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Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield
Published on: January 7, 2019
Neolignans and glycosides from the stem bark of Illicium difengpi
Lei Fang1, Dan Du, Guang-Zhi Ding
1Key Laboratory of Bioactive Substance and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 1 Xian Nong Tan Street, Beijing 100050, People's Republic of China.
Abstract:
Five new neolignans (1-4 and 9), two pairs of neolignan epimers (5-8), and two new aromatic glycosides (10 and 11) have been isolated from the stem bark of Illicium difengpi. Their structures were determined by spectroscopic methods, including 1D and 2D NMR, HRESIMS, CD experiments, and chemical methods. The absolute configurations of the 3,4-diol moiety in 1 and 1,3-diol moiety in 2 were confirmed by Snatzke's method, observing the induced circular dichroism after addition of dimolybdenum tetraacetate in DMSO. Compounds 3, 4, and 11 exhibited moderate anti-inflammatory activities with IC(50) values ranging from 1.62 to 24.4 microM, while compound 3 displayed antioxidant activity with an IC(50) value of 42.3 microM.
