Antioxidant activity of inclusion complexes of tea catechins with beta-cyclodextrins by ORAC assays

作者：Folch Cano C; Jullian C; Speisky H; Olea Azar C^*

来源：Food Research International, 2010, 43(8): 2039-2044.

DOI：10.1016/j.foodres.2010.06.006

• Antioxidants
• Tea catechins
• ORAC FL
• ORAC PGR
• beta cyclodextrins

Inclusion complexes of native and two derivatizated beta-cyclodextrins with some tea catechins (TCs) like catechin (C) epigallocatechin gallate (EGCG) and gallocatechin gallate (GCG) The stoichiometry of TC complexes was determined and in all cases was 1 1 Stability constants were determined and their antioxidant capacity against reactive oxygen species (ROS) studied by means of the ORAC-fluorescein (ORAC-FL) and the ORAC pyrogallol red (ORAC-PGR) assay The antioxidant capacity of these TC in aqueous solution in the absence and presence of beta CDs was studied using Multi-Detection Microplate Reader The antioxidant reactivity mainly depends of the inclusion modes of the TC in the beta CDs cavity The difference between ORAC-PGR values for the same TC show that the

• 出版日期2010-10