty acids composition, free fatty acids, peroxide value and anisidine value. The isothermal PDSC and Rancimat procedures were conducted within the temperature range of 90-130 and 80-120°C, respectively. From the obtained results, the times to reach the oxidation peak maximum (s max ) obtained from PDSC analysis were compared with induction times (s on ) determined by Rancimat test. Based on the Arrhenius equation and transition state theory, activation energies (E a ), pre-exponential factors (Z) and specific rate constants (k) of oils oxidation at selected temperatures were calculated. Strong correlation between PDSC and Rancimat methods (R 2 [ 0.98) using a polynomial equation was obtained; thus, PDSC method can be preliminary recommended as an appropriate objective method for assessing the oxidative stability of camelina oils. To the best of our knowledge, this is the first study on the possible use of PDSC technique to analyze the kinetics of oxidation of camelina oil.

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Section: Kinetic Analysis Of Rancimat and Pdsc Datamentioning

confidence: 83%

Section: Kinetic Analysis Of Rancimat and Pdsc Datamentioning

confidence: 97%

See 1 more Smart Citation

Oxidative stability of camelina (Camelina sativa L.) oil using pressure differential scanning calorimetry and Rancimat method

Ratusz

Popis

Ciemniewska‐Żytkiewicz

et al. 2016

J Therm Anal Calorim

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show abstract

“…This behavior is due to the high oxidation susceptibility of the unsaturated C=C and C≡C groups, present inside the molecule 54,55 . The oxidation was enhanced by the experimental conditions, such as air atmosphere, shear stress application to the fluid intrinsic of the wear test, and the localized increase of the temperature.…”

Section: Chemical Stability Of Lubricant Fluids After the Wear Testsmentioning

confidence: 99%

Protic Ionic Liquids Used as Metal-Forming Green Lubricants for Aluminum: Effect of Anion Chain Length

et al. 2017

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Among the applications for protic ionic liquids (PILs), lubrication is one of the newest and the most promising. In this work, ammonium-based protic ionic liquids were tested as lubricant fluids for aluminum-steel contacts. PILs were synthesized with 2-hydroxyethylamine (2HEA) and a carboxylic acid (formic and pentanoic), aiming to understand the effect of two different anion chain lengths on the lubricant behavior. The synthesized PILs were characterized by RMN, FTIR and TGA. Wear tests, conducted using a ball-on-plate configuration, showed that the increase of the anion carbon chain length in the PIL structure reduced significantly the coefficient of friction value. Besides, after the wear tests, the PILs structural integrity was not affected. In the same way, bending under tension (BUT) tests evidenced that the performance for stamping conditions of the PIL with the longest anion carbon chain was similar to that of the commercial lubricant. Since, both formed a uniform tribofilm, developed the same lubrication regime and the drawing forces values were close and constant. Hence, the ionic liquid obtained with 2HEA and pentanoic acid (2HEAPe) is as suitable as the commercial lubricant for metal forming processes.

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“…In this study, the diesters were screened to measure their oxidative stability using PDSC through determination of oxidation temperature (OT), which is defined as the temperature at which a rapid increase in the rate of oxidation is observed. High oxidative stability value means more stability to be oxidised (Adhvaryu et al 2000).…”

Section: Lubricity Properties Of Diestermentioning

confidence: 99%

Lubricity and Tribological Properties of Dicarboxylic Acid and Oleyl Alcohol Based Esters

Salimon¹,

Ahmed²,

Salih³

et al. 2015

JSM

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Oxidation kinetic studies of oils derived from unmodified and genetically modified vegetables using pressurized differential scanning calorimetry and nuclear magnetic resonance spectroscopy

Cited by 223 publications

References 29 publications

Oxidative stability of camelina (Camelina sativa L.) oil using pressure differential scanning calorimetry and Rancimat method

Oxidative stability of camelina (Camelina sativa L.) oil using pressure differential scanning calorimetry and Rancimat method

Protic Ionic Liquids Used as Metal-Forming Green Lubricants for Aluminum: Effect of Anion Chain Length

Lubricity and Tribological Properties of Dicarboxylic Acid and Oleyl Alcohol Based Esters

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