Nano Silver-Zinc for Post-Harvest and Horticulture

ZnoNova Materials

Post-harvest losses are mostly microbial. So are most of the reasons a cut flower stops drinking. Both problems attract metal-ion antimicrobials, and both sit in regulatory territory where the honest answer to “can we use this” is often “not without work that we cannot do for you”.

The two applications, which are not equally straightforward

Cut flowers and potted plants	Vase-solution and external treatment. No food contact, which removes the hardest regulatory question and is why this is the more accessible of the two. Bacterial blockage of the stem's vascular tissue is a well-understood cause of early wilting.
Fresh produce	Anything applied to produce destined for consumption raises residue and food-contact questions that are market-specific and non-trivial. This is not a case where a supplier datasheet settles anything.

The material

Composition	Nano Ag 1,200 ± 50 ppm + nano ZnO 15,000 ± 200 ppm, waterborne
Particle size	5–10 nm, spherical, BET >200 m²/g
Dosage	0.5–1%, diluted with deionised or boiled-and-cooled water
pH / odour	7 ± 1 · odourless
Compliance	RoHS — free of Cd, Pb, Hg, Cr(VI), PBB, PBDE

Dilute with deionised water. Chloride in tap water precipitates silver, which both removes the active and can leave visible residue on petals or produce surfaces.

What we will not do

We will not tell you it is approved for produce in your market. It is supplied as a functional additive. Plant-protection, biocidal and food-residue frameworks all differ by country, and the assessment is the user's.
We do not hold a food-contact or residue dossier for this use. If your application touches edible produce, treat that as the first question to resolve rather than the last.
We do not claim a shelf-life extension figure. Shelf life depends on the crop, the harvest condition, the cold chain and the packaging. A number from a different crop in a different chain would be worse than no number.
The 99.9% SGS results are the manufacturer's, on their own test system. Efficacy on your crop, at your dilution, must be established on your crop.

Where to start if you are serious

Start with cut flowersNo food-contact question, quick to trial, and the mechanism is well established.

Define the organismBacterial stem blockage and post-harvest fungal rots are different targets with different answers.

Resolve regulation before scalingNot after a successful trial, when a commercial commitment is already implied.

Test dilution waterHard or chlorinated water will visibly change the result.

Questions buyers ask

Can we spray this on fruit and vegetables for sale?

That depends entirely on your market's residue and plant-protection rules, and it is your assessment to make. We supply the material as a functional additive and do not hold a residue dossier for edible produce.

Does it extend vase life?

Bacterial blockage of the stem is a recognised cause of early wilting, so an antibacterial vase treatment has a clear mechanism. We do not publish a days-of-vase-life figure because it depends on the species, harvest stage and handling.

What dilution should we use?

0.5-1% of the concentrate, in deionised or boiled-and-cooled water. Establish the working level on your crop.

Will it mark petals or fruit surfaces?

Silver precipitated by chloride can leave visible residue, which is the main reason we insist on deionised water for dilution.

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