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Hippo Sweat May Help To Develop Natural Sunscreens In Future
"It would be nice to also try and replicate the antiseptic and insect-repellent characteristics of the sweat, to obtain a four-in-one product: sunscreen, sunblock, antiseptic, insect repellent," co-author Christopher Viney told Discovery News.
He and colleagues Emily Reed, Lisa Klumb and Maxwell Koobatian had staff at Fresno's Chaffee Zoo retrieve the oily secretion from an indoor enclosure where the zoo's hippos had rested.
The sweat was transferred to sealed plastic containers.
Even after several months of storage, the red sweat showed no signs of yeast, bacteria or fungal contamination.
Microscopic analysis of the sweat revealed that it contained two types of liquid crystalline structures: banded and non-banded.
Viney explained that the banded structures are "characterized by concentric dark rings" when viewed under certain magnification.
"The rings are the result of a structural periodicity that occurs on a scale comparable to the wavelengths of visible light," he said. "This means that the sweat is an effective scatterer of light, so that it combines both sun-blocking and sun-screening properties," he added.
The non-banded structures, in turn, "enhance the ability of the sweat to spread over the surface of the animal, by reducing the viscosity of the sweat."
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