Testing Item

Standard

Character

Yellow to Orange-yellow free flowing particle

Identification positive

Must comply

Particle size

Sieve 90% pass through

0.28mm normal sieve

Loss on drying

≤3.0%

Residue on ignition

≤5%

Volatilizable impurity of

Organic

Must comply

Assay (on dry material)  

77.8-84.0%

Conclusion:  According to <Feed additive-Riboflavin flowing particle> GB/T

                  18632-2002 assay conforms.