The influence of technological parameters - temperature, hydromodule (proportion between row material/solvent (g/cm3)) and duration of extraction, on the yield and composition of ethanol extracts from Bulgarian white oregano (Origanum heracleoticum L.) whit 70 % ethanol was studied. The yield of extracts and tannins content were defined. The highest yield and content of tannins in ethanol oregano extracts was determined in the following parameters: hydromodule 1:10, 60 OC and the duration of the process 6 hours.
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Baycheva et al. (2019) studied this question.
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