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Tytuł:
DIPSACUS FULLONUM L. LEAVES AND ROOTS - IDENTIFICATION OF THE COMPONENTS OF THE ESSENTIAL OILS AND ALPHA-AMYLASE INHIBITORY ACTIVITIES OF METHANOLIC EXTRACTS
Autorzy:
Witkowska-Banaszczak, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/895320.pdf
Data publikacji:
2018-08-31
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
essential oil composition
methanolic extract
alpha-amylase inhibition
Opis:
Abstract: Dipsacus fullonum L. syn. D. sylvestris is a biennial plant from the Dipsacaceae family. It grows in Europe, North Africa and Asia Minor. It has been used in folk medicine mainly to treat Lyme disease. This study was undertaken to identify and compare the components of the essential oils from dried and fresh roots, which are usually applied as medicinal agents, as well as those of the essential oils from dried and fresh leaves, used less frequently. The essential oils from the Dipsacus fullonum leaves and roots were analysed by the GC and GC-MS analysis. 18 components were identified in the essential oil from the fresh leaves, whereas 37 were recognised in the oil from the dried leaves; 10 components were identified in the essential oil from the fresh roots and 40 in that from the dried roots. Phytol was the main component in the essential oil from the leaves, whereas n-hexadecanoic acid was predominant in the roots. The α -amylase inhibition has been proven for methanolic extracts of D. fullonum leaves and roots. The strongest activity was demonstrated by the extract from fresh leaves of D. fullonum and showed an effect about one hundred times weaker than acarbose.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2018, 75, 4; 951-957
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical Composition and Antibacterial activity of Essential Oil of Marrubium vulgare from Eastern Algeria
Autorzy:
Abadi, A.
Hassani, A.
Powiązania:
https://bibliotekanauki.pl/articles/411975.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Marrubium vulgare
Essential oil composition
GC-MS
antibacterial activities
Opis:
The essential oil from flowering Marrubium (Marrubium vulgare L.) an aromatic member of the Lamiaceae family, from Algeria, obtained by hydrodistillation, was analysed by GC/FID and GC/MS. The constituents were identified by their mass spectra and Kovats’ indices. Fivety (50) components in the oil of M. vulgare were identified. The results demonstrated that the major components of the essential oil were: 4,8,12,16-Tetramethyl heptadecan-4-olid (16.97 %), Germacrene D-4-ol (9.61 %), α- pinéne (9.37 %), Phytol (4.87 %), Dehydro-sabina ketone (4.12 %), Piperitone (3.27 %), δ-Cadinene (3.13 %), 1-Octen-3-ol (2.35 %) and Benzaldehyde (2.31 %). Essential oil of M vulgare was evaluated for its antibacterial activities against Gram-positive and Gram negative pathogenic bacteria: Bacillus subtilis, Micrococcus luteus, Escherichia coli and Klebsiella pneumoniae.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 10, 1; 61-69
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oil content and composition in seeds of Camelina sativa and Crambe abyssinica cultivars
Autorzy:
Marsalkiene, N.
Zilenaite, L.
Karpaviciene, B.
Powiązania:
https://bibliotekanauki.pl/articles/1192479.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
Tematy:
oil composition
glucosinolate
fatty acid
erucic acid
linolenic acid
Opis:
The aim of the study was to evaluate seed oil content and oil composition in five Camelina sativa and four Crambe abyssinica cultivars as an interaction of a genotype and the climatic conditions in Lithuania. The studied species differed in the seed oil content, glucosinolate content in oil and oil fatty acid composition. The oil content was 22.1-42.5% in dry matter of camelina seeds and 23.4-36.6% in crambe seeds. The glucosinolate content varied from 61.8 to 68.6 µmol g-1 in oil of crambe, and from 8.6 to 30.5 µmol g-1 in oil of camelina. The oil content in seeds and glucosinolate content in oil of each species differed between the research years but not between the cultivars. The glucosinolate content in oil correlated significantly with the oil content in dry matter of seeds. However, this correlation was negative for camelina (rs=-0.59, p=0.045) and positive for crambe (rs=0.86, p=0.007). Camelina oil was characterised by the dominance of linolenic acid (34.8-41.6%), while crambe oil was predominated by erucic acid (53.0-60.9%). The second most abundant fatty acid in oil of both species was oleic acid, whose amount did not differ between the species. At the same time, the content of all other studied fatty acids differed significantly between both species. Our study indicated that variation in seed oil content, glucosinolate content and fatty acid composition in each studied species was much less affected by inheritable features of cultivars than by meteorological conditions in the research years.
Źródło:
Journal of Elementology; 2020, 25, 4; 1399-1412
1644-2296
Pojawia się w:
Journal of Elementology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Essential oil composition and antioxidant activity of Marrubium vulgare L. growing wild in Eastern Algeria
Autorzy:
Abadi, A.
Hassani, A.
Powiązania:
https://bibliotekanauki.pl/articles/412455.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Marrubium vulgare
Lamiaceae
Essential oil composition
GC
GC-MS
antioxidant
Opis:
In previous work [1], the essential oil of the aerial parts of Marrubium vulgare L. obtained by hydrodistillation was analysed by gas chromatography coupled to mass spectrometry (GC-MS) in order to determine their chemical composition. Fifty (50) components in the oil of M. vulgare were identified. The results demonstrated that the major components of the essential oil were: 4,8,12,16-Tetramethyl heptadecan-4-olid (16.97 %), Germacrene D-4-ol (9.61 %), α- pinéne (9.37 %), Phytol (4.87 %), Dehydro-sabina ketone (4.12 %), Piperitone (3.27 %), δ-Cadinene (3.13 %), 1-Octen-3-ol (2.35 %) and Benzaldehyde (2.31 %). In this study, the antioxidant properties of essential oil were examined. The results showed that this oil can be considered an effective source of antioxidants of natural origin. This is the first report on chemical composition of M. vulgare essential oil cultivated in Algeria and the original study on the antioxidant activity of M. vulgare essential oil. The antioxidant activity was investigated with one method: 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging method.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 9, 1; 17-24
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The antioxidant and antibacterial activities of the essential oils of Marrubium vulgare growing wild in Eastern Algeria
Autorzy:
Abadi, A.
Abdellatif, F.
Powiązania:
https://bibliotekanauki.pl/articles/412468.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Marrubium vulgare
Essential oil composition
GC-MS
antibacterial activities
antioxidant
Opis:
The chemical composition was analyzed by gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS). The constituents were identified by their mass spectra and Kovats’ indices. Fivety (50) components in the oil of M. vulgare were identified. The results demonstrated that the major components of the essential oil were : 4,8,12,16-Tetramethyl heptadecan-4-olid (16.97 %), Germacrene D-4-ol (9.61 %), α- pinéne (9.37 %), Phytol (4.87 %), Dehydro-sabina ketone (4.12 %), Piperitone (3.27 %), δ-Cadinene (3.13 %), 1-Octen-3-ol (2.35 %) and Benzaldehyde (2.31 %). The antioxidant activity of the oils was assessed by measurement of metal chelating activity, the reductive potential, the free radical scavenging (DPPH) assay. The antioxidant activity was compared with that of synthetic antioxidants: butylated hydroxyanisole (BHT) , and the essential oils . The results showed as the Essential oil of M vulgare was evaluated for its antibacterial activities against Gram-positive and Gram negative pathogenic bacteria: Listeria monocytogene, Pseudomonas aeruginosa , Agrobacterium tumefaciens and Salmonella enterica.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 10, 2; 159-166
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of distillation time on the content and composition of essential oil isolated from wild thyme (Thymus serpyllum L.)
Wpływ czasu destylacji na zawartość i skład olejku eterycznego wyizolowanego z macierzanki piaskowej (Thymus serpyllum L.)
Autorzy:
Wesolowska, A.
Jadczak, D.
Grzeszczuk, M.
Powiązania:
https://bibliotekanauki.pl/articles/71810.pdf
Data publikacji:
2012
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
distillation time
essential oil content
oil composition
isolation
wild thyme
thyme
Thymus serpyllum
hydrodistillation
carvacrol
Opis:
The influence of the time of distillation on the content and composition of essential oil isolated from wild thyme (Thymus serpyllum L.) by hydrodistillation was investigated. The GC-MS data showed that the essential oil was rich in carvacrol (30.90–46.16%) and its biogenetic precursors γ-terpinene (5.72–9.09%) and p-cymene (4.51–13.46%). Other constituents identified in significant amounts were β-caryophyllene, carvacrol methyl ether and (-)-β-bisabolene. On the basis of the obtained data it was proved that time of distillation had no effect on essential oil content. Moreover, there was no significant effect of the distillation time on the content of essential oil constituents found in the experiment.
Zbadano wpływ czasu destylacji na zawartość i skład olejku eterycznego wyizolowanego z macierzanki piaskowej (Thymus serpyllum L.) na drodze hydrodestylacji. Analiza GCMS wykazała, że olejek eteryczny zawierał dużo karwakrolu (30,90–46,16%), γ-terpinenu (5,72–9,09%) i p-cymenu (4,51–13,46%). Pozostałe składniki zidentyfikowane w znacznych ilościach w olejku to β-kariofilen, eter metylowy karwakrolu i (-)-β-bisabolen. Na podstawie uzyskanych wyników wykazano, że czas destylacji nie miał wpływu na zawartość olejku eterycznego, co więcej nie miał też istotnego wpływu na zawartość głównych składników olejku.
Źródło:
Herba Polonica; 2012, 58, 4
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of essential oil composition by GC-MS and integral antioxidant capacity using photochemiluminescence assay of two Thymus leaves: Thymus syriacus and Thymus cilicicus from different Syrian locations
Określenie składu olejku eterycznego za pomocą GC-MS oraz łącznej zdolności antyoksydacyjnej metodą fotochemoluminescencyjną w liściach Thymus syriacus i Thymus cilicicus rosnących w różnych miejscach w Syrii
Autorzy:
Zayzafoon, G.
Odeh, A.
Allaf, A.W.
Powiązania:
https://bibliotekanauki.pl/articles/72658.pdf
Data publikacji:
2012
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
determination
essential oil
oil composition
antioxidant capacity
photochemiluminescence
leaf
Thymus syriacus
Thymus cilicicus
Syria
location
gas chromatography-mass spectrometry
Opis:
The Syrian Thymus cilicicus (Th. cilicicus) Boiss & Bal. and Thymus syriacus (Th. syriacus) Boiss chemical components were identified using GC-MS spectrometry. Sixteen constituents representing an average of 93.85% of the essential oil from Syrian Thymus cilicicus were characterized. The major average components in four collection rounds of Thymus cilicicus around the year were: thymol, carvacrol, γ-terpinene, carvyl acetate, dihydrocarvone and anis aldehyde. Eighteen components representing an average of 93.46% of the essential oil of Thymus syriacus were characterized. The major average components in four collection rounds of Thymus syriacus around the year were: carvacrol, dihydrocarvone, β-caryophyllene, p-cymene, farnesol, limonine, menthol, myrecene, γ-terpinene, terpinene- 4-ol and thymol. The integral antioxidant capacity of aqueous and essential oils extracts of both Thymus species: Th. syriacus and Th. cilicicus have been determined by means of a photochemiluminescence assay (PCL). The highest integral antioxidant capacity has been found for Th. syriacus and Th. cilicicus in Fahel mountain and Salah Aldin locations which have a value of total nmol equivalent per gram of dry material at 374.6 ± 0.94 and 475.80 ± 1.20 nmol TE/g DM, respectively.
Składniki chemiczne Thymus cilicicus (Th. cilicicus) Boiss & Bal. and Thymus syriacus (Th. syriacus) Boiss rosnących w Syrii określono za pomocą spektrometrii GC-MS. Znaleziono i opisano 16 składników stanowiących średnio 93,85% olejku eterycznego Thymus cilicicus. Głównymi składnikami stwierdzonymi w materiale zebranym czterokrotnie w ciągu roku były: tymol, karwakrol, γ-terpinen, octan karwylu, dihydrokarwon i aldehyd anyżowy. Scharakteryzowano 18 składników stanowiących średnio 93,46% olejku eterycznego Thymus syriacus. Ważniejszymi składnikami stwierdzonymi w materiale zebranym czterokrotnie w ciągu roku były: karwakrol, dihydrokarwon, β-kariofilen, p-cymen, farnezol, limonin, mentol, myrecen, γ-terpinen, terpinen-4-ol i tymol. Najwyższa łączna zdolność antyoksydacyjna została znaleziona w Th. syriacus i Th. cilicicus zebranych w górach Fahal i w Salah Aldin. Wartość ta wyrażona jako łączny ekwiwalent antyoksydacyjny w nanomolach na gram suchego materiału wynosiła odpowiednio 374,6±0,94 i 47,80±1,20 nmola TE/g DM.
Źródło:
Herba Polonica; 2012, 58, 4
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Waste tires as a source of valuable chemicals
Autorzy:
Ambrosewicz-Walacik, M.
Walacik, M.
Powiązania:
https://bibliotekanauki.pl/articles/244309.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
waste tyres
pyrolysis
pyrolytic oil
chemical composition
Opis:
The aim of the study was to determine the possibility of the isolation of valuable chemical compounds from pyrolysis oil obtained from the pyrolyzed waste car tires. Produced pyrolysis oil were subjected to a distillation process to isolate medium naphtha fraction average naphtha that contains limonene, which according to the literature data, can be used as an environmental friendly solvent in a number of cleaning agents. Considering the boiling point of limonene (176°C), the medium fraction of the separated oil was re-distilled to isolate compounds with temperature of boiling point between 174-177°C. The prepared sample was analysed by gas chromatography coupled with mass spectroscopy. Based on the chromatographic analysis, it was found that in a separate sample of pyrolysis oil the highest share constituted toluene, and then cyclobutane, benzene derivatives, which is essential in the chemical industry. The share of limonene was low (approx. 1%), what is explained by too high temperature of the pyrolytic process. The results of analysis and literature allow unequivocally state that in order to separate specific compounds from pyrolytic oil, parameters of this process should be first determined in pilot studies. In conclusion, it is believed that the pyrolysis of tires is suitable method of disposing of the waste, thereby obtaining products containing valuable compounds for the fuel and chemical industries.
Źródło:
Journal of KONES; 2016, 23, 2; 25-29
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical composition of Scaligeria meifolia Boiss. essential oil from Iran
Skład chemiczny olejku eterycznego Scaligeria meifolia Boiss. rosnącego w Iranie
Autorzy:
Rowshan, V.
Tarakemeh, A.
Powiązania:
https://bibliotekanauki.pl/articles/71829.pdf
Data publikacji:
2013
Wydawca:
Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:
chemical composition
Scaligeria meifolia
aerial part
Apiaceae
essential oil
oil component
Iran
Opis:
Scaligeria meifolia Boiss., belonging to the Apiaceae family, grows wild in Iran. The essential oil from aerial parts of S. meifolia were obtained by hydrodistillation and analyzed by GC and GC/MS. Thirty-one constituents representing 99.98% of total oil components were identified. The main constituents of the essential oil were germacrene–D, (24.2%), germacrene-B (14.8%), limonene (14.2%), γ-elemene (11.6 %) and β-elemene (5.2%).
Scaligeria meifolia Boiss. należąca do rodziny Apiaceae, rośnie dziko w Iranie. Olejek eteryczny z nadziemnych części S. meifolia uzyskano i analizowano za pomocą GC i GC/MS. Zidentyfikowano 31 składników, co stanowi 99,98% wszystkich składników olejku. Najważniejszymi składnikami olejku eterycznego były: germakren-D (24,2%), germakren- B (14,8%), limonen (14,2%), γ-elemen (11,6%) i β-elemen (5,2%).
Źródło:
Herba Polonica; 2013, 59, 1
0018-0599
Pojawia się w:
Herba Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The modified Dräger probe to the geochemical research of the soil gases composition
Autorzy:
Fąfara, Z.
Ilkiv, I.
Sołecki, T.
Powiązania:
https://bibliotekanauki.pl/articles/299193.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
geochemical testing of soil gases composition
oil deposit
Opis:
The Dräger probe in the measurement set to the geochemical research of the soil gases composition is inconvenient to use. It's heavy, which are reąuired to operate at least two people. Cumbersome and time-consuming is to place it into the soil by impact method, and often there is fail to reach the planned measurement depth. For this reason, there was designed and made the new modified Dräger probe. The new probe has significantly lower mass and outer diameter. In principle it should be possible to introduce it into the soil by pushing, which will greatly facilitate and accelerate conducting the geochemical research of the soil gases composition.In the autumn of 2014 has been tested the modified Drager probe. The purpose of this study is to assess it suitability to conduct the geochemical research of the soil gases composition. In total there were performed 374 measurements of the soil gases composition at different depths in the 247 measurement points. In 99 cases (26.5%) there was failed to perform the measurement because the soil gases flow rate through the meter was too little. Pulling probe usually allowed to perform the research - in only 6 measurement points (2.4%), it was impossible. The average depth of the measurement point is equal to 0.78 m.
Źródło:
AGH Drilling, Oil, Gas; 2015, 32, 1; 89-102
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extraction of eucalyptus oil as reduction of bacterial growth in drinking water
Autorzy:
Dubey, A.K.
Sahu, O.
Powiązania:
https://bibliotekanauki.pl/articles/11148.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
extraction
eucalyptus oil
reduction
bacterial growth
drinking water
composition
essential oil
growth rate
microbe
Opis:
Drinking water is acting as life line for living thing on the Earth, without that no life. Due to global industrialization availability of pure water is one of the major issues. The effluent are directly or indirectly discharge through the river stream, which affect the ground as well as sea water and climatically cycle water reach to us. In that condition medicine are required for quire purpose. In the world so many plants and herbs are available which are used as antimicrobial and sources of medicines. Today the large number of drugs in use is derived from plants. The important advantages for therapeutic uses of medicinal plants in various ailments are their safety besides being economical, effective and easy availability. In this regard’s herb plant Eucalyptus extracted oil is used as antibacterial agent to treat the drinking water.
Źródło:
International Letters of Natural Sciences; 2014, 11, 2
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes of fatty acid composition in seed oil of rapeseed during first 96 hours of germination
Zmiany składu kwasów tłuszczowych oleju w nasionach rzepaku w pierwszych 96 godzinach kiełkowania
Autorzy:
Michalski, K.
Powiązania:
https://bibliotekanauki.pl/articles/832876.pdf
Data publikacji:
2006
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
fatty acid composition
seed oil
rapeseed
germination
fatty acid analysis
Brassica napus
composition change
genotype
Źródło:
Rośliny Oleiste - Oilseed Crops; 2006, 27, 1
1233-8273
Pojawia się w:
Rośliny Oleiste - Oilseed Crops
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the ultrasounds treatment on frying oils intended for biodiesel production
Autorzy:
Ambrosewicz-Walacik, M.
Szostak, P.
Nitkiewicz, S.
Tańska, M.
Walacik, M.
Powiązania:
https://bibliotekanauki.pl/articles/245084.pdf
Data publikacji:
2016
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
frying oil
ultrasounds
fatty acids composition
transesterification
yield of biodiesel
Opis:
The aim of the study was to determine the ultrasounds treatment of frying oil on their properties important in order to biodiesel production. The research material was a frying oil, which prior to transesterification oil was treated with ultrasounds (37 kHz) during 15, 30 and 60 min. In next step, prepared samples were analysed in terms of fatty acid composition, acid value, FFA % and then subjected to alkali transesterification process. After producing methyl esters the yield of biodiesel was analysed with thin liquid chromatography technique (TLC), and then samples were characterized in terms of viscosity in 40 °C, density at 15 °C, acid value, sulphur content and flash point. The results showed that an ultrasonic treatment had a little impact on the fatty acid composition of the test samples. The yield of biodiesel was the higher the longer time of ultrasounds treatment were used. One the other hand, determined with thin liquid chromatography technique yield of biodiesel was the higher the longer time of ultrasounds treatment were used. What is more, the ultrasounds treatment of oil before transesterification process had no impact on viscosity, density and acid value of these samples, while flash point values and sulphur content were changed.
Źródło:
Journal of KONES; 2016, 23, 3; 19-24
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical properties of rapeseed oil hydrogenated with Ni or Cu catalyst
Właściwości fizyczne oleju rzepakowego uwodornionego na katalizatorze miedziowym i niklowym
Autorzy:
Drozdowski, B.
Szukalska, E.
Powiązania:
https://bibliotekanauki.pl/articles/1398539.pdf
Data publikacji:
1985
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
rapeseed oil
copper catalist
nickel catalist
composition of fatty acids
Opis:
Hydrogenation of rapeseed oil proceeds according to different mechanisms when using copper and nickel catalyst. The products obtained exhibit different compositions of fatty acids which in turn influences their quality and nutritive and physical properties.
Prowadzono uwodornienie oleju rzepakowego wysokoerukowego w laboratoryjnym reaktorze typu „dead-end" na katalizatorze niklowym oraz miedziowym. Kinetykę reakcji charakteryzowały krzywe kinetyczne uwodornienia (rys. 1). Uzyskane produkty scharakteryzowano za pomocą składu KT, ze szczególnym uwzględnieniem izomerów geometrycznych o konfiguracji trans (tab., rys. 2). Uwodornione oleje poddano termicznej analizie różnicowej (rys. 3) oraz zbadano ich dylatację (rys. 5). Stwierdzono, że reakcja uwodornienia na Cu zachodzi według innego mechanizmu, niż na Ni. Na katalizatorze miedziowym uwodornieniu ulegają tylko kwasy polienowe, co w przypadku oleju rzepakowego odnosi się do kwasów 18-węglowych, natomiast na niklu wszystkie kwasy nienasycone biorą udział w procesie redukcji. Redukcja kwasów monoenowych, obserwowana na Ni powoduje wzrost zawartości kwasów nasyconych, głównie C18:0, C20:0 i C22:0. Również zawartość izomerów trans jest ok. 2,5 raza wyższa, niż na Cu (w próbach uwodornionych do tych samych liczb jodowych). W wyniku różnych mechanizmów reakcji, olej rzepakowy uwodorniony na Cu ma zdecydowanie niższą zawartość fazy stałej, aniżeli olej uwodorniony na Ni. Wskazują na to termogramy (rys. 3 i 4) oraz wartości współczynnika SFI (rys. 5 i 6). Powodem tego jest stosunkowo niewielkie stężenie izomerów geometrycznych w produkcie uwodornionym na Cu oraz niezmienny, w stosunku do surowca wyjściowego, poziom kwasów nasyconych. W konsekwencji tego, produkt pozbawiony kwasu linolenowego przez selektywne uwodornienie, zachowuje konsystencję ciekłą w temperaturze pokojowej (tab.).
Źródło:
Acta Alimentaria Polonica; 1985, 11, 2; 247-255
0137-1495
Pojawia się w:
Acta Alimentaria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality assessment of the essential oil from Eucalyptus globulus Labill of Blida (Algeria) origin
Autorzy:
Boukhatem, M. N.
Amine, F. M.
Kameli, A.
Saidi, F.
Walid, K.
Mohamed, S. B.
Powiązania:
https://bibliotekanauki.pl/articles/411538.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Eucalyptus globulus Labill
Chemical composition
Essential oil
Gas Chromatography
Eucalyptol
Opis:
Despite the reputation earned by aromatic and medicinal plants of Algeria, the chemical constituents of Eucalyptus globulus essential oil (EGEO) of Blida origin has not previously been investigated. Thus, the present study has been conducted for the determination of chemical constituents and different physico-chemical properties of the EGEO. Chemical composition of the EGEO, grown in Algeria, was analysed by Gas Chromatography-Mass Spectrometry. The chemical components were identified on the basis of Retention Time and comparing with mass spectral database of standard compounds. Relative amounts of detected compounds were calculated on the basis of GC peak areas. Fresh leaves of E. globulus on steam distillation yielded 0.96 % (v/w) of essential oil whereas the analysis resulted in the identification of a total of 11 constituents, 1.8 cineole (85.8 %), α-pinene (7.2 %), and β-myrcene (1.5 %) being the main components. Other notable compounds identified in the oil were β-pinene, limonene, α-phellandrene, γ-terpinene, linalool, pinocarveol, terpinen-4-ol, and α-terpineol. The physical properties such as specific gravity, refractive index and optical rotation and the chemical properties such as saponification value, acid number and iodine number of the EGEO were examined. The oil extracted has been analyzed to have 1.4602 - 1.4623 refractive index value, 0.918 - 0.919 specific gravity (sp.gr.), +9 - +10 optical rotation that satisfy the standards stipulated by European Pharmacopeia. All the physical and chemical parameters were in the range indicated by the ISO standards. Our findings will help to access the quality of the Eucalyptus oil which is important in the production of high value essential oils that will help to improve the economic condition of the community as well as the nation.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 17, 3; 303-315
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 71

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