engleski

The estimation of kinetic parameters of the solid-liquid extraction process of the lavender flower (Lavandula x hybrida L.)

The use of medicinal plants has been well documented for the past several decades. Plants from the Lavender genus are used for culinary purposes, but also as part of herbal medicine, owing its benefits to essential oils and bioactive compounds. A detailed description of the extraction process dynamics is required to obtain the highest possible amount of bioactive compounds from lavender. In this study, a solid-liquid extraction of lavender flowers, using water as a solvent, was performed. Total polyphenols, dry matter, conductivity, and total dissolved solids were determined in regular time intervals and experimental data was further used for mathematical modelling. Peleg’s, Page’s, and logarithmic models were applied in order to describe the kinetics of lavender solid-liquid extraction. The initial extraction rate and extraction capacity were determined for three different extraction temperatures: 40, 60, and 80 °C. The obtained results indicated that the initial extraction rate and the extraction capacity was the highest at 80 °C. The adequacy of the applied mathematical models was estimated based on R2 and SRMSE values, which indicated that the most adequate model for solid-liquid extraction of lavender was the Peleg model (R2 = 0.995, for total polyphenols at 40 ºC and R2 = 0.975 for dry matter at 60 °C, respectively).

lavender ; solid-liquid extraction ; mathematical modelling

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