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Myrtle Leaves (Myrtus communis L) and Olive Leaves (Olea europaea): Effect of Drying by Fluidization and Solar Methods on Key Bioactive Compounds Contents

Lekrati Mounia, Elfazazi Kaoutar, Laaraj Salah, Zerrouk Latifa, El Madani Saad

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 2

210--217

The present study aimed to evaluate the influence of drying by fluidization technology, compared to a traditional solar drying, on phenolic compounds of Moroccan Myrtus communis L. and Olea europaea L. species. Two main parameters of drying by fluidization (air speed (0.3-1 m/s for myrtle leaves and 1-3 m/s for olive leaves) and air temperature (40-60 °C for the two plants leaves)) were modified and controlled. Results showed that high loss values in total polyphenols (TPP) and flavonoids (TF) were observed at (60 °C; 0.3 m/s) for myrtle leaves and at (60 °C; 1 m/s) for olive leaves. However, these compounds were more stable at (40 °C; 1 m/s) for myrtle leaves and at (40 °C; 3 m/s) for olive leaves. Regarding the solar drying method, the results showed that, for myrtle leaves, high losses were observed in the TPP and TF contents, compared to the fluidization method for all processing parameters. For olive leaves, traditional solar drying gives products with phenolic contents similar to those obtained by fluidization drying, especially at (60 °C; 3 m/s). The findings indicated that employing the fluidization drying method might be a suitable approach for enhancing the conservation of bioactive compounds within myrtle and olive leaves.

Effect of fluidization time on thickness of composite protective-decorative coating

Bryll K., Pijanowski M., Gawdzińska K., Lijewski S.

Composites Theory and Practice

2014

R. 14, nr 2

71--75

This study examines how the fluidizing time influences the thickness and decorative properties of a protective coating created by the fluidization method. We have made two types of coatings: polyethylene and a composite (with polyethylene matrix and SiC particle reinforcement). The work, responding to the market demand for new attractive-looking materials, meeting certain preset criteria, such as coating thickness, is part of research into the selection of protective-decorative coatings for elements working in the natural environment, subject to UV radiation, wind and rain.

W niniejszej pracy poddano badaniu powłokę dekoracyjno-ochronną wytworzoną metodą fluidyzacyjną w celu określenia wpływu czasu fluidyzacji na grubość tej powłoki oraz jej właściwości dekoracyjne. Wytworzono dwa rodzaje powłok: polietylenową i kompozytową (o osnowie z polietylenu i zbrojeniu z SiC w postaci cząstek). Praca ta stanowi odpowiedź na zapotrzebowanie rynku na nowe materiały o odpowiednim wyglądzie estetycznym, określonych właściwościach (w tym wypadku grubości) i jest częścią badań związanych z doborem powłok ochronno-dekoracyjnym na elementy pracujące w środowisku naturalnym narażonym na oddziaływanie promieni UV, wiatru i deszczu.