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. Author manuscript; available in PMC: 2009 Oct 1.
Published in final edited form as: J Cell Biochem. 2008 Oct 1;105(2):514–523. doi: 10.1002/jcb.21853

Table 2.

Inhibition of 20S proteasome activity by unmethylated and methylated flavonoids

Flavonoid IC50 (μM)
Apigenin 1.8 (± 0.03)§
MeApi >50
Luteolin 1.5 (± 0.01)
MeLut >50
Quercetin 3.5 (± 0.05)§
MeQuer >50
Chrysin 4.9 (± 0.15)
MeChry >50

Results were obtained from 3 independent experiments performed in triplicate.