Catalysis of the reactions: adenosine + 2 O2 = 9-riburonosyladenine + 2 hydrogen peroxide.
Source:EC:1.1.3.39,
RHEA:15489
Comment
Two other reactions might be associated with this activity: (1a) adenosine + O2 = 5'-dehydroadenosine + hydrogen peroxide, and (1b) 5'-dehydroadenosine + O2 = 9-riburonosyladenine + hydrogen peroxide.