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Nanoparticles block UV light: English ivy

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English ivy / caribb / LicenseCC-by-nc-nd - Attribution Non-commercial No Derivatives

Organic nanoparticles secreted by English ivy rootlets absorb and scatter ultraviolet light thanks to large surface-to-volume ratio and uniformity.

BIOMIMICRY TAXONOMY
Summary
"Zhang, an associate professor of biomedical engineering at the University of Tennessee, Knoxville, along with his research team and collaborators, has found that ivy nanoparticles may protect skin from UV radiation at least four times better than the metal-based sunblocks found on store shelves today

"Zhang speculated the greenery's hidden power lay within a yellowish material secreted by the ivyIt also has the ability to soak up and disperse light which is integral to sunscreens.

"'Nanoparticles exhibit unique physical and chemical properties due to large surface-to-volume ratio which allows them to absorb and scatter light,' Zhang said. 'Titanium dioxide and zinc oxide are currently used for sunscreen for the same reason, but the ivy nanoparticles are more uniform than the metal-based nanoparticles, and have unique material properties, which may help to enhance the absorption and scattering of light, and serve better as a sun-blocker.'" (EurekAlert! 2010)

Excerpt
"The concern for the biosafety and health risk for the metal-based and engineered nanoparticles in sunscreens has led to the search for alternative replacement nanoparticles. In this study, naturally occurring ivy nanoparticles were investigated to replace TiO2 and ZnO that are currently widely used in sunscreen products. Based on experimental data, we have demonstrated that ivy nanoparticles have the potential levels of UV protection necessary to warrant further investigation for uses in cosmetics. The cell toxicity of ivy nanoparticles was next tested and it was determined that ivy nanoparticles exhibited much less toxicity than widely used TiO2 nanoparticles. Without obtaining the proper marker for experimental determination, a mathematical model was used to analyze the diffusion dynamics in the human skin, especially in the SC layer. Through this analysis, we found ivy nanoparticles with a diameter of 65.3 nm will not reach the bottom of SC layer in normal conditions for short periods of time after application. The biodegradability of these ivy nanoparticles further eliminates concerns regarding environmental contamination and in the case of entry into the body. All of the above studies demonstrated that naturally occurring ivy nanoparticles could be a promising alternative for UV protection in cosmetics, especially with concerns regarding the safety of metal-based nanoparticles. With increased dangers associated with more UV passing through the atmosphere [56], the need to protect human from skin cancer elicits the need for safe and effective UV protective agents. The promising application of these ivy nanoparticles thus provides a better chance to help protect people from UV radiation." (Xia et al. 2010)
About the inspiring organism
Med_220323385_93f4e37a2f_o Hedera helix
Hedera helix Lowe

Learn more at EOL.org
Some organism data provided by: World Checklist of Selected Plant Families
Organism/taxonomy data provided by:
Species 2000 & ITIS Catalogue of Life: 2008 Annual Checklist


Bioinspired products and application ideas

Application Ideas: Replacement for metal-based nanoparticles in sunscreens.

Industrial Sector(s) interested in this strategy: Medical, cosmetics

Experts
Department of Mechanical, Aerospace and Biomedical Engineering
Mingjun Zhang
The University of Tennessee
References
Xia L; Lenaghan SC; Zhang M; Zhang Z; Li Q. 2010. Naturally occurring nanoparticles from English ivy: an alternative to metal-based nanoparticles for UV protection. Journal of Nanobiotechnology. 8(12):
Learn More at Google Scholar Google Scholar  

2010. UT researchers: English ivy may give sunblock a makeover. EurekAlert! [Internet],
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