Technical aspects
Theanine is characterised by high purity (98–102%) and low moisture content. It is a microbiologically safe product and complies with heavy metal standards.
| Parameter | Value |
| Appearance | White, crystalline powder |
| Odour and taste | Typical for plant material |
| Solubility | Soluble in water, colourless, clear solution |
| Moisture content | ≤ 0.5% |
| Ash content | ≤ 0.2% |
| pH | 5.0 – 6.0 |
| Melting point | 202–215°C |
| Chlorides | ≤ 0.02% |
| Optical rotation | +7.7 to +8.5° |
| Assay (purity) | 98% – 102% |
| Salmonella / E. coli | Absent |
| Number of microorganisms | ≤ 1000 cfu/g |
| Yeast and mould | ≤ 100 cfu/g |
| Heavy metals (Pb, Cd, Hg, As) | In accordance with the standard (As ≤ 4 ppm, Cd ≤ 1 ppm, Pb ≤ 1 ppm, Hg ≤ 0.1 ppm) |
