Antiviral activity and chemical composition of n-butanol extract of isatidis radix / 中草药

Objective To investigate the antiviral activity and chemical composition of n-butanol extract of Isatidis Radix. Methods Each component of total n-butanol extracts was detected by solvent and chromatogram, the anti-HSV-1 activities of each component were detected by MTT assay in vitro, each component of total n-butanol extracts was analyzed by CUPLC-Q-TOF-MS, and the data were analyzed by Markview and Excel software to find the difference among different components. According to statistics, the components related to antivirus activities were obtained. Results According to the similarity of chemical composition, 20 components were extracted and separated from n-butanol extract of Isatidis Radix by chromatography, and 10 components had antiviral activity. Forty-four chemical components were detected by UPLC-Q-TOF-MS from n-butanol extracts and their chemical structures were confirmed. Difference analysis of chemical components discovered 15 chemical components such as alkaloids, organic acids, sugars and amino acid derivatives associated with antiviral activity, especially 1-methoxy-3-carbaldehyde, 3-(3’,5’-dimethoxy- 4’-hydroxy)-2-indolinone, 1-methoxy-3-indolinone, 3-(methylsulfinyl) propylglucosinolate, and glucosamine-6-phosphatee in higher levels of the active components, which was worth further study. Conclusion The n-butanol extract of Isatidis Radix mainly contains indole alkaloids, organic acids, nucleosides and amino acids, wherein the single-indole, a sulfur glycosides and sugars and amino acid derivatives are closely related to the antiviral activity.

Zero-fluoroscopy catheter ablation for idiopathic premature ventricular contractions from the aortic sinus cusp / 南方医科大学学报

<p><b>OBJECTIVE</b>To compare the safety, feasibility, and efficacy of a completely nonfluoroscopic approach to radiofrequency catheter ablation (RFCA) using CARTO3 and ablation with conventional fluoroscopic guidance for treatment of idiopathic premature ventricular contractions from the aortic sinus cusp (ASC-PVCs).</p><p><b>METHODS</b>From April 2013 to October 2015, we prospectively enrolled 52 consecutive patients with ASC-PVCs scheduled for either CARTO3 mapping-guided zero-fluoroscopy ablation (group A, n=23) or conventional fluoroscopic ablation (group B, n=29). The success rates, rates of complications, rates of recurrences, number of radiofrequency applications, procedure time, mapping time and fluoroscopy time were compared between the 2 groups.</p><p><b>RESULTS</b>s No significant differences were found in the success rates between the 2 groups [22/23 (96%) vs 24/29 (83%), P=0.21]. No major complications occurred during the procedures in either group. There was no significant difference with regard to the procedure time between the two groups (79.6∓8.8 vs 77.4∓7.2 min, P=0.332). The procedure was completed without any fluoroscopy use in group A, while the mean fluoroscopy time in group B was 23.1∓6.0 min. Group A showed a shorter mapping time than group B (4.3∓1.7 vs 7.8∓2.6 min, P<0.01) with significantly fewer radiofrequency applications (4.8∓1.1 vs 7.9∓3.2, P<0.01). The recurrence rates were comparable between the two groups over a follow-up period of 5 to 20 months.</p><p><b>CONCLUSION</b>Compared with the conventional fluoroscopic technique, the zero-fluoroscopy approach can shorten the total procedure time and the ablation time with significantly reduced RF applications to eliminate ionizing radiation exposure in RFCA. RFCA guided by CARTO3 system without fluoroscopy is feasible, safe, and effective for treatment of ASC-PVCs.</p>

Chemical constituents in antiviral fraction of Isatidis Radix and their activities / 中草药

Objective: To study the chemical constituents in the antiviral fraction of Isatidis Radix and the activity of the monomer components. Methods: The water extract of Isatidis Radix was adsorbed by macroporous resin, and the antiviral fraction was eluted with 10% and 50% ethanol, repeatedly separated and purificated by silica gel column chromatography, reverse phase silica gel column chromatography, and Sephadex LH-20. The chemical structures were identificated using physicochemical constants and spectral data. Results: Ten compounds were isolated from the active fraction of water extract, and they were respectively identified as syringin (1), 4-(1, 2, 3-trihydroxypropyl)-2, 6-dimethoxyphenyl-1-O-β-D-glucopyranoside (2), isolariciresino (3), isolariciresinol 4-O-β-D-glucopyranoside (4), lariciresinol-4-O-β-D-glucopyranoside (5), lariciresinol-4, 4'-bis-O-β-D-glucopyranoside (6), 2-hydroxy-1, 4-benzenedi carboxylic acid (7), D-mannitol (8), indole-3-acetonitrile6-O-β-D-glucopyranoside (9), and 3-[2'-(5'-hydroxymethyl) furyl]-1(2H)-isoquinoline-7-O-β-D-glucopyranoside (10). Conclusion: Compounds 2, 4, 7, 8, and 10 are isolated from Isatidis Radix for the first time. Compound 10 has the significant effect of anti-HSV-2 virus. Therapeutic index (TI) is 6.07. Compounds 1, 5, and 6 also show some inhibition to HSV virus.

Chemical constituents from water extract of Radix isatidis / 药学学报

<p><b>AIM</b>To study the chemical constituents from water extract of Radix isatidis. (Isatis indigotica Fort. ).</p><p><b>METHODS</b>The water extract was underwent absorption by D101 macroporous resin, the portion eluted by ethanol of different concentrations was isolated and purified on silica gel column repeatedly. The obtained compounds were identified and structurally elucidated by their physico-chemical properties and spectral analysis.</p><p><b>RESULTS</b>Five compounds were isolated from water extract of Radix isatidis, and were partly identified separately: 3-[2'-(5'-hydroxymethyl) furyl] -1 (2H) -isoquinolinone-7-O-beta-D-glucoside (I), lariciresinol-4,4'-di-O-beta-D-glucopyranoside (II), lariciresinol-4-O-beta-D-glucopyranoside (III), 2-hydroxy-1, 4-benzenedicarboxylic acid (IV), mannitol (V).</p><p><b>CONCLUSION</b>Compound I is a new compound and compounds IV and V were isolated from the plant for the first time.</p>