Phenolic constituents from Wikstroemia chamaedaphne / 中国中药杂志

The phenolic constituents of Wikstroemia chamaedaphne were investigated by various column chromatographic methods including silica gel,Sephadex LH-20,ODS and preparative HPLC,and their chemical structures were identified by physico-chemical properties and spectral analyses. Thirteen phenolic compounds were isolated and elucidated,including five flavonoids: luteolin 7-O-β-D-glucopyranoside(1),luteolin 4'-O-β-D-glucopyranoside(2),kaempferol 3-O-β-D-glucopyranoside(3),chrysoeriol 4'-O-β-D-glucopyranoside(4),chrysoeriol(5); and eight lignans:(-)-secoisolariciresinol(6),acanthosessilin A(7),(-)-nortrachelogenin(8),(+)-isolariciresinol(9),sesamin(10),syringaresinol(11),(+)-epipinoresinol(12),and [3,3',4,4'-tetrahydro-6,6'-dimethoxy-3,3'-bi-2 H-benzopyran]-4,4'-diol(13). Compounds 1, 3, 5-8, 10, 11 and 13 were obtained from the plants of W. chamaedaphne for the first time,and compounds 1,5,7,10 and 13 were obtained from the Wikstroemia genus for the first time.

Chemical constituents from flowers of Wikstroemia chamaedaphne and their anti-hepatitis B virus activity / 中草药

Objective: To study the anti-hepatitis B virus diterpenoids from flowers of Wikstroemia chamaedaphne. Methods: The chemical constituents of the plant were isolated and purified by column chromatography and their structures were elucidated on the basis of physicochemical properties, X-ray, and spectral data. The antivirus assay was tested by MTT and ELISA methods. Results: Six daphnane-type diterpenoids and one tigliane-type diterpenoid were obtained and determined as simplexin (1), pimelotide A (2), pimelotide C (3), wikstroelide E (4), pimelea factor S6 (5), pimelea factor S7 (6), and 6α,7α-epoxy-5β-hydroxy-12-deoxyphorbol-13-decanoate (7), along with two flavonoid glycosides luteolin-4'-O-β-D-glucoside (8) and isoquercitrin (9). Compounds 1-4 and 7 showed certain cytotoxicity on HepG2.2.15 and compound 3 exhibited strong anti-hepatitis B virus activities with IC50 value of 0.016 μg/mL against HBV surface antigen (HBsAg), with TI (Therapeutic Index) value of 355.63. Conclusion: Compounds 7 and 8 are isolated from the genus for the first time. And it is the first time to report the X-ray structure of compound 2 and the anti-hepatitis B virus activity of compound 3 (pimelotide C).

Morphological and microscopical identification of Genkwa Ramulus and its adulterants / 中国中药杂志

The purpose of this article is to identify Daphne genkwa and its adulterants, Wikstroemia chamaedaphne, according to the morphological and microstructure characteristics of their stem and foliage. The root of D.genkwa was studied simultaneously. The results indicated that the crude drug and processed pieces of Genkwa Ramulus were mainly composed of stems and branches where obvious opposite petiole scars and branch marks were able to be seen on their nodes. Otherwise, foliage or peduncles generally couldn't be found. Moreover, the fine silver flocculent fibers could be observed in the bark of fracture surface. The adulterants were the plant segments which were composed of stems, foliage and peduncles with spikelet-pedicel scars. There existed microstructures differences between Genkwa Ramulus and its adulterants. In the former, single thick lignified phloem fibers were interspersed in the stem phloem of the transverse section with very thick wall and unicellular non-glandular hairs could be observed on the lower epidermis of foliage. Nevertheless, in the latter, there was no thick lignified phloem fibers in cross section of stem phloem, the outer wall of epidermal cells of foliage hadthick cuticles and no non-glandular hairs in lower epidermis of foliage. The results can be used for the identification and the quality standard of the crude drug and processed pieces of D.genkwa.The characteristics of the microstructures and the transverse section can be used to identify the radix D.genkwa.