Wyniki wyszukiwania - AGRO

1

Quality of the dissolved organic matter [DOM] in the water of Lake Wigry [spectrophotometric analysis]

100%

Dunalska J., Zdanowski B.

Polish Journal of Natural Sciences

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2004

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tom 16

214-221

2

Spectrophotometric study on betanin degradation under the influence of metal cations

100%

Wybraniec S., Sporna A., Stalica P., Mitka K., Kowalski P., Surylo P., Michalowski T.

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

3

Spices as natural antioxidants in foods

100%

Akuneca I., Podjava A., Jakobsone I.

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

4

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Sensitive and selective extraction-free spectrophotometric determination of quetiapine fumarate in pharmaceuticals using two sulphonthalein dyes

100%

Rajendraprasad N., Basavaiah K., Vinay K. B.

Journal of Pre-Clinical and Clinical Research

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2010

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tom 04

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nr 1

5

Spectrophotometric determination of lead in the soil of allotment gardens in Lodz

100%

Jankiewicz B., Ptaszynski B., Wieczorek M.

Polish Journal of Environmental Studies

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2001

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tom 10

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nr 2

This work presents the results of determination of lead in the soils of six allotment gardens located in different parts of the city (in the centre and on the outskirts). Lead was determined spectrophotometrically in the form of pink lead(II) ditizonate.

6

Influence of humic substances on results of the spectrophotometric (TPTZ) analysis of monosaccharides

100%

Grzybowski W., Dudzinska M.

Oceanologia

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2004

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tom 46

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nr 3

A spectrophotometric method of monosaccharide analysis was assessed with regard to its non-selectivity towards humic substances. Analysis of model solutions showed that it responds positively to both marine and terrestrial humics. The systematic error in monosaccharide analysis (in glucose equivalents) was 0.18–0.20mg per 1 mg of Aldrich humic acid and 0.11–0.12 mg per 1 mg of humic substances isolated from Gulf of Gdańsk water.

7

The spectrophotometry determination of chelate complex: L-ascorbic acid with cuprum [II] and mercury [II] in alkaline solution

100%

Kleszczewska E.

Polish Journal of Environmental Studies

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1999

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tom 08

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nr 5

The aim of this paper is to present the chemical behaviour of cuprum (II) and mercury (II) in chelate complexes with L-ascorbic acid in alkaline solution. The results were interpreted by the spectroscopy method. Composition and total stability constants of the complexes were determined by Jacymirski method. In solution in with pH =9, H2 Asc forms complexes of the type [Me(Asc)2]-2; Me:L = 1:2. The complexes are of medium stability.

8

Detection of total phenols, essential and toxic elements in Latvian whole grain bread

84%

Bobere N., Podjava A., Jakobsone I.

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

Determination of chlorite in drinking water and related aspects of environment protection

84%

Herman M., Wieczorek M., Matuszek M., Tokarczyk J., Stafinski M., Koscielniak P.

Journal of Elementology

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2006

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tom 11

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nr 4

One possible method of drinking water treatment is chlorine dioxide disinfection. This technology, however, requires reliable control of its byproducts, including chlorite ions., which pose a threat to human health. In this paper an original procedure for flow indirect determination of chlorite in drinking water was described. This method relies on oxidization of chlorite ions by iron(III) in acid environment measurement of the spectrophotometric signal for the phenanthroline/iron(II) complex. The determinations were carried out by flow analysis with the use of a dedicated set of flow instruments. The method was used for analysis of natural samples collected from various water intakes in Kraków. The new analytic approach was compared with the routinely applied ion chromatography method.

10

Powstawanie barwników na dordze alkalicznej degradacji cukrów redukujących

84%

Farinas Bermjdez A., Chopik V. V., Cobas Rodolf M.

Gazeta Cukrownicza

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1989

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tom 97

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nr 06

11

Synthesis of quercetin-functionalized silver nanoparticles by rapid one-pot approach

84%

Pandian S. R. K., Kunjiappan S., Ravishankar V., Sundarapandian V.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2021

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tom 102

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nr 1

12

Determination of volatile fatty acids in environmental aqueous samples

84%

Siedlecka E. M., Kumirska J., Ossowski T., Glamowski P., Golebiowski M., Gajdus J., Kaczynski Z., Stepnowski P.

Polish Journal of Environmental Studies

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2008

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tom 17

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nr 3

351-356

Volatile fatty acids (VFAs) are present in environmental waters in the range of 1 to 5,000 ppm and different methods have been reported for their determination. In this paper we have studied and compared analytical performance parameters for the distillation method followed by potentiometric titration, spectrophotometric and gas chromatographic methods. The main disadvantage of the distillation approach was quite poor absolute recovery (53-58%) from the given matrix and rather elevated limit of quantification (LOQ) at 110 mg/L. Direct potentiometric titration was characterized by acceptable accuracy (above 97%) and precision in the range 1.8%-15%. The LOQ value was 11 mg/L. The spectrophotometric method was sensitive for hydrogen carbonate alkalinity and phosphate ions; measured concentrations of acetic acid were lower than nominal. The precision and accuracy of the spectrophotometric method were in the ranges 1.3-14% and 82.1-104.2%, respectively. Limit of quantification was 28 mg/L. However, if ion exchange bed is used prior to this method the LOQ can be reduced to 5 mg/L. The GC method is characterized by quite low LOQ (5 mg/L) and seems to be the best methodology to determine low VFA concentrations in environmental waters. The precision of the method ranged from 5.7 to 14.8% and accuracy was above 92%. Additionally, this method allows for determination of individual VFAs.

13

A method for studying the contribution of heavy metals in marine aerosol depending on the particle size distribution

84%

Felkier L., Brzezinska A., Garbalewski C.

Oceanologia

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1981

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tom 13

14

Comparison of three methods of DNA extraction in endocervical specimens for Chlamydia trachomatis infection by spectrophotometry, agarose gel, and PCR

84%

Jenab A., Roghanian R., Golbang N., Golbang P., Chamani-Tabriz L.

Archivum Immunologiae et Therapiae Experimentalis

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2010

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tom 58

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nr 3

227-234

15

Spectrophotometric studies of marine surfactants in the Southern Baltic Sea

84%

Drozdowska V., Jozefowicz M.

Oceanologia

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2015

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tom 57

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nr 2

16

Determination of the antioxidant activity of rutin and its contribution to the antioxidant capacity of diversified buckwheat origin material by updated analytical strategies

84%

Zielinska D., Szawara-Nowak D., Zielinski H.

Polish Journal of Food and Nutrition Sciences

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2010

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tom 60

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nr 4

The antioxidant activity of rutin and selected common buckwheat-originated materials, namely groat, hull, flour and sprouts were measured against stable, non-biological radicals such as 2,2’-azinobis-(3-ethylbenzothiazoline-6-sulphonate) radical cation (ABTS•+) and 2,2-diphenyl-1-picrylhydrazyl radical (DPPH•) using a spectrophotometric assay, against the key reactive oxygen intermediate – superoxide anion radical (O2 –•) with a photochemiluminescence assay (PCL) while reducing capacity was determined with the cyclic voltammetry method (CV). The antioxidant activity was presented independently of the techniques used as TEAC values and then the contribution of rutin to the antioxidant capacity of buckwheat material was calculated. The order of the antioxidant activity of rutin provided by the updated analytical strategy was as follows: CV = DPPH RSA > PCL > ABTS RSA. Buckwheat groat and hull represented low antioxidant capacity samples whilst that of sprouts was ranked as high antioxidant capacity one. The results showed a low contribution of rutin to the antioxidant capacity of buckwheat groat and hull. The highest contribution of rutin to the antioxidant capacity was noted in buckwheat sprouts, especially those produced in light. The specificity of the rank of methods used as CV = DPPH RSA > ABTS RSA > PCL was concluded since the lowest antioxidant gap was provided with CV and DPPH RSA whilst the highest one with ABTS RSA and PCL.

17

DSC, SDS-page and spectrophotometry for characterization of modified lysozyme

84%

Lesnierowski G., Kijowski J., Stangierski J.

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

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2003

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tom 06

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nr 1

The aim of the study was an attempt to apply selected analytical methods for the evaluation of preparations of modified lysozyme. Lysozyme isolated from hen egg white was modified using thermal, thermal-chemical, chemical and membrane methods and subsequently the obtained preparations were evaluated with the use of the spectrophotometric method, as well as electrophoresis and differential scanning calorimetry (DSC).

18

The determination of content of selenium in natural fruit juices by spectral methods

84%

Gawloska-Kamocka A.

Roczniki Państwowego Zakładu Higieny

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2008

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tom 59

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nr 2

The aim of this study was the evaluation of the content of selenium in natural fruit juices. In this study, the author determined trace quantities of selenium in fruit juices by three independent methods: atomic absorption spectrometry (AAS), spectrophotometry (UV-VIS) and spectrofluorometry (SF). None of the analysed samples contained elevated levels of selenium. Selenium content in the analysed samples was in the range of 0.46 µg/l - 0.94 µg/l average 0.65 µg/l. The level of selenium in any of the analysed samples of fruit juices did not exceed the WHO recommended level of 0.010 mg/ for drinking water.

19

Spectrophotometric determination of copper [II] in samples of soil from selected allotment gardens in Lodz

84%

Jankiewicz B., Ptaszynski B., Turek A.

Polish Journal of Environmental Studies

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1999

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tom 08

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nr 1

20

Analytical methods for determining arsenic, antimony and selenium in environmental samples

84%

Niedzielski P., Siepak M.

Polish Journal of Environmental Studies

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2003

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tom 12

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nr 6

This paper presents a comparative description of different methods of determination of arsenic, antimony and selenium: spectrophotometric, electro-analytical (voltamperometry), activation analysis, atomic fluorescence and the methods of inductive or microwave-induced plasma in combination with different detection methods (emission or mass spectrometry). The description is based on literature data illustrating the present state of the metalloid determinations in different matrices. The limits of determination ensured by different methods are also compared. Much attention has been paid to methods combining chromato- graphic separation with selective detection, especially with the application of plasma generation methods (usually ICP-MS).

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