Patent ID: 8563072

Claim:
A stable suspension of colloidal silicic acid nanoparticles having a pH lower than 0.9, a molar silicon concentration between 0.035 and 0.65, a free water concentration of at least 30% (w/v) and a ratio between hydronium ion and Si molar concentrations higher than 2, wherein said nanoparticles are soluble in water, more than 98% of the suspension passes through a 0.1 micron filter but is not filterable on a MW 20.000 filter, and 29 Si NMR for the suspension shows a typical colloidal silica spectrum with a separated low Q2 peak further supplemented with at least one of the following: i—micro- and macro nutrients ii—growth activators, fertilizers, biological active compounds for crop production and protection; iii—hydrophilic and hydrophobic anti-oxidants iv—enzyme inhibitors, hormones, antibiotics, or other pharmaceuticals; or v—natural and synthetic food colorants, food sweeteners, food emulgators and food flavourings; or mixtures thereof.