Isolation and Characterization of Neuroprotective Components from Citrus Peel and Their Application as Functional...

Area of Science:

• Neuroscience
• Gerontology
• Pharmacology

Background:

• Aging leads to neurodegeneration and cognitive decline due to factors like oxidative stress and inflammation.
• Fruit and vegetable compounds are investigated for potential health benefits, including neuroprotection.

Purpose of the Study:

• To identify and characterize neuroprotective compounds in Kawachi Bankan (Citrus kawachiensis) peel.
• To evaluate the efficacy of these compounds and citrus peel in preventing age-related cognitive dysfunction.

Main Methods:

• Isolation and characterization of 3,5,6,7,8,3',4'-heptamethoxyflavone (HMF) and auraptene (AUR) from citrus peel.
• Assessment of HMF and AUR blood-brain barrier permeability.
• Administration of K. Bankan peel powder and enriched juice to aged volunteers.
• Evaluation of cognitive function in participants.

Main Results:

• HMF and AUR isolated from K. Bankan peel demonstrated neuroprotective effects.
• Both compounds successfully crossed the blood-brain barrier.
• High auraptene content in K. Bankan peel contributed to its neuroprotective effects.
• K. Bankan juice enriched with peel paste helped prevent cognitive decline in aged individuals.

Conclusions:

• Kawachi Bankan peel contains neuroprotective compounds, HMF and AUR, which act directly in the brain.
• Dietary intake of K. Bankan peel or its enriched juice can prevent age-related cognitive dysfunction.
• This research supports the development of functional foods for brain health in the elderly.