Quality Control unit
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Home Business Unit&Product Information Quality Control unit Challenge Test

1. The purpose of the challenge test

The challenge test is conducted to select the type of preservative and minimum concentration of the preservative that will yield the maximum effects while assuring stability of the products during the distribution process and customer's use.

2. Testing methods

The significant reduction of bacteria is observed over time (15-30 days) after artificial injections of bacteria in the products.
Preservatives are evaluated as effective when the population of microorganisms are maintained or reduced in comparison to the day before the evaluation.
(Bacteria injected into the products are bacteria that are present in hands and air in daily lives.)

3. Bacteria used

4 species of bacteria Escherichia coli ATCC 8739 Gram negative bacterium
Pseudomonas aeruginosa ATCC 10145 Gram negative bacterium
Staphylococcus aureus ATCC 6538 Gram negative bacterium
Propionibacterium aureus ATCC 6919 Gram negative bacterium
1 species of yeast Candida albicans ATCC 10231 Yeast
1 species of fungi Aspergillus niger ATCC 6275 Mold

4. Testing process

hyaluronic acid | beauty products| hair tonic | natural cosmetics | natural beauty products | Functional medicine | natural hair shampoo | sodium hyaluronate | natural moisturizer | handmade natural soap | science cosmetics | medical cosmetics