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Antioxidant Actions of Phenolic Compounds Found in Dietary Plants on Low-Density Lipoprotein and Erythrocytes in Vitro

Department of Biochemistry
Center of Novel Functional Molecules
Department of Physiology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, CHINA

View larger version (10K): [in this window] [in a new window]   Fig. 1. Chemical structures of 6-gingerol (1), rhapontin (2), aloe-emodin (3), and barbaloin (4).

View larger version (19K): [in this window] [in a new window]   Fig. 2. The inhibitory actions of Trolox, 6-gingerol, rhapontin and barbaloin on AAPH-induced lipid peroxidation in LDL. Results are expressed as a percentage of the control. Data represent mean values ± S.D. from four independent experiments.

View larger version (18K): [in this window] [in a new window]   Fig. 3. The inhibitory actions of Trolox, 6-gingerol, rhapontin and barbaloin on hemin-induced lipid peroxidation in LDL. Results are expressed as a percentage of the control. Data represent mean values ± S.D. from four independent experiments.

View larger version (24K): [in this window] [in a new window]   Fig. 4. The inhibitory actions of Trolox, 6-gingerol, rhapontin and barbaloin on AAPH-induced hemolysis. Results are expressed as a percentage of erythrocytes lysed. Data represent mean values ± S.D. from four independent experiments.

View larger version (20K): [in this window] [in a new window]   Fig. 5. The inhibitory actions of Trolox, 6-gingerol, rhapontin and barbaloin on lipid peroxidation of erythrocyte membranes. Results are expressed as a percentage of the control. Data represent mean values ± S.D. from four independent experiments.

View larger version (21K): [in this window] [in a new window]   Fig. 6. The protective actions of barbaloin on Ca2+-ATPase activity against oxidative damage in erythrocyte membranes. Results are expressed as enzyme unit in nmol Pi/mg/min. Data represent mean values ± S.D. from four independent experiments. C: control without the test compound, T: 1 mM Trolox. Results are compared against the control with oxidative damage by one-way ANOVA followed by Dunnett's test. *, P <0.05.

View larger version (21K): [in this window] [in a new window]   Fig. 7. The protective actions of rhapontin on Na+/K+-ATPase activity against oxidative damage in erythrocyte membranes. Results are expressed as enzyme unit in nmol Pi/mg/min. Data represent mean values ± S.D. from four independent experiments. C: control without the test compound, T: 1 mM Trolox. Results are compared against the control with oxidative damage by one-way ANOVA followed by Dunnett's test. *, P <0.05; ***, P <0.001.

View larger version (25K): [in this window] [in a new window]   Fig. 8. The protective actions of barbaloin on sulfhydryl groups against oxidative damage in erythrocyte membranes. Results are expressed as nmol SH/mg protein. Data represent mean values ± S.D. from four independent experiments. C: control without the test compound, T: 1 mM Trolox. Results are compared against the control with oxidative damage by one-way ANOVA followed by Dunnett's test. *, P <0.05; ***, P <0.001.

View larger version (11K): [in this window] [in a new window]   Fig. 9. Chemical structure of peroxyl radical derived from AAPH.