Peroxynitrite scavenging activity of herb extracts

Area of Science:

• Biochemistry
• Pharmacology
• Natural Products Chemistry

Background:

• Peroxynitrite (ONOO(-)) is a potent oxidant causing cellular damage, implicated in aging, lipid peroxidation, and carcinogenesis.
• Identifying natural compounds that can neutralize ONOO(-) is crucial for developing preventative and therapeutic strategies against ONOO(-)-related pathologies.

Purpose of the Study:

• To screen various herbs for constituents with peroxynitrite (ONOO(-)) scavenging activity.
• To identify the most potent herb and its active component for ONOO(-) neutralization.

Main Methods:

• A fluorometric method was employed to screen 28 different herb extracts for their ability to scavenge peroxynitrite (ONOO(-)).
• The potency of ONOO(-) scavenging activity was quantified and compared among the selected herbs.

Main Results:

• Witch hazel bark (Hamamelis virginiana L.) demonstrated the strongest peroxynitrite (ONOO(-)) scavenging activity among the 28 herbs tested.
• Other herbs showing significant activity included rosemary, jasmine tea, sage, slippery elm, black walnut leaf, Queen Anne's lace, and Linden flower.
• Hamamelitannin, the primary component of witch hazel bark, was identified as a potent ONOO(-) scavenger, exhibiting dose-dependent activity.

Conclusions:

• Witch hazel bark possesses significant peroxynitrite (ONOO(-)) scavenging properties, primarily due to its component hamamelitannin.
• Hamamelitannin shows promise as a therapeutic agent for preventing diseases associated with peroxynitrite (ONOO(-)) damage.
• Further development of hamamelitannin as a peroxynitrite (ONOO(-)) scavenger could offer new avenues for disease prevention and treatment.