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Publisher: Altai State University
Journal: Khimiia rastitel'nogo syr'ia (Chemistry of plant raw material)
Languages: Russian
Types: Article
Subjects: birch bark, cork, extract, alcohol-alkaline extraction, the microwave field, березовая кора, луб, экстракт, спиртово-щелочная экстракция, СВЧ-поле
Planned experiment was done with variation of three parameters: the concentration of alcohol KOH and liquid flow module. Extraction was carried out in a microwave field.The effect of alkali consumption and the concentration of ethanol in the extract yield bast birch bark in the alcohol-alkaline treatment. It is noted that reducing the concentration of ethyl alcohol and alkali consumption increases yield of extractives (EW) increases. It is shown that the larger the alkali is used in the processing of the feedstock, the increasing its content in the solid residue formed excessive alkali content in the phloem after extraction. It has been found that the amount of free alkali in the solid phase is significantly less than in the extract. No clear relationship alkali content in the extracts from the amount of the alkali used for the experiments. Get adequate regression equations of the alkali content in the extract and a solid residue.Study the chemical composition of an alcohol-alkali bast birch bark extracts obtained after microwave extraction. A selective analysis of the obtained extracts. Standard chromatograms obtained mixture phenolic compounds and one of the extracts of the samples. Presented calibration dependence of the integral intensity of the chromatographic signal (S) the concentration c (mg / dm3) of analytes. Results of investigation of the compounds detected in the content of the extracts.
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