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    Wyświetlanie 1-7 z 7
    Tytuł:
    Phytochemical potential of Ficus species for the control of the phytonematode Meloidogyne javanica
    Autorzy:
    Alves, J.R.
    De Assis, J.N.
    Padua, C.C.A.
    Balbino, H.M.
    Lima, L.L.
    De Souza Gouveia, A.
    Vital, C.E.
    Buonicontro, D.S.
    De Freitas, L.G.
    Leite, J.P.V.
    De Oliveira Ramos, H.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082765.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas chromatography/mass spectrometry (GC/MS)
    metabolite profiling
    pest
    control
    phytochemistry
    Opis:
    Root-knot nematodes, genus Meloidogyne, are among the most plant damaging pathogens worldwide. The action of natural products against plant pathogens has been investigated to assess their effectiveness in the control of diseases. Thus, the present study aimed to evaluate the phytochemistry potential of the Ficus species for the control of Meloidogyne javanica. In vitro inhibitory activity assays were performed with crude ethanolic extracts of leaves and branches from 10 Ficus species. Among these, Ficus carica extracts exhibited strong paralysis activity against second stage juveniles (J2) (EC50 = 134.90 μg ∙ ml–1 ), after 72 hours. In addition, high efficacy was observed in egg-hatching inhibition at different embryonic stages. Microscopy analysis revealed severe morphological alterations in the nematode tissues at the J2 stage, as well as immotility of juveniles released from eggs in the presence of F. carica extracts. The efficacy of the treatments for the other species was very low. These differences were supported by the variation in the compound classes, mainly for alkaloids and metabolite profiles by Gas Chromatography/Mass Spectrometry (GC/MS) when F. carica was compared with the other species. The results indicated that F. carica is a promising source for the isolation and identification of molecules capable of acting in the control of M. javanica.
    Źródło:
    Journal of Plant Protection Research; 2020, 60, 2; 193-206
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metodyka rozdzielania i oznaczania lotnych inhibitorów fermentacji w brzeczkach fermentacyjnych ciemnej fermentacji, techniką GC-MS
    Method for the separation and determination of volatile fermentation inhibitors in broths from dark fermentation, using GC-MS
    Autorzy:
    Makoś, P.
    Słupek, E.
    Kamiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/92212.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
    Tematy:
    biomasa lignocelulozowa
    fermentacja ciemna
    inhibitory fermentacji
    ekstrakcja ciecz-ciecz
    chromatografia gazowa
    spektrometria mas
    GC-MS
    fermentation inhibitors
    lignocellulosic biomass
    dark fermentation
    liquid-liquid extraction
    gas chromatography-mass spectrometry (GC-MS)
    Opis:
    W pracy przedstawiono opracowaną w wyniku badań metodykę identyfikacji i oznaczania inhibitorów fermentacji w brzeczkach fermentacji ciemnej z biomasy ligno-celulozowej, z wykorzystaniem ekstrakcji ciecz-ciecz w sprzężeniu z chromatografią gazową ze spektrometrem mas (LLE-GC-MS). W ramach badań dokonano doboru korzystnych warunków ekstrakcji ciecz-ciecz, w tym: pH, objętości rozpuszczalnika ekstrakcyjnego, czasu ekstrakcji oraz warunków wirowania. Opracowana metodyka charakteryzuje się niskimi wartościami granicy wykrywalności (0,0086 – 3,75 mg/L) i oznaczalności, dobrą powtarzalnością i szerokim zakresem liniowości. W próbkach brzeczek fermentacyjnych, zidentyfikowano trzy inhibitory fermentacji (furfural, gwajakol i syringol) w stężeniach w zakresie od 0,04 do 2,45 mg/L. Dodatkowo, osiem innych inhibitorów, w tym głównie lotne kwasy tłuszczowe w stężeniach od 2,86 do 956 mg/L zidentyfikowano w brzeczkach, w trybie SCAN. Wyniki badań, wskazują na konieczność monitorowania przebiegu procesu fermentacji ciemnej w zakresie powstawania inhibitorów fermentacji, których obecność wpływa toksycznie na mikroorganizmy wytwarzające biowodór.
    The paper presents the method for the qualitative and quantitative determination of fermentation inhibitors in fermentation broths for bio-hydrogen, using liquid-liquid extraction and gas chromatography with mass spectrometry (LLE-GC-MS). Initially, the extraction parameters were optimized. These included: pH, volume of extraction solvent, pH, extraction time as well as speed of centrifugation. The developed method has low detection limits (0,0086 – 3,75 mg/L), and determination, good repeatability and a wide range of linearity. In fermentation broth samples, three fermentation inhibitors (furfural, guaiacol and syringol) were identified in concentrations ranging from 0.04 to 2.45 mg/L. In addition, eight more inhibitors, mainly volatile fatty acids in concentrations from 2.86 to 956 mg/L, were identified in fermentation broth, using the SCAN mode. The paper demonstrates the need for monitoring inhibitors in fermentation broth during dark fermentation process, due to the fermentation inhibitors are toxic to biohydrogen-producing microorganisms.
    Źródło:
    Camera Separatoria; 2018, 10, 2; 64-80
    2083-6392
    2299-6265
    Pojawia się w:
    Camera Separatoria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Essential oil composition of different coriander (Coriandrum sativum L.) accessions and their influence on mycelial growth of Colletotrichum spp.
    Sklad olejkow eterycznych kolendry (Coriandrum sativum L.) i ich wplyw na wzrost grzybni Colletotrichum spp.
    Autorzy:
    Aćimović, M.G.
    Grahovac, M.S.
    Stanković, J.M.
    Cvetković, M.T.
    Maširević, S.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/11543291.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    essential oil
    coriander
    Coriandrum sativum
    mycelium growth
    Colletotrichum
    Colletotrichum acutatum
    Colletotrichum gloeosporioides
    antifungal activity
    gas chromatography-mass spectrometry
    GC-MS zob.gas chromatography-mass spectrometry
    Opis:
    Six coriander accessions of different origins were grown on an experimental field in Mošorin, Serbia during 2014. The GC/MS analysis of the essential oil showed that the major components in all samples were linalool (69.3–72.0%), γ-terpinene (6.0–9.6%) and α-pinene (6.7–8.2%), while other compounds were present at less than 5%. Antifungal activity of coriander oils against two phytopathogenic fungi from Colletotrichum genus (C. acutatum and C. gloeosporioides) was evaluated using the inverted petriplate method. Experiments show that coriander essential oil has antifungal properties against the apple bitter rot pathogens from Colletotrichum genus, but only at higher application rates (≥ 0.16 μl/ml of air). According to the obtained data, it can be concluded that tested coriander accessions differ in essential oil content and composition, as well as in influence on mycelial growth. Coriander essential oil has potential for being applied as a biological control agent against these two fungi from Colletotrichum genus.
    Sześć populacji kolendry różnego pochodzenia uprawiano na polu doświadczalnym w Mošorin w Serbii w 2014 roku. Analiza GC/MS olejku lotnego wykazała, że głównymi składnikami we wszystkich próbkach były linalol (69,3–72,0%), γ-terpinen (6,0–9,6%) oraz α-pinen (6,7–8,2%), natomiast inne składniki były obecne w ilości mniejszej niż 5%. Przeciwgrzybicze działanie olejków kolendry względem dwóch grzybów fitopatogenicznych z gatunku Colletotrichum (C. acutatum i C. gloeosporioides) oceniono za pomocą metody odwróconych szalek Petriego. Doświadczenia wykazały, że olejek eteryczny kolendry ma właściwości antygrzybicze względem patogenów gorzkiej zgnilizny jabłoni pochodzących z gatunku Colletotrichum, ale tylko przy większych dawkach aplikacji (≥ 0,16 μl/ml powietrza). Na podstawie uzyskanych danych można wyciągnąć wniosek, że badane populacje kolendry różnią się zawartością olejku eterycznego oraz wpływem na wzrost grzybni. Olejek eteryczny kolendry posiada potencjał jako środek ograniczający dwa grzyby z gatunku Colletotrichum.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2016, 15, 4; 35-44
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of distillation time and distillation apparatus on the chemical composition and quality of Lavandula angustifolia Mill. essential oil
    Autorzy:
    Wesołowska, Aneta
    Jadczak, Dorota
    Zyburtowicz, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/27315651.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Lavandula angustifolia essential oil
    distillation time
    distillation apparatus
    GC-MS
    gas chromatography-mass spectrometry
    quality of lavender essential oil
    Opis:
    In the study, the influence of distillation time as well as distillation apparatus on the chemical composition and quality of lavender (Lavandula angustifolia Mill.) essential oil were investigated. Two different types of distillation apparatuses: Deryng (popular in Poland) and Clevenger-type (recommended by European Pharmacopoeia) were used for the isolation of the essential oil from dried lavender flowers (Lavandulae flos). Moreover, different distillation times (2, 3 and 4 hours) were also applied. The chemical composition of the isolated oils, determined by gas chromatography coupled with mass spectrometry (GC-MS), revealed the dominance of linalool (11.55–17.19%) and linalyl acetate (12.84–16.78%) in the all analyzed samples. Other important constituents were: caryophyllene oxide (5.66–7.35%), lavandulyl acetate (4.64–5.40%) and borneol (4.62–5.51%). On the basis of the obtained data it was proved that the distillation time and distillation apparatus affect the amounts of some constituents in the lavender oil.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 4; 36--43
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    GC-MS Analysis of n-hexane extracts of Marine Seagrass Posidonia oceanica leaves, rhizomes and roots Collected from Benghazi beach Libya
    Autorzy:
    Elabbar, Fakhri
    Alasply, Abdulsalam
    Powiązania:
    https://bibliotekanauki.pl/articles/35507523.pdf
    Data publikacji:
    2024
    Wydawca:
    Radomskie Towarzystwo Naukowe
    Tematy:
    Posidonia oceanica
    seagrass
    phytochemistry
    GC-MS
    gas chromatography coupled with mass spectrometry
    Libya
    trawa morska
    fitochemia
    chromatografia gazowa sprzężona ze spektrometrią mas
    Libia
    Opis:
    Posidonia oceanica seagrass is endemic to the Mediterranean, and has very little information about volatile organic compounds. The plant was collected from Garyounis Beach in Benghazi, east of Libya, in September 2019. Plant parts, leaves, rhizomes, and roots were extracted using a Soxhlet extractor with Hexane. The compounds were characterized by gas chromatography-mass spectrometry. the extract's chemical constituents were de-convoluted using AMDIS software (www.amdis.net), and the mass spectra of the compounds spectra were explained by fragmentation pattern and matched to authentic standard spectra from Wiley and the NSIT Library database. The results revealed sixteen compounds, dominated by nine long-chain hydrocarbons, three long-chain fatty acids, and a single long-chain ketone. This is the first discovery of 3-ethyl-5-(2ethyl-butyl-octadecane, 6,10,14-trimethylpentadecan-2-one, phytol, and phytyl acetate from this plant.
    Źródło:
    Scientiae Radices; 2024, 3, 1; 1-8
    2956-4808
    Pojawia się w:
    Scientiae Radices
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composition, antioxidant and antimicrobial activities of cold-pressed and distilled essential oils of Origanum onites L. and Lavandula officinalis L. relationships evaluated by SEM microscopy
    Autorzy:
    Erturk, O.
    Aydin, G.
    Ayvaz, M.C.
    Baskan, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049191.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    Origanum onites
    Lavandula angustifolia
    essential oil
    antioxidant activity
    antimicrobial activity
    morphological change
    scanning electron microscopy
    chemical component
    gas chromatography-mass spectrometry
    oregano
    lawenda
    olejek eteryczny
    działanie antyoksydacyjne
    analiza GC-MS
    działanie przeciwdrobnoustrojowe
    Opis:
    Introduction: In order to prevent increased bacterial resistance, it is important to use herbal medicines with less side effects. Objective: In this study, the chemical composition, antimicrobial, antioxidant activities and SEM images of Lavandula officinalis and Origanum onites oils obtained in two different ways were determined. Methods: The antimicrobial activity of the oils was determined against reference and multiple strains of foodborne and pathogenic bacteria. The each essential oil sample were analyzed by GC–MS. Antioxidant activities of the samples were examined through DPPH• and ABTS•+ radical scavenging and FRAP assays. Results: The results indicate that the oils of obtained from Origanum onites and Lavandula officinalis exhibited relatively strong antibacterial and antifungal activity. In addition, the antioxidant activities detected were remarkable. Morphological changes in bacterial cells treated with essential oil samples were demonstrated with SEM images. In addition, the chemical components of the oil samples obtained by both water steam and cold press were revealed by GC-MS analysis and compared. Conclusion: When all the obtained results are evaluated together; these plants could be suitable for using as antimicrobial and antioxidative agents in several industries such as food, cosmetic, etc.
    Źródło:
    Herba Polonica; 2020, 66, 4; 43-54
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrocarbon species in SI and HCCI engine using winter grade commercial gasoline
    Autorzy:
    Elghawi, Usama
    Mayouf, Ahmed
    Tsolakis, Athanasios
    Powiązania:
    https://bibliotekanauki.pl/articles/2097456.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    homogeneous charge compression ignition
    HCCI
    gas chromatography-mass spectrometry
    GC-MS
    hydrocarbon speciation
    regulated emissions
    unregulated emissions
    zapłon samoczynny mieszanki jednorodnej
    chromatografia gazowa ze spektrometrią mas
    specjacja węglowodoru
    emisje regulowane
    emisje nieregulowane
    Opis:
    The study provides a qualitative and quantitative analysis of the C5-C11 hydrocarbon species generated in Spark Ignition - Homogeneous Charge Compression Ignition (SI/HCCI) gasoline direct injection (GDI) engine at range of operating conditions. The presented results and data were obtained from the combustion of winter grade commercial gasoline containing 2% w/w ethanol (C2H5OH) for the engine operated in steady-state, fully warmed-up condition. The hydrocarbon analysis in exhaust gases was executed on a Gas Chromatography-Mass Spectrometer (GC-MS) apparatus directly connected to the engine exhaust via heated line. The highest concentration of the total hydrocarbon emissions was obtained under low load HCCI engine operation at stoichiometric fuel-air ratio. The major hydrocarbon compounds detected in the collected samples were benzene, toluene, p-xylene, and naphthalene. Benzene originates from the incomplete combustion of toluene and other alkylbenzenes which are of considerable environmental interest. During the SI engine operation, increase of the engine speed and load resulted in the increase of benzene and the total olefinic species with simultaneous decrease in isopentane and isooctane. The same trends are seen with the engine operating under HCCI mode, but since the combustion temperature is always lower than SI mode under the same engine conditions, the oxidation of fuel paraffin in the former case was less. As a result, the total olefins and benzene levels in HCCI mode were lower than the corresponding amount observed in SI mode. Aromatic compounds (e.g., toluene), except for benzene, were produced at lower levels in the exhaust when the engine speed and load for both modes were increased.
    Źródło:
    Combustion Engines; 2020, 59, 1; 17--24
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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