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    Wyświetlanie 1-3 z 3
    Tytuł:
    Zastosowanie spektrometrii oscylacyjnej w analizie fitozwiązków i substancji odżywczych w produktach naturalnych i spożywczych
    Applying vibrational spectroskopy in an analysis of phytochemicals and nutrients in natural and food products
    Autorzy:
    Mazurek, Sylwester
    Szostak, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/27310034.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    spektroskopia oscylacyjna
    chemometria
    analiza jakościowa
    analiza ilościowa
    klasyfikacja
    vibrational spectroscopy
    chemometrics
    qualitative analysis
    quantitative analysis
    classification
    Opis:
    The prevalence of lifestyle diseases and trends related to healthy eating contribute to the constant search for chemical compounds with specific biological activity. Studies are conducted on plants and substances of natural origin that have been used in medicine for millennia. Techniques of vibrational spectroscopy are an underrated group of methods enabling direct analysis of plant raw material and food in their native forms. The presented examples of Arabidopsis tissues, various species and hybrids of poplar and Cistus herb classification, as well as quantitative analyses of active compounds in plant material and pharmaceutical products and determination of physicochemical parameters of common food (i.e. milk, yoghurts, pasta and flour), demonstrate the possibility of using vibrational spectroscopy for comprehensive analysis of samples of natural origin. Typical measurement techniques and chemometric methods are briefly described in this paper. The scheme of quantitative analysis based on vibrational spectra is shown and the impact of selected experimental parameters on the accuracy of the obtained results is discussed. The imaging techniques used to analyse the changes in plant tissue structures caused by genetic mutations were also presented.
    Źródło:
    Wiadomości Chemiczne; 2023, 77, 7-8; 745--774
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie metod elektrochemicznych w bioanalityce : wybrane zagadnienia
    Electrochemical methods in bioanalytics : selected aspects
    Autorzy:
    Ufnalska, I.
    Wiloch, M. Z.
    Wesoły, M.
    Ćwik, P.
    Zabadaj, M.
    Ciosek, P.
    Wawrzyniak, U. E.
    Wróblewski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/171732.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    elektrochemia
    elektroniczny język
    chemometria
    kompleksy peptydjony miedzi(II)
    warstwy boroorganiczne
    electrochemistry
    electronic tongue
    chemometrics
    peptide-copper(II) complexes
    boroorganic layers
    Opis:
    The cooperation of scientists specializing in different fields has given rise to the integration of previously distinct thematic areas and creation of new multidimensional disciplines as a result. Biochemistry, which has derived from the borderline of chemistry and biology, can be set as a good example. In this short review an insight into electrochemical studies, which are currently carried out in the Department of Microbioanalytics at the Faculty of Chemistry (Warsaw University of Technology), was presented. Three independent scientific pathways introducing electrochemical methods for biochemical and bioanalytical purposes can be distinguished among the ongoing researches. The first one embraces the design of the so-called electronic tongue – a system used for the qualitative and quantitative analysis of liquid samples of complex composition. In this work, potentiometric sensor arrays were applied to develop an electronic tongue system enabling the evaluation of the effectiveness of bitter taste masking of pharmaceuticals. The second scientific pathway involves voltammetric studies of the interactions of biologically active peptides with copper(II) ions. The interest was drawn to clarify and describe the role of β-amyloid and NSFRY copper(II) complexes, relevant to Alzheimer’s disease occurrence and cardiovascular system disorder respectively. Finally, boronic acids and their derivatives, exhibiting the affinity for molecules possessing 1,2 or 1,3-diol group in their structure, were used as selective molecular receptors in the third research project. The studies include the selection of the optimal method and conditions of the immobilization process, providing the most favorable receptor layer structure, and the determination of the performances of constructed electrochemical sensor towards particular bioanalytes.
    Źródło:
    Wiadomości Chemiczne; 2015, 69, 9-10; 931-946
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemometryczne metody modelowania danych : studium porównawcze
    Chemometric methods of data modelling : a comparative study
    Autorzy:
    Kałka, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/171612.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    chemometria
    modelowanie danych
    twarde metody modelowania danych
    twardo-miękkie metody modelowania danych
    miękkie metody modelowania danych
    chemometrics
    data modelling
    hard data modelling
    hard-soft data modelling
    soft data modelling
    Opis:
    The chemometric methods of data analysis allow to resolve complex multi-component systems by decomposing a measured signal into the contributions of pure substances. Mathematical procedure of such decomposition is called empirical data modelling. The main aim and subject of this article is to provide some basic information on the chemometric analysis. The chemometric techniques are divided into three categories, resulting from the assumed premises. A base of hard type of modelling is an assumption, that the measured dataset can be a priori described by generally accepted physical or chemical laws, expressed by analytical forms of mathematical functions, however with unknown values of parameters [1]. Numerical values of those constants are optimised by using procedures such as the least squares curve fitting [1, 2]. When explicit form of equations are found, the whole system of data can be resolved. Therefore, the white types of data modelling are often used for kinetic measurements [3–8] and analysis of fluorescence quenching [9–13]. Completely different approach to data modelling is offered by so called soft chemometric methods [14–20]. Those techniques do not require any presumptions; solutions obtained for the considered system are thus far much more unconstrained. The black types of analysis make use not only of the least squares fitting procedures [18, 19], but also some other geometrical optimisation algorithms [16, 17]. The results of that approach suffer however from one main drawback: the final outcome is not unique – system is described by a set of feasible solutions. As a consequence, soft data modelling is generally applied to resolve empirical data, which cannot be easily expressed by an explicit form of a function. Such measurement techniques are for example chromatography or volumetry. However, if some conjecture could be made about the measurement system and the obtained data, it is possible to stiffen the black methods by applying white constraints [20]. These types of the chemometric analysis are called grey or hard-soft, and are a practical combination of model-free optimisation with the limitations of feasible solutions, resulting from conformity with physical or chemical laws. Due to the fact, that data modelling provides an opportunity for simultaneous identification of several components of the analysed mixture, the chemometric procedures, although not so popular yet, are extremely powerful research tools.
    Źródło:
    Wiadomości Chemiczne; 2018, 72, 5-6; 299-312
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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