Wyniki wyszukiwania

1

Solid phase extraction and liquid chromatography analysis of sulfonamide residues in honey

100%

Posyniak A., Sniegocki T., Zmudzki J.

Bulletin of the Veterinary Institute in Puławy

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2002

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tom 46

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nr 1

2

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Decomposition of apple leaves and roots in soil

86%

Adamska D., Politycka B.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

2002

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tom 481

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nr 1

The studies have been performed to trace changes in the soil content of phenolic compounds entering from decomposing apple leaves and roots, depending on the type and pH of soil and the rate of added apple residues. In has been found that roots added to soil were a richer source of phenolic compounds than leaves. Amount of phenols entering to soil from apple leaves and roots was in proportion with the applied rates of apple residues. A gradual fall in the content of phenolic compounds was found to occur in three successive months. But root residues added to the soil at a relatively high rate delayed this process. Neither liberation of phenolic compounds from the added apple residues nor the later fall of their content depended on the type and pll of the applied soil.

3

High performance liquid chromatographic determination of insecticides in forest biocenosis

86%

Kaniowska-Klarzynska E., Nowacka-Krukowska H., Neubart K., Glowacka B.

Pestycydy

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2004

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nr 1-2

91-103

4

Detecting and determining carazolol residues in biological samples

86%

Posyniak A., Semeniuk S., Niedzielska J., Zmudzki J.

Polish Journal of Environmental Studies

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1996

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tom 05

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nr 4

A simple and rapid method is described which allows analysis of Carazolol (ß-blocker agent) in tissue of pig by thin layer and liquid chromatography. The method utilizes an octadecyl solid phase column that selectively absorbs this drug and significantly improves sample clean-up procedure. The compound is eluted from the column with acidic acetonitrile. Analysis is performed using TLC for detection and qualitative determination and isocratic reversed-phase LC for confirmation and quantitation. The detection limit was 10 ng g-1 (TLC) and 2 ng g-1 (LC). The recoveries of Carazolol from spiked samples were above 80%. The procedure is suitable for routine residue analysis.

5

Determination of chloramphenicol residues in milk by gas and liquid chromatography mass spectrometry methods

86%

Sniegocki T., Posyniak A., Zmudzki J.

Bulletin of the Veterinary Institute in Puławy

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2007

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tom 51

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nr 1

Analytical methods based on gas chromatography- mass spectrometry (GC-MS/MS) and liquid chromatography- mass spectrometry (LC-MS/MS) were developed for the determination of chloramphenicol (CAP) in milk. GC-MS/MS was performed in negative chemical ionization (NCI) mode by monitoring the transitions - m/z 466→304, 466→322, and the results were compared with LC-MS/MS, in electrospray mode by monitoring the transitions of all the selected ions m/z 321→152, 321→257. The decision limit (CCα) for CAP determination by LC-MS/MS was established at a level of 0.11 µg/kg, while the corresponding value for GC-MS/MS was 0.083 µg/kg. Detection capability (CCß) for CAP by LC- MS/MS was 0.15µg/kg and for GC-MS/MS was 0.14 µg/kg. As it was found, both methods are useful for CAP determination in milk.

6

Studies on the coupled-effect of lead and methylbromfenvinphos [IPO-63] on rat organisms

86%

Zasadowski A.

Polish Journal of Environmental Studies

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1993

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tom 02

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nr 2

Assesments were made of the effect of lead and methylbromfenvinphos (IPO-63) on rat organisms after single and mixed intoxication. The analyses were based on acetylcholine esterase activity in blood and methylbromfenvinphos residues in liver. It was found that intoxication with lead acetate before methylbromfenvinphos increased AChE inhibition in blood, this effect being different depending on the type of intoxication and the period after the intoxication. It was also found that earlier applications of lead acetate resulted in the changes of methylbromfenvinphos biotransformation and differentiated accumulation of this insecticide in rat liver in particular periods of the experiment. The results depended to a large extent on the type of intoxication and the dose of lead acetate.

7

Hormone residues control in slaughtered animals in Poland in 2000-2001

86%

Wozniak B.

Bulletin of the Veterinary Institute in Puławy

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2002

|

tom 46

|

nr 2

8

Persistent organic pollutants remaining in the environment of the Baltic Sea

86%

Sapota G.

Pestycydy

|

2004

|

nr 3-4

9

Analytical procedure for the determination of doxycycline residues in animal tissues by liquid chromatography

86%

Gajda A., Posyniak A., Pietruszka K.

Bulletin of the Veterinary Institute in Puławy

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2008

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tom 52

|

nr 3

A sensitive liquid chromatographic method for the determination of doxycycline in animal tissues has been prepared and validated. The extraction of the analyte from biological matrix was performed with the solution of oxalic acid and ethyl acetate. The samples were cleaned up by solid phase extraction (SPE) procedure using a carboxylic acid cartridge. Chromatographic separation was carried out on the C8 analytical column and the mobile phase consisting of acetonitryle-methanol-0.02 M oxalic acid (20:15:65, v/v/v), with the detection by UV detector at λ = 355 nm. This method has been successfully validated and used for the quantitative determination of doxycycline in animal tissues samples. Recoveries from spiked samples were from 65% to 90%. The decision limits (CCα) were 110 µg/kg and 610 µg/kg for muscles and kidneys, respectively.

10

Application of DI-SPME-GC-MS method for the analysis of MCPA residues in winter wheat tissues

86%

Krzyzanowski R., Leszczynski B., Gadalinska-Krzyzanowska A.

Herba Polonica

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2008

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tom 54

|

nr 3

The application of SPME/GC-MS in order to determine the (4-chloro-2-methylphenoxy) acetic acid (MCPA) residues in winter wheat seedlings tissues has been studied. The optimal conditions for the SPME of MCPA adsorption were 20 min. in 50oC and 6 min. in 220oC for desorption. The chlorophenoxy herbicide showed different level of accumulation in seedling tissues of studied winter wheat cultivars. The application of the SPME/GC-MS method for the MCPA residues monitoring and possible differences in its biodegradation in the studied wheat tissues is discussed.

11

Influence of herbicide and adjuvant application on residues in soil and plant of sugar-beet

86%

Kucharski M.

Journal of Plant Protection Research

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2003

|

tom 43

|

nr 3

12

Comparison of sensitivity of various screening assays and liquid chromatography technique for penicillin residue detection in milk

86%

Popelka P., Nagy J., Popelka P., Marcincak S., Rozanska H., Sokol J.

Bulletin of the Veterinary Institute in Puławy

|

2004

|

tom 48

|

nr 3

13

Polychlorinated biphenyl [PCB] congener residues in frutti di mare [seafood] products

72%

Witczak A., Leszczynska A.

Acta Scientiarum Polonorum. Technologia Alimentaria

|

2006

|

tom 05

|

nr 2

117-126

Considering high nutritive value and sensory qualities, the products manufactured of marine invertebrates are a desirable component of human diet. These products enjoy an increasing demand in Poland. However, considerable accumulation of chlorine- organic pollutants in the tissues of marine animals may pose a threat for consumers. The study included determination of the content of PCB congeners (28, 52, 101, 118, 138, 153, and 180 according to IUPAC) in tinned and pickled seafood products purchased in Szczecin’s fishshops. In all examined products the analysed congeners were found, only in “Octopus in vegetable oil” PCB 138 was not detected. The highest content, 13.8 μg-kg_l m.m. (99.237 μg-kg’1 lipids), was recorded for PCB congener 153 in “Squid in American sauce”. The lowest residue levels were found for PCB 101 (0.002 to 0.07 μg-kg'1 m.m.). The highest percentage (from among analysed congeners) in majority of examined products was found for PCB 153 (to 95% in “Octopus in vegetable oil”) and PCB 180 (to 58% in “Pickled mussels”). The lowest percentage was stated for PCB congeners 101 (to 2.2% in “Shrimps natural”) and 52 (to 9.9% in “Greenland shrimps in brine”).

14

Development and validation of a new method for determining nitrofuran metabolites in bovine urine using liquid chromatography - tandem mass spectrometry

72%

Rodziewicz L., Zawadzka I.

Roczniki Państwowego Zakładu Higieny

|

2013

|

tom 64

|

nr 4

Background. The use of nitrofurans as veterinary drugs in food-producing animals is banned throughout the European Union. Nevertheless, nitrofuran metabolites have been detected not only in animal products, but also in bovine urine. At present there are no methods yet published for the simultaneous detection of nitrofuran metabolites in bovine urine. Objectives. To develop and validate a method for determination of four key nitrofuran metabolites in bovine urine. Material and methods. The four nitrofuran metabolites (nitrofurantoin, furazolidone, nitrofurazone and furaltadone), were determined in bovine urine using LC-ESI-MS/MS. The procedure required an acid-catalysed release of protein-bound metabolites, followed by their in situ conversion into 2-nitrobenzaldehyde (NBA) derivatives. The sample clean-up was performed using a polymer extraction cartridge before hydrolysis. Nitrofuran metabolites were then determined using electrospray ionization in the positive mode, that had previously been separated on a Phenomenex Luna C-18 column. Results. The method was validated in accordance with the procedure outlined in the Commission Decision No. 2002/657/ EC. Urine samples were spiked with nitrofuran metabolite solutions at levels of 0.5, 1.0, 1.5 and 2.0 pg/kg. Recoveries ranged between 90 - 108% (inter standard-corrected), with a repeatability precision (RSD) of less than 19% for all four analytes. The decision limit (CC) and detection capability (DC) were obtained from a calibration curve and lay respectively within the following ranges: 0.11- 0.34 pg/kg and 0.13- 0.43 pg/kg. Conclusions. The developed and validated LC-ESI-MS/MS method allows four nitrofuran metabolites to be identified and quantitated in bovine urine. This analytical procedure meets the criteria defined in the Commission Decision No. 2002/657/EC.

15

Allelopathy in Solanaceae plants

72%

Mushtaq W., Siddiqui M. B.

Journal of Plant Protection Research

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2018

|

tom 58

|

nr 1

Solanaceae plants have strong allelopathic potential, and therefore the action is confirmed through: a) bioassays with liquid or various solvent extracts and residues, b) fractionation, identification, and quantification of causative allelochemicals. Most assessments of allelopathy involve bioassays of plant or soil extracts, leachates, fractions, and residues which support seed germination and seedling growth in laboratory and greenhouse experiments. Plant growth is also stimulated below the allelopathic threshold, however severe growth reductions may be observed above the threshold concentration depending on the sensitivity of the receiving species. Generally, seedling growth is more sensitive than germination, particularly root growth. Some approaches showed that field soil collected beneath donor plants significantly reduced or somewhat promoted the growth of the recipients plants. Petri dish bioassays with aqueous extracts of different parts of donor plants showed considerable phytotoxic activities in a concentration-dependent manner with leaf aqueous extracts being most dominant. Delayed seed germination and slow root growth attributable to the extracts may be baffled with diffusion effects on the rate of imbibition, delayed initiation of germination, and particularly cell elongation; the main factor that is responsible for affecting root growth before and after the tip penetrates the testa. Light and electron microscopy extract analysis at the ultrastructural level are correctly investigated. Several Solanaceae plants have allelopathic potential, and therefore the activities, kinds and quantity of allelopathic compounds differ depending on the plant species. The incorporation of allelopathic substances into agricultural management might scale back the development of pesticides and reduce environmental deterioration.

16

Influence of adjuvants on behavior of phenmedipham in plant and soil

72%

Kucharski M., Sadowski J.

Polish Journal of Agronomy

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2009

|

nr 01

17

Detection of medroxyprogesterone acetate residues in animal muscle tissues by using enzyme-linked immunosorbent assay and liquid chromatography tandem mass spectrometry

72%

Xu C., Pen C., Hao K., Jin Z., Chu X., Wang L.

Journal of Animal and Feed Sciences

|

2005

|

tom 14

|

nr 4

737-751

18

Saturacja i filtracja gęstych roztworów cukrowych

72%

Havlova E.

Gazeta Cukrownicza

|

1989

|

tom 97

|

nr 05

19

Możliwości wykorzystania osadów zgromadzonych w zbiornikach ścieków Cukrowni Łapy

72%

Martyjasik Z., Pawlat H.

Gazeta Cukrownicza

|

1988

|

tom 96

|

nr 07

20

Stany konsystencji błota saturacyjnego

72%

Smelik A., Halasowa G., Fuzy S.

Gazeta Cukrownicza

|

1989

|

tom 97

|

nr 06

Ograniczanie wyników

Solid phase extraction and liquid chromatography analysis of sulfonamide residues in honey

Decomposition of apple leaves and roots in soil

High performance liquid chromatographic determination of insecticides in forest biocenosis

Detecting and determining carazolol residues in biological samples

Determination of chloramphenicol residues in milk by gas and liquid chromatography mass spectrometry methods

Studies on the coupled-effect of lead and methylbromfenvinphos [IPO-63] on rat organisms

Hormone residues control in slaughtered animals in Poland in 2000-2001

Persistent organic pollutants remaining in the environment of the Baltic Sea