EXTRACTION OF FLAVONOIDS FROM THE LEAVES OF THE LITTLEWALE LITHOSPERMUM OFFICINALE L. (BORAGINACEAE) USING MICROWAVE ENERGY
UDC 615.322:621.385.6
Abstract
One of the possible ways to intensify and increase the efficiency of extraction of biologically active substances from plant materials is the use of microwave radiation. This article presents the results of a study of the influence of parameters of the microwave extraction process on the output of flavonoids from the leaves of the littlewale (Lithospermum officinale L.), belonging to the Boraginaceae family. This plant contains isoquercitrin, which is one of the key flavonoids with the property of tissue regeneration. It was shown that the maximum yield of the target components is achieved with a microwave generator power of 100 W and exposure duration of 2.5 min at a field frequency of 2450 MHz (specific energy consumption is 8.4 kWh/kg). This output is comparable with the output when using conventional convection heating. Microwave radiation provides a 16-fold reduction in the duration of extraction of the sum of flavonoids and an increase in the degree of extraction of isoquercitrin by 23%. The action of microwave energy leads to the destruction of plant tissue, which contributes to a more efficient extraction of flavonoids from plant raw materials.
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