ABSTRACT
Objective To study the non-iridoid constituents from the roots of Gentiana straminea.Methods The compounds were repeatedly separated and purified on column chromatography of silica gel,Sephadex LH-20,and ODS,and their structures were identified on the basis of spectral and chemical methods.Results Twelve compounds were isolated from 70% ethanol extract of G.straminea and were identified as(-)-syringaresinol-4,4′-bis-?-O-D-glucopyranoside(1),gentiaphyllide-D(2),erythrecentaurin(3),macrophyiioside D(4),gentiaphyllide-E(5),roburic acid(6),uvaol(7),?-sitosterol(8),daucosterol(9),gentianose(10),?-glucose(11),and ?-glucose(12),respectively.Conclusion Compounds 1-6 and 10 are isolated from this plant for the first time.
ABSTRACT
To study the clinical feature and surgical outcome of subretina and vitreous hemorrhage associated with senile macular degeneration (SMD). Vitrectomy was performed in 29 eyes of 29 patients with subretina and vitreous hemorrhage associated with SMD. Changes in the retina were observed, and the results of surgery were analyzed. The results showed that there was submacular hemorrhage in 16 patients, in whom 4 showed periomacular subretinal hematoma. There was peri macular subretinal hematoma only in 13 cases. The pathological changes in the macular region included discoid degeneration, submacular neovascularization, fixed foldings, exudation, scar and atrophic discoid cicatrization. All patients got visual acuity improvement after surgery. However those patients who had subretinal hemorrhage got less improvement of visual acuity than the others. It suggested that the SMD patients who was complicated by subretinal hemorrhage had a severer macular lesion. Pars plana vitrectomy could restore central vision of patients who suffered from subretinal and vitreous hemorrhage. But the outcome was related with the position of subretinal hemorrhage.