Abstract
Relevance.An analytical approach to choosing the direction of technological research has always been relevant, and taking into account the produc-tion of drugs using “green” extractants, the justification of technological parameters of extraction and its analytical support on models of already known, widely studied and used plant objects, for example, stinging nettle (Urtica dioica L.), can be considered as rational. The purpose of the study is an analytical study of carotenoids and chlorophylls in the co-presence of stinging nettle leaves and the rationale for the temperature regime for obtaining an oil extract from this plant, taking into account the co-presence of pigments in the extracts. Material and methods. The content of carotenoids and chlorophylls in raw materials and oil extracts was determined by spectrophotometry. Oil ex-tracts were obtained by fractional maceration at two temperature conditions: 25 °C and 50 °C. Results. The content of carotenoids and chlorophylls when jointly present in stinging nettle leaves was determined by spectrophotometry. When ob-taining six model oil extracts of stinging nettle leaves, the temperature regime was experimentally optimized at 50 °C; the optimization parameter was the quantitative content of carotenoids and chlorophylls. Conclusion. A detailed determination of the content of chlorophyll a, chlorophyll b, their sum and carotenoids in the presence of chlorophylls gives a detailed idea of the quantitative ratio of these types of pigments in the raw material and makes it possible to eliminate the overlap of absorption bands of carotenoids and chlorophylls. This approach made it possible to optimize the temperature conditions for obtaining the oil extract of nettle leaves. The applied analytical approach can be used to control the content of carotenoids and chlorophylls when present together to optimize the technological pa-rameters of oil extracts obtained from other types of medicinal plant raw materials.
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