TITLE:
Antioxidant and Antimicrobial Activities of Larrea Divaricata Cav. Aqueous Extract on Vitamin C from Natural Orange Juice
AUTHORS:
Patricia Micucci, Maria Rosario Alonso, Sebastian Turner, Roberto Davicino, Claudia Anesini
KEYWORDS:
Vitamin C, Larrea Divaricata Cav., Antioxidant Activity, Antimicrobial Activity
JOURNAL NAME:
Food and Nutrition Sciences,
Vol.2 No.1,
January
24,
2011
ABSTRACT: Larrea divaricata Cav. is a South American plant widely distributed in Argentina with reported antioxidant and antim- icrobial activities. Vitamin C (Vit C) the most important water-soluble antioxidant, is degraded upon factors such as oxygen, heat, light, storage time and temperature, during cooking and in presence of microorganisms. The aim of this work was: to study the antioxidant and antimicrobial activity of an aqueous extract of L. divaricata (E) on Vit C pre- pared in water and on Vit C from natural orange juice, submitted to different store conditions such as temperatures and oxygen. The antioxidant activity was determined by DPPH method and used to obtained the relative Vit C concentra- tion; Vit C decreased its activity and concentration under temperature and air oxygen, but E allowed Vit C to recover its antioxidant activity and prevented Vit C microorganism contamination. These studies were performed in view to es- tablish whether L. divaricata can be used as a supplement on orange juices capable to prevent Vit C decay and micro- bial growth.