DPPH/ABTS radical quenching
What is DPPH/ABTS radical quenching?
DPPH/ABTS radical quenching assays measure the ability of a test material to react with stable radicals in a chemical system. Changes in absorbance provide a comparative measure of radical-scavenging capacity, not direct evidence of protection in skin cells.
Why do you need this service?
DPPH and ABTS assays compare chemical radical-scavenging capacity under defined conditions. Use them for early ingredient ranking, with biological follow-up where the question concerns protection in skin cells.
Be the first company on this service page
No published company profiles are linked to DPPH/ABTS radical quenching or its more specific services yet. Explore the service categories or add an explicitly supported capability to your company profile.
DPPH/ABTS radical quenching
DPPH and ABTS assays screen the chemical radical-scavenging capacity of cosmetic ingredients and suitable formulation samples. They are useful for comparing materials under defined conditions, but do not reproduce the full biological environment of skin.
How the assays work
The DPPH assay follows a change in the absorbance of a stable radical after reaction with a test material. The ABTS assay measures decolorisation of the ABTS radical cation. The choice of solvent and sample preparation affects which materials can be assessed, including hydrophilic or lipophilic components.
- Absorbance change relative to assay controls
- Concentration-response behaviour
- Comparison with a defined antioxidant reference
- Reaction time and solvent conditions
Sample colour, turbidity and intrinsic absorbance can interfere with readings. Appropriate blanks and consistent methods are important when comparing ingredients or formulations.
Interpreting antioxidant capacity
Reports may express activity as percentage radical quenching or a concentration required to reach a defined response. Values are method-dependent and should not be compared across incompatible protocols without qualification.
ORAC, FRAP, antioxidant enzyme measurements and cellular oxidative stress studies answer related but different questions. DPPH/ABTS results alone do not demonstrate cell survival, collagen protection, prevention of premature ageing or efficacy of a finished product in use.
Using chemical antioxidant comparisons
Keep solvent, reaction conditions and the comparison method consistent across candidate materials. Extract colour, turbidity or other direct interactions can influence absorbance, so suitable blanks and interference checks are important.
Concentration-response results can provide a comparative capacity measure within the assay. They do not establish absorption, persistence or activity in skin, and results from different methods should not be assumed interchangeable.
The findings can help select candidates for cellular oxidative-stress or damage studies. Chemical radical quenching does not demonstrate cellular defence, wrinkle reduction or a regulatory approval pathway.
Investigate antioxidant and redox responses through chemical scavenging, cellular defence and oxidative-damage assays with model-specific interpretation. Explore another Antioxidant & Redox Studies page on cosmetic-labs.com.