Antioxidant and Antimicrobial Activities of Larrea Divaricata Cav. Aqueous Extract on Vitamin C from Natural Orange Juice

Abstract

Larrea divaricata Cav. is a South American plant widely distributed in Argentina with reported antioxidant and antimicrobial<br />activities. Vitamin C (Vit C) the most important water-soluble antioxidant, is degraded upon factors such as<br />oxygen, heat, light, storage time and temperature, during cooking and in presence of microorganisms. The aim of this<br />work was: to study the antioxidant and antimicrobial activity of an aqueous extract of L. divaricata (E) on Vit C prepared<br />in water and on Vit C from natural orange juice, submitted to different store conditions such as temperatures and<br />oxygen. The antioxidant activity was determined by DPPH method and used to obtained the relative Vit C concentration;<br />Vit C decreased its activity and concentration under temperature and air oxygen, but E allowed Vit C to recover<br />its antioxidant activity and prevented Vit C microorganism contamination. These studies were performed in view to establish<br />whether L. divaricata can be used as a supplement on orange juices capable to prevent Vit C decay and microbial<br />growth.