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Wyszukujesz frazę "stability studies" wg kryterium: Temat


Wyświetlanie 1-6 z 6
Tytuł:
Studies on stability of emulsions containing carotenoids
Autorzy:
Igielska-Kalwat, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/1038379.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
carotenoids
particle size
semisolid formulations
stability studies
Opis:
Emulsions are commonly used to improve aesthetics but they may also be applied to deliver active ingredients. Recently, a group of pigments known as carotenoids has been added to emulsions as an active compound mainly due to their antioxidant properties. The stability of these formulations is a critical parameter for both, pharmaceutical and cosmetics industry. Therefore, in this study two analytical methods, multiple light scattering and laser diffraction, were tested to determine the stability of various emulsions containing carotenoids (β-carotene, lycopene, astaxanthin). Even small changes in stability of emulsions were determined very early. The results of both methods proved that the type of carotenoid used did not influence the emulsions' stability. The stability of emulsions depends mainly on the preparation methods and on the type of emulsifier applied.
Źródło:
Acta Biochimica Polonica; 2018, 65, 3; 455-463
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metody analityczne badania preparatów kosmetycznych - wczoraj i dziś
Analitical methods for testing cosmetic products - in the past and nowadays
Autorzy:
Olejnik, Anna
Gornowicz-Porowska, Justyna
Gościańska, Joanna
Powiązania:
https://bibliotekanauki.pl/articles/2200575.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
produkty kosmetyczne
chromatografia
spektrometria mas
test aplikacyjny
badania stabilności
cosmetic products
chromatography
mass spectrometry
application test
stability studies
Opis:
The safety and quality of each cosmetic product is tested before it is introduced to the market. There are highly regulated requirements that producers should comply with. However, as the cosmetic products are highly complexed mixture of different ingredients, detailed characterization of their composition remains still a challenge. Currently, due to the development of modern technologies, a wide range of analytical methods are available. Scientists are increasingly adapting highly sophisticated and advanced techniques to precisely identify and quantify the components of cosmetic products. The aim of this article is to present the analytical methods applied to examine cosmetics taking into account their advantages and limitations. The progress made in recent years in the design of novel instruments leading to their greater efficiency, selectivity and sensitivity was also considered. The techniques that are commonly used in the quality control laboratories of cosmetic companies were presented. Cosmetics analysis is not only limited to the characterization of product itself. Today, in vivo tests are very essential to determine the efficacy of formulations directly on the skin surface. Therefore, in this article modern devices dedicated to theses analyses were described in detail.
Źródło:
Wiadomości Chemiczne; 2022, 76, 7-8; 607--633
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
DETERMINATION OF FLUCONAZOLE AND ITS OXIDATION PRODUCTS WITH KINETIC EVALUATION UNDER POTASSIUM PERMANGANATE TREATMENT IN ACIDIC SOLUTIONS BY ULTRA PERFORMANCE LIQUID CHROMATOGRAPHY-TANDEM MASS SPECTROMETRY
Autorzy:
Hubicka, Urszula
Krzek, Jan
Żmudzki, Paweł
Żuromska-Witek, Barbara
Motyl, Dariusz
Kryczyk, Agata
Powiązania:
https://bibliotekanauki.pl/articles/895338.pdf
Data publikacji:
2019-02-28
Wydawca:
Polskie Towarzystwo Farmaceutyczne
Tematy:
stability
fluconazole
oxidation studies
kinetic evaluation
UPLC/MS
Opis:
For the determination of fluconazole (FLU) oxidation stability under permanganate treatment at the acidic pH, a sensitive, reproducible, and stability-indicating ultra-performance liquid chromatography–mass spectrometry (UPLC/MS) method was developed. Three additional products (tR = 5.79, 6.98, 7.54) were observed besides the FLU (tR = 6.22). The proposed method was used to study the kinetics of FLU oxidative degradation. An oxidation process followed kinetics of the second-order reaction. The degradation rate constant and the corresponding half-life obtained for the FLU oxidative degradation were 0.5626 h-1 and 16.69 h, respectively. The putative oxidation products were characterized and their fragmentation pathways, on a basis of MS/MS data, were proposed.
Źródło:
Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 1; 19-27
0001-6837
2353-5288
Pojawia się w:
Acta Poloniae Pharmaceutica - Drug Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis, characterization, biological activity of Schiff bases derived from 2-bromo-4-methyl aniline and its potentiometric studies with Cu(II), Co(II) and Ni(II) ions
Autorzy:
Upadhyay, Surbhi V.
Zala, Raksha V.
Bhatt, Keyur D.
Powiązania:
https://bibliotekanauki.pl/articles/1030767.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
2-bromo-4-methyl aniline
Antimicrobial activity
Irving-Rossotti
Potentiometric studies
Schiff base
Stability constant
Opis:
Schiff bases namely, 2-bromo-4-methyl-N-(2-nitrobenzylidene)aniline; 2-bromo-4-methyl-N-(2,4,5-trimethoxybenzylidene)aniline; 2-bromo-N-(4-methoxybenzylidene)-4-methylaniline and N-((1H-indol-3-yl)methylene-2-bromo-4-methylaniline have been synthesized and characterized by elemental analysis, FT-IR, Mass and 1H-NMR spectroscopy. Schiff bases have been screened for Antimicrobial activity against bacteria and fungi by using MIC determination. Binary complexes of Co(II), Ni(II) and Cu(II) with Schiff bases in solution have been studied potentiometrically in 60:40 % (V/V) 1,4-dioxane-water system at constant temperature 27 ±0.5 ºC and at an ionic strength of 0.1 M KNO3. The order of stability constant of formed binary complexes in solution was examined.
Źródło:
World Scientific News; 2020, 145; 1-15
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative study of phenol degradation with a wild-type and genetically modified P. vesicularis (pBR322). plasmid stability and fame profiling
Autorzy:
Mrozik, A.
Swędzioł, Ż.
Miga, S.
Powiązania:
https://bibliotekanauki.pl/articles/207456.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
biodegradation
phenols
comparative studies
fatty acid methyl ester
phenol degradation
plasmid stability
biodegradacja
kwasy tłuszczowe
fenole
badania porównawcze
ester metylowy kwasu tłuszczowego
degradacja fenolu
stabilność plazmidu
Opis:
It was evidenced that P. vesicularis is an efficient degrader of phenol but does not have a reporter system for monitoring bacterial survival in the environment. Therefore, P. vesicularis (pBR322) has been constructed. In this study we experimentally confirmed that introduction of plasmid pBR322 into P. vesicularis did not change its ability to degrade phenol in liquid media and after its inoculation into sterile soil. Moreover, it has been shown that plasmid pBR322 was stable in P. vesicularis during all experiments. Additionally, the pattern of fatty acid methyl esters for P. vesicularis (pBR322) looked similar to that of P. vesicularis under phenol exposure. Some fatty acids, especially branched and cyclopropane ones were sensitive markers of phenol utilization. These findings indicate that P. vesicularis (pBR322) due to the presence of plasmid could be used instead of P. vesicularis in bioaugmentation of phenol-contaminated areas.
Źródło:
Environment Protection Engineering; 2015, 41, 1; 137-155
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Praktyka laboratoryjna i warunki jej stabilności. Wokół stanowisk Pawła Zeidlera oraz Iana Hackinga
Laboratory Practice and Conditions of Its Stability. Remarks on Paweł Zeidler’s and Ian Hacking’s Views
Autorzy:
Bińczyk, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/577432.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Socjologia wiedzy naukowej
studia nad nauką oraz technologią
nowy eksperymentalizm
praktyka laboratoryjna
stabilność nauki
rola metafor w nauce
krytyka reprezentacjonizmu
teza Duhema
solidne dopasowanie
interaktywna stabilizacja
metrologia
Sociology of Scientific Knowledge
Science and Technology Studies
New Experimentalism
laboratory practice
stability of science
the role of metaphors in science
the criticism of representationalism
Duhem thesis
robust fit
interactive stabilization
metrology
Opis:
The article presents the specificity of standpoints in which laboratory, instrumental and practical aspect of science is strongly underlined. This is mainly Sociology of Scientific Knowledge (Science and Technology Studies, STS), but also the interesting conception of a Polish philosopher, Paweł Zeidler, who analyses laboratory practice of chemistry. The text indicates the originality of Zeidler’s view, its merits and weak points. The author polemicizes with Zeidler and proposes an alternative interpretation of Ian Hacking’s perspective, who describes the roots of stability of laboratory practice.
Źródło:
Zagadnienia Naukoznawstwa; 2012, 48, 3 (193); 163-183
0044-1619
Pojawia się w:
Zagadnienia Naukoznawstwa
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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