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Tytuł:
Gas chromatography mass spectrum and Fourier transform - infrared spectroscopy analysis of methanolic extract of Cressa cretica L. leaves
Autorzy:
Omran, Aseel Muhammed
Abu-seraj, Nidaa Adnan
Al Husaini, Ibtihal Muiz
Powiązania:
https://bibliotekanauki.pl/articles/1182951.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ft-ir
gc-ms analysis
leaves
methanol
cressa cretica
Opis:
Aims of this study were to investigation the presence of phytochemical compounds in the methanolic extract of Cressa cretica L. leaves by using GC-MS method and report the functional groups by using FT-IR spectroscopy. The identification of phytochemical compounds based on the peak area, retention time, molecular weight, molecular formula, MS fragment ions. Thirty four phytochemical compounds were identification in the methanolic extract of Cressa cretica leaves. The GC-MS analysis provide the existence of 5-Methyl-6-phenyltetrahydro-1,3-oxazine-2-thione, Lactose, 3-Deoxy-L-ribose-2,5-dibenzoate, Sarreroside, Pterin-6-carboxylic acid, Octadecadiynoic acid, methyl ester, d-Mannose, Dodecanoic acid, 3-hydroxy-, Geranyl isovalerate, Tetradecanoic acid , 6-epi-shyobunol, Paromomycin, Cis-9-Hexadecenoic acid, and others. The FT-IR analysis revealed the presence of Alkenes, aliphatic amines, nitro compounds, alkanes. These are chemical compounds are may be useful for various herbal formulation as antifungal, antibacterial, anti- inflammatory, anti-oxidant and others.
Źródło:
World Scientific News; 2016, 49, 2; 381-404
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diesel hydrocarbons biodegradation by Myroide odoratimimus
Autorzy:
Divya, U. K.
Saranya, A.
Suganthi, R.
Powiązania:
https://bibliotekanauki.pl/articles/1109628.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Biodegradation
Diesel
Diesel hydrocarbon
GC-MS analysis
Myroide odoratimimus
Soil
Opis:
Biodegradation can be a possible and effective retort to soil contamination by petroleum hydrocarbons. Nowadays there are many cases of accidental releases of petroleum products into the environment. Use of biological agents especially microorganism is effective in degradation of complex organic contaminants to other simpler organic compounds. In our present study role of Myroide odoratimimus in degrading the diesel components present in soil to simpler units were checked. The study demonstrates that Myroides odoratimimus (SKS 05) showed the ability to degrade diesel after 40 days of incubation in the diesel adsorbed soil with a growth rate of 6.2×106 CFU/ml and from the GC study Myroides odoratimimus degraded the component Dotriacontane (25.471), Hexatriacontane (27.98), Tetracosane (30.296), Pentatriacontane (32.42), Tetrapentacontane (34.39) present in the diesel adsorbed soil, which was confirmed by the reduction in the peak height and the peak area in comparison to the control {without Myroides odoratimimus (SKS 05).
Źródło:
World News of Natural Sciences; 2018, 20; 182-195
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of phytochemical constituents of Methanol extract of Moringa oleifera Lam. whole leaf by Gas Chromatography-Mass Spectrometry and Fourier transform infrared spectroscopy analysis
Autorzy:
Okechukwu, Victor Uchechukwu
Eze, Sunday Onyekwere
Omokpariola, Daniel Omeodisemi
Okereke, Janefrancess Chinemerem
Powiązania:
https://bibliotekanauki.pl/articles/1031420.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
FT-IR analysis
GC-MS analysis
Moringa oleifera
methanol extract
phytochemical constituents
Opis:
The research study evaluated the phytochemical constituents of Methanol extracts of Moringa oleifera whole leaf by Gas Chromatography-Mass Spectrometry (GC-MS) and Fourier transform infrared spectroscopy (FT/IR) analysis. The leaves was washed, air dried for 2 weeks, then ground into a fine powder and extracted using methanol by maceration for 24 hours using standard procedures. After the contact time elapsed, the solvent filtered to recover the extract. The functional groups and the chemical constituents of the methanol extract of Moringa oleifera leaves investigated using Fourier transform infrared spectroscopy (FT/IR) and Gas Chromatography-Mass Spectrometry (GC-MS) respectively. The FT/IR analysis confirmed the presence of O-H, C=C, C-H, C-O, CH3 and C=C-H bond stretching functional groups, which indicates that the substance is an aliphatic alcohol, ester, aldehyde and carboxylic acid. However, the fingerprint region had a pattern that is specific for every molecule, the presence of -OH function and N-O stretch; suggest that or alcohols and nitrogen or aromatic or aliphatic phenols containing molecules are major components of the Moringa oleifera leaf studied. GC-MS analysis of the extract reveals the identification of twenty compounds, in which two compounds were identified in each peak. N,N'-Pentamethylenebis[s-3-aminopropyl thiosulfuric acid and 2-Myristynoyl pantetheine (100%), 2-Myristynoyl pantetheine and Deoxyspergualin (92.05%), 5-Octadecenal and 9-Hexadecenoic acid (27.94%). N,N'-Pentamethylenebis[s-3-aminopropyl thiosulfuric acid and Pentetic Acid are the major phytoconstituents. Most of the compounds in the list are bioactive and possess medicinal properties, which further justify the application of Moringa oleifera traditional plant in the discovery of novel therapeutics.
Źródło:
World News of Natural Sciences; 2021, 37; 18-30
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FROM HARVESTING TO DISTILLATION – EFFECT OF ANALYTICAL PROCEDURES ON THE YIELD AND CHEMICAL COMPOSITION OF RHODODENDRON TOMENTOSUM (LEDUM PALUSTRE) ESSENTIAL OIL
Autorzy:
Łuczkiewicz, Maria
Jesionek, Anna
Zabiegala, Bozena
Bucinski, Adam
Powiązania:
https://bibliotekanauki.pl/articles/895545.pdf
Data publikacji:
2019-02-28
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
drying
GC/MS analysis
Likens-Nickerson apparatus
Clevenger apparatus
Deryng apparatus
distillation
Opis:
Abstract: Rhododendron tomentosum possesses the anti-inflammatory, analgesic and antimicrobial properties, determined by the chemical composition of its essential oil. The effects of place (Miszewko, Lubichowo) and time of harvesting (June, November) as well as drying (air-drying, oven-drying, freeze-drying) and isolation (in Deryng, Clevenger and Likens-Nickerson apparatus) procedures on the yield and quality of R. tomentosum essential oil were studied. Ledol (8.1-14.4%), palustrol (6.9-13.0%) and γ-terpineol (8.5-9.1%) predominated in the plants collected from Miszewko, while γ-terpineol (11.8-22.2%), p-cymene (5.3-12.6%) and geranyl acetate (5.7-7.5%) prevailed in the biomass from Lubichowo. The shoots produced more volatiles in the flowering phase than in the end of the vegetation. Oven-drying at 30ºC with controlled air flow was suggested as the quick dehydration method. Hydrodistillation in Deryng and Clevenger apparatus resulted in comparatively high essential oil yield (about 1%). All studied drying and distillation methods did not influence significantly the general profile of R. tomentosum essential oil.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 1; 83-92
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of phytochemical composition and in vitro antioxidant potential of Cyathea latebrosa leaves
Autorzy:
Ikpa, Chinyere B. C.
Maduka, Tochukwu D. O.
Ikpa, Chinomnso Uzoamaka
Powiązania:
https://bibliotekanauki.pl/articles/1193436.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Characterization
Cyathea latebrosa
GC/MS analysis
Phytochemical
Treatment
antioxidant
in vitro
phytochemical composition
Opis:
Phytochemicals and antioxidant potentials of chloroform extract of leaves of Cyathea latebrosa have been investigated. The metabolites detected are Carbohydrates, starch, glycosides, saponins, alkaloids, tannins, flavonoids, sterols, terpenes, and polyuronides. Quantitative Phytochemical analysis gave alkaloid (0.08×102 ±0.02), saponins (0.16×102 ±0.02), tannin (0.11×102 ±0.01), flavonoid (0.16×102 ±0.01), and phenol (0.18×102 ±0.01). FT-IR (KBr) cm-1 analysis showed -NH-(3433.41 weak), -OH- (3851.01 sharp), -C-F (1408.8 strong) –SO-(1101.39) and Ar (1646.3 weak), GC/MS characterization revealed the extract contained [2-Aziridinylethyl]amine (70.7%), Benzeneethamine, 3-fluoro-β,5-dihydroxy-N-methyl (14.0%), N-Methyltaurine (10.7%) and (R)-(-)-2-Amino-1-propanol (3.15%). The presence of these compounds exposed the leaves as a potential remedy for alleviated cold, cancer, malaria and to regulate immune functions. At 400 µg/ml concentration the extract and ascorbic acid produced 54.34% and 96.02% antioxidant activity respectively. The FRAP values were significantly (p < 0.05) low than the value of ascorbic acid (2µ M). The plant extracts showed low antioxidant potential even on higher concentrations when compared to reference standard ascorbic acid.
Źródło:
World Scientific News; 2021, 157; 25-37
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytochemical analysis, antioxidant and anticancer activity of Aerva javanica growing in district Karak, Khyber Pakhtunkhwa Pakistan
Autorzy:
Afzal, Sajida
Khan, Siraj
Iqbal, Majid
Akhtar, Anam
Powiązania:
https://bibliotekanauki.pl/articles/2087348.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
phytochemistry
antioxidant potential
anticancer potential
GC-MS analysis
Aerva javanica
fitochemia
potencjał antyoksydacyjny
potencjał przeciwnowotworowy
analiza GC-MS
Opis:
The purpose of this study was to evaluate the photochemical, antioxidants and anticancer activity of the medicinal plant Aerva javanica. This plant belongs to the Amaranthaceae family. Locally it is called “bui”. It is a shrub with a long tap root that grows all over India in the wild. The plant extracts were prepared using ethanol, methanol and distilled water as solvents. The antioxidant activity was determined using DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) free radical scavenging activity and IC50 was determined. The total flavonoids compounds found in Aerva javanica ethanolic extract were (0.90 ±0.16) while the total phenolic contents found in ethanolic extract were (0.78 ±0.16), followed by the methanolic and aqueous extract. The antioxidant results of methanolic extract of Aerva javanica showed 0.78 ±0.18 percent inhibition and SCV 49.10% at concentration of 1.5 mg/ml, ethanolic extract showed 0.54 ±0.12 percent inhibition with 64.28% SCV. Phytochemical analysis of best result oriented Aerva javanica extract was done with Gas Chromatography-Mass Spectrometry (GC-MS) technique. The results revealed the presence of different compounds predominantly Acetone (1.18%), Ethyl Acetate (38.95%), (20.77%), n-Propyl acetate (4.09%), Isobutyl acetate (2.71%), (3.84%), isoquinoline,1-[(3,4-diethoxyphenyl)methyl]-6,7-diethoxy- (3.36%), Cyclohexanone (1.43%), 1,1-Diisobutoxy-isobutane (2.02%), n-Hexadecanoic acid (5.61%), Phytol (3.57%), 9-Octadecenoic acid, 1,2,3-propanetriyl ester (10.72%), Octadecanoic acid (1.78%), Bis(2-ethylhexyl) phthalate (3.48%), Squalene (1.40%), 2,2-Dimethyl-3-(3,7,16,20-tetramethyl (1.12%) and 1,6,10,14,18,22-Tetracosahexaen-3-ol (1.195%). The study concludes that extensive research is required to detect more novel compounds in order to develop effective management approaches that significantly reduce the impact of the pathogens on human health as well as on environment.
Celem pracy była ocena fotochemicznej, antyoksydacyjnej i przeciwnowotworowej aktywności rośliny leczniczej Aerva javanica. Ta roślina należy do rodziny Amaranthaceae. Lokalnie nazywa się „bui”. Jest to krzew o długim korzeniu palowym, który dziko rośnie w całych Indiach. Ekstrakty roślinne przygotowano przy użyciu etanolu, metanolu i wody destylowanej jako rozpuszczalników. Aktywność przeciwutleniającą oznaczono za pomocą DPPH (2,2-difenylo-1-pikrylohydrazyl-hydrat) neutralizując wolne rodniki i wyznaczając IC50. Całkowita zawartość związków flawonoidowych znaleziona w ekstrakcie etanolowym Aerva javanica wynosiła (0,90 ±0,16), podczas gdy całkowita zawartość fenoli znaleziona w ekstrakcie etanolowym wynosiła (0,78 ±0,16), a następnie w ekstrakcie metanolowym i wodnym. Wyniki antyoksydacyjne ekstraktu metanolowego z Aerva javanica wykazały 0,78 ±0,18 procent inhibicji, a SCV 49,10% przy stężeniu 1,5 mg/ml, ekstrakt etanolowy wykazał 0,54 ±0,12 procent inhibicji z 64,28% SCV. Analizę fitochemiczną ekstraktu Aerva javanica przeprowadzono techniką chromatografii gazowej ze spektrometrią mas (GC-MS). Wyniki wykazały obecność różnych związków, głównie acetonu (1,18%), octanu etylu (38,95%), (20,77%), octanu n-propylu (4,09%), octanu izobutylu (2,71%), (3,84%), izochinoliny, 1-[(3,4-dietoksyfenylo) metylo]-6,7-dietoksy- (3,36%), cykloheksanon (1,43%), 1,1-diizobutoksy-izobutan (2,02%), kwas n-heksadekanowy (5,61%), fitol (3,57%), kwas 9-oktadecenowy, ester 1,2,3-propanotriylowy (10,72%), kwas oktadekanowy (1,78%), ftalan bis(2-etyloheksylu) (3,48%), skwalen (1,40%), 2,2-dimetylo-3-3,7,16,20-tetrametyl (1,12%) i 1,6,10,14,18,22-tetrakozaheksaen-3-ol (1,195%). Potrzebne są badania mające na celu wykrycie większej liczby nowych związków w celu opracowania skutecznych metod zarządzania, które znacznie zmniejszą wpływ patogenów na zdrowie człowieka, a także na środowisko.
Źródło:
Acta Biologica; 2021, 28; 91-107
2450-8330
2353-3013
Pojawia się w:
Acta Biologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Insecticidal activity and chemical composition of essential oil from Artemisia judaica L. against Callosobruchus maculatus (F.) (coleoptera: bruchidae)
Autorzy:
Abd-Elhady, H.K.
Powiązania:
https://bibliotekanauki.pl/articles/961654.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
essential oil
artemisia judaica
insecticidal activity
callosobruchus maculatus
chemical composition
gas chromatographymass spectrometry (gc/ms) analysis
Opis:
The insecticidal properties of essential oil derived via the hydro-distillation method from aerial parts of Artemisia judaica L. were tested against the cowpea weevil, Callosobruchus maculatus (Fab.) (Coleoptera: Bruchidae). The repellent activity assay of essential oil against C. maculates adults indicated that in concentrations of 63.7, 31.9, 15.9, 8.0 or 4.0 μg/cm2, the oil reduced egg laying by 92.5, 86.0, 61.8, 42.7 and 12.5%, respectively. Also, the residual-film assay showed that after 72 hours of treatment, concentrations of 50 and 40% were highly effective against the C. maculates adults. The sub-lethal effects of essential oil were investigated on fecundity and F1 progany by exposing adult females to treated seeds. Both LC25 and LC50 of essential oil significantly reduced F1 progany production compared to the control. The chemical composition of the essential oil was analyzed by GC-MS and the resulting oil piperitone (32.4%), camphor (20.6%) and (E)-ethyl cinnnamate (8.2%) were found to contain the major constituents of the oil. This provided the insecticidal properties of the essential oil against cowpea weevil.
Źródło:
Journal of Plant Protection Research; 2012, 52, 3
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical profile and antibacterial activity of essential oils from leaves and fruits of Gaultheria procumbens L. cultivated in Poland
Autorzy:
Magiera, Anna
Sienkiewicz, Monika
Olszewska, Monika
Kicel, Agnieszka
Michel, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/895472.pdf
Data publikacji:
2019-02-28
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
essential oil
antibacterial activity
chemical composition
methyl salicylate
Gaultheria procumbens L
GC-FID/MS analysis
Opis:
Essential oils (EOs) of Gaultheria procumbens were obtained by hydrodistillation with the yield of 1.30% ± 0.05 (v/dw) for leaves and 2.68% ± 0.08 (v/dw) for fruits. The GC-FID/MS analysis led to the identification of 64 volatile components, among which 27 were found in leaf EO, 49 in fruit EO, and 59 analytes were detected for the first time in G. procumbens. Methyl salicylate, which is known as a potent anti-inflammatory agent, was the dominant component making up to 97.5% and 99.8% of the total fruit and leaf EOs, respectively. The remaining volatiles of the leaves included mainly monoterpenes (α-pinene, β-pinene, limonene), methyl-o-anisate, massoilactone, spiro[4,5]decane-1-one, and aliphatic alcohols (heptan-2-ol, octan-1-ol), while the fruit EO contained apart from the dominant aliphatic and aromatic alcohols (benzyl alcohol, heptan-2-ol, p-cymen-7-ol) also carboxylic acids (3-hydroxyphenylacetic acid, heptanoic acid, octanoic acid) and aldehydes (hexanal, furfural, pent-4-enal). The antibacterial activity of the EOs was evaluated using a microdilution broth method against twelve reference strains, as well as clinical and environmental isolates. Differences between activity parameters of both EOs were not statistically significant (p > 0.05) for most tested bacteria. On the other hand, both EOs were significantly more effective against Gram-negative (MIC, 8.2-10.0 mg/mL) than Gram-positive bacteria (MIC, 13.5-16.7 mg/mL). Leaves and especially fruits of G. procumbens cultivated in Poland were proved valuable sources of methyl salicylate-rich EOs of moderate antibacterial activity, which, therefore, could partly explain the traditional use of the plant materials and the EOs in the treatment of bacterial infections-related inflammatory disorders.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 1; 93-102
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic analysis of phytochemical compounds in Garcina kola leaf extract
Autorzy:
Anadebe, V. C.
Okafor, N. A.
Okafor, B. O.
Emmanuel, C. C.
Powiązania:
https://bibliotekanauki.pl/articles/1113583.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
FTIR Analysis
GC-MS
Garcina kola leaf
Phytochemical Analysis
Opis:
Garcina kola leaves were collected, washed, dried and powdered. The ethanol extracts were first prepared by the simple method of cold extraction. The extracts were then characterized by the Phytochemical analysis, Fourier transform infrared spectroscopy (FTIR) and Gas chromatography mass spectroscopy (GC-MS) to identify the fatty acids and heterocyclic compounds present in the leaf extracts. The FTIR analysis shows a variation of the peaks that indicate there is synergy among the functional groups of the extract. Moreover, the phytochemical analysis revealed the presence of alkaloids, flavonoids, phenol, saponins, tannins and steroids. The study reveals that the chemical constituents of Garcina kola leaf may be behind their medicinal values in phytomedicine.
Źródło:
World News of Natural Sciences; 2017, 15; 162-168
2543-5426
Pojawia się w:
World News of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the Harmfulness of Moulding Sands with Alkyd Resin Subjected to the High Temperature Influence
Autorzy:
Holtzer, M.
Dańko, R.
Żymankowska-Kumon, S.
Kubecki, M.
Bobrowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/354778.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
moulding sand
binding
BTEX
thermal analysis
GC/MS
Opis:
Out of moulding sands used in the foundry industry, sands with organic binders deserve a special attention. These binders are based on synthetic resins, which ensure obtaining the proper technological properties and sound castings, however, they negatively influence the environment. These resins in their initial state these resins are not very dangerous for people and for the environment, thus under an influence of high temperatures they generate very harmful products, being the result of their thermal decomposition. Depending on the kind of the applied resin, under an influence of a temperature such compounds as: furfuryl alcohol, formaldehyde, phenol, BTEX group (benzene, toluene, ethylbenzene, xylene), and also polycyclic aromatic hydrocarbons (PAHs) can be formed and released. The aim of the study was the development of the method, selection of analytical methods and the determination of optimal conditions of formation compounds from the BTEX and PAHs group. Investigations were carried out in the specially designed set up for the thermal decomposition of organic substances in a temperature range: 500 – 1 300°C at the laboratory scale. The object for testing was alkyd resin applied as a binding material for moulding sands. The qualitative and quantitative analyses of compounds were performed by means of the gas chromatography coupled with the mass spectrometry (GC/MS).
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 2171-2176
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparing the application of GC/FID and GC/MS methods in the quantitative analysis of 3-nitrotoluene in an excess of 2- and 4-nitrotoluene in products of toluene nitration
Porównanie zastosowania metod GC/FID oraz GC/MS w oznaczaniu zawartości 3-nitrotoluenu w produktach nitrowania toluenu wobec nadmiaru 2- i 4-nitrotoluenu
Autorzy:
Tomaszewski, Waldemar
Czernik, Klaudia
Maksimowski, Paweł
Nastała, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/27787691.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
nitrotoluenes
GC-FID method
GC-MS method
quantitative analysis
limit of detection
limit of quantification
nitrotolueny
metoda GC-FID
metoda GC-MS
analiza ilościowa
granica wykrywalności
granica oznaczalności
Opis:
Comparison of gas chromatographic methods GC/FID and GC/MS for quantification of 3-nitrotoluene (3-NT) in the presence of high concentrations of 2-nitrotoluene and 4-nitrotoluene, is presented. GC/FID linear regression allows calibration curves in the concentration range of mononitrotoluene (MNT) 0.5-10 mg/ml to be obtained. For GC/MS, a non-linear dependence of detector signal was observed, particular for higher MNTs concentrations. However, calibration data could be fitted stepwise with three separate calibration lines. Using regression parameters, detection and quantification limits of GC/FID and GC/MS methods were determined. Their values proved to be comparable for both methods. The experiments showed that determination of small concentrations of 3-NT in a large excess of the others is possible using both calibration curves and peak area i.e. in percentage terms.
Opracowano procedurę ilościowego oznaczania mononitrotoluenów (MNTs) wykorzystując metodę GC/FID oraz GC/MS. Dla GC/FID uzyskano krzywe kalibracyjne w zakresie stężeń MNT 0,5-10 mg/ml. Dla GC/MS nie dopasowano wszystkich punktów kalibracyjnych metodą regresji liniowej. Dane te dopasowano metodą regresji nieliniowej. Dla uproszczenia oznaczeń ilościowych dane dla GC/MS dopasowano metodą regresji liniowej przy pomocy trzech krzywych kalibracyjnych. Wykorzystując parametry regresyjne wyznaczono granice wykrywalności i granice oznaczalności obu metod. Wartości tych granic, po uwzględnieniu niepewności pomiarowych, uznano za jednakowe. Badania wykazały, że oznaczanie niewielkich zawartości 3-NT w obecności nadmiaru pozostałych MNTs, wymaga odpowiedniego doboru stężeń próbek. Wtedy 3-NT można oznaczyć przy pomocy krzywych kalibracyjnych, jak i na podstawie procentowego udziału pól powierzchni pików MNT.
Źródło:
Materiały Wysokoenergetyczne; 2021, 13; 101--111
2083-0165
Pojawia się w:
Materiały Wysokoenergetyczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the compounds from the BTEX group, emitted during thermal decomposition of alkyd resin
Autorzy:
Kubecki, M.
Holtzer, M.
Bobrowski, A.
Dańko, R.
Grabowska, B.
Żymankowska-Kumon, S.
Powiązania:
https://bibliotekanauki.pl/articles/380216.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
masa formierska
wiązanie
BTEX
analiza termiczna
GC-MS
moulding sand
binding
thermal analysis
Opis:
Suitability of the given binding agent for the moulding sands preparation depends on the one hand on the estimation of technological properties of the sand and the mould made of it and the obtained casting quality and on the other hand on the assessment of this sand influence on the natural and working environment. Out of moulding sands used in the foundry industry, sands with organic binders deserve a special attention. These binders are based on synthetic resins, which ensure obtaining the proper technological properties and sound castings, however, they negatively influence the environment. If in the initial state these resins are not very dangerous for people and for the environment, thus under an influence of high temperatures they generate very harmful products, being the result of their thermal decomposition. Depending on the kind of the applied resin (phenol-formaldehyde, urea, furfuryl, urea-furfuryl, alkyd) under an influence of a temperature such compounds as: furfuryl alcohol, formaldehyde, phenol, BTEX group (benzene, toluene, ethylbenzene, xylene), and also polycyclic aromatic hydrocarbons (PAH) can be formed and released. The aim of the study was the development of the method, selection of analytical methods and the determination of optimal conditions of formation compounds from the BTEX group. An emission of these components constitutes one of the basic criteria of the harmfulness assessment of binders applied for moulding and core sands. Investigations were carried out in the specially designed set up for the thermal decomposition of organic substances in a temperature range: 5000C - 13000C at the laboratory scale. The object for testing was alkyd resin applied as a binding material for moulding sands. Within investigations the minimal amount of adsorbent necessary for the adsorption of compounds released during the decomposition of the resin sample of a mass app. 15 mg was selected. Also the minimal amount of solvent needed for the desorption of compounds adsorbed in the column with adsorbent was found. The temperature range, in which the maximal amounts of benzene, toluene, ethylobenzene and xylenes are released from the resin, was defined. The qualitative and quantitative analyses of compounds from the BTEX group were performed by means of the gas chromatography combined with the mass spectrometry (GC/MS).
Źródło:
Archives of Foundry Engineering; 2012, 12, 3; 69-74
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Organic Compounds Released by Thermal Decomposition of Wood Composite
Związki organiczne uwalniane w czasie termicznego rozkładu kompozytów drzewnych
Autorzy:
Ruzickova, J.
Safar, M.
Raclavska, H.
Skrobankova, H.
Raclavsky, K.
Powiązania:
https://bibliotekanauki.pl/articles/319129.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
geochemia organiczna
biomasa
piroliza GC/MS
analiza termiczna (TG/DSC)
sklejka
płyty drewniane
organic geochemistry
biomass
pyrolysis-GC/MS
thermal analysis TG/DSC
plywood
chipboard
Opis:
Combustion of biomass materials based on wood combined with synthetic polymers was studied. Material types included plywood and wood chipboard. Wood chips prepared from hardwood – beech and softwood – spruce were used for comparison. Combustion process was characterized by thermal analysis – thermogravimetry and differential scanning calorimetry. Pyrolysis gas chromatography with mass spectrometric detection was used for determination of organic compounds and their fragments formed during thermal decomposition. Attention was paid to organic compounds contained in wood-polymer composites.
Zbadano spalanie materiałów biomasowych na bazie drewna w połączeniu z syntetycznymi polimerami. Materiały zawierały sklejkę i drewniane płyty wiórowe. Do porównania użyto zrębków z drewna liściastego - drewna bukowego i miękkiego - świerka. Proces spalania scharakteryzowano prowadząc analizą termiczną - termograwimetrią i różnicową kalorymetrię skaningową. Do oznaczenia zawartości związków organicznych i ich pochodnych powstałych w trakcie procesu użyto pirolitycznej chromatografii gazowej z detekcją spektrometryczną. Zwrócono uwagę na związki organiczne zawarte w kompozytach drewno-polimer.
Źródło:
Inżynieria Mineralna; 2018, R. 19, nr 1, 1; 87-92
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
TG-DTG-DSC, FTIR, DRIFT, and Py-GC-MS Studies of Thermal Decomposition for Poly(sodium acrylate)/Dextrin (PAANa/D) – New Binder BioCo3
Autorzy:
Grabowska, B.
Kaczmarska, K.
Bobrowski, A.
Żymankowska-Kumon, S.
Kurleto-Kozioł, Ż.
Powiązania:
https://bibliotekanauki.pl/articles/106999.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
polymer binders
foundry sands
thermal analysis
TG-DTG-DSC
FTIR
Py-GC-MS
thermal degradation
Opis:
TG-DTG-DSC, FTIR, DRIFT, and Py-GC-MS studies have been conducted to determine the effect of the thermal decomposition conditions and structure of foundry binder BioCo3 in the form of a composition poly(sodium acrylate)/dextrin (PAANa/D) on the progress of degradation in terms of processes occurring in foundry sands in contact with liquid metal. TG-DTG-DSC curves of the composition allowed us to determine the temperature range in which they do not undergo degradation, by which they do not lose their binding properties. With temperature increasing, physical and chemical changes occur that are related to the evaporation of solvent water (20–110°C), followed by the release of constitution water, and finally intermolecular dehydration (110–230°C). In this temperature range, processes that are mainly reversible take place. Within a temperature range of 450–826°C, polymer chains are decomposed, including the decomposition of side chains. Within a temperature range of 399–663°C, polymer composition decomposition can be observed (FTIR, DRIFT), and gas products are generated from this destruction (Py-GC-MS).
Źródło:
Journal of Casting & Materials Engineering; 2017, 1, 1; 27-32
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and Validation of a GC-MS Method for the Simultaneous Quantitation of Zearalenone and Its Metabolites in Water
Opracowanie i walidacja metody GC-MS do równoczesnego oznaczania zearalenonu i jego metabolitów w wodzie
Autorzy:
Dudziak, M.
Powiązania:
https://bibliotekanauki.pl/articles/388081.pdf
Data publikacji:
2010
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
zearalenon
metabolity
mykoestrogeny
SPE
GC-MS
oznaczanie
analiza wody
zearalenone
metabolites
mycoestrogens
determination
water analysis
Opis:
The method of simultaneous determination of zearalenone and its metabolites in water with use of GC-MS chromatography was evaluated. The solid phase extraction SPE was used for analytes separation from water and as an enrichment method. The influence of compounds concentration and water sample volume on analytes recovery was investigated. The chromatographic analysis was preceded by conversion of compounds to trimethylsilyl ethers derivatives. The developed SPE-derivatization-GC/MS method allow to separate quaternary mixture of mycoestrogens with the quantitative analysis in water, when their concentration is greater than 0.2–0.5 ng/dm3. The repeatability of the results was from 1 to 8 %. The recovery of compounds exceeded 60 % for samples contains from 50 to 200 ng/dm3 of mycotoxins. The concentration of analytes and volume of the sample (100–500 cm3) did not have an influence on the extraction output. The developed method can be applied to analyze water samples containing mycoestrogens at the level of ng/dm3.
Ocenie poddano metodę równoczesnego oznaczania zearalenonu i jego metabolitów w wodzie z użyciem chromatografii GC-MS. Ekstrakcja do fazy stałej SPE wykorzystana została jako metoda wydzielania i wzbogacania analitów z wody. Badano wpływ stężenia i objętości próbki wody na odzysk związków. Z kolei przed chromatograficznym oznaczeniem mykoestrogeny przeprowadzono w etery trimetylosiliowe. Metoda SPE-derywatyzacja-GC/MS umożliwia rozdział czteroskładnikowej mieszaniny mykoestrogenów i ich ilościowe oznaczenie w wodzie na poziomie stężeń 0,2–0,5 ng/dm3. Powtarzalność oznaczeń była w zakresie 1–8 %. Wyznaczony odzysk związków dla stężenia w zakresie 50–200 ng/dm3 przekraczał 60 %. Nie obserwowano znacznego wpływu stężenia analitów jak i objętości próbki wody (100–500 cm3) na wydajność ekstrakcji. Przedstawioną metodykę można więc zastosować do kontroli analitycznej obecności mykoestrogenów w środowisku wodnym na poziome stężeń ng/dm3.
Źródło:
Ecological Chemistry and Engineering. A; 2010, 17, 11; 1397-1404
1898-6188
2084-4530
Pojawia się w:
Ecological Chemistry and Engineering. A
Dostawca treści:
Biblioteka Nauki
Artykuł
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