A stilbene and dihydrochalcones with radical scavenging activities from Loiseleuria procumbens

A new dihydrochalcone, 6"-acetylphloridzosid, was isolated from the whole p lant of Loiseleuria procumbens (L.) Desv. and identified as 2'-O-(6"-O-acet ylglucopyranosyl)-4,4',6'-trihydroxydihydrochalcone by spectroscopic method s. In addition, one stilbene and three other dihydrochalcones were identifi ed as (E)-piceid, phloretin (2',4,4',6'-tetrahydroxydihydrochalcone) phlori dzosid (2'-O-glucopyranosyl-4,4',6'-trihydroxydihydrochalcone) and asebotin (2'-O-glucopyranosyl-4'-methoxy-4,6'-dihydroxydihydrochalcone), respective ly. Some of these compounds showed scavenging properties towards the 2,2-di phenyl-1-picrylhydrazyl radical and antioxidant properties in a test with l ysozyme. (C) 2000 Elsevier Science Ltd. All rights reserved.