1H NMR spectral analysis as a new aspect to evaluate the stability of some edible oils

Almoselhy, Rania I.M.; Allam, M.; El-Kalyoubi, M. H.; El-Sharkawy, A.A.

doi:10.1016/j.aoas.2014.11.006

Cited by 40 publications

(17 citation statements)

References 21 publications

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“…The oil sample was dissolved in the deuterated chloroform. 1 HNMR spectra of the extracted PSO were recorded using a Bruker DRX‐400 NMR spectrometer (Bruker Instruments) with 1 H nuclei observed at 400 MHz (Almoselhy, Allam, El‐Kalyoubi, & El‐Sharkawy, ).…”

Section: Methodsmentioning

confidence: 99%

Optimized ultrasonic‐assisted extraction of papaya seed oil from Hainan/Eksotika variety

Zhang

Yingjie

Huang

et al. 2019

Food Science & Nutrition

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Hainan/Eksotika papaya is a popular cultivated plant in Hainan Island, China. Papaya seed oil (PSO) contains functional compounds with good antioxidant activity, especially monounsaturated fatty acids. In this work, the ultrasound‐assisted extraction (UAE) of PSO was optimized using response surface methodology. It was found that the optimal extraction performance was realized when the elevated time was set to 20 min, the ultrasound power was set to 250 W, and the n‐hexane‐to‐sample ratio was set to 16:1 (v/w). The highest yield of PSO (32.27%) was obtained under the optimal conditions, and PSO showed good oxidative stability. Differential scanning calorimetry analysis showed that the melting point of Hainan/Eksotika PSO was low, while its crystallization temperature was high. FTIR and NMR were used to analyze the chemical structure of PSO, which also proved that PSO possessed good stability without oxidative degradation. In addition, scanning electron micrograph was employed to investigate the change in seed microscopic structure. The results showed UAE caused serious structural damage of sample cell membranes and walls, which help oil access to the solvent with a high extraction ratio. The results indicated that UAE is an efficient environmental‐friendly, and promising technique could be applied to produce PSO or other edible oil with a better health‐beneficial value in food industry.

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Section: Methodsmentioning

confidence: 99%

Optimized ultrasonic‐assisted extraction of papaya seed oil from Hainan/Eksotika variety

Zhang

Yingjie

Huang

et al. 2019

Food Science & Nutrition

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show abstract

“…The oil sample was dissolved in the deuterated chloroform. The 1 H NMR spectra of the extracted PSO were acquired on a Bruker DRX‐400 NMR spectrometer with 1 H nuclei observed at 400 MHz (Bruker International AG, Rheinstetten, Germany) (Almoselhy, Allam, El‐Kalyoubi, & El‐Sharkawy, ).…”

Section: Methodsmentioning

confidence: 99%

Oxidative Stability of Papaya Seed Oil From Hainan/Eksotika Obtained by Subcritical and Supercritical Carbon Dioxide Extraction

Zhang

Xia

et al. 2018

J Americ Oil Chem Soc

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Papaya seed is a good source of edible oil with considerable antioxidant activity. Here, papaya seed oil (PSO) of Hainan/Eksotika variety was obtained by subcritical butane extraction (SBE) and supercritical carbon dioxide extraction (SCDE), and its yields, physicochemical properties, oxidative and thermal stability, and chemical and microscopic structures were compared. The results showed that SBE-PSO had a higher yield (25.88 AE 0.29% vs. 19.47 AE 0.92%), but a lower melting point compared to SCDE-PSO. Molecular structures indicated that there was no oxidative degradation during SBE and SCDE. Both SBE and SCDE caused significant structural changes of seed tissues. In addition, aldehyde composition analysis using high performance liquid chromatography (HPLC) showed that SBE-PSO had fewer octanal, nonanal, 2-decenal, and 2-undecenal contents than SCDE-PSO. All these results proved that SBE-PSO exhibited superiority on the oxidative stability compared to SCDE-PSO. It indicated that SBE was a superior method to obtain antioxidant edible oil with good stability.Keywords Papaya seed oil Á Hainan/Eksotika variety Á Subcritical butane extraction Á Supercritical carbon dioxide extraction Á Oxidative stability J Am Oil Chem Soc (2018) 95: 687-697.

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“…Signals from 4.40 to 4.70 ppm indicated hydrogen from the glyceryl group [-CH-O-C(¼O)-R]. A doublet at 5.31 ppm with J ¼ 6.24 Hz indicated hydrogens in cis (-CH¼CH-) in the double bonds of the acyl chain [10,[16][17][18][19][20]. A similar 1 H-NMR spectrum was observed for the PGS; however, with hydrogen in trans in the double bonds of the acyl chain [d 5.32; J ¼ 11.73 Hz (Fig.…”

Section: H-nmr Analysesmentioning

confidence: 99%

Synthesis and thermal study of polymers from soybean, sunflower, and grape seed maleinated oil

Alarcon

Almeida

Rinaldo

et al. 2017

Euro J Lipid Sci & Tech

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This paper presents the synthesis of some polymers from maleinated vegetable oils (soybean, sunflower, and grape seed) and glycerol. First, all the vegetable oils were previously maleinated with maleic anhydride, then, the maleinated oils were esterified with glycerol to obtain the polymers; the synthetic route is simple and not use organic solvents, the results indicate that the synthesis was effortless and use inexpensive reagents, such as vegetable oils, maleic anhydride, and glycerol. These polymers could be applied in the area of adhesives and waterproofing materials. The results obtained by TGA‐DTA and DSC data showed that these polymers had different thermal behaviors, which is related to the different quantity of unsaturated fatty acids in each oil structure. Finally, the FTIR and 1H‐NMR analysis help to clarify the polymers structure and the reaction sites: hence, it was possible to propose a reaction mechanism and the structure. Practical applications: The polymer synthesis of each vegetable oil was similar in time and process; however, the final product presented different physical characteristics. The results obtained by TGA‐DTA and DSC data showed that these polymers had different thermal behaviors, which is related by different quantity of unsaturated fatty acids in each oil structure. Finally, the FTIR and 1H‐NMR analysis help to clarify the polymers structure and the reaction sites: hence, it was possible propose a reaction mechanism and the structure. The results indicate that the synthesis was effortless and use inexpensive reagents, such as vegetable oils, maleic anhydride, and glycerol. These polymers could be applied in the area of adhesives and waterproofing materials. In this work synthesis of polymers from maleinated oils (soybean, sunflower, and grape‐seed) is shown. Possible structure is made by FTIR and 1H‐NMR analysis as well as its thermal characterization by TGA‐DTA and DSC.

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1H NMR spectral analysis as a new aspect to evaluate the stability of some edible oils

Cited by 40 publications

References 21 publications

Optimized ultrasonic‐assisted extraction of papaya seed oil from Hainan/Eksotika variety

Optimized ultrasonic‐assisted extraction of papaya seed oil from Hainan/Eksotika variety

Oxidative Stability of Papaya Seed Oil From Hainan/Eksotika Obtained by Subcritical and Supercritical Carbon Dioxide Extraction

Synthesis and thermal study of polymers from soybean, sunflower, and grape seed maleinated oil

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