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    Wyświetlanie 1-9 z 9
    Tytuł:
    Phenolic Extracts from Vaccinium corymbosum L. Loaded in Microemulsions and Liposomes as Enhancers of Olive Oil Oxidative Stability
    Autorzy:
    Liović, Nikolina
    Bošković, Perica
    Drvenica, Ivana
    Režek Jambrak, Anet
    Dropulić, Ana Marija
    Krešić, Greta
    Nedović, Viktor
    Bugarski, Branko
    Zorić, Zoran
    Pedisić, Sandra
    Bilušić, Tea
    Powiązania:
    https://bibliotekanauki.pl/articles/1369546.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    phenolics blueberry
    microemulsions
    liposomes
    Antioxidant
    ultrasound
    Opis:
    Natural phenolic compounds are recognized as bioactive ingredients in food but can also have a role as effective alternatives to synthetic antioxidants in stability improvement of foods prone to oxidation, such as edible oils. This study aimed at the preparation and HPLC-DAD characterization of phenolic extracts from Vaccinium corymbosum L. (raw, pasteurized, freeze-dried and treated with high-intensity ultrasound), and at testing their antioxidant potential in the prevention of olive oil oxidation in the native state and encapsulated into microemulsions and liposomes systems. Water-in-oil structured microemulsions used in this study were prepared using mechanical, ultrasonic, and high pressure homogenization. Liposomes with the average size of 589.1±2.9 nm were produced with the proliposome method using commercially available phosphatidylcholine – Phospolipon 90G. The obtained results showed significant prolongation of the oxidative stability of extra virgin olive oil enriched with encapsulated blueberry phenolic extracts than with native phenolic extracts, regardless of the method used for blueberry processing. Phenolic extracts encapsulated in microemulsions had a stronger effect on the prolongation of olive oil oxidative stability in comparison with the extracts encapsulated in liposomes. The average prolongation rate of oxidative stability was 45.65% by phenolic extracts encapsulated in microemulsions prepared by mechanical homogenization (p=0.012), and 58.72% by microemulsions prepared by ultrasound homogenization (p=0.011). Phenolic extracts encapsulated in microemulsions prepared by high pressure homogenization had no effect on oil oxidative stability prolongation.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2019, 69, 1; 23-33
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some aspects using of micro emulsion fuel-water for supply of combustion engines
    Autorzy:
    Jankowski, A.
    Sowa, K.
    Zabłocki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/245346.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    diesel engines
    combustion processes
    ecology
    emulsion
    microemulsions
    Opis:
    The emulsion is a mixture of two or more insoluble liquids. Microemulsion is the emulsion with particles dimension in a range of one micrometer and smaller. Such a microemulsion of water and diesel fuel will create a novel quality and allows one to simultaneously achieve environmental and economic effects, as well as eliminate the adverse impact of normal emulsions, or adverse effects of water injection into the engine intake system or directly into the combustion chamber, as well as the sequential injection of water directly into the combustion chamber. Application of microemulsion of water and diesel to fuel diesel engine positively affects the combustion process through the catalytic impact of microparticles of water and to improve the process of preparation of the microemulsion injection into the combustion chamber as a result of water microparticles microexplosions. This article presents the investigation results of an internal combustion engine fuelled by an emulsion of water and diesel fuel and also fuelled by emulsion of FAME and water. It therefore seems appropriate to a strong increase in the degree of dispersion of water droplets in the emulsion by applying the methods to obtain the size of water droplets on nanometric range. This should dramatically improve both the stability of emulsion and its influence on the chemical effects of combustion in diesel engine. The performed analysis and investigation is the first stage of work, which is aimed to reduce emissions of PM and NOx simultaneously. It seems that the simultaneous reduction in emissions is possible through the usage of a stable emulsion, i.e. water-fuel microemulsion.
    Źródło:
    Journal of KONES; 2009, 16, 4; 531-538
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of chosen parameters of water fuel microemulsion on combustion processes, emission level of nitrogen oxides and fuel consumption of CI engine
    Autorzy:
    Jankowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/247478.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    diesel engines
    combustion process
    ecology
    emulsion
    microemulsions
    Opis:
    The microemulsion is the emulsion with dimension of molecules approx. micrometre and smaller. Such microemulsion of water and diesel oil creates new quality and lets on obtainment ecological and economic of effects, as well as eliminates the disadvantageous influence common emulsions, or unprofitable effects of the injection of water to inlet system of the engine, direct to combustion chambers, as well as the sequential injection of water direct to combustion chambers. The essence of apply of the microemulsion is also improve catalytic influence of small molecules of water on combustion process, what, beside decreasing temperature combustion gases, influences both emission level components of toxic combustion gases, as and the level of the specific fuel consumption. The paper presents different ways of microemulsion production, novel way of microemulsion production, which does not demand apply of mixers and suffers obtainment of microemulsion with the volumetric content of water in diesel oil do 40% under conditions of laboratory and stabile the microemulsion with content of water in diesel oil to 25%. Results of laboratory research involving basic parameters of the microemulsion and engine researches with measurements emission ingredients of toxic exhaust gases and fuel consumptions are presented involving basic parameters of the microemulsion and engine researches with measurements emission ingredients (NOx, soot, fuel consumption) of toxic exhaust gases and fuel consumptions are presented in the paper.
    Źródło:
    Journal of KONES; 2011, 18, 4; 593-600
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microemulsion as a means of NOx reduction in exhaust emission of diesel engines
    Autorzy:
    Jankowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/247510.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    internal combustion engines
    engine emissions
    internal combustion engine fuels
    microemulsions
    Opis:
    Currently produced internal combustion engines used in transportation, must meet very stringent legislative requirements EURO VI, for the limited emissions of exhaust gases: CO, HC, NOx, PM, PN. One of the most toxic components and the most difficult to eliminate are nitrogen oxides NOx, which currently permissible amount in the exhaust gases shall be 80 mg/km. This result must be achieved, moreover, with the fulfilment of the limits for other exhaust components, and above all, the contents of particulate matter (PM, PN). It should be pointed out, that the mechanisms of the NOx and PM formation are opposed to each other; reduction of the NOx amount is generally associated with an increase in PM and vice versa. Therefore, issues of lowering the amount of NOx in the exhaust gases devote a lot of scientific work and engine research. Currently the most effective method of reducing the NOx is the selective catalytic reduction (SCR), which requires the additional installation of sophisticated equipment in the vehicle. Therefore, methods easier to implement and to operate are sought. One such method is the use of a microemulsion to supply as fuel to diesel engines, consisting of an emulsion of diesel oil, water and surfactant (surface-active compound). The use of the microemulsion results in that already in combustion chamber forms less of NOx, and therefore reduction of NOx in the exhaust system is easier. The publication presents results of SB 3.1 engine research on the engine test bench. The research was comparative in nature and thus, in the first stage of research conducted, the engine was fuelled with diesel oil, then the area of engine load and engine speed characteristics, in which the NOx emissions are greatest, was determined, and next, when engine was fuelled with various microemulsions, the engine investigation was conducted in this area. The microemulsions of diesel fuel and water comprise 10%, 20% and 30% water, selectively. The results of investigations show that, when the engine is fuelled with microemulsions, both NOx and PM, as the main component of diesel engine exhaust - soot (smoke) can be reduced at the same time. The article also discusses the differences between emulsions and microemulsions, and how they influence the combustion in the engine combustion chambers.
    Źródło:
    Journal of KONES; 2016, 23, 3; 225-232
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microemulsions Based on Propylene Glycol Diesters of Caprylic and Capric Acids
    Autorzy:
    Jaworska, M.A.
    Sikora, E.S.
    Ogonowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779236.pdf
    Data publikacji:
    2013
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Propylene Glycol Dicaprylate/Dicaprate (Crodamol PC),
    nanoemulsions
    microemulsions
    low energy method
    Opis:
    The aim of this work was preparation and characterization of o/w nano and microemulsions containing Crodamol PCŽ as the oil phase. An influence of surfactants system applied in formulations on the properties of the obtained emulsions has been studied. The emulsions were prepared by phase inversion composition method. The measurement of the internal phase droplet size and the study of rheological properties were done. The obtained results showed that the prepared transparent emulsion systems are nano and microemulsion formulation. Moreover, it was concluded that the microemulsions stability and the size of the internal phase droplets depended on the type and the concentration of emulsifier and on the ratio of water phase to oil. Rheological studies have confirmed that the obtained microemulsions showed pseudoplastic behaviour.
    Źródło:
    Polish Journal of Chemical Technology; 2013, 15, 1; 68-73
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nitrogen Oxides Emissions from a Diesel Engine Fuelled with Water-Diesel Microemulsions
    Autorzy:
    Górska, Milena
    Skrzek, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/102301.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    diesel engine
    nitrogen oxides
    fuel microemulsions
    silnik wysokoprężny
    tlenki azotu
    mikroemulsje paliwowe
    Opis:
    In this study, an experiment was conducted to examine the AVL research diesel engine using two kinds of waterdiesel (W-D) fuel microemulsions. These W-D mixtures contained 3.5 and 7.0% by volume (%, v/v) of distilled water dispersed in regular diesel fuel meeting the requirements of the EN590 standard. The engine was tested under the conditions of low, moderate and higher loads. This research was focused on the emission characteristics of nitrogen dioxide (NO2 ) and nitrogen monoxide (NO). Cumulative emission of NOx was also analyzed before being further discussed. The obtained results of this study showed that the addition of distilled water to the regular diesel fuel has a minor effect on the variation of the nitrogen oxides emission. It was confirmed that NO is the main component of NOx detected in the exhaust stream of the AVL engine fuelled with all tested fuels. It proves that the thermal mechanism of the nitrogen oxides formation was dominant in the combustion process. Moreover, it was found that the addition of water dispersed as microemulsion in diesel fuel had a minor effect on the reduction of the NOx emission.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 3; 83-92
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microemulsions as Carriers of Omega-3 Polyunsaturated Fatty Acids
    Mikroemulsje jako nośniki kwasów tłuszczowych omega-3
    Autorzy:
    GÓRSKA, Anna
    KRUPA, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1033822.pdf
    Data publikacji:
    2013
    Wydawca:
    Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
    Tematy:
    docosahexaenoic acid (DHA)
    eicosapentaenoic acid (EPA)
    functional foods
    microemulsions
    microencapsulation
    α-linolenic acid
    Opis:
    Design of novel foodstuffs rich in natural bioactive substances is one of the main research field in the food industry. There are many clinical reports on beneficial effects of either docosahexaenoic acid (DHA) or eicosapentaenoic acid (EPA) on health. In general n-3 polyunsaturated fatty acids (n-3 PUFAs) are significant structural components of cell membranes. Since DHA and EPA represent exogenous fatty acids, their level in the human body depends on the dietary intake. Therefore there is a need to enrich food by bioactive compounds. It has been shown that the application of polyunsaturated fatty acids such as α-linolenic acid in traditional foodstuffs permits to obtain a kind of functional food that can be used to improve both health and skin condition. However low stability of natural bioactive components limits their application in food, especially on an industrial scale. Due to this fact efforts are made to prepare new functional food formula containing n-3 PUFAs in a stable form. Microencapsulation process is a well known attempt to prevent their oxidation. Preparation of food-grade microemulsions containing polyunsaturated fatty acids to improve the stability and to ensure pleasant sensory properties of food is discussed in the present study.
    Źródło:
    Medicina Internacia Revuo; 2013, 25, 101; 211- 219
    0465-5435
    Pojawia się w:
    Medicina Internacia Revuo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości korozyjne wybranych mikroemulsji paliwowych do silników o zapłonie samoczynnym
    The corrosion properties of selected fuel microemulsions for diesel engines
    Autorzy:
    Chmielewski, Z.
    Stobiecki, J.
    Górska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/313697.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    właściwości paliw
    korozja
    mikroemulsje paliwowe
    surfaktanty
    kosurfaktanty
    fuels properties
    corrosion
    fuel microemulsions
    surfactants
    cosurfactants
    Opis:
    Artykuł przedstawia wyniki badań wybranych mikroemulsji paliwowych. W szczególności skupiono się na ocenie ich właściwości korozyjnych. Niezbędne badanie wykonano zgodnie z wymaganiami normy ASTM D130 dla mikroemulsji paliwowej zawierającej 4 oraz 8 % objętościowo wody destylowanej, którą rozproszono w oleju napędowym. Na podstawie rezultatów przeprowadzonych badań można stwierdzić, że obydwie badane mikroemulsje paliwowe miały niekorzystne właściwości korozyjne w porównaniu do oleju napędowego.
    The paper presents research results of selected fuel microemulsions. In particular the corrosion properties of these microemulsions were investigated. Necessary research was carried out in line with requirements of ASTM D130 standard for fuel microemulsions containing 4 and 8 % by volume of distillated water dispersed in diesel oil. On the base of research results, it can be stated that both tested fuel microemulsions had unfavourable corrosion properties when compared to diesel oil and distillated water.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 12; 407-410
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Investigation of a Diesel Engine Powered with Fuel Microemulsion
    Autorzy:
    Górski, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/102265.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    diesel engine
    soot emissions
    fuel microemulsions
    alternative fuel
    silnik wysokoprężny
    emisja sadzy
    mikroemulsje paliwowe
    paliwo alternatywne
    Opis:
    The paper presents the research results of the AVL diesel engine powered with microemulsion fuels. In particular the emission of soot particles from the engine operated under stationary conditions was investigated. The necessary tests were carried out for two microemulsions containing 3.5 and 7% by volume of distilled water dispersed in diesel fuel with necessary surfactants/cosurfactants, i.e. Crillet-6/Span-20. Both tested microemulsions contained similar water micelles size distribution with average dimension of 18 nm. The results of the investigation confirmed that the combustion of tested water – fuel microemulsion in the AVL research engine reduces the emission of soot particles even by 50% in comparison with the diesel fuel.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 2; 41-48
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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