[labtechnician]

Hi @Bill_Toge

Thanks for your comment. Really helpful. Thank you once again

[labtechnician]

thanks everyone.. all the information was really helpful. @DavidW and @millachemist, you both are right. overtime all bubbles just disappeared.. thanks

[labtechnician]

Thanks @Perry

Actually, I  heat water phase and surfactant phase separately at approximately 70 C. First I did try to add thickener in water phase by using overhead stirrer and then add surfactant mix to water phase by using overhead stirrer. I also tried reverse method means I add thickener to surfactant mix and then mixed with water phase by using overhead stirrer. In both case, I found a lot of micro bubbles in my shampoo.

[labtechnician]

HI @DavidW..

 Sorry but you misunderstood my question? Actually My pH is around 5.5 and I want to reduce it to around 5.0 (0.5 to 0.7 reduction).

[labtechnician]

Thanks @RawMaterialGirl..

So this means I should add 50% solution at the end after complete formulation??

[labtechnician]

Thanks @MakingSkincare for such a good information..

[labtechnician]

Thanks @mikebavington

can anyone help with Benzyl Alcohol??

[labtechnician]

@The_Microbiologist Thanks a lot for your kind help. yes this preservative efficacy test was performed according to British Pharmacopoeia (5.1.3)  method. I have asked lab for data regarding separate controls and will email you asap. thanks once again.

@mikebavington.. Naticide is a blend of natural extracts formulated by SINGERA research. company says it is a fragrance that inhibits bacterial growth in cosmetic formulations. it is a good natural preservative

[labtechnician]

Time Point      S.aureurs            P.aeruginosa         C.albicans      A.brasiliensis

                        CFU/g               CFU/g                    CFU/g                CFU/g

Inoculum         7.0 x 10⁵              6.7 x 10⁵                  6.9 x 10⁵                1.7 x 10⁵

0 hour             6.8 x 10⁵             6.1 x 10⁵                  6.1 x 10⁵                1.9 x 10⁵

7 days                < 10                   < 10                        [NA]                      [NA]

14 days                 < 10                   < 10                    1.0 x 10⁵                   150

28 days                 < 10                   < 10                        < 10                       < 10                                   

                          

What is your opinion regarding this result? How I could reduce the
survival of yest (C.albicans)? Your help will be really appreciated.

thanks

[labtechnician]

@The_Microbiologist

We have just a small skin care company and started to formulate natural skin care products. At the moment, we have formulated a moisturizing cream using natural ingredients such as coconut oil, avocado oil, cucumber extracts, vitamin E, etc. We used natural preservatives Parfum (Naticide) 0.8% and Potassium Sorbate 0.7%. Formulation is very good and cream is also very good. We sent for the Preservative Efficacy test and got the following result.