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Chemometric tools in the investigation of the mineral composition of food products derived from seaweed

Reczyński Witold, Musiał Joanna, Wójcik Szymon, Jakubowska Małgorzata

Analit

2022

Nr 11

2--18

The work presents a new chemometric-assisted approach to distinguish commercially available food products based on their chemical composition. The analysed material consisted of 15 seaweeds (red Rhodophyta and brown Phaeophyta macroalgae) of various origin. The concentrations of the main nutrients (K, Na, Ca, and Mg) and essential trace elements (Fe, Mn, and Zn) were determined using flame atomic emission spectroscopy and atomic absorption spectrometry. The highest concentrations of nutrients were found in the products of brown algae (for example: the highest concentration of Ca was determined in the Kombu algae product - 13.92 mg/g dr.wt.; Mg - in Wakame - 9.85 mg / g dr.wt.) compared to the products of red algae (the lowest concentrations of Ca and Mg were found in Dulce algae - 1.87 mg / g dr.wt. and 2.83 mg / g dr.wt., respectively). Chemometric tools, i.e. principal components analysis and cluster analysis combined with heat maps allowed to distinguish samples clearly by species, red algae (Nori, Dulse, Irish moss) from brown ones (Wakame, Kombu). However, neither the place of harvest (country of origin) nor the food processing has allowed the separation of the food samples into individual groups. It was proven that the nutritional properties of food derived from naturally grown sea algae depend on the characteristic of the species, rather than on the place of harvest. Furthermore, the method of food processing changes its mineral composition to a very limited degree.

Badanie zawartości wybranych metali ciężkich – ołowiu i kadmu w przekroju gleby

Linnert Aleksandra, Musiał Joanna

Analit

2019

Nr 7

32--43

Praca dotyczy oznaczania zawartości metali ciężkich takich jak ołów i kadm w warstwie wierzchniej i spodniej gleby. Próbki analizowanej gleby pochodzą z obszarów przemysłowych zlokalizowanych niedaleko Olkusza w województwie małopolskim. Jako metodę oznaczenia wspomnianych wyżej metali zastosowano woltamperometrię stripingową różnicową oraz atomową spektroskopię absorpcyjną. Dodatkowo zbadano zależność pomiędzy zawartością ołowiu, a pH gleby. Główny cel pracy to analiza zawartości ołowiu i kadmu w pionowym profilu przekroju gleby i skorelowanie uzyskanych wartości stężeń z pH gleby.

This work concerns the study of heavy metals such as lead and cadmium in the top and bottom layers of the soil. The samples come from industrial areas located near Olkusz in the Małopolska. Concentrations of the selected elements were determined with stripping voltammetry and atomic absorption spectroscopy. In addition, the relationship between the lead concentration and pH of the collected soil samples was examined. The main objective was to compare the concentration of heavy metals in the soil profile and to correlate it with the soil pH value.