Urease Inhibitory Kinetic Studies of Various Extracts and Pure Compounds from Cinnamomum Genus

Area of Science:

• Enzymology
• Pharmacology
• Natural Product Chemistry

Background:

• Urease enzyme catalyzes urea hydrolysis, leading to ammonia production and increased pH.
• Elevated pH is linked to various pathologies including peptic ulcers, gastric cancer, and hepatic encephalopathy.
• Urease inhibitors offer a therapeutic strategy to mitigate these urea-related diseases.

Purpose of the Study:

• To evaluate the urease inhibitory potential of Cinnamomum extracts and pure compounds.
• To investigate the mechanism of inhibition and identify key inhibitory components.
• To explore terpenes as a novel class of urease inhibitors for drug development.

Main Methods:

• Preparation and screening of seven extracts from Cinnamomum camphora and Cinnamomum verum.
• In vitro evaluation of inhibitory activity using IC50 values.
• Kinetic studies (Lineweaver-Burk plot) to determine inhibition mechanism.
• Gas Chromatography-Mass Spectroscopy (GC-MS) for chemical profiling.

Main Results:

• Methanol extract of C. camphora (IC50 = 980 µg/mL) and Camphene (IC50 = 0.147 µg/mL) exhibited significant urease inhibition.
• Competitive inhibition was observed for C. camphora methanol extract, hexane fraction, and Camphene.
• GC-MS analysis indicated the presence of various terpenes in the active hexane fraction.

Conclusions:

• Terpenes, particularly Camphene, demonstrate potent urease inhibitory activity.
• Cinnamomum species are a valuable source of natural urease inhibitors.
• These findings support the development of terpene-based therapeutics for urea-related conditions.