抄録
1) A substance has been isolated from castor-seeds, which controls the reversible action of lipase.
It has three forms, the reduced, the intermediary and the oxidised.
2) The reduced form of this substance, which seems to be the predominating form in castor bean-seeds, acts as an activator on the hydrolytic reaction of the ricinus-lipase and as an inhibitor on the synthetic reaction.
3) The oxidised form, which is easily obtainable from the reduced form by the auto-oxidation in air acts as an activator for the synthesis and as an inhibitor for the hydrolysis.
4) The intermediary form is indifferent for both synthetic and hydrolytic reaction.
Investigation on this substance will be continued.
The author is greatly indebted to Prof. Dr. K. Kodama for his kind criticisms and suggestions throughout this research.
