I have decided to use DMDM hydantoin as preservative in my shampoo.
I have to import it from china and MOQ is 50kg. On the other has Formalin is available locally and $1/kg with no MOQ. So that always makes me think if i can use formalin instead of DMDM hydantoin in shampoo.
The ingredients are: filtered water, SLES, SLS, CAPB, APG, Amodimethicone emulsion, cationic guar, NACL, EDTA 0.2%, citric acid, fragrance.
pH 4-5. Currently the pH is 4.1.
Here are my questions.a. What percentage of formalin would be a good starting point to preserve this shampoo at this pH?
b. What is the MIC or MBC of formalin for following organisms?
1. Pseudomonas aeruginosa
2. Escherichia coli
3. Burkholderia cepacia
4. Staphylococcus aureus
5. Aspergillus niger
6. Candida albicans