Efficacy and Duration Testing Methods for Deodorant Powder

To test the efficacy of a deodorant powder and determine how many hours it can protect against body odor, you can use several methods ranging from laboratory analysis to human panel testing.

1. Laboratory Testing (In-vitro)

This method measures the chemical ability of your powder to neutralize or suppress odor-causing substances.

• Organoleptic Evaluation of Deodorizing Efficacy (Acidic Model): This test evaluates how well your product suppresses Isovaleric Acid, which is a primary chemical marker for armpit and foot odor. It provides a scientific basis for "deodorizing" claims.
• Deodorization Efficacy Test (Ammonia Gas Reduction Assay): This measures the product's ability to neutralize ammonia gas, which is another component of body odor.

2. Human Panel Testing (In-vivo / Sniff Test)

To claim a specific number of hours (e.g., "24-hour protection"), a human panel test is required. This is the industry standard for duration claims.

• Protocol: A group of volunteers (panelists) applies the product to one armpit, while the other remains untreated (control).
• Evaluation: Trained "odor judges" sniff the armpits at specific intervals (e.g., 4, 8, 12, and 24 hours) and score the intensity of the odor on a scale (usually 0-10).
• Result: If the treated side shows a statistically significant reduction in odor compared to the control at the 24-hour mark, you can claim 24-hour protection.

3. Internal R&D Testing (Simple Method)

For initial development, you can conduct a simplified internal test:

1. Standardization: Ask volunteers to use a fragrance-free soap for 3-5 days before the test to clear any residue from other products.
2. Application: Apply a measured amount of the powder to one armpit.
3. Self-Assessment: Have the volunteers record the odor level every 2-4 hours throughout the day.
4. Activity Level: Ensure volunteers perform similar daily activities to keep the sweat levels consistent.

If you are looking for professional lab verification of the deodorizing mechanism, the Organoleptic Evaluation (Acidic Model) and Ammonia Gas Reduction Assay are highly recommended to confirm the chemical efficacy of your formula.