Synchronized Analysis of FTIR Spectra and GCMS Chromatograms for Evaluation of the Thermally Degraded Vegetable Oils

Sim, Siong Fong; Lee, Terri Zhuan Ean; Lu, Nurul Aida Lu Mohd Irwan; Samling, Benedict

doi:10.1155/2014/271970

Cited by 24 publications

(9 citation statements)

References 30 publications

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“…[36,40,44] The band at 964 cm −1 appeared in FPO which had a less intense absorbance was probably due to small amounts of trans isomers formed upon RBD procedure during the production of fresh oil. [46] Several previous studies reported that the band near 967 cm −1 was shifted to higher wavelength and the band near 969 cm −1 was formed as the advanced oxidation process due to the formation of secondary oxidation products such as aldehydes or ketones with the isolated trans double bond. [42,44] Consistent with the previous studies, it was observed that this similar band was shifted from 964 cm −1 (in FPO) to the higher wavelength of 968 cm −1 (in RCO).…”

Section: Aberrations In Ftir Bands Due To the Reduction Of Cis Doublementioning

confidence: 98%

Detection of fresh palm oil adulteration with recycled cooking oil using fatty acid composition and FTIR spectral analysis

Lim

Mutalib

Khaza’ai

et al. 2018

International Journal of Food Properties

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There is a growing concern over the food safety issue related to increased incidence of cooking oil adulteration with recycled cooking oil (RCO). The objective of this study was to detect fresh palm olein (FPO) adulteration with RCO using fatty acid composition (FAC) and Fourier-transform infrared spectroscopy (FTIR) spectral analyses combined with chemometrics. RCO prepared in the laboratory was mixed with FPO in the proportion ranged from 1% to 50% (v/v) to obtain the adulterated oil samples (AO). FACs for FPO, RCO, and AO were determined using gas chromatography equipped with a flame ionization detector (GC-FID). The compositions of most fatty acids in RCO lied within the normal ranges of Codex standard, except for C8:0, C10:0, C11:0, C15:0, trans C18:1, and polyunsaturated fatty acids (PUFAs), C20:5. PUFAs showed a consistent decreasing trend with increasing magnitude of change with respect to increasing adulteration level and thus might be a good indicator for detecting FPO adulteration with RCO. The evaluation parameters (coefficient of determination, root mean standard error) of the FTIR-partial least square (PLS) model of palm oil adulteration with recycled oil are R 2 = 0.995 and 3.25, respectively. For FTIR spectral analysis, the distinct variations in spectral regions and aberrations in characteristic bands between FPO and RCO were observed. The optimized PLS calibration model developed from normal spectral of the combined region at 3602-3398, 3016-2642, and 1845-650 cm −1 overpredict the adulteration level. On the other hand, the discriminant analysis classification model was able to classify the FPO and AO into two distinct groups. Improvement of the principles of combined techniques in authenticating AO from fresh oil is beneficial as a guideline to detect adulteration in cooking oil.

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Section: Aberrations In Ftir Bands Due To the Reduction Of Cis Doublementioning

confidence: 98%

Detection of fresh palm oil adulteration with recycled cooking oil using fatty acid composition and FTIR spectral analysis

Lim

Mutalib

Khaza’ai

et al. 2018

International Journal of Food Properties

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“…Spectra were acquired by infrared reflection absorption spectroscopy at a resolution of 4 cm −1 in the range of 4000 to 400 cm −1 . Each spectrum was rationed against a fresh background spectrum recorded from the bare ATR crystal . Prior to collection of each background spectrum, the ATR crystal was cleaned with absolute ethanol to remove any residual.…”

Section: Methodsmentioning

confidence: 99%

Sliding wear‐induced nano‐tribofilm formation from EP/AW agent on copper foil against ferroalloy counterparts under high load

Xiong

Sun

2018

Surface & Interface Analysis

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Sliding friction of copper foil surface, which was exposed to bis (6-acetyl-1,3,6,2dioxazaborocan-2-yl) methyl phosphate (NEPB) as extreme-pressure/antiwear agent in base oil while rubbing by a ferroalloy disk under high load, was explored in a multi-specimen test machine to investigate the wear mechanism of NEPB on thin film lubrication. The results reveal that NEPB reduces the friction coefficient to~0.16 at normal load of 200 N, and it has better antiwear and friction-reducing property than the common copper oil. Ferroalloy against copper foil is along the Cu (111) direction, and the friction coefficient decrease relies on the spontaneous formation of chemically nanolayered tribofilm (approx. 30 nm) during sliding wear. The size of wear debris arranges from 6 nm to submicron. Decomposed borate esters and organic nitrides were adsorbed on the worn surface and P element of NEPB as extremepressure/antiwear agent reacted with Cu and existed in the form of phosphates, both of which contributed to the formation of boundary lubricating film.

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“…The carrier gas is pressurized helium 10.5 psi and a total rate of 140 ml/min and a split ratio of 1:50. 10,13…”

Section: Characterization Of Compoundmentioning

confidence: 99%

Anti-inflammatory activities of squalene compound of methanol extract of Abroma augusta L

Latief¹,

Muhaimin²,

Amanda³

et al. 2020

J. Teknol. Laboratorium

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Abroma augusta L plant traditionally was used to treat swellings, cuts, sores, and bruises. In the province of Jambi, A. augusta is used in folk medicine to treat wounds. This study aims to isolate the steroid compound from the root of A. augusta L and determine its anti-inflammatory activities. Extraction and fractionation have been done with graded maceration using solvents with different polarities, which are n-hexane, ethyl acetate, and methanol. The separation was performed by column chromatography, followed by preparative thin-layer chromatography. The characterization of the isolate was carried out using UV-Vis spectrophotometry and infrared spectrophotometry, GC-MS. The anti-inflammatory activities of methanol extract and isolate of A. augusta was performed in this study was designed to evaluate the dose-response relationship of the anti-inflammatory activity in rat models of chronic inflammation chromatography to obtain isolate 2.1.1 that characterize and showed maximum absorbance at 265. The result of IR showed the presence of functional groups, -C=C-H, -C=H, -CH, CH3, CH2, and –CO belongs to the steroid compound. The results of the GC-MS show that isolates contain squalene compounds with a value of m/z 410, Isolate and crude extract showed an anti-inflammatory activity that almost approached the positive control of sodium 4-chlorophenolate. It could be concluded that isolate and extract provide good anti-inflammatory activity, that promise for new drug candidate squalene-based A. augusta.

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Synchronized Analysis of FTIR Spectra and GCMS Chromatograms for Evaluation of the Thermally Degraded Vegetable Oils

Cited by 24 publications

References 30 publications

Detection of fresh palm oil adulteration with recycled cooking oil using fatty acid composition and FTIR spectral analysis

Detection of fresh palm oil adulteration with recycled cooking oil using fatty acid composition and FTIR spectral analysis

Sliding wear‐induced nano‐tribofilm formation from EP/AW agent on copper foil against ferroalloy counterparts under high load

Anti-inflammatory activities of squalene compound of methanol extract of Abroma augusta L

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