Naslov
APPLICATION OF FAAS AND EDXRF TECHNIQUES FOR THE DETERMINATION OF ESSENTIAL ELEMENTS (Mn, Fe, Cu, AND Zn) IN COFFEE SAMPLES - A CHEMOMETRIC APPROACH

Autori
Jablan, Jasna ; Bačić, Ivana ; Margui, Eva ; Queralt, Ignasi ; Hajduk, Nikolina ; Henčel, Iva

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

Izvornik
Book of abstract / - , 2022, 33-33

Skup
1. Simpozij analitičke atomske spektrometrije

Mjesto i datum
Zagreb, Hrvatska, 30.09.2022. - 01.10.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
coffee, elemental analysis, FAAS, EDXRF, chemometric approach

Sažetak
Coffee is the most commonly consumed functional beverage and the determination of the mineral composition of coffee beans can be of great interest to both consumers and producers. The mineral composition of coffee differs depending on the geographical origin and type of coffee. Zinc, copper, manganese, and iron are essential micronutrients that play an important role in many physiological processes. Since the human body cannot synthesize them, it is necessary to take them in with food or supplements.[1] In this paper, the composition of zinc, copper, manganese, and iron was determined using FAAS and EDXRF techniques. Although the FAAS technique is often used for the determination of heavy metal content, special attention is now paid to the use of analytical methods that take into account the principle of "green chemistry", i.e. primarily avoidance of time-consuming pretreatment by using concentrated acids for complete sample digestion, low amounts of reagents, as well as a fast, simple and safe procedure. In this sense, EDXRF becomes an important tool for qualitative and quantitative elemental analysis. The main objective of this work is to investigate the advantages and disadvantages of two different analytical techniques (FAAS and EDXRF) and different methods of sample preparation (wet digestion, dry digestion, powder sample, pellet) for the determination of the content of heavy metals (Zn, Cu, Mn, and Fe) in collected coffee samples that are commonly consumed. The specific objective of the study was to determine the possible relationship between the elemental composition of coffee samples and the coffee variety through chemometric data processing involving univariate and multivariate analysis. The univariate analysis showed that copper, manganese, and iron can be considered as the elements that account for the greatest difference between the samples studied. PCA analysis was performed for all coffee samples including the variables (elements analysed), and the loading diagram showed a close relationship between copper and manganese, copper and iron, manganese, and iron, and two significant factors related to the source of the elements in the coffee samples were determined. Cluster analysis was used to divide the samples into groups based on similarity of elemental composition. The resulting dendrogram shows the division of the coffee samples into four main groups, with similarity by coffee type among the samples within the same group, with one exception. A good correlation was found between the elemental composition and the coffee type, and the study shows that the variables studied can be used to distinguish the coffee types in terms of pure coffee and coffee with additives.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Farmacija

POVEZANOST RADA