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Opis: In this work, new analytical approaches for determination of biogenic amines in wines were developed. For the first time, we studied the derivatization of BAs in wines with naphthalene- 2,3-dicarboxaldehyde (NDA) and with dabsyl chloride (DBS) and analysis of derivatized BAs by HPLC coupled to fluorescence (HPLC-NDA-FL) and thermal lens spectrometry (HPLC-DBS-TLS) detectors. The sensitivity of the two methods (LODs HPLC-NDA-FL in the range 27-73 μg/L; LODs HPLC-DBS-TLS in the range 3.4-11 μg/L) was higher than that of the official method for biogenic amines in wines, OIV-MA-AS315-18 (60-77 μg/L). For its best performances, the HPLC-DBS-TLS technique was applied to the analysis of putrescine, cadaverine, histamine and tyramine in two white wine samples. Additionally, exploiting the Berthelot reaction, the TLS fast screening of biogenic amines in wines, following the release of ammonia by transglutaminase, was also proposed. This approach allowed us to determine total biogenic amount content in concentrations below 0.1 mg/L, expressed as equivalents of histamine.
Ključne besede: biogenic amines, NDA, liquid chromatography, TLS, fluorescence, wine
Objavljeno v RUNG: 02.11.2017; Ogledov: 4449; Prenosov: 270
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Opis: Na predavanju, ki bo posvečeno spominu na Alojza Gradnika (1882‒1967) in njegovemu letos preminulemu sinu Sergeju Gradniku, bo dr. Ana Toroš uvodoma osvetlila življenje in delo Alojza Gradnika, doma iz Goriških Brd, s poudarkom na njegovem pesniškem in prevajalskem delu, pri čemer bo posebno pozornost posvetila manj znanim poglavjem na Gradnikovi bogati literarni poti.
Ključne besede: Alojz Gradnik, Sergej Gradnik, Argentina, Trst, migracije
Objavljeno v RUNG: 30.10.2017; Ogledov: 3994; Prenosov: 0
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Ključne besede: composition hyperring, partially ordered semigroup, hyperstructure
Objavljeno v RUNG: 30.10.2017; Ogledov: 3667; Prenosov: 0
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Opis: Photoelectrochemical water splitting has been demonstrated as a promising way to efficiently split water. Currently, solar-to-hydrogen conversion efficiency using state-of-the-art material combinations in PEC system is in the order of 7%. Fabrication of nanostructured materials with unique morphologies and compositions is an important factor to fully utilize the possibilities in this field. We will present different strategies for the preparation of nanostructured metal oxide thin films by using electrodeposition and wet-chemistry techniques. Focus will be given on the preparation of ZnO and CuO thin films where intermediate phases like Zn(OH)8Cl2.H2O and CuX (X=Br, Cl) were electrodeposited. Wet-chemistry synthesis techniques will be also explored for the preparation of nanostructured WO3 and a-Fe2O3 thin films. Especially, the hot-pyrolysis technique for the preparation of colloidal W and Fe/Fe-oxide nanoparticles will be shown. Spin-coating of W and Fe/Fe-oxide NPs onto optically conductive substrates and subsequent heat treatment of the obtained films was found to be a convenient way for the preparation of nanostructured WO3 and a-Fe2O3 thin films.
Ključne besede: photoelectrochemical water splitting, colloidal nanoparticles, semiconductor
Objavljeno v RUNG: 24.10.2017; Ogledov: 4439; Prenosov: 0
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Ključne besede: Kalibracija, dipolna antena, oktokopter, observatorij Pierre Auger
Objavljeno v RUNG: 23.10.2017; Ogledov: 3783; Prenosov: 0
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