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Wyszukujesz frazę "vegetable oils" wg kryterium: Temat


Tytuł:
Natural cold pressed oils as cosmetic products
Autorzy:
Ligęza, Małgorzata
Wyglądacz, Dominika
Tobiasz, Aleksandra
Jaworecka, Kamila
Reich, Adam
Powiązania:
https://bibliotekanauki.pl/articles/552832.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
plant oils
vegetable oils
patch tests
contact eczema
cosmetics.
Źródło:
Family Medicine & Primary Care Review; 2016, 4; 443-447
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Physico-chemical Studies of Base Catalyzed Methanolysis of Some Virgin Tropical Seed Oils
Autorzy:
Esonye, Chizoo
Onukwuli, Okechukwu Dominic
Ofoefule, Akuzuo Uwaoma
Powiązania:
https://bibliotekanauki.pl/articles/1113573.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Extraction
Physico-chemical Parameters
Transesterification; Biodiesel
Vegetable oils
Opis:
The physico-chemical characterization of Prunus amygdalus, Dacryodes edulis and Chrysophillum albidium seed oils were investigated, together with their methyl esters. The vegetable oils were extracted by applying the solvent extraction method, using n-hexane. Prunus amygdalus had the highest oil yield (60.1%), followed by Dyacrodes edulis (55.76 %) and least from Chrysophillum albidium (13.67%). The oils and their biodiesel were then analyzed for acid value, free fatty acid, specific gravity, ash content, iodine value, peroxide value, saponification value, kinematic viscosity, flash point, smoke point, titre value, cloud point, moisture content and refractive index. Accordingly, Dyacrodes edulis seed oil had the highest acid value of 6.57 and required two-step transesterifictaion. The produced biodiesels were discussed in the light of ASTM D 9751, ASTMD 6751 and DIN 14214. These showed yields of 94.36%, 93.03% and 86.49%, cetane numbers of 70.40, 55.20 and 64.57 and calorific values of 31,178.39 KJ/kg, 34,421.50 KJ/kg and 32,838.38 KJ/kg for Prunus amygdalus, Dacryodes edulis and Chrysophyllum albidium, respectively. Other fuel-related properties showed highly improved qualities upon transesterification and compared well with ASTM and EU standards. The overall results showed that the seed oils are viable for biodiesel production.
Źródło:
World News of Natural Sciences; 2017, 15; 112-128
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study of selected lubricating properties of biofuels
Autorzy:
Gardyński, L.
Kałdonek, J.
Powiązania:
https://bibliotekanauki.pl/articles/102464.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
vegetable oils
rapeseed oil methyl esters
lubricating properties
Opis:
The paper presents the research results of lubricity of selected vegetable oils, rapeseed oil methyl esters, and esters with addition of oleic acid. Higher wear of samples during lubrication by rapeseed oil methyl esters in comparison to the tested vegetable oils was obtained. The addition of oleic acid to esters resulted in the improvement of their lubricating properties.
Źródło:
Advances in Science and Technology. Research Journal; 2013, 7, 20; 75-79
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of non-converted vegetable oils in contemporary self-ignition engines
Autorzy:
Reksa, M.
Powiązania:
https://bibliotekanauki.pl/articles/245366.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engines
vegetable oils
diesel engine
alternative fuels
Opis:
The paper presents a test of a self-ignition engine equipped with high-pressure fuel-dosing system based on injection units with electronic control system. The engine was fuelled with conventional fuel and few kinds of non-converted vegetable oil. The analysis of the experiment results correlated with knowledge of their properties shows the important conclusions about possibilities, disadvantages and perspectives of the fuels usage in contemporary engines equipped with electronic control fuel-dosing system. The vegetable oils have a special place in history of automotive industry. In 1900 a great event on Word Trades in Paris was compression-ignition engine fuelled by groundnuts oil — a masterpiece of no one else like Rudolf Diesel. R. Diesel, aware of conventional fuels limitation, patented in 1892 a vegetable oil as a fuel. The NOx concentration in exhaust was measuredfor maximum engine speed (1900 rpm). The lowest emission ofmeasured compounds was observed in case of sunflower oil and rape oil "Biedronka" (65% and 75% of emission during engine work fuelled by conventional diesel oil). The highest values were detected for post frying palm oil and rape oil "Aldi" (120% of emission during engine work fuelled by conventional diesel oil).
Źródło:
Journal of KONES; 2009, 16, 4; 385-391
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of carotenoid and chlorophyll content on the oxidative processes in the selected vegetable oils
Autorzy:
Mahoney, E.Y.
Milewska, M.
Mironczuk-Chodakowska, I.
Terlikowska, K.M.
Powiązania:
https://bibliotekanauki.pl/articles/1918745.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Vegetable oils
total colour
acid number
peroxide number
Opis:
Purpose: More than 100 plant species have been classified as oil products, but only a few of them are used in industrial production. In the available literature, there are no studies that would describe the relationship between the content of plant dyes and their impact on auto-oxidative processes. Therefore, this study aimed to determine dye composition and to define their effect on the acid value, peroxide value and quality assessment of selected refined and unrefined oils. Materials and methods: Twenty samples from different manufacturers were evaluated. Oils were purchased from retail trade of the Bialystok city. The total colour, acid, and peroxide values were determined in accordance with the Polish Standards PN-ISO 3960: 1996, PN-A-86934: 1995 and PN-ISO 3960: 1996, respectively. Results: Statistically significant differences of total colour values between both groups were found (p=0.002). The acid value of refined oils was lower than in an unrefined group (p=0.02). A positive statistically significant correlation was noticed between the total colour value and the acid value in the refined group (R=0.65, p=0.04). No significant effect of plant dyes on the acid or peroxide value of unrefined oils was observed. Conclusions: Refined and unrefined oils purchased in the city of Bialystok mostly met the standard values with the exception of cold-pressed oil from black cumin seeds, where the acid and peroxide value exceeded the values set in Codex Alimentarius.
Źródło:
Progress in Health Sciences; 2018, 8(2); 144-151
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technological aspects of vegetable oils epoxidation in the presence of ion exchange resins: a review
Autorzy:
Milchert, E.
Malarczyk-Matusiak, K.
Musik, M
Powiązania:
https://bibliotekanauki.pl/articles/779147.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
acidic ion exchange resins
epoxidation
review
vegetable oils
Opis:
A review paper of the technology basics of vegetable oils epoxidation by means of peracetic or performic acid in the presence of acidic ion exchange resins has been presented. The influence of the following parameters: temperature, molar ratio of acetic acid and hydrogen peroxide to ethylenic unsaturation, catalyst loading, stirring intensity and the reaction time on a conversion of ethylenic unsaturation, the relative percentage conversion to oxirane and the iodine number was discussed. Optimal technological parameters, mechanism of epoxidation by carboxylic peracids and the possibilities of catalyst recycling have been also discussed. This review paper shows the application of epoxidized oils.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 3; 128-133
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of tribological properties of seals running in contact with vegetable oil
Ocena właściwości tribologicznych uszczelnień pracujących w kontakcie z olejami roślinnymi
Autorzy:
Szczypiński-Sala, W.
Lubas, J.
Powiązania:
https://bibliotekanauki.pl/articles/190343.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
mechanical seals
vegetable oils
friction
uszczelnienia
oleje roślinne
tarcie
Opis:
The article describes the results of the measurement to evaluate the operation characteristic of o-ring seals in case of the operation with vegetable oils. The measurements were made on the model of a sealing node in hydraulic cylinder, where the round cross section seal cooperated with the piston rod. The changes of the friction force during rod movement resulting from the friction between the seal and the rod were analysed. The tests were carried out with two vegetable oils mostly used in industry: rape oil and soybean oil. The products based on vegetable oils can be an alternative to products made on the basis of petroleum. However, vegetable oils are characterized by other properties than mineral oils. The physical and chemical properties of vegetable oils depend on the composition of the fatty acid mixture. The observation of the influence of the occurrence of oxidative gelation on friction force was also conducted. In case of vegetable oils, oxypolymerization tendencies of these fluids are a very significant factor, which can influence the characteristics of friction nodes operation.
W artykule omówiono wyniki przeprowadzonych badań, których celem była ocena charakterystyki pracy uszczelnienia w ruchu posuwisto-zwrotnym działającego w kontakcie z olejami roślinnymi. Pomiary wykonano na modelu węzła uszczelniającego w cylindrze hydraulicznym. Badaną parą uszczelniającą było tłoczysko i pierścień uszczelniający typu o-ring. Analizie poddano zmiany siły tarcia podczas roboczego suwu tłoczyska oraz wpływ na ich wartość prędkości przesuwu tłoczyska. Podczas testów w celu porównania wykorzystano dwa szeroko rozpowszechnione oleje roślinne: olej rzepakowy i olej sojowy. Produkty oparte na olejach roślinnych stanowić mogą alternatywę dla tych pochodzenia mineralnego. Oleje roślinne charakteryzują się jednak odmiennymi właściwościami w porównaniu z olejami mineralnymi. W ich przypadku obserwuje się tendencję do przebiegających z czasem reakcji polimeryzacji prowadzących do zmian lepkości i żelowania oleju. Wpływ tych zjawisk na prace węzła uszczelniającego również był przedmiotem obserwacji.
Źródło:
Tribologia; 2017, 276, 6; 95-103
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of methylene blue dye from wastewater by using supported liquid memberane technology
Autorzy:
Ashraf, M. W.
Powiązania:
https://bibliotekanauki.pl/articles/779030.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
supported liquid membrane
vegetable oils
cationic dye
industrial wastes
Opis:
The present work describes the application of Supported Liquid Membrane (SLM) technology towards the removal and recovery of a cationic dye (Methylene Blue) from aqueous solutions. Natural and non-toxic vegetable oils have been impregnated on microporous polymeric films of polyvinylidene fluoride (PVDF) to constitute a liquid membrane. Different parameters affecting the transport, like pH of feed solution, acid concentration in the strip solution, initial dye concentration, oil types and stirring speeds have been investigated. Highest value of flux (1.7 x 10–5 mg/cm2/sec1) for methylene blue dye was achieved with sunflower oil impregnated on the PVDF support, with pH maintained at 12 in the feed solution and 0.3 M hydrochloric acid concentration in the strip solution. It took 6 hours to transport maximum amount of dye under optimum conditions.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 2; 26-30
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vegetable oils as additives to improve the lubricity of low-sulphur fuels
Autorzy:
Ambrosewicz-Walacik, M.
Pszczółkowski, B.
Tańska, A.
Powiązania:
https://bibliotekanauki.pl/articles/247047.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
sulphur content
different species
vegetable oils
biofuel production
lubricity
Opis:
The aim of the study was to determine the sulphur content in 33 samples of oils pressed from different species of vegetable. The unconventional oil samples were purchased from commercial store. Oils was analysed in terms of sulphur content according to the method using X-ray fluorescence spectrometry with wave dispersion, that is described in the PN-EN ISO 20884, 2012 standard. Obtained results of sulphur analysis were presented as the arithmetic mean ± standard deviation (from three replicates) and statistically analysed using the Statistica 13.0 PL program. In order to indicate significance of differences between oils analysis of variance (ANOVA) with Tukey’s test of p ≤ 0.05 significance level was used. The statistical analysis indicated significant differences in the content of sulphur content in the analysed vegetable oils, which could affect the lubricity of prepared fuel blends and in some cases significantly, increase the sulphur content above acceptable value 10 ppm. It was concluded that vegetable oils could be a suitable raw material improving the lubricating properties of low-sulphur diesel oils. However, due to significant differences in the sulphur content in the analysed samples, the content of this element should be analysed beforehand in order to eliminate the possibility of exceeding the permissible level of sulphur in transport fuels.
Źródło:
Journal of KONES; 2018, 25, 2; 31-36
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation of the combustion of vegetable oils in diesel engine at low engine loads
Autorzy:
Błažek, J.
Vojtišek, M.
Powiązania:
https://bibliotekanauki.pl/articles/243132.pdf
Data publikacji:
2007
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
vegetable oils
diesel fuels
in-cylinderpressure measurement system
combustion engines
emissions
Opis:
Vegetable oils are being increasingly used as fuel in diesel engines in passenger vehicles, with various results. One of the associated problems is excessive emissions of organic compounds at very low engine loads. Aside from an undesirable increase in emissions, such compounds also contribute to the formation of deposits in the engine and in the catalytic reactor. In this study, a typical turbodiesel engine, adapted for operation on vegetable oils, was fitted with fast-response in-cylinder pressure measurement system. The engine was operated on an engine dynamometer at low loads typical for urban driving at several coolant and fuel temperatures. Results will be presented and discussed. Engine and rapeseed oil fuelling system setup, comparison of combustion timing of diesel fuel and rapeseed oil, indicated in-cylinder pressure for diesel fuel and rapeseed oil for different speeds and loads, indicated in-cylinder pressure at original and modified injection timing, comparison of nox and CO2 concentrations at original injection timing, emissions from rapeseed oil relative to diesel fuel at different speeds and loads, effect of injection timing optimization on peak indicated pressure, effect of injection timing optimization on nox and CO concentrations, Brake-specific fuel consumption, are presented in the paper.
Źródło:
Journal of KONES; 2007, 14, 3; 61-72
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technology of Wastewater Treatment Production of Vegetable Oils and Fats and Evaluation of Aeration Tank Efficiency on the Basis of Microanalysis of Activated Sludge
Autorzy:
Korotkova, Tatyana Germanovna
Altukhova, Darya Vladimirovna
Istoshina, Natalya Yurevna
Demin, Vladimir Ivanovich
Powiązania:
https://bibliotekanauki.pl/articles/123766.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
monitoring
wastewater
aeration tank
microorganisms
activated sludge
production
vegetable oils
fats
Opis:
This article discusses the main stages and features of wastewater treatment at “Food Ingredients” LLC (Russia, Krasnodar region) involved in vegetable oils and fats refining. The experimental data on averaged qualitative composition of industrial wastewater involving the period from January to June, 2018 were presented. The indicators of the quality of averaged waste did not exceed: 20 mg/l for ammonium nitrogen; 20 mg/l for phosphates; 800 mg/l for suspended solids; 700 mg/l for fatty substances. The operation of biological aeration tank was analyzed from January to June, 2018. The graphic dependences of the change of sludge index, phosphate ions, chemical oxygen demand (COD), and temperature were given. The species composition of microorganisms and their amount were determined by means of optical microscopy. Absolute quantity of microorganisms in activated sludge was determined with the “calibrated droplet” method. As of October 31, 2018 the quantity of microorganisms was as follows, U/ml: small flagellates – 44,015; free swimming infusoria – 34,233; Euglypha – 6,520; Vorticella – 27,713; Rotatoria – 29,343; Aspidiska – 36,950; Aelosoma – 2,173; Heliozoa – 1,086. No filamentous microorganisms were detected. After treatment, the recovered water was characterized by the following indicators of the quality: transparent, ammonium nitrogen content in water was less than 0.1 mg/l, phosphate ion content was no higher than 0.2 mg/l; COD was no higher than 30 mg O2/l, hydrogen index was about pH = 7. These indicators comply with the requirements for water in technical water supply systems of industrial enterprises (Russia), as applied to recovered water produced of wastewater for subsequent use in recycled water supply system. The treated water is reused in the production processes, which evidences high quality of water treatment and reliable operation of the equipment in local treatment facilities at “Food Ingredients” LLC during 10 years of operation.
Źródło:
Journal of Ecological Engineering; 2019, 20, 7; 70-78
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Vegetable Oils for the Friction Pair Modificated With a Boron
Zastosowanie olejów roślinnych w modyfikowanych borem węzłach ślizgowych
Autorzy:
Szczypiński-Sala, W.
Lubas, J.
Powiązania:
https://bibliotekanauki.pl/articles/189852.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
vegetable oils
friction
boron surface layer
oleje roślinne
tarcie
modyfikacja borem
Opis:
In the article, the results of the conducted research were discussed, and the aim was the evaluation of the characteristics of the operation of sliding pairs when vegetable oils are used for lubrication. Particularly, friction pairs with hard layers containing boron were taken into account. For comparison, two of the most common vegetable oils were used during the tests. Rapeseed oil was chosen, since it is most frequently applied in Europe, soybean oil was chosen due to its occurrence in North American areas. The oils are also applied in industry for commercial aims as oil bases for lubricants. The products based on vegetable oils can constitute an alternative for those of mineral origin. However, vegetable oils are characterized by different properties than mineral oils. The most essential issue is the fact that biolubricants are free of sulphurcontaining compounds that can have an unfavourable influence on the health of human beings. The wear measurements were conducted on a block-on-ing test stand T-05. In the sliding pair lubricated with vegetable oils, steel specimen interacted with a counterpart made of bearing alloy. In the second variant of a friction pair, a steel ring specimen with a boronized surface layer was used. The changes of the surface roughness of the specimen and counterpart during operation were evaluated. In the comparative evaluation, the best results were obtained choosing the sample with the hard layer lubricated with soybean oil. In this case, the observed wear of the surface of sliding pairs was the lowest. The lowest friction force and the lowest temperature of the elements of the friction pair also corresponded to this. The application of the TiB2 layer allows reducing the wear of both the sample with the layer and the counterpart with the bearing alloy layer.
W artykule omówiono wyniki przeprowadzonych badań, których celem była ocena charakterystyki pracy węzłów ślizgowych, do których smarowania zastosowano oleje roślinne. Podczas testów w celu porównania wykorzystano dwa najbardziej rozpowszechnione oleje roślinne. Wybrano jako najczęściej znajdujący zastosowanie na terenach europejskich olej rzepakowy oraz wykorzystywany w warunkach amerykańskich olej sojowy. Oleje te znajdują zastosowanie również w przemyśle do celów komercyjnych jako bazy olejów smarowych. Produkty oparte na olejach roślinnych stanowić mogą alternatywę dla tych pochodzenia mineralnego. Oleje roślinne charakteryzują się jednak odmiennymi właściwościami niż oleje mineralne. Najbardziej istotną kwestią jest to, iż nie zawierają one składników mogących niekorzystnie oddziaływać na zdrowie istot żywych. Pomiary sił tarcia i zużycia węzła smarowanego tymi olejami wykonano na testerze typu klocek--rolka T-05. W smarowanym olejami roślinnymi węźle współpracowała pierścieniowa próbka stalowa z przeciwpróbką pokrytą stopem łożyskowym. W drugim wariancie pary ciernej zastosowano pierścieniową próbkę stalową, na której zastosowano borowanie w postaci warstwy TiB2. Ocenie poddano zużycie współpracujących elementów oraz zmiany chropowatości ich powierzchni w trakcie pracy. W badaniach porównawczych najlepsze rezultaty uzyskano dla próbek z naniesioną powłoką TiB2 smarowanych olejem sojowym. W tym przypadku zużycie elementów pary ciernej było najmniejsze. Odpowiadały temu również najmniejsze wartości siły tarcia i temperatury podczas pracy.
Źródło:
Tribologia; 2018, 279, 3; 139-146
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The non-normative tests of the operational suitability of biodegradable hydraulic oils
Pozanormatywne badania przydatności eksploatacyjnej biodegradowalnych olejów hydraulicznych
Autorzy:
Rogoś, Elżbieta
Powiązania:
https://bibliotekanauki.pl/articles/188223.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
vegetable oils
biodegradable hydraulic oils
operational properties
oleje roślinne
biodegradowalne oleje hydrauliczne
właściwości eksploatacyjne
Opis:
The paper presented the results of tests on the operational properties of industrial oils based on plants carried out by methods not covered by subject standards. It was a method for testing the thermo-oxidative resistance of oils using an actual hydraulic stand and a method for testing the resistance of oils to the action of microorganisms in an aqueous environment. The results of tests on biodegradable hydraulic oil based on a mixture of rapeseed and castor oil were presented. The usefulness of methods for assessing the operational properties of oils was demonstrated, in particular at the stage of composition.
W pracy przedstawiono wyniki badań właściwości eksploatacyjnych olejów przemysłowych na bazie roślinnej, realizowanych metodami nieobjętymi normami przedmiotowymi. Była to metoda badania odporności termooksydacyjnej olejów z wykorzystaniem rzeczywistego stanowiska hydraulicznego oraz metoda badania odporności olejów na działanie mikroorganizmów w środowisku wodnym. Przedstawiono wyniki badań biodegradowalnego oleju hydraulicznego na bazie mieszaniny oleju rzepakowego i rycynowego. Wykazano przydatność metod do oceny właściwości eksploatacyjnych olejów, w szczególności na etapie komponowania.
Źródło:
Tribologia; 2019, 288, 6; 87-94
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the fluorescence excitation and emissions spectra of heated and frying rapeseed oil and sunflower oil
Autorzy:
Szukay, Beata
Stachura, Wojciech
Saletnik, Łukasz
Budzyński, Jacek
Szymańska, Justyna
Fisz, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/410481.pdf
Data publikacji:
2019
Wydawca:
Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:
fluorescence spectroscopy
vegetable oils
deep frying
spektroskopia fluorescencyjna
oleje roślinne
smażenie zanurzeniowe
Opis:
Frying is a popular method of cooking (meals preparation). Heating and deep-fat frying cause a series of chemical reactions, such as oxidation of polyunsaturated fatty acids and vitamin E, as well as formation of trans isomers and products of peroxidation. These chemical reactions cause organoleptic and nutritional changes in the product, which may have a negative effect on health. For this reason, the usefulness of many methods for evaluation of refined oils quality is investigated. The fluorescence spectroscopy is increasingly used for this purpose. The aim of the study was to monitor the changes in emission and excitation spectra of refined rapeseed oil and sunflower oil after processes of heating and frying frozen French fries. The obtained results show the differences between the shapes of fluorescence excitation and emission spectra of both oils due to the two processes and these changes depend on duration of both processes. This study indicates that fluorescence spectroscopy is a promising method for evaluation of changes in oils during heating or frying.
Źródło:
Biotechnology and Food Science; 2019, 83, 1; 49-56
2084-0136
2299-6818
Pojawia się w:
Biotechnology and Food Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biopolyols as ecological lubricant
Biopoliole jako ekologiczne bazy substancji smarowych
Autorzy:
Sułek, M. W.
Dąbrowski, Z.
Szczerek, M.
Drabik, J.
Rogoś, E.
Powiązania:
https://bibliotekanauki.pl/articles/188405.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
lubricants
vegetable oils
biopolyols
tribological properties
substancje smarowe
oleje roślinne
biopoliole
właściwości tribologiczne
Opis:
Vegetable oils are characterized by high lubricity. Their applications are limited due to their low stability, particularly at high temperatures and in the presence of an oxidizing agent, e.g., atmospheric oxygen. A new approach has been proposed to obtain vegetable oil derivatives with higher stability. The approach consists in the epoxidation and then hydroxylation of the oils. These reactions resulted in obtaining a biopolyol in which double bonds were substituted by isopropyl alcohol. The biopolyol obtained was tested on a four-ball apparatus. The tests were carried out at a constant load, and the seizure tests were performed at a load increasing at a constant rate. The results obtained were compared with those for castor, sunflower, and rapeseed oils used in lubrication. It was found that biopolyol exhibited comparable or even better lubricating properties than the reference oils.
Oleje roślinne charakteryzują się wysoką smarnością. Ich szerokie stosowanie jest ograniczone ze względu na niską trwałość, szczególnie w wysokich temperaturach i w obecności czynnika utleniającego, na przykład tlenu atmosferycznego. W celu otrzymania pochodnych olejów roślinnych o wyższej trwałości zaproponowano nowe podejście, które polega na reakcji epoksydowania, a następnie hydroksylowania tych olejów. W wyniku tych reakcji otrzymano biopoliol, w którym wiązania podwójne podstawiono alkoholem izopropylowym. Otrzymany biopoliol poddano badaniom na aparacie czterokulowym. Wykonano testy przy stałym obciążeniu oraz testy zatarcia przy wzrastającym ze stałą szybkością obciążeniu węzła tarcia. Uzyskane rezultaty odniesiono do stosowanych w technice smarowniczej olejów: rycynowego, słonecznikowego i rzepakowego. Stwierdzono, że biopoliol charakteryzował się porównywalnymi, a nawet korzystniejszymi właściwościami smarnymi w porównaniu z olejami referencyjnymi.
Źródło:
Tribologia; 2016, 270, 6; 159-166
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł

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