Physicochemical Measurements Research Articles

Distribution of black flies (Diptera: Simuliidae) along an elevational gradient in the Andes Mountains of Colombia during the El Niño Southern Oscillation

Vector ecology is a key factor in understanding the transmission of disease agents, with each species having an optimal range of environmental requirements. Scarce data, however, are available for how interactions of local and broad-scale climate phenomena, such as seasonality and the El Niño Southern Oscillation (ENSO), affect simuliids. We, therefore, conducted an exploratory study to examine distribution patterns of species of Simuliidae along an elevational gradient of the Otún River in the Colombian Andes, encompassing four ecoregions. Larval and pupal simuliids were sampled at 52 sites ranging from 1800 to 4750 m above sea level in dry and wet seasons and during the La Niña phase (2011–2012) and the El Niño phase (2015–2016) of the ENSO; physicochemical measurements were taken during the El Niño phase. Twenty-seven species in two genera (Gigantodax and Simulium) were collected. Species richness and occurrence in each ecoregion were influenced by elevation, seasonality, and primarily the warm El Niño and cool La Niña phases of the ENSO. The degree of change differed among ecoregions and was related to physicochemical factors, mainly with stream discharge. Some putative simuliid vectors of Leucocytozoon, such as G. misitu and S. muiscorum, markedly changed in distribution and occurrence, potentially influencing parasite transmission.

Mealiness in ‘Forelle’ pears: relationship between TSS and prediction based on FT-NIR spectroscopy

'Forelle' pears are prone to mealiness, a dry textural disorder characterised by loss of free juice and development of a floury texture when fruit softens. There is currently no method of determining mealiness in intact fruit and no instrumental index which correlates with mealiness. Presently, mealiness determination is done by sensorial panels on cut fruit. This study investigated physicochemical attributes associated with mealiness and the potential of Fourier transform-near infrared (FT-NIR) spectroscopy for non-destructive detection of mealiness in 'Forelle' pears. Spectra were acquired on 400 fruit harvested from four farms over two seasons, stored for 8 weeks at -0.5°C and then for 7 d shelf life at 20°C. Physicochemical measurements were taken using standard destructive techniques. Mealiness was evaluated on each individual fruit by a panel of three trained evaluators and confirmed using the confined compression test. Principal component analysis (PCA) was done on physicochemical parameters to identify parameters that relate to mealiness. Orthogonal partial least squares discriminant analysis (OPLS-DA) of FT-NIR spectra was used to discriminate mealy from non-mealy fruit. PCA results showed high positive correlations between mealiness and total soluble solids (TSS). The results showed potential for discriminating between mealy and non-mealy fruit using FT-NIR spectroscopy. Classification accuracies for the two-class OPLS-DA models ranged from 51-95%. Through discriminant analysis, FT-NIR was shown to be a potential non-destructive method for determining mealiness and for the first time TSS was shown to be linked with mealiness.

Ageing Study of Palm Oil and Coconut Oil in the Presence of Insulation Paper for Transformers Application.

This paper presents a sealed ageing study of palm oil (PO) and coconut oil (CO) in the presence of insulation paper. The type of PO under study is refined, bleached, and deodorized palm oil (RBDPO) olein. Three different variations of RBDPO and one sample of CO are aged at temperatures of 90 °C, 110 °C, and 130 °C. The properties of RBDPO and CO as well as paper under ageing are then analysed through dielectric and physicochemical measurements. It is found that the effect of ageing is not significant on the alternating current (AC) breakdown voltages and relative permittivities of RBDPO and CO. There is a slight increment trend of the resistivity for CO, while for all of the RBDPO, the resistivity slightly decreases as the ageing progresses. Only CO shows an apparent reduction of the dielectric dissipation factor. Throughout the ageing time, the acidities of all of the RBDPO and CO remain at low level, while the moisture in oils decreases. The tensile index (TI) of the papers for all of the RBDPO and CO retain more than 50% of the TI. A significant increment of the paper ageing rates of all of the RBDPO and CO is observed at an ageing temperature of 130 °C.

Consumer preference and physicochemical evaluation of organically grown melons

Challenges in cultivar selection and availability has inhibited the expansion of the organic melon market. This study evaluated the sensory and physicochemical properties of four organically grown melon cultivars over a two-year period at three growing locations; two honeydew cultivars: ‘Dulce Nectar’ and ‘Jaune’, and two cantaloupe cultivars: ‘Athena’ and ‘Sivan’. Trained and consumer panels evaluated 17 sensory attributes, including appearance, texture, flavor, and overall acceptance. Physicochemical measurements included flesh color, texture, pH, soluble solids content (SSC), and titratable acidity (TA). Results showed that ‘Sivan’ and ‘Athena’ were preferred by panelists for their flavor and overall eating quality; these cultivars also had relatively high SSC, high pH, and low TA. Conversely, ‘Jaune’ was the least preferred, with higher intensities of ‘veggie’ and ‘green’ flavors; this cultivar also had relatively low pH and high TA. Overall, ‘Sivan’ performed consistently better than all other cultivars both years, scoring highest in positive attributes, such as ‘sweetness’ and ‘juiciness’. This research can be used to support the organic melon industry in cultivar selection.

Mesoporous bioactive glass embedding propolis and cranberry antibiofilm compounds.

The aim of this study was to evaluate the chemical reactivity of 58S mesoporous bioactive glass (MBG) particles in as-synthesized condition and after embedding propolis and cranberry antibiofilm compounds at different concentrations. MBG 58S was synthesized by alkali sol-gel method with the addition of the triblock pluronic copolymer P123 as surfactant. Samples were characterized by physicochemical properties measurement, N2 adsorption/desorption analysis, and field emission gun scanning electron microscopy (FEGSEM) observations. MBG powders were immersed into 5 and 10 µg/mL propolis or cranberry solutions for 24 h. The chemical reactivity of the specimens was evaluated by FEGSEM, EDX, FTIR, Ca/P ratio, XRD, and sample weight gain analysis after being immersed in simulated body fluid (SBF) for 8, 24, and 72 h. MBG particles exhibited the expected chemical composition with a particle size distribution ranging from 1.44 to 955 µm, and a mean particle size of 154 µm. MBG particles exhibited a pore volume of 0.8 cc/g, pore radius of ∼2 nm, and surface area of 350.2 m2 /g, according to BJH and BET analyses. A hydroxyl-carbonate apatite (HCAp) layer was formed on all samples after SBF immersion for 72 h. Pure MBG showed the highest chemical reactivity after 72 h, with the resulting apatite layer exhibiting a Ca/P ratio of ∼1.6 in accordance to stoichiometric biological apatite. MBG embedding propolis and cranberry can be considered for future microbiological analysis since the presence of propolis or cranberry did not interfere with MBG's ability to develop a HCAp layer, which is an essential feature for bone regeneration applications. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 1614-1625, 2018.

Fabricating soy protein hydrolysate/xanthan gum as fat replacer in ice cream by combined enzymatic and heat-shearing treatment

Soy protein hydrolysates (SPH) and their blends with xanthan gum (SPH/XG), produced via a combination of enzymatic hydrolysis and heat-shearing treatment, were used as fat replacers in the production of reduced fat ice cream. The physicochemical properties of soy protein isolate (SPI) and its hydrolysates with 1% (SPH1) and 5% degree of hydrolysis (SPH5) were characterized. The results suggested that enzymatic hydrolysis produced a lower average molecular weight (Mw), particle size, viscosity, and water holding capacity compared with SPI, but increased the solubility, oil holding capacity, and foaming capacity. The particle size of the SPH5/XG fat replacer was significantly reduced by enzymatic hydrolysis and heat-shearing treatment. In addition, the incorporation of XG could stabilize the composite system, as indicated by rheology measurement. The sensory properties of ice creams were correlated with the physicochemical measurements. The results illustrated that 50% fat-substituted ice cream with SPH5/XG (96:4) had an appearance, taste, and texture similar to that of 10% full fat ice cream, and the overall performance was acceptable among the low-fat ice cream samples. Therefore, SPH/XG treated by enzymatic hydrolysis and microparticulation is an alternative choice as a fat replacer in typical ice cream production.

Larval superiority of Culex pipiens to Aedes albopictus in a replacement series experiment: prospects for coexistence in Germany

BackgroundThe Asian tiger mosquito Aedes albopictus is an extremely invasive, globally distributed and medically important vector of various human and veterinary pathogens. In Germany, where this species was recently introduced, its establishment may become modulated by interspecific competition from autochthonous mosquito species, especially Culex pipiens (s.l.). While competitive superiority of Ae. albopictus to Cx. pipiens (s.l.) has been described elsewhere, it has not been assessed in the epidemiological conditions of Germany. The present study aimed to determine if such superiority exists under the physicochemical and microclimatic conditions typical for container habitats in Germany.MethodsIn a replacement series experiment, the larval and pupal responses of Ae. albopictus and Cx. pipiens (s.l.) (mortality, development time, growth) to interspecific interaction (five larval ratios) at (sub-)optimal temperatures (15, 20 and 25 °C) and differing food supply (3 and 6 mg animal-based food larva-1) were investigated using a randomized split-plot design. In addition to physicochemical measurements of the test media, natural physicochemical conditions were determined for comparative analyses in mosquito breeding sites across the Rhine-Main metropolitan region of Germany.ResultsUnder the physicochemical and microclimatic conditions similar to the breeding sites of the Rhine-Main region, competitive superiority of Cx. pipiens (s.l.) to Ae. albopictus in terms of larval survival was more frequently observed than balanced coexistence. Food regime and multifactorial interactions, but not temperature alone, were controlling factors for interspecific competition. Larval food regime and the larval ratio of Ae. albopictus influenced the physicochemistry and algal growth at 15 °C, with increased Ae. albopictus mortality linked to a decreasing number of Scenedesmus, Oocystis and Anabaena algae.ConclusionsUnder the present environmental conditions, the spread of Ae. albopictus from isolated foci in Germany may generally be slowed by biotic interactions with the ubiquitous Cx. pipiens (s.l.) (and potentially other container-breeding mosquito species) and by limnic microalgae in microhabitats with high resource levels. Detailed knowledge of the context dependency in temperate mosquito ecology, and interrelations of physicochemistry and phycology may help to achieve a better understanding of the upcoming Ae. albopictus colonization processes in central and northern Europe.

Non‐classical Design of High‐Efficiency Sensitizers for Dye‐Sensitized Solar Cells

The dye regeneration step in a dye‐sensitized solar cell (DSSC) affects significantly the device efficiency. To be able to predict the dye regeneration efficiency by the electrolyte this paper provides a facile way to design high‐efficiency sensitizers for DSSC. This paper proposes, for the first time, a simple and ingenious way to identify the dye regeneration sites and their relative efficiencies when a specific electrolyte is used. Two steps are proposed to identify the dye regeneration sites and their relative regeneration efficiencies: (1) drawing all the resonance structures of the oxidized dye to determine the regeneration sites, and (2) choosing the most favored site for dye regeneration as the chemically softest (when the redox couple used is soft I−/I3− pair) and the least spatially hindered site. The regeneration sites identified by the resonance structures are consistent with the β‐LUSO (β lowest unoccupied spin orbital) distribution, which is generally used for identifying the dye regeneration sites, calculated with DT‐DFT theory. The relative dye regeneration efficiency and photovoltaic performance of both ruthenium and metal‐free organic dyes predicted by the method reported here are supported by experimental data and the proposed dye regeneration mechanism. Several types of dye molecules are used to demonstrate the correctness of this new tool. This non‐classical tool, which uses the well‐known chemical knowledge of the resonance structure and hard–soft acid–base principle, without any computer calculation or physicochemical measurement, provides a very simple and powerful tool to quickly conceive high‐efficiency sensitizers for DSSCs.

Fluorescent Small Molecules Are BIG Enough To Sense Biomacromolecule: Synthesis of Aromatic Thioesters and Understanding Their Interactions with ctDNA.

The visible fluorescent chromophoric moiety present in the water-soluble photoactive yellow protein (PYP) of Ectothiorhodospira halophila is p-hydroxycinnamic acid linked to the cysteine residue (Cys-69) by a thioester bond and it controls the key photoinduced biological processes of the host organism. In the present work, we have synthesized and characterized three structurally different thiophenyl esters [viz., p-hydroxycinnamic-thiophenyl ester (1), p-N,N-dimethylaminocinnamic-thiophenyl ester (2), and S-phenyl-3-(4-chlorophenyl)-3-(phenylthio)propanethioate (3)] in addition to a novel (to the best of our knowledge) stilbene-type olefinic compound, N1,N1,N2,N2-tetramethyl-1,2-bis(phenylthio)ethene-1,2-diamine (4), under the same reaction condition. All of these four compounds showed characteristic and distinguishable chromophoric/fluorophoric behavior in ethanol and also at pH 7.4. However, we have observed that the intrinsic chromophoric/fluorophoric activities of (1) and (2) were greatly influenced during their interactions with calf-thymus DNA, studied by a range of spectroscopic and physicochemical measurements. We have also applied density functional theory [B3LYP, 6-311G+(d,p)]-based method to get optimized structures of (1) and (2), which were explored further for molecular docking studies to understand their mode of interaction with DNA. The present study opens up their possible applications as fluorescence probes for biomacromolecules like DNA in future.

Impact Assessment of Phosphogypsum Leachate on Groundwater of Sfax-Agareb (Southeast of Tunisia): Using Geochemical and Isotopic Investigation

The production of phosphoric acid by the Tunisian Chemical Group, in Sfax, Tunisia, led to the degradation of the groundwater quality of the Sfax-Agareb aquifer mainly by the phosphogypsum leachates infiltration. Spatiotemporal monitoring of the quality of groundwater was carried out by performing bimonthly sampling between October 2013 and October 2014. Samples culled in the current study were subject to physicochemical parameters measurements and analysis of the major elements, orthophosphates, fluorine, trace metals, and stable isotopes (18O,2H). The obtained results show that the phosphogypsum leachates infiltration has a major effect on the downstream part of the aquifer, where the highest values of conductivity,SO42-, Ortho-P, andF-, and the lowest pH were recorded. In addition, these results indicated that phosphogypsum leachates contained much higher amount of Cr, Cd, Zn, Cu, Fe, and Al compared to the groundwater. Spatiotemporal variation of the conductivity and concentrations of major elements is linked to the phosphogypsum leachates infiltration as well as to a wide range of factors such as the natural conditions of feeding and the water residence time. Contents ofO18and2H showed that the water of the Sfax-Agareb aquifer undergoes a large scale evaporation process originated from recent rainfall.

Overview on Untargeted Methods to Combat Food Frauds: A Focus on Fishery Products

Authenticity and traceability of food products are of primary importance at all levels of the production process, from raw materials to finished products. Authentication is also a key aspect for accurate labeling of food, which is required to help consumers in selecting appropriate types of food products. With the aim of guaranteeing the authenticity of foods, various methodological approaches have been devised over the past years, mainly based on either targeted or untargeted analyses. In this review, a brief overview of current analytical methods tailored to authenticity studies, with special regard to fishery products, is provided. Focus is placed on untargeted methods that are attracting the interest of the analytical community thanks to their rapidity and high throughput; such methods enable a fast collection of “fingerprinting signals” referred to each authentic food, subsequently stored into large database for the construction of specific information repositories. In the present case, methods capable of detecting fish adulteration/substitution and involving sensory, physicochemical, DNA-based, chromatographic, and spectroscopic measurements, combined with chemometric tools, are illustrated and commented on.

Combinations of NIR, Raman spectroscopy and physicochemical measurements for improved monitoring of solvent extraction processes using hierarchical multivariate analysis models

The reliability of chemical processes can be greatly improved by implementing inline monitoring systems. Combining multivariate analysis with non-destructive sensors can enhance the process without interfering with the operation. We present here hierarchical models using both principal component analysis and partial least square analysis developed for different chemical components representative of solvent extraction process streams. A training set of 380 samples and an external validation set of 95 samples were prepared and Near infrared and Raman spectral data as well as conductivity under variable temperature conditions were collected. The results from the models indicate that careful selection of the spectral range is important. By compressing the data through Principal Component Analysis (PCA), we lower the rank of the data set to its most dominant features while maintaining the key principal components to be used in the regression analysis. Within the studied data set, concentration of five chemical components were modeled; total nitrate (NO3−), total acid (H+), neodymium (Nd3+), sodium (Na+), and ionic strength (I.S.). The best overall model prediction for each of the species studied used a combined data set comprised of complementary techniques including NIR, Raman, and conductivity. Our study shows that chemometric models are powerful but requires significant amount of carefully analyzed data to capture variations in the chemistry.

Evaluation of the Food Sniffer electronic nose for assessing the shelf life of fresh pork meat compared to physicochemical measurements of meat quality

In food technology applications, electronic noses have been used on the on-line control of different processes. In this study, assessment of shelf life of fresh pork meat that had been stored under refrigeration in aerobic conditions using an electronic nose pocket device was tried. The physicochemical, sensory, and microbiological parameters of white female pork tenderloin, stored at 4 °C for 7 days, were related to the response obtained with an electronic nose device (Food Sniffer®) (FS) to validate its possible use as a rapid method of determining the shelf life of meat. The response of the electronic nose device, qualitatively validated, was significantly correlated with some parameters as microbiological counts or sensory parameters; unfortunately, tight quantitative limits between FS response and some analytical results as biogenic amine content could not be related.

Influence of the Pt nanoscale interlayer on stability and electrical property of Ti/Pt/Sb-SnO2 electrode: A synergetic experimental and computational study

The Ti/Pt/Sb-SnO2 electrodes with nanoscale Pt interlayers were fabricated by pyrolytic coating combining with magnetron sputtering method. The effects of introducing Pt interlayer were evaluated by physicochemical and electrochemical measurements. We calculated the texture coefficients of SnO2 crystals growing on Ti and Ti/Pt substrates according to the XRD data, and found the SnO2 crystalline grains growing on Ti and Ti/Pt having the different preferred orientations. Hence, we used the first-principles method building three kinds of supercells along diverse preferred orientations (110), (101) and (211) to simulate three types SnO2 crystalline grains. The computation results indicated the conductivity of supercell built along the (101) face was better than that of (211) face supercell. Furthermore, electrochemical tests such as linear sweep voltammetry (LSV), chronopotentiometry and electrochemical impedance spectroscopy (EIS) had been carried out on the Ti/Pt/Sb-SnO2 electrodes. We also discussed the changes of oxygen evolution overpotential and charge transfer resistant on the Ti/Pt/Sb-SnO2 electrodes in a physical perspective.

Promotion effect of tungsten and iron co-addition on the catalytic performance of MnOx/TiO2 for NH3-SCR of NOx

The influence of iron and tungsten in the Mn/Ti catalyst system on the activity and H2O induced deactivation was evaluated for the Selective Catalytic Reduction (SCR) of NO. The properties of the catalysts were characterized by physicochemical measurements, including BET surface area, X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR), NH3 temperature-programmed desorption (NH3-TPD), NO oxidation, X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance infrared spectroscopy (DRIFT) analyses. The results indicated that the addition of iron promoted surface species dispersion and increased valence state of manganese species, which enhanced the low-temperature activity. The addition of tungsten enhanced the acid sites and improved the thermal stability of the acid sites. Thus, the Mn10Fe10/W3Ti exhibited excellent NOx conversion and N2 selectivity during high temperature compared with Mn10/Ti and Mn10Fe10/Ti catalysts. Furthermore, the addition of tungsten exhibited excellent resistance to H2O induced deactivation. Accordingly, the co-addition of iron and tungsten with proper ratios to Mn/Ti resulted in excellent NOx conversion, N2 selectivity and H2O resistance.

Comparative studies of anticorrosion performance of novel inhibitors based on oleic acid and sulfur/nitrogen containing compounds in UV-curable coatings

ABSTRACTA natural resource-based oleic acid was epoxidised to produce epoxidised oleic acid (EOA). The epoxidation reaction was confirmed by different analyses. Then, EOA was reacted with nitrogen- and sulphur-containing compounds such as glycine (GLY) and thioglycolic acid (TGA) to prepare EOA-GLY and EOA-TGA compounds, respectively. The EOA, EOA-GLY, and EOA-TGA compounds were evaluated as corrosion inhibitors (CIs) for mild steel in different coating formulations. Corrosion resistance tests and weight loss measurements of the coated steel panels were carried out, in addition to the physico-chemical and mechanical measurements. It was found that the coating formulations containing the prepared EOA-TGA inhibitor with a concentration (0.04 g/100 g coating) imparted higher protection for steel surface against corrosion and also competed efficiency known commercial CI at the same concentration. Also, the efficiency of the commercial and prepared inhibitors was increased in the following order: EOA-TGA > EOA-GLY > commercial inhibitor > EOA.

ASSESSMENT OF ECOLOGICAL STATE OF THE VELIKAYA RIVER DELTA BASED ON HYDROCHEMICAL INDICATORS AND STRUCTURE OF PHYTOPLANKTON

The basis of the existence of freshwater ecosystems is phytoplankton, which produces most of the primary biological production, participates in repair processes and provides a wide range of ecosystem services. The short life cycle and high speed metabolism of microalgae make them ideal objects for ecological monitoring.
 The aim of the present study is to research the ecological state of the Velikaya river delta based on the species composition of phytoplankton community and some hydrochemical parameters.
 The sample collection for phytoplankton study and physicochemical measurements was carried out in summer 2016 at five stations representing different ecological locations of the Velikaya river delta. 
 One hundred sixty five species taxa of microalgae belonging to 8 phylums were identified during the research: Bacillariophyta (37%), Chlorophyta (33.9%), Cyanophyta/Cyanobacteria (9.7%), Chrysophyta (6.1%), Euglenophyta (6.1%), Cryptophyta (3%), Dinophyta (3%), Xanthophyta (1.2%).
 The values of Shannon index indicate the average complexity of the microalgae communities structure. Values of Margalef index characterize the Velikaya river delta as an area of high species richness. Compared to the previous studies, a significant increase in the level of information diversity is observed, indicating an increase in the number of possible flows of substance and energy in the ecosystem. Dynamics of biogen substances in the water shows a slight increase of their concentrations.
 Ecological and geographical analysis proves that absolute dominance of cosmopolitan freshwater forms is typical for the algoflora of the Velikaya river delta. In relation to the pH-reaction inhabitants of neutral and slightly alkaline water dominate. Pantle–Buck saprobity index is applied for water quality assessment, which shows beta-mesosaprobic water quality in the ecosystem. Thus, the water of the Velikaya river delta could be referred to the category of moderately polluted water (class II of water quality). This is confirmed by the data of hydrochemical analysis.

Optimization of Omeprazole Synthesis: Physico-Chemical Steering Towards Greener Processes

This work presents an optimization of the synthetic procedure for production of Omeprazole, a highly important pharmaceutical. The physico-chemical measurements of the protonation and solution processes regarding the Omeprazole precursors aided the conception of the optimization strategy based primarily on the modifications of the reaction media. To this end, the protonation (KH) and solvation properties (solubilities, solution enthalpies, and entropies) of the starting materials and the intermediate were determined in different methanol/water mixtures and pure methanol, allowing the selection of the solvent optimal for the Omeprazole synthesis. In addition, it was proven that the energetically demanding refluxing procedure, which is conventionally used in the first step of the Omeprazol synthesis, was unnecessary. Similar holds for the time-consuming trituration employed in the step involving precipitation of the final product. It was shown that trituration period can be significantly reduced without affecting the purity of the product. Taking into account the above-mentioned findings, the improved procedure (compared to the standard one) for Omeprazol preparation was proposed. It was based on a greener process demanding less organic solvent, exhibiting enhanced energy- and time-efficiency, which could be implemented in the large scale production. The concept devised in this work could easily be extended to other systems ameliorating the synthetic procedures of valuable drugs, rendering higher profit and lowering ecological risks.

Fe3O4–cysteamine hydrochloride magnetic nanoparticles: New, efficient and recoverable nanocatalyst for Knoevenagel condensation reaction

Fe3O4 magnetic nanoparticles (MNPs) were obtained using a reduction–precipitation method. These MNPs were modified with cysteamine hydrochloride. This catalyst was characterized using a number of physicochemical measurements. The Fe3O4–cysteamine MNPs, as an efficient and heterogeneous catalyst, were successfully used for Knoevenagel condensation under mild conditions. The activity of this nanomagnetic catalyst in the Knoevenagel condensation of aromatic aldehydes and malononitrile is described. Easy preparation of the catalyst, easy work‐up procedure, excellent yields and short reaction times are some of the advantages.

Synergetic Use of Principal Component Analysis Applied to Normed Physicochemical Measurements and GC × GC-MS to Reveal the Stabilization Effect of Selected Essential Oils on Heated Rapeseed Oil.

Lipid oxidation leads to the formation of volatile compounds and very often to off-flavors. In the case of the heating of rapeseed oil, unpleasant odors, characterized as a fishy odor, are emitted. In this study, 2 different essential oils (coriander and nutmeg essential oils) were added to refined rapeseed oil as odor masking agents. The aim of this work was to determine a potential antioxidant effect of these essential oils on the thermal stability of rapeseed oil subject to heating cycles between room temperature and 180 °C. For this purpose, normed determinations of different parameters (peroxide value, anisidine value, and the content of total polar compounds, free fatty acids and tocopherols) were carried out to examine the differences between pure and degraded oil. No significant difference was observed between pure rapeseed oil and rapeseed oil with essential oils for each parameter separately. However, a stabilizing effect of the essential oils, with a higher effect for the nutmeg essential oil was highlighted by principal component analysis applied on physicochemical dataset. Moreover, the analysis of the volatile compounds performed by GC×GC showed a substantial loss of the volatile compounds of the essential oils from the first heating cycle.