APPLICATION OF INFRARED DRYING TECHNOLOGY FOR DEHYDRATION THYMUS MARSCHALLIANUS WILLD. HERB
UDK 615.322:582.949.27:542.47:57.086.142:54-74(045)
Abstract
The optimal and effective type of drying for plant raw materials allows to preserve the maximum amount of biologically active substances. This determines the relevance of the selection of dehydration conditions. We conducted a comparative study of anatomical and diagnostic signs and numerical indicators of Thymus marschallianus herb dried by natural (air-shade) and thermal (infrared) methods. The study showed that the raw materials dried in two ways have identical external signs and morphological and anatomical structure, approximately the same moisture content, extractive substances and essential oils. Extracts of Thymus marschallianus herb of two types of drying have similar chromatographic profiles and spectral characteristics – two pronounced maxima, similar in values, but the optical density on the differential spectra recorded after the addition of aluminum chloride is higher in Thymus marschallianus dried by infrared drying, which indicates a higher content of flavonoids. Infrared drying at a temperature of 30–32 °C for 2 days allows you to save more flavonoids without changing the qualitative composition and without leading to the loss of extractives and essential oils for Thymus marschallianus.
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