ABSTRACT
Since the end of 2019, COVID-19 has been prevalent in Wuhan, China, and has been rapidly spreading to mainland China. Currently, more than 80,000 people have been infected, of which over 10,000 were severely ill and had characteristics of dyspnea and hypoxemia about one week after onset. Severe patients had rapidly progressed to acute respiratory distress syndrome (ARDS), causing multiple organ failures and even death, with a mortality rate of nearly 4.3%. The treatment of severe COVID-19 patients has been rarely reported. This study reported a successful example of a severe COVID-19 patient with extracorporeal membrane oxygenation (ECMO) technology in our hospital. This experience revealed that the early application of ECMO can dramatically promote the recovery of severe COVID-19 patients.
Subject(s)
Betacoronavirus , Coronavirus Infections/therapy , Extracorporeal Membrane Oxygenation , Pneumonia, Viral/therapy , COVID-19 , Humans , Male , Middle Aged , Pandemics , SARS-CoV-2 , Treatment OutcomeABSTRACT
Preliminary studies with the four extracts of Oxytropis falcate Bunge exhibited that the chloroform and ethyl acetate extracts showed stronger antibacterial activities against the nine tested Gram-positive and Gram-negative bacteria. The HPLC-scanned and bioassay-guided fractionation led to the isolation and identification of the main flavonoid compounds, i.e. rhamnocitrin, kaempferol, rhamnetin, 2',4'-dihydroxychalcone and 2',4',beta-trihydroxy-dihydrochalcon. Except 2',4',beta-trihydroxy-dihydrochalcon, four other compounds had good antibacterial activities. The minimal inhibitory concentrations (MICs) and minimal bactericidal concentrations (MBCs) of the four compounds ranged between 125 and 515 microg mL(-1). Staphylococcus aureus was the most susceptible to these compounds, with MIC and MBC values from 125 to 130 microg mL(-1). This is the first report of antibacterial activity in O. falcate Bunge. In this study, evidence to evaluate the biological functions of O. falcate Bunge is provided, which promote the rational use of this herb.
Subject(s)
Anti-Bacterial Agents , Bacteria/drug effects , Flavonoids/chemistry , Flavonoids/pharmacology , Oxytropis/chemistry , Plant Extracts/chemistry , Plant Extracts/pharmacology , Anti-Bacterial Agents/chemistry , Anti-Bacterial Agents/pharmacology , Chalcone/analogs & derivatives , Chalcone/chemistry , Chalcone/pharmacology , Chromatography, High Pressure Liquid , Kaempferols/chemistry , Kaempferols/pharmacology , Microbial Sensitivity Tests , Quercetin/analogs & derivatives , Quercetin/chemistry , Quercetin/pharmacologyABSTRACT
The antioxidant properties of the various extracts and flavonoids prepared from Oxytropis falcate Bunge were investigated by 1,1-diphenyl-2-picryldydrazyl (DPPH) radical-scavenging assay. In the chloroform, ethyl acetate and n-butanol extracts, the ethyl acetate extract exhibited the highest antioxidant activity (IC(50) = 2.05 mg mL(-1)). Furthermore, rhamnocitrin, kaempferol, rhamnetin, 2',4'-dihydroxychalcone and 2',4', beta-trihydroxy-dihydrochalcone were purified from chloroform and ethyl acetate extracts. The radical-scavenging activities of the five compounds were also measured and the results showed that kaempferol (IC(50) = 0.11 mg mL(-1)), rhamnetin (IC(50) = 0.14 mg mL(-1)) and rhamnocitrin (IC(50) = 0.15 mg mL(-1)) exhibited considerable antioxidant activities, but the antioxidant activities of the two dihydrochalcones were very weak. Although these flavonoids are known, this is the first report of antioxidant activity in this plant.
