Free radical scavenging activity of ethanolic extracts of 26 Venezuelan Amazon plants

AGFD 95

Maria del C. Rodriguez, mcrodrig@ciens.ucv.ve1, Masahisa Hasegawa1, and Jimmy Castillo, jimmy@ciens.ucv.ve2. (1) Facultad de Ciencias, Universidad Central de Venezuela, Escuela de Química, Los Chaguaramos, Caracas, 47102, Venezuela, (2) Escuela de Química, Universidad Central de Venezuela, Laboratorio de Espectroscopía Laser, Escuela de Química Facultad de Ciencias, 47102, Caracas, 1020a, Venezuela
Recently, there has been growing interest in natural antioxidants of plant origin because they have greater application in the food industry or aging prevention. Accumulated evidence suggests that the oxidative damage by radicals in diabetes complications can be scavenged through chemoprevention utilizing natural antioxidant compounds present in foods and medicinal plants. The free radical scavenging capacity (RSC) of antioxidants from ethanolic extract of 26 Venezuelan Amazon plants were studied using the 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) using a second order kinetic model. The second order rate constant (k2) was calculated for the quenching reaction of the substrate with the DPPH radical. These constants reflect the effectivity of the test materials. Values obtained were compared with reference compounds like tocopherol. k2 values ranging from 1 to 6x10-5 were obtained, and high free radical scavenging activity for some of the extracts was found.
 

General Posters
1:00 PM-3:00 PM, Monday, 11 September 2006 Moscone Center -- Hall D, Poster

Division of Agricultural & Food Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006