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    Wyświetlanie 1-4 z 4
    Tytuł:
    Quantification of synthetic food dyes in beverages or pharmaceutical tablets by solid phase extraction (SPE) followed by UV/VIS spectrophotometry
    Autorzy:
    Sobańska, A. W.
    Jakubczyk, P.
    Pyzowski, J.
    Brzezińska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/105606.pdf
    Data publikacji:
    2018
    Wydawca:
    Centrum Badań i Innowacji Pro-Akademia
    Tematy:
    food dyes
    quantification
    SPE
    VIS spectrophotometry
    barwniki spożywcze
    kwantyfikacja
    VIS
    spektrofotometria
    Opis:
    Synthetic food dyes (E102, E104, E110, E122, E124, E132, E133) were concentrated by solid phase extraction on aminopropyl modified silica with aqueous sodium hydroxide or selected amines as eluents. Ponceau 4R (E124) was used as the model dye in the studies of the elution step. The recoveries of E124 differed depending on the eluent and ranged from 76% (AMP) to over 90% (TEA, imidazole, NaOH). Diluted aqueous triethanolamine (TEA) was found to be a suitable eluent for E124 but other dyes were eluted more effectively with NaOH. The solid extraction process was combined with UV/VIS spectroscopy to quantify synthetic dyes in drinks and OTC pharmaceutical tablets. The SPE-UV/VIS spectroscopic method was validated in terms of linearity, accuracy (recovery of dyes from spiked preparations), precision (repeatability, intermediate precision) and limits of detection/quantification. The method was found sufficiently fast, easy and reliable for the routine control of dyes in these types of products.
    Źródło:
    Acta Innovations; 2018, 27; 53-60
    2300-5599
    Pojawia się w:
    Acta Innovations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oznaczanie barwy bio-olejów z nasion roślin jagodowych otrzymanych techniką ekstrakcji nadkrytycznej za pomocą spektrofotometrii UV-Vis
    Determining the color of bio-oils from berry seeds obtained through supercritical extraction using UV-Vis spectrophotometry
    Autorzy:
    Rój, E.
    Dobrzyńska-Inger, A.
    Grzęda, K.
    Kostrzewa, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1287152.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    ekstrakcja nadkrytyczna
    bioolej
    barwniki żywności
    supercritical extraction
    bio-oil
    food dyes
    Opis:
    W pracy przedstawiono wyniki badań dotyczące spektrofotometrycznego oznaczania barwy bio-olejów otrzymanych techniką ekstrakcji, nadkrytycznej. 'Wykorzystana metoda pozwoliła na określenie zmiany udziału poszczególnych grup barwników w bio-olejach w zależności od czasu ekstrakcji, a w efekcie końcowym, na określenie przedziałów czasowych pozyskiwania ekstraktu o najbardziej pożądanej zawartości barwników.
    The paper presents :• esults of studies on the spectrophotometric determination of the color of bio-oils obtained by supercritical extraction techniąue. The method used allowed to identify the changes of individual groups of pigments in bio-oils depending on the extraction time, and finally, the result was to determine the intervals of sampling time to get the most desired content of pigments.
    Źródło:
    Chemik; 2011, 65, 9; 859-866
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody oznaczania barwników spożywczych
    Methods for the determination of food dyes
    Autorzy:
    Kałwa, K.
    Mazurek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/171756.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    barwniki spożywcze
    wysokosprawna chromatografia cieczowa
    HPLC
    spektrofotometria
    chromatografia cienkowarstwowa
    TLC
    elektroforeza kapilarna
    food dyes
    high-performance liquid chromatography
    spectrophotometry
    thin layer chromatography
    capillary electrophoresis
    Opis:
    Food dyes are chemical substances that were developed to enhance the appearance of food by giving it artificial color. People have added colorings to food for centuries, but the first artificial food colorings were created in 1856 from coal tar. Over the years, hundreds of artificial food dyes have been developed, but a majority of them have since been found to be toxic. There is only a handful of artificial dyes that are still used in food. Food manufacturers often prefer artificial food dyes over natural food colorings, such as beta carotene and beet extract, because they produce a more vibrant color [1]. However, there is quite a bit of controversy regarding the safety of artificial food dyes. All of the artificial dyes that are currently used in food have gone through testing for toxicity in animal studies. Regulatory agencies, like the US Food and Drug Administration (FDA) and the European Food Safety Authority (EFSA), have concluded that the dyes do not pose significant health risks. Not everyone agrees with that conclusion. Interestingly, some food dyes are deemed safe in one country, but banned from human consumption in another, making it extremely confusing to assess their safety [2]. Undesirable effects of azo dyes used for coloring food products led to the development of very sensitive and selective analytical methods successfully used for their determination in various food matrices. Many different methods have been employed for the determination of synthetic dyes in food and beverages including thin layer chromatography and capillary electrophoresis [3]. However, these methods can be time consuming and may not be applicable for the simultaneous analysis of many dyes. Conventional HPLC methods have been employed for the analysis of synthetic colorants and while useful, these methods require long analysis times and large amounts of expensive solvents [4, 5]. Preparation of the test sample involves the use of various techniques such as membrane filtration due to the complexity of food products. Therefore, the development of simple, selective extraction methods together with the combination of chromatographic and spectrophotometric techniques are of great importance [6]. One of the most difficult stages of the analysis is the appropriate selection of the method for the determination of food colors. In the case of spectrophotometric methods, the main advantage is the low cost of the determination, however, the lack of specificity of the absorption spectrum usually makes it difficult to apply this method in the case of a mixture of different absorbing dyes due to the overlap of the spectra. The CE (Capillary Electrophoresis) analysis is faster and more economical compared to conventional electrophoresis and chromatography. The production of cheap capillaries and the development of on-line detection systems contributed to the development of modern capillary electrophoresis. Capillary electrophoresis has a number of types of separation. Ultimately, it is impossible to determine the one particular appropriate specific method for the determination of food dyes due to their diverse structure and chemical composition [4, 7].
    Źródło:
    Wiadomości Chemiczne; 2018, 72, 9-10; 667-683
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie spektroskopii oscylacyjnej w detekcji barwników azowych w opakowaniach do żywności
    Application of vibrational spectroskopy in the detection of azo dyes in food contact packaging materials
    Autorzy:
    Kucharska, Edyta
    Michalski, Jacek
    Sąsiadek, Wojciech
    Dymińska, Lucyna
    Hołubniak, Paulina
    Hanuza, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/27310037.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    azo-dipirydyny
    fenylo-azopiridyny
    struktura krystaliczna
    widma IR i Ramana
    drgania normalne wiązań azowych
    barwniki azowe w opakowaniach żywności
    azo-dipyridines and phenyl-azopyridines
    crystal structures
    IR and Raman spectra
    vibrations of azo bridge
    azo dyes in food packing
    Opis:
    This work is a continuation of our research on spectroscopic and structural properties and applications of a number of azo-dipyridine and phenyl-azopyridine derivatives. In the previous works, the results of DFT quantum calculations were used to discuss infrared and Raman spectra. The presented study generalizes these results using the literature data on the structure of aromatic azo compounds. Analysis of the spectra and detailed assignment of the observed bands to the specific oscillating modes enables their application to identification of azo dyes widely used in the food industry. The bioactivity of azo dyes means that the safety of their use requires the search for new methods of their detection in food. The paper shows that vibrational spectroscopy is an effective diagnostic method for identifying not only the material from which the plastic foil is made, but also the dye used for its dyeing. In this work, the method was applied to colour plastic foils used as pasta packaging. It has been shown that this foil is made of polypropylene, and azo dyes, such as orange yellow (orange dye), tartrazine (yellow dye), allura red (red dye), brilliant blue (blue dye) and a mixture of yellow and blue dyes (green dye) were used for its dyeing.
    Źródło:
    Wiadomości Chemiczne; 2023, 77, 7-8; 687--718
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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