Тип публикации: статья из журнала
Год издания: 2021
Идентификатор DOI: 10.1134/S1068162021070098
Ключевые слова: pine bark, water, water-ethanol solutions, extraction, proanthocyanidins, composition, procyanidins, prodelphinidins, water–ethanol solutions
Аннотация: The isolation of proanthocyanidins from the bark of Scotch pine Pinus sylvestris L. by water and water-alcohol solutions containing 5, 10, 15, 20, and 25% ethanol was studied for the first time. Isolation of proanthocyanidins was carried out from the initial and deresined (extracted with hexane) pine bark. It was shown that, comparПоказать полностьюed with water extraction, the use of 15-25% aqueous ethanol solutions allows one to increase the yield of proanthocyanidins from 0.44 to 0.63%. It was established that the preliminary extraction of resinous substances from the pine bark does not significantly affect the yield of proanthocyanidins. It was shown that an increase in ethanol concentration of more than 20% in the extraction solution leads to an increase in the total yield of extractives, while the yield of proanthocyanidins does not increase. A study of proanthocyanidins by UV spectroscopy after their conversion to red anthocyanidins showed that they mainly consist of procyanidin and prodelphinidine in close concentrations. The composition of the proanthocyanidins mixtures obtained was studied by IR and C-13 NMR spectroscopy. It was shown that the proanthocyanidins obtained from the bark of pine Pinus sylvestris L., in contrast to isolated from other pine species, contains gallic acid residues which can increase their antiradical activity.
Журнал: RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY
Выпуск журнала: Vol. 47, Is. 7
Номера страниц: 1445-1450
ISSN журнала: 10681620
Место издания: NEW YORK
Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER