Juanse said:
They wanted to prove that manuka was more active than other honeys because
of this methylglyoxal, therefore they put catalase for inhibiting the H2O2
factor when doing the petri dish tests.

As glucose oxidase is provided by Apis, catalase comes with pollen.

In my final work in Food Chemist I found no activity of catalase in honeys 
from Prosopis (flexuosa mainly) in Córdoba (dry area and dries honeys) and 
high activity of catalase in honeys from Eucalyptus (saligna) and Baccharis 
(salicifolia, dracunculifolia and others) in high moisture areas.

Maybe because very low air moisture, always below 30% during Prosopis 
blossom (end of October to November), Apis do not need to work to much. 
Therefore less trophallaxis ("trofalaxia" in Spanish) and less presence of 
glucose oxidase but with very good antibacterial activity in the absence of 
calatase.

Fernando
Córdoba, Argentina

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