Abstract
Methanol extracts of elm (Ulmus davidiana Planch) root bark were fractionated and purified to obtain active antiphotooxidative compounds against methylene blue sensitized photooxidation of oil. Crude extracts of elm root bark exhibited a strong protective activity, comparable to α-tocopherol, against methylene blue sensitized photooxidation of oil. Butanol and ethylacetate fractions of crude extracts showed strong antiphotooxidative activities. Four isolated pure compounds were obtained and positively identified as catechin-7-O-d-xylopyranoside (CXP), catechin-7-O-d-apiofuranosid (CAF), catechin (C), and mansonone E. CXP, CAF, and C were identified as active compounds showing strong protective activities against methylene blue sensitized photooxidation. However, mansonone E at a 300 ppm concentration induced a 20% increase in hydroperoxide formation. These 3 compounds are major active compounds for the antiphotooxidative activities of elm root bark extracts against methylene blue sensitized photooxidation of oils.
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