Viscosity-Temperature Stability, Chemical Characterization, and Fatty Acid Profiles of some Brands of Refined Vegetable Oil

IF 1.4 Q3 CHEMISTRY, MULTIDISCIPLINARY Physical Chemistry Research Pub Date : 2020-09-01 DOI:10.22036/PCR.2020.221177.1737
M. Abdul-Hammed, Ebhohimen Ehizuelen Israel, I. Abdulwahab, Abdulrafiu Olakunle Jaji
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引用次数: 1

Abstract

Oils of vegetable origin are of great importance in food, soap, and cosmetic industries and they may also be used as lubricants and raw materials for biodiesel production depending on their viscosity and thermal stability. This work provides insight into the fatty acid components, physicochemical properties and thermal stability of some refined vegetable oils. The Saponification values, peroxide values, acid values, iodine values and refractive index of these oils range from 185.38 to 209.26 mg/g KOH, 2.00 to 37.00 meq O2/ kg, 2.50 to 5.50 mg KOH/ g, 31.09 to 89.46 g / 100g and 1.441 to 1.488 respectively The activation energies obtained from Arrhenius-type equation range from 11.32 to 3.85 kJ mol-1, while the enthalpy (∆H҂) and entropy (∆S҂) of activation obtained from Eyring-type equation range from 6.852 to 14.317 kJ mol-1 and -31.85 to -29.06 J mol-1 K-1 respectively. The Gibbs free energy of activation (∆G҂) ranges from 15.51 to 23.81 k J mol-1. The Pw oil brand has the highest thermal stability and resistance to shear stress due to its high activation energy and a low degree of unsaturation. The heat was absorbed during the process, the reaction mechanism was associative and the entire process was non-spontaneous.
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一些品牌精制植物油的粘温稳定性、化学特性和脂肪酸谱
植物油在食品、肥皂和化妆品工业中非常重要,根据其粘度和热稳定性,它们也可以用作润滑油和生产生物柴油的原料。这项工作深入了解了一些精制植物油的脂肪酸成分、理化性质和热稳定性。这些油的皂化值、过氧化值、酸值、碘值和折射率分别为185.38至209.26mg/gKOH、2.00至37.00meq O2/kg、2.50至5.50mgKOH/g、31.09至89.46g/100g和1.441至1.488,由Eyring型方程得到的活化焓(∆H҂)和活化熵(∆S \1154)分别为6.852~14.317 kJ mol-1和-31.85~-29.06 kJ mol-1K-1。活化的吉布斯自由能(∆G҂)范围为15.51至23.81 k J mol-1。Pw油品牌由于其高活化能和低不饱和度而具有最高的热稳定性和抗剪应力性。在这个过程中热量被吸收,反应机制是关联的,整个过程是非自发的。
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来源期刊
Physical Chemistry Research
Physical Chemistry Research CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
2.70
自引率
8.30%
发文量
18
期刊介绍: The motivation for this new journal is the tremendous increasing of useful articles in the field of Physical Chemistry and the related subjects in recent years, and the need of communication between Physical Chemists, Physicists and Biophysicists. We attempt to establish this fruitful communication and quick publication. High quality original papers in English dealing with experimental, theoretical and applied research related to physics and chemistry are welcomed. This journal accepts your report for publication as a regular article, review, and Letter. Review articles discussing specific areas of physical chemistry of current chemical or physical importance are also published. Subjects of Interest: Thermodynamics, Statistical Mechanics, Statistical Thermodynamics, Molecular Spectroscopy, Quantum Chemistry, Computational Chemistry, Physical Chemistry of Life Sciences, Surface Chemistry, Catalysis, Physical Chemistry of Electrochemistry, Kinetics, Nanochemistry and Nanophysics, Liquid Crystals, Ionic Liquid, Photochemistry, Experimental article of Physical chemistry. Mathematical Chemistry.
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