I have IC got IC 50 value. From this how can I calculate antioxidant activity or capacity?

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Abdelhak Maghchiche

To calculate antioxidant activity from an IC50 value, use the radical scavenging activity (RSA) formula to determine the percentage inhibition of free radicals. The IC50 value indicates the concentration needed to scavenge 50% of radicals, providing a measure of antioxidant potency.

Resmi Paul

What is the formula to calculate RSA

Yurii V Geletii

The absolute values of antioxidant activity and capacity don't exist. These values are measured relatively to a standard antioxidant, commonly ascorbic acid or Trolox. Practically, you have to determine IC50 for a standard antioxidant and the ratios of your IC50/IC50(st) are your values. Surely, these values are different for different antioxidant tests.

Thank you all for the valuable advice