Reconciling IU/g and mass fraction in a vitamin E premix

Set up the comparison

Confirm the chemical and stereochemical form before converting between mass fraction and IU/g. Request the supplier’s potency conversion and compare samples before and after pelleting by the same method.

Measurements to record

Vitamin E acetate (%). This example uses GC with a reference standard. It does not establish values for other oil preparations or carriers. Loss on drying (%). Compare like forms and check handling requirements after opening. Record the sample ID and method revision for repeat testing.

Interpreting the results

Ask whether the grade number 50 describes a mass percentage or a potency claim. Specify the agreed unit and analytical method in the contract.

What to record

• Active form
• Mass fraction
• IU/g
• Conversion basis
• Pelleting conditions

Technical references

• BASF: Lutavit E 50 feed-grade powder technical information ↗

Products and processes