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1.
Recent Progress and Applications of Thermal Lens Spectrometry and Photothermal Beam Deflection Techniques in Chemical Analysis and Materials' Characterization
Mladen Franko, 2023, invited lecture at foreign university

Abstract: Initially the theoretical background relevant to recent developments of thermal lens spectrometry (TLS) which include TLS detection in liquid chromatography and in microfluidic flow injection analysis (μFIA) and to non-contact and non-destructive characterization of composite materials by beam deflection spectrometry (BDS) is presented. The advantages and basic characteristics of the TLS and BDS techniques are illustrated by presenting applications such as the determination of free bilirubin in endothelial cells by HPLC-TLS, studies of diffusion in Taylor-type microfluidic flows by thermal lens microscopy (TLM), μFIA-TLM detection of microcystin-LR and Cr(VI) in waters, and by the dept profiling of multi-layered coatings of orthopaedic implants. In the main part of the presentation the results of joint MU-UNG research are presented with emphasis on BDS and TLS characterisation of biocomposite materials from cellulose and chitosan or keratin with added Ag nanoparticles, sporopollenin capsules or antibiotics. The focus is on BDS determination of thermal parameters including thermal diffusivity and related properties relevant for medical applications, such as porosity and surface roughness, as well as on the TLS detection of Ag and other nanoparticles applied in studies of nanoparticle leaching from biocomposites.
Keywords: Optotermična spektrometrija, TLS, BDS, kemijska analiza, karakterizacija materialov, biokompoziti
Published in RUNG: 23.10.2023; Views: 682; Downloads: 1
.pdf Full text (25,02 MB)

2.
KEMIJSKA IN SENZORIČNA ANALIZA TIPIČNIH AROMATIČNIH LASTNOSTI VIN SORTE 'MODRA FRANKINJA'
Urban Hlade, 2023, undergraduate thesis

Abstract: 'Modra frankinja' (Vitis vinifera L.) je tradicionalna slovenska sorta grozdja, a kljub temu Slovenci o njej nismo dovolj seznanjeni. Tudi ko gledamo širši vinski svet, opazimo, da o tej sorti in njenih značilnostih vemo zelo malo. Po naših podatkih aromatične tipičnosti vin sorte 'Modra frankinja' še niso bile raziskane. Diplomsko delo je prva tovrstna raziskava te sorte. V delu smo želeli raziskati aromatične lastnosti vin te sorte s pomočjo neformalne senzorične analize. Na ta način smo povzeli katere senzorične note so na splošno izrazite pri obravnavani sorti vina. V nadaljevanju smo s kemijsko analizo aromatičnih spojin vzorcev vina to še kemijsko ovrednotili. Pri kemijski analizi smo se osredotočili na štiri skupine spojin, ki po našem mnenju krojijo tipičnost arom vin sorte 'Modra frankinja'. To so: monoterpeni, estri, norizoprenoidi in C6-alkoholi. Rezultati kažejo, da so prav predstavniki skupine terpenov tisti, ki se pojavljajo v največjih koncentracijah v obravnavanih vinih in pomembno krojijo aromatični profil vin 'Modra frankinja'. C13-norizoprenoidi so bili prisotni v večjih koncentracijah pri vzorcih sortnega vina 'Modra frankinja', kot pri vinih 'Modri pinot' ali vinih bordojskih sort. A še vedno vsebnosti C13-norizoprenoidi ostajajo precej manjše od zaznavnih senzoričnih pragov teh spojin.
Keywords: Vino, vitis vinifera L. 'Modra frankinja', kemijska analiza, estri, terpeni, norisoprenoidi, C6-alkoholi, plinski kromatograf, GC-MS.
Published in RUNG: 04.07.2023; Views: 1014; Downloads: 16
.pdf Full text (1,91 MB)

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