Wyniki wyszukiwania - AGRO

1

Some remarks on gas chromatographic challenges in the context of green analytical chemistry

100%

Wardencki W., Namiesnik J.

Polish Journal of Environmental Studies

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2002

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tom 11

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nr 2

As researchers involved in chromatography for 30 years we would like to present three approaches of implementation of principles of green chemistry into gas chromatography

2

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Bioassay and chemical assay of isoxaflutole residue in soil

88%

Swarcewicz M., Bhowmik P. C., Praczyk T., Skrzypczak G.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2003

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tom 492

The objective of this study was to evaluate plant bioassay techniques for various concentrations of isoxaflutole in soil and to compare them with the capillary gas chromatography (GLC). The field experiments with maize were conducted at three locations: South Deerfield, MA (USA), Brody and Winna Góra (Poland) in 1997 and 2000. A silt loam (typical Udifluvents soil) from South Deerfield, was used for the bioassay study. The chemical method was used for two soils from Experiment Stations, Brody and Winna Góra (Poland). The isoxaflutole half-life was 4 days in the Brody soil and 8 days in the South Deerfield soil. The degradation rate of isoxaflutole was very fast during the first ten days after treatment and the second phase of degradation was much slower. The bioassay method was more sensitive than the GLC and showed residues of the herbicide in the South Deerfield soil in 120 DAT. The amount of isoxaflutole residues in Brody soil was 15.3% in 21 DAT, if analyzed by GLC. In Winna Góra soil analyzed by GLC no residue was detected in 19 DAT. Bioassays have advantages over instrumental techniques because they provide more information on the biological significance of the remaining isoxaflutole, and its degradation products in soil. Instrumental methods are more costly and time consuming, as compared to bioassay methods.

3

Optimization of SPME-GC-MS analysis of chlorophenoxy herbicides

88%

Krzyzanowski R., Leszczynski B.

Herba Polonica

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2004

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tom 50

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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.

4

Analysis of the ability to form 2-phenylethyl alcohol by Galactomyces geotrichum MK017

75%

Grygier M., Majcher M., Myszka K.

Żywność Nauka Technologia Jakość

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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.

5

Metabolomics and protozoan parasites

75%

Paget T., Horoune N., Bagchi S., Jarroll E.

Acta Parasitologica

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2013

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tom 58

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nr 2

In this review, we examine the state-of-the-art technologies (gas and liquid chromatography, mass spectroscopy and nuclear magnetic resonance, etc.) in the well-established area of metabolomics especially as they relate to protozoan parasites.

6

Fatty acid profile and fat content in selected types of mustards

75%

Lyczko L., Walczak Z., Starzycki M.

Bromatologia i Chemia Toksykologiczna

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2014

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tom 47

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nr 2

7

Serum fatty acid contents and their relationships with bone quality indices and bone metabolism markers in male and female silver foxes (Vulpes vulpes)

75%

Tatara M. R., Luszczewska-Sierakowska I., Pyz-Lukasik R.

Folia Biologica

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2019

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tom 67

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nr 2

8

Strategy for the identification of key odorants in food

75%

Biernacka P., Chmiel T., Dymerski T., Wardencki W.

Polish Journal of Food and Nutrition Sciences

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2011

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tom 61

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nr Suppl.1

9

Comparison of oxidative stability of different edible oils

75%

Gromadzka J., Wardencki W.

Nauka Przyroda Technologie. Uniwersytet Przyrodniczy w Poznaniu

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2009

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tom 03

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nr 4

10

Study of chlorothalonil uptake in selected plant materials

75%

Zebrowski W., Ligor T., Buszewski B.

Polish Journal of Environmental Studies

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2008

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tom 17

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nr 3

321-326

The objective of this work was to create a sorption model of different pesticides in plant material. The above-quoted model includes graphic curves describing the pesticide’s behaviour in time (concentration level) depending on the place of sorption. Apart from curves the model also includes mathematical equations that allow us to predict the concentration of a pesticide in time function. The model has been developed based on research data obtained in a special experimental device. This article accounts for the transportation model of chosen xenobiotics in plants. Chlorothalonil were used as a model pesticide. Chlorothalonil is a nonsystemic fungicide that has been used to control disease of many fruits, vegetables, and other agricultural crops. As a method of sample preparation supercritical fluid extraction was used. Gas chromatography with mass spectrometry was used for qualitative and quantitative analysis. The detection limit (LOD) of chlorothalonil was on level 0.01 µg/g. and the limit of quantification (LOQ) was level on 0.03 µg/g.

11

Ethylene production as a biochemical marker for radish seed vigour

75%

Holubowicz R., Tylkowska K., Gruchala L.

Folia Horticulturae

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1993

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tom 05

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nr 1

12

Isolation, purification and identification of acetylcholine in Pharbitis nil seedlings

75%

Tretyn A., Lukasiewicz-Rutkowska H., Kopcewicz J.

Acta Physiologiae Plantarum

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1997

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tom 19

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nr 3

Acetylcholine (ACh), a well known animal neurotransmitter was isolated from tissues of Pharbitis nil using five different methods. Its presence in plant extract was confirmed by infrared spectroscopy and mass spectrometry. For quantitative estimation of ACh in P. nil seedlings pyrolysis-gas chromatography was applied. The presence of ACh was found in all organs of the examined plant: seeds, shoot apex, cotyledons, leaves, shoots and roots. However, the highest level of the investigated substance was noted in the youngest growing parts. In 5-day-old etiolated seedlings they were cotyledons, whereas in 14 day-old green plants - shoot apex and young leaves.

13

Detection of microbial contamination of packaging for foodstuffs by using muramic acid as a biomarker

75%

Mielniczuk Z., Pogorzelska Z.

Opakowanie. Special Edition

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2004

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nr 1

14

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

75%

Kieronczyk A., Jelen H. H., Kaminski E.

Food Science and Technology. Scientific Papers of Agricultural University of Poznan

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1999

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tom 03

15

Measurements of concentration of the trace gases active in the greenhouse effect

75%

Lasa J., Drozdowicz B., Sliwka I., Rosiek J.

Geographia Polonica

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1994

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tom 62

16

Changes in cellular fatty acid composition induced by phenol and catechol in Pseudomonas vesicularis and Pseudomonas stutzeri

75%

Mrozik A., Labuzek S., Piotrowska-Seget Z.

Biotechnologia

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2004

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nr 1

17

Changes in ethylene emission after pollination in maize [Zea mays L.]

75%

Filek M., Mol R., Pienkowski S., Matthys-Rochon E.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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1999

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tom 41

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nr 1

18

Application of a perchlorination method to assay food contamination by polychlorinated biphenyls and insecticides

75%

Rak L., Adamczyk E.

Electronic Journal of Polish Agricultural Universities. Series Veterinary Medicine

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2006

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tom 09

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nr 1

Polychlorinated biphenyls (PCBs) and chloroorganic insecticides interfere with gas chromatographic analysis, thereby complicating their quantitative determination when multiple compounds are assayed. Perchlorination of the standards of the chlorinated compounds was used to simplify quantitative determination of these contaminants. Results indicate that perchlorination converts PCBs to a single compound (decachlorobiphenyl – DCB) that does not interfere with the assay for chloroorganic insecticides. These data confirm that perchlorination allows for simultaneous testing of both PCBs and chloroorganic insecticides during chromatographic analysis.

19

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

75%

Sroka P., Tuszynski T.

Electronic Journal of Polish Agricultural Universities. Series Food Science and Technology

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2002

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tom 05

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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.

20

Mono- and oligosaccharides composition of some Polish unifloral honeys by means of gas chromatography

75%

Rybak-Chmielewska H., Szczesna T.

Pszczelnicze Zeszyty Naukowe

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2000

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tom 44

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nr 2

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