pH Reaction products 6.5 3'-MeQ>> 7-MeQ>> 7,3'-diMeQ 7.5 3-MeQ> 3,3′/3,4'-diMeQ>> 7,3′/7,4'-diMeQ 8.5 3'-MeQ> 3,7-diMeQ *Enzyme assays were conducted as described in the Methods section.

Table 3: Reaction products of NtOMT2 enzyme assays with quercetin as substrate under different pH’s*.