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Researchers explain why blueberries are blue in colour – World News Network

Washington DC [US], February 10 (ANI): Researchers at the University of Bristol shared that blueberries’ blue colour is created by small external structures in their wax coatings.
This applies to many fruits of the same colour, such as damsons, sloes, and juniper berries.
The finding, published in Science Advances, explains why blueberries appear blue despite the dark red pigments on their skin.
Their blue colour is generated by a layer of wax that surrounds the fruit and is composed of microscopic structures that scatter blue and UV light.
This gives blueberries their blue appearance to humans and blue UV to birds. The chromatic blue-UV reflectance arises from the interaction of the randomly arranged crystal structures of the epicuticular wax with light.
Rox Middleton, Research Fellow at Bristol’s School of Biological Sciences, explained, “The blue of blueberries can’t be ‘extracted’ by squishing – because it isn’t located in the pigmented juice that can be squeezed from the fruit. That was why we knew that there must be something strange about the colour.
“So we removed the wax and re-crystallised it on the card and in doing so we were able to create a brand new blue-UV coating.”
The ultra-thin colourant is around two microns thick, and although less reflective, it’s visibly blue and reflects UV well, possibly paving the way for new colourant methods.
“It shows that nature has evolved to use a really neat trick, an ultrathin layer for an important colourant,” added Rox.
Most plants are coated in a thin layer of wax which has multiple functions, many of which scientists still don’t understand. They know that it can be very effective as a hydrophobic, self-cleaning coating, but it’s only now they realise how important the structure is for visible colouration.
Now the team plans to look at easier ways of recreating the coating and applying it. This could lead to a more sustainable, biocompatible and even edible UV and blue-reflective paint.
Furthermore, these coatings could have the same multiple functions as natural biological ones that protect plants.
Rox added, “It was really interesting to find that there was an unknown colouration mechanism right under our noses, on popular fruits that we grow and eat all the time.
“It was even more exciting to be able to reproduce that colour by harvesting the wax to make a new blue coating that no one’s seen before.
“Building all that functionality of this natural wax into artificially engineered materials is the dream!.” (ANI)


Disclaimer: This story is auto-generated from a syndicated feed of ANI; only the image & headline may have been reworked by News Services Division of World News Network Inc Ltd and Palghar News and Pune News and World News


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