Cut flowers last longer with silver nanotechnology

Aug 21, 2014

Once cut and dunked in a vase of water, flowers are susceptible to bacterial growth that shortens the length of time one has to enjoy the blooms. A few silver nanoparticles sprinkled into the water, might be the answer to longer-lasting cut flowers according to research published in the International Journal of Postharvest Technology and Innovation.

Once the stems are cut and flowers added to a vase bacteria start to colonize the open ends of the stems and block the channels through which enters. This is the main cause of a short-loved display even for the most expensive flowers, such as lilies, roses and freesias. Many florists provide a small packet of plant food with their bouquets, but this does nothing to prevent the stems becoming blocked with bacteria. Adding a drop of household bleach is perhaps a useful tip, but not all flower lovers which to have the odor of bleach in the vase spoiling the scent of their flowers.

Now, a team in the Department of Horticulture at Ferdowsi University of Mashhad, Iran, have tested nanoparticles, which are known to have antibacterial activity, in extending the blooming life of cut lilies (Lilium orientalis cv. 'Shocking'). They used suspensions of silver nanoparticles in water at levels of 5, 15, 25, 35 parts per million (ppm) and compared the floral life against controls with untreated vase water.

Seyed Hossein Nemati and colleagues found that control blooms gave a bright flora display on average for just under a week. Whereas the lower concentrations of silver nanoparticles extended this period by a couple of days. However, at 35 ppm their blooms were maintained with good color and healthy petals for almost twice as long as the controls (less than 12 days). Analysis of the stems and water revealed that at this concentration of bacterial growth was stymied for the longest period compared with controls where began within the first two days.

Explore further: Japan scientists find ageing cure - for flowers

More information: Nemati, S.H., Esfandiyari, B., Tehranifar, A., Rezaei, A. and Ashrafi, S.J. (2014) 'Effect of nano-silver particles on postharvest life of Lilium orientalis cv. 'Shocking'', Int. J. Postharvest Technology and Innovation, Vol. 4, No. 1, pp.46–53.

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User comments : 4

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dirk_bruere
not rated yet Aug 22, 2014
Silver is forever - this is potentially a big pollution problem
dollymop
not rated yet Aug 25, 2014
yes it is, we have problems already with nano particle waste dumped into water and entering the food stream.
Whydening Gyre
not rated yet Aug 25, 2014
interesting. I work with silver in my art... constantly exposed to silver "nanoparticles".
Am I gonna last longer?
Toiea
not rated yet Aug 25, 2014
It could become a problem for recycling of waste (including waste waters) by fermentation. It was already discussed here. The silver kenzans are known to prolong the life of cut flowers for many years. You can even buy a mixture of chemicals, which does the same.

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