Naslov
Determination of the Content of Selected Metals in Croatian wines by Total Reflection X-ray Spectrometry – the chemometric approach

Autori
Vitali Čepo, Dubravka ; Karoglan, Marko ; Borgese, Laura ; Depero, Laura ; Margui, Eva, Jablan, Jasna

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
European X-ray Spectrometry Association (EXSA 2021) Book of Abstract / - , 2021, 70-70

Skup
1st virtual conference on X-ray Spectrometry European X-ray Spectrometry Association (EXSA 2021)

Mjesto i datum
Online, 21.06.2021. - 22.06.2021

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
wine, TXRF, elemental analysis

Sažetak
The elemental composition of wine depends on soil properties, climatic conditions, cultivation and winemaking practices and is directly related to the quality, organoleptic characteristics and health safety of wine [1]. The aim of this study was to examine the impact of geographical origin and type of wine on the content of selected metals such as K, Ca, Fe, Cu, Zn, Mn, Sr, Rb, Ba, Pb, Ni, Cr and V in 70 red and white wine samples from different regions of Croatia (continental and Adriatic part) using total-reflection X-ray spectrometry (TXRF). TXRF was chosen as the method of choice since it does not require complicated and time- consuming sample preparation methods such as acid digestion, which makes it simpler and greener analysis approach in comparison to other more commonly used techniques [2]. Basic statistical tests and unsupervised and supervised classification methods were used to present statistically significant differences between the studied groups, to indicate if there are any patterns or trends, to explore possible wine and variable classes, or to reduce the number of variables in order to explain the data variation as much as possible. Significant differences were found in the contents of Mn, Ni, K, Rb, Sr and Ba between categories. Principal component analysis and cluster analysis showed that the variables used had sufficient explanatory power to group them according to geographical origin and the type of wine. It was found that Mn, K, Ni and Sr were the most important variables differentiating by type of wine, while Rb and Ba were the most important variables related to origin. Finally, linear discriminant analysis showed good recognition and prediction abilities using these selected elements. The recognition ability was 100%, while the prediction ability was 96.43%. The contents of almost all of the analyzed metals were below the maximum permissible contents (MPC) set by the Croatian legislation and also below the MPC in wine set by the Office International de la Vigne et du Vin (O.I.V).

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Farmacija

POVEZANOST RADA