As part of our search for natural antioxidants, this work presents an evaluation of antioxidant activities of methanolic extract of Oxalis corniculata and its sub-fractions in hexane, chloroform, ethyl acetate, n-butanol and water. The total phenolic contents in terms of µg of gallic acid equivalents per mg of dried mass were approximately 21.0, 28.2, 34.5, 162.0, 70.0, and 49.2 in methanolic, ...

Based on starch-iodine agar plate, a novel screening method that can be used to screen for β-lactamase inhibitors from extracts of herbs is established. The extracts of 100 traditional Chinese medicines were screened for βlactamase inhibitors by this method. The inhibition rates of the Rheum palmatum L., Schisandra chinensis (Turcz.) Baill., Hypericum japonicum Thunb., Paederia scandens (Lour.)...