Seasonality of Coumarin Composition and Antioxidant Activities in Daphne jejudoensis

Daphne jejudoensis, an endemic plant found in Gotjawal area in Jeju Island, was reported as a new species in 2013 due to its distinct characteristics and distribution, which differentiate it from its related species, D. kiusiana. This study focuses on the comparative phytochemical analysis and antioxidant activities of D. jejudoensis leaves based on the collection period in order to identify the optimal harvest time. Daphnin and daphnetin were identified as the major components with the highest content observed in samples collected during spring, and the highest antioxidant activities were recorded during the same time period. This study represents the first investigation into the quantitative analysis of daphnin and daphnetin in the leaves of D. jejudoensis based on the collection period.

Anti-Helicobacter pylori Compounds from Maackia amurensis

Eight isoflavonoid compounds were isolated from the EtOAc fraction of Maackia amurensis which had shown the highest anti-Helicobacter pylori activity among the fractions, using medium pressure liquid chromatography and recrystallization. Based on the spectroscopic data including 1H-NMR, 13C-NMR, HMBC and MS data, the chemical structures of the isolates were determined to be (-)-medicarpin (1), afromosin (2), formononetin (3), tectorigenin (4), prunetin (5), wistin (6), tectoridin (7) and ononin (8). Anti-H. pylori activity of each compound was evaluated with broth dilution assay. As a result, (-)-medicarpin (1), tectorigenin (4) and wistin (6) showed anti-H. pylori activity. (-)-Medicarpin (1) exhibited the most potent growth inhibitory activity against H. pylori with the minimal inhibitory concentration (MIC)90 of 25 microM, and tectorigenin (4) with MIC90 of 100 microM ranked the second. This is the first study to show the anti-H. pylori activity of M. amurensis, and it is suggested that the stem bark of M. amurensis or the EtOAc fraction or the isolated compounds can be a new natural source for the treatment of H. pylori infection.

Effect of 6% Hydroxyethyl Starch Solution on Coagulation Function in Patients with Major Burns / 대한구급학회지

BACKGROUND: Patients with major burns require replacement of intravascular volume. Hydroxyethyl starch (HES) solutions are widely used to replace intravascular volume. Dilution with crystalloids or colloids and corresponding platelet dysfunction are known causes of perioperative bleeding tendencies. The aim of the current study was to evaluate the effect of crystalloid and colloid solutions on platelet function in patients with major burns. METHODS: Forty patients scheduled for burn surgery were divided into 4 groups. The infusion was started with a Hartman solution infusion (group 1) from 7 A.M. until surgery. HES (6%, Voluven(R)) was infused in the following concentrations: 7 ml/kg (group 2), 10 ml/kg (group 3), and 15 ml/kg (group 4). The bleeding time (BT), prothrombin time (PT), prothrombin time international ratio (PT INR), activated partial thromboplastin time (aPTT), hemoglobin (Hb), platelet function analyzer-100 closing time (PFA CT), and platelet count (Plt) were measured. RESULTS: Hartmann solution and HES had no significant effect on the BT, PT, PT INR, a PTT, Hb, and Plt. The post-operative PFA CT was significantly higher in group 4 than in group 3. In group 4, the PFA CT was significantly higher post-operatively compared to pre-operatively. CONCLUSIONS: The use of high dose HES may increase the risk of bleeding tendencies in burn patients.