Orange-yellow crystalline powder, slightly odorous, slightly bitter; easily soluble in dilute alkali solution, the saturated solution becomes neutral, fluorescent light yellow-green, the dry product is not affected by light, but the liquid can deteriorate under light and is acidic It is stable under alkaline conditions and decomposes rapidly under alkaline conditions.
VB2 can be used as a food nutritional enhancer and colorant with strong coloring ability.The two forms allowed for addition to food are riboflavin and 5-phosphate-riboflavin. The former is mainly used for nutritional enhancement of cereals, pasta and health foods, or for coloring light-proof foods; the latter is most commonly sodium salt, which is mainly used for the fortification of ready-to-eat dry powdered prepared foods, and for coloring light-proof foods. In particular, people who do not often eat meat and dairy products, people with arteriosclerosis, patients with chronic hepatitis and people who lose weight are in urgent need of supplementation.
| Item | Index | Item | Index |
| Content% | 98.0-102.0 | Specific rotation[α]D20 | -120°~-140° |
| Loss on drying % | ≤1.5 | Burning residue % | ≤0.3 |
| Heavy metals（Pb）/mg/kg | ≤10 | Absorbance of photoflavin % | ≤0.025 |
| （As）mg/kg | ≤2 | / | / |
