Fig. 1. Effect of MIXEE on DPPH radical Scavenging activity and reducing power. (A) Scavenging activity of MIXEE on DPPH radical. Vitamin C (Vit C) at 100 μg/ml was used as a positive control. (B) Reducing power of MIXEE. Vitamin C (Vit C) at 10 μg/ml was used as a positive control. Data are given as means of values ± SD from three independent experiments. Level of significance was identified statistically (* p<0.05, ** p<0.01, *** p< 0.001) using Student’s t test.
Fig. 2. Effect of MIXEE on tyrosinase activity and melanin synthesis in vitro. (A) Effect of MIXEE on tyrosinase activity. (B) Effect of MIXEE on melanin synthesis. Vitamin C at 1,000 μg/ml was used as a negative control in these experiments. Data are given as means of values ± S.D. from three independent experiments. Level of significance was identified statistically (* p<0.05, ** p<0.01, *** p<0.001) using Student’s t test.
Fig. 3. Effect of MIXEE on viability in B16F1 cells. The cells were treated with MIXEE at 1, 2, 4, 8, 16, 32 and 64 μg/ml. Cell viability was determined by MTT assay after 24 hr of incuvation. Data are given as means of values ± S.D. from three independent experiments. Level of significance was identified satistically (** p<0.01) using Student’s t test.
Fig. 4. Scavenging effect of MIXEE on intracellular H2O2. B16F1 cells were loaded with 20 μM DCFH-DA for 20 minutes. The cells were pre-treated with MIXEE at concentrations indicated for 1 hr, and were exposed to H2O2 in HBSS buffer for 1 hr. The fluorescence intensities were measured with 488 nm and 530 nm of excitation and emission frequencies, respectively. Level of significance was identified statistically (** p<0.01, *** p<0.001) using Student’s t test.
Fig. 5. Effect of MIXEE on melanin production in B16F1 treated without or with 250 μM H2O2. (A) The amount of itracellular melanine were analyzed in B16F1 cells treated with MIXEE. (B) The amount of itracellular melanine were analyzed in B16F1 cells treated with MIXEE after H2O2 stimulation. Vit.C 1,000 μg/ml was used as a positive control. In these experiments Data are given as means of values ± S.D. from three independent experiments. Level of significance was identified statistically (** p< 0.01, *** p<0.001) using Student’s t test.
Fig. 6. Effect of MIXEE on protein expressions of SOD-2, SODD-3, catalase in B16F1 cells. The cells were treated with MIXEE at 4, 8 and 16 μg/ml. Western blot analysis of cell lysates was performed using antibodies as indicated. The expression of β-actin was used as a control for normalization of target proteins. Level of significance was identified statistically (* p<0.05, ** p<0.01, *** p<0.001) using Student’s t test
Fig. 7. Effect of MIXEE on protein expressions of TRP-1, TRP-2, tyrosinase in B16F1 cells. The cells were treated with MIXEE at 4, 8, 16 and 32 μg/ml. Western blot analysis of cell lysates was performed using antibodies as indicated. The expression of β-actin was used as a control for normalization of target proteins. Level of significance was identified statistically (* p<0.05) using Student’s t test.
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