The Preservative Efficacy Challenge Test (PECT), also known as the challenge test, is an important procedure in the cosmetic industry. This test verifies whether a product’s preservative system is effective enough to prevent microbial contamination throughout its period of use. This is of particular importance for products that contain water because they are more susceptible to microbial growth.
What does the challenge test entail?
The challenge test is designed to expose the product to controlled amounts of microorganisms, such as bacteria, fungi and yeasts. The objective is to evaluate the ability of the preservation system to inhibit or kill these microorganisms. This test is conducted under strictly controlled laboratory conditions.
The importance of the challenge test
The challenge test is necessary for several reasons:
- Guarantee of product safety: An effective preservation system prevents microbial contamination, which can lead to health risks for users.
- Legal requirements: In the European Union and many other regions, it is mandatory to demonstrate the microbiological safety of a product as part of the Cosmetic Product Safety Report (CPSR).
- Consumer Experience: A product that is microbiologically stable retains its quality and function throughout the shelf life.
How is the test conducted?
1. Inoculation with microorganisms
The product is injected with a mix of selected microorganisms commonly found in contaminated products, such as Staphylococcus aureus, Escherichia coli, and Candida albicans.
2. Incubation period
The samples are kept at a controlled temperature for a certain period of time. During this period, samples are taken periodically to measure the number of surviving microorganisms.
3. Evaluation of results
The decrease in microbial count is analyzed and compared to the criteria for effectiveness. A successful preservation system will show a significant decrease in microbial growth within a predetermined time period.
What happens after the test?
If the preservation system proves ineffective, the formulation can be modified by changing the type or concentration of preservatives. The product is then retested until it meets the requirements for microbiological safety.
How do you prepare your sample?
Required amount of sample: 200 g/ml
The amount of sample to be prepared for this test is 200 g / ml. Send the samples in the original packaging of your products as they are offered for sale. If this is not possible, send your bulk products immediately after production by packing them in a tightly sealed and uncontaminated container.
After purchasing this test, we will send you all the instructions you need and where to send the samples.
How long will the test take?
Duration of the test: 35 days
Estimated delivery time report: 45-50 days
How do I get the results?
You will receive an email when the test results are ready.
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