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1

Optimization of SPME-GC-MS analysis of chlorophenoxy herbicides

100%
Krzyzanowski R., Leszczynski B.
Herba Polonica
|
2004
|
tom 50
|
nr 3-4
Application of solid phase microextraction (SPMŁi) and gas chromatography combined with mass spectrometry (GC-MS) for analysis of the chlorophenoxy herbicide residues was studied. The optimal conditions for SPME/GC-MS analysis of chlorophenoxy herbicides were determined as follows: adsorption time 15-20 min at 50°C and desorption time 6 min at 220°C. The highest concentration of MCPA was found in the tissues of the weeds of M. inodora, C. bursa pastoris, while the lowest in A. githago, P. aviculare. In addition to that, in May and June the studied herbicides were found in low quantities in the surface waters of the river of Liwiec.
2
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Analysis of the ability to form 2-phenylethyl alcohol by Galactomyces geotrichum MK017

86%
Grygier M., Majcher M., Myszka K.
Żywność Nauka Technologia Jakość
|
2015
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tom 22
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nr 3
The aim of the study was to evaluate the ability of Galactomyces geotrichum MK017 for the biosynthesis of 2-phenylethyl alcohol and optimization of the culture medium composition in order to increase the yield of the product. The culture of Galactomyces geotrichum MK017 strain was carried out in the laboratory scale. For isolation of volatiles Solid Phase Microextraction (SPME) has been used. The identification and quantification of aroma compounds produced by examined microflora was determined by gas chromatography and mass spectrometry (GC/MS) system. The results showed that the tested mould Galactomyces geotrichum MK017 shows the potential for the production of 2-phenylethyl alcohol, but also for the synthesis of phenylacetaldehyde, phenylacetic and phenyllactic acids. For the optimization of the 2-phenylethyl alcohol production yield four different medium composition have been tested. The bioprocess of aroma compound production by tested microorganism was the most efficient on the medium composed of sucrose (80 g/l) and L-phenylalanine (21 g/l) and pH value of 5.0. Using this composition in a batch culture of 770 ml volume the highest concentration of 2-phenylethyl alcohol has been obtained – 6 mg/l. At the same time amount of phenylacetaldehyde, phenylacetic acid and phenyllactic acidhas reached 2.2 mg/l, 10.66 mg/l and 32.3 mg/l respectively.
3

Mechanistic insights into furan formation in Maillard model systems

86%
Adams A., Van Lancker F., Owczarek-Fendor A., De Meulenaer B., De Kimpe N.
Polish Journal of Food and Nutrition Sciences
|
2011
|
tom 61
|
nr Suppl.1
4
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Chemical investigation on Rose damascena Mill. volatiles; Effects of storage and drying conditions

86%
Koksal N., Aslancan H., Sadighazadi S., Kafkas E.
Acta Scientiarum Polonorum. Hortorum Cultus
|
2015
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tom 14
|
nr 1
The oil bearing rose (Rosa damascena) is the most important rose species in terms of fragrances and flavourings. Due to the very short blooming period and excessive amount of flowers, considerable amount of the rose flowers wait for a long time until distillation. There are losses of essential oil yield and quality use of before waited petals. The cold storage and drying applications may be alternative method for evaluate of excessive amount of flowers. Therefore in this study it was aimed to determine the effects of storage on cold (4°C) and room condition (25°C) and convective drying with different temperatures (40, 50 and 60°C) in terms of changes in volatile compositions of oil rose flowers based on direct hexane extraction. Totally 20 volatile compounds were identified in fresh, stored and dried rose petals. The detected compounds varied according to the various storage and drying conditions. It was determined that phenylethyl alcohol, citronellol, geranyl acetate, nonadecane were predominant compounds on all treatments. In the study, storing treatments led to increase on the percentage of oxygenated monoterpenes (OM) while drying treatments led to decrease on OM. It was determined that storing and drying treatments led to increase on the percentage of benzenoid compounds (BC) and aliphatic hydrocarbons (AH).
5

Comparison of oxidative stability of different edible oils

86%
Gromadzka J., Wardencki W.
Nauka Przyroda Technologie. Uniwersytet Przyrodniczy w Poznaniu
|
2009
|
tom 03
|
nr 4
6

Solid phase microextraction for profiling volatile compounds in liquered white wines

86%
Jelen H. H., Szczurek A.
Acta Scientiarum Polonorum. Technologia Alimentaria
|
2010
|
tom 09
|
nr 1
23-32
Background. Profile of volatile compounds is a distinct feature of wine, which is dependent on the type of wine, grapes, fermentation and ageing processes. Profiling volatile compounds in wine using fast method provides information on major groups of compounds and can be used for classification/differentiation purposes. Solid phase microextraction (SPME) was used for the profiling of volatile compounds in liquered white wines in this study. Material and methods. Different fibers were tested for this purpose: PDMS, Carboxene/ PDMS, Carboxene/DVB/PDMS, Polyacrylate, Divinylbenzene/PDMS. Different times were compared to optimize extraction process. Profile and amount of volatile compounds extracted by SPME fiber was compared for eight liquered white wines. Results. Carboxene/DVB/PDMS showed the highest efficiency in extracting higher alcohols, esters, carbonyls and terpenes. Of tested extraction times ranging from 5 to 30 min. 20 minutes was chosen providing sufficient peak responses. Using SPME total amount of volatile compounds in eight liquered wines was compared - Riversaltes, Offley Porto and Jutrzenka having the highest amount of adsorbed volatiles. Profiles of volatiles of analysed wines revealed that dominating compounds in 6 wines were esters, followed by higher alcohols, two analysed Muscat wines had high terpene contents compared to remaining wines. Conclusion. SPME can be used for relatively fast profiling of wine volatiles, that can be used for wines classification.
7

Solid phase microextraction as a method for preparing environmental samples

86%
Ligor M., Buszewski B.
Polish Journal of Environmental Studies
|
1997
|
tom 06
|
nr 5
A new technique for sample preparation, Solid Phase Microextraction (SPME), is described. Theoretical and practical aspects and the particular possibility of using this technique in environmental analyses are discussed (application for analytical determination in different matrix). This paper will show many advantages as well as faults of SPME.
8

Determination of volatile carboxylic acids in some Polish cheese by solid phase microextraction and gas chromatography

86%
Kieronczyk A., Jelen H. H., Kaminski E.
Food Science and Technology. Scientific Papers of Agricultural University of Poznan
|
1999
|
tom 03
9

Application of solid-phase microextraction [SPME] to chromatographic determination of fusel alcohols in wines

86%
Sroka P., Tuszynski T.
Electronic Journal of Polish Agricultural Universities. Series Food Science and Technology
|
2002
|
tom 05
|
nr 2
A majority of the methods used for determination of fusel alcohols in wines by gas chromatography requires separation of the analysed substances from other components, mainly extract constituents, which can hamper the measurements. The aim of this study was to establish whether SPME method can be used for quick chromatographic determination of fusel alcohols in red wines. The studies were conducted on different red wines commercially available on domestic market. It was shown that the results for isobutanol were usually overestimated, while butanol recovery ranged from 97 to 116%, and approximated actual content of this component in the test sample. Sorption of amyl alcohols on fibres was in the range from 82 to 95%. Addition of strong electrolyte, such as sodium chloride, to a wine increased mictoextraction efficiency and precision of chromatographic determination of fusel alcohols.
10

Influence of geosmin, dimethyl trisulfide, 2- and 3-methylbutan-1-ol on raw spirits quality

72%
Biernacka P., Plutowska B., Wardencki W.
Nauka Przyroda Technologie. Uniwersytet Przyrodniczy w Poznaniu
|
2009
|
tom 03
|
nr 4
11
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Emission of selected microbial volatile organic compounds released by Aspergillus niger growing on meranti wood (Schorea sp.)

72%
Cofta G., Waliszewska B.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2013
|
tom 82
12

Application of combined SPME and GC/MS techniques in investigations on the emissions of volatile organic compounds from surfaces finished with lacquer products used in furniture industry

72%
Stachowiak-Wencek A., Pradzynski W.
Folia Forestalia Polonica. Series B - Drzewnictwo
|
2009
|
tom 40
13
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Is it possible to detect lung cancer by trained dogs?

72%
Rudnicka J., Walczak M., Jezierski T., Buszewski B.
Health Problems of Civilization
|
2015
|
tom 09
|
nr 2
During the illness are released volatile organic compounds with specific smell which could have in diagnosis of diseases. The first aim of the study was qualitative and quantitative analysis of exhaled breath samples obtained from patients with lung cancer, healthy volunteers and people with other lung diseases by gas chromatography-mass spectrometry. This study showed that twenty compounds propane, ethanol, isobutane, butane, propanal, 1-propanol, 2-propanol, 2-methylfuran, 2-butanone, benzene, 2-pentanone, pentanal, hexanal, cyclohexanone, 4-heptanone, 2,4-dimethylheptane, 2,3,4-trimethylhexane, 2,3,5-trimethylhexane, 4-methyloctane, α-pinene separated two research groups of patients and healthy controls. The second goal was to evaluate the sensitivity and specificity of canine scent detection using 5 station scent lineup. Among lung cancer patients and complementary samples, overall sensitivity of canine scent detection was 85.54%, while specificity was 71.84%.
14
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Optimization of fiber types in the SPME technique to evaluate volatile organic compounds emitted by meranti (Schorea sp.) wood

72%
Cofta G., Waliszewska B.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
|
2013
|
tom 82
15

The solid phase microextraction method [SPME] in the analysis of monoterpene fraction of essential oils obtained from medicinal plants of Apiaceae family

72%
Madanecki P., Wierzchowska-Renke K., Guzewska J., Glowniak P., Ochocka J. R., Furmanowa M.
Herba Polonica
|
2004
|
tom 50
|
nr 3-4
Solid Phase Microextraction (SPME) is used as a quick and easy alternative to standard distillation in essential oils composition assays. Due to the absence of the distillation step a considerable reduction of sample volume and of the time of sample preparation is possible. This method was used in experiments with essential oils obtained from Crithmum maritimum L. and Centella asiatica Urban (= Hydrocotyle asiatica L.). In this work the overground parts of Crithmum maritimum were analysed. The material was collected in 2003 from places of natural occurrence in Greece and Croatia, from a garden cultivation in Gdańsk, during the whole vegetation period, from plants from a control group and plants fertilised with Tytanit formula. Centella asiatica material was collected directly from an in vitro culture and from plants cultivated for six months in flowerpots, where they were transferred after five passages of in vitro culture. The analysis of components of monoterpene fraction was performed by gas chromatography. The percentage and composition of essential oils were different in all the tested samples. Crithmum maritimum material (from places of natural occurrence and from garden cultivation) shows the biggest differences in the content of a-pinene, 7-terpinene and sabinene. Plants treated with a Tytanit solution responded by increase of total percentage of essential oil with higher contents of 7-terpinene and sabinene. In Centella asiatica a higher percentage of essential oil (mainly a-pinene) was observed in roots than in leaves. Leaves treated with Ti ions had a higher amount of a-pinene than the control ones. Solid Phase Microextraction (SPME) method enables fast estimation of interference of each tested factor on the biosynthesis and composition of the essential oil. SPME was also useful in selection of the proper material for next experiments.
16

Application of SPME-GC-FID technique for the detection of meat-accumulated organic solvent residues originated from animal feed produced from oil-extracted and recycled plant parts

58%
Virag D., Kiss A.
Polish Journal of Food and Nutrition Sciences
|
2011
|
tom 61
|
nr Suppl.1
17

Occurrence of trihalomethanes, particularly those containing bromine, in Polish drinking waters

58%
Luks-Betlej K., Bodzek D.
Polish Journal of Environmental Studies
|
2002
|
tom 11
|
nr 3
Trihalomethanes (methane derivatives containing chlorine and/or bromine) have been determined in drinking waters in Upper Silesia - the most industrious and most populated region in Poland. Halomethane content determination is based on Capillary Gas Chromatography (CGC) with Electron Capture Detector (ECD), while these compounds' isolation from waters by Solid-Phase Microextraction (SPME) is based on optical fibres coated with poly(dimethylsiloxane) phase. In liquid phase the microextraction technique was applied to extract the halogenated compounds from the drinking water coming from consumers' taps in the Upper Silesia region. This method showed precision in the range of 3-12% (R.S.D), depending on the compound. The volatile compounds were present in investigated water in the concentration range from a few ppb to sub ppb.
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