[hanbit]

ngarayeva001 said:

I use 60% liquid, but want to try powdered version too. I really like it but I also like carbomers and polymeric emulsifiers. Unfortunately these are not compatible with sodium lactate. If there’s one humectant that feels different (again as per my anecdotal experience) its sodium lactate. Re smell, it’s not that repulsive to me, so I kind of ignore it. Maybe I just got used to it, as it’s in the moisturizer I use everyday..

I am waiting for my sodium PCA to arrive, and yes the price difference is real. Will have to compare then. Does sodium PCA has an odor to it like sodium lactate does?

[hanbit]

emma1985 said:

hanbit said:

hanbit said:

@ngarayeva001I noticed that you’re a big fan of sodium lactate (saw you mentioned it several times in another thread). I tried adding 3% of sodium lactate to my emulsion, and it doesn’t smell great (sea salt + stale smell combined, I’m not great at describing smell though, but it is not a pleasant smell). The scent did go away after a minute or so but i’m wondering is there a way to mask of the scent without using any fragrances. What is your experiences though?

I did like the way it felt on my skin. And i tried it plain as well, and it definitely surpass glycerin and other glycols in terms of skin feel and moisture. It felt very hydrating without any tackiness (but smells awful)

Are you using powder Sodium Lactate or liquid?

I use 60% liquid as well

[hanbit]

amitvedakar said:

we use lactic acid + NaOH

For stabilising your urea cream?

[hanbit]

hanbit said:

@ngarayeva001I noticed that you’re a big fan of sodium lactate (saw you mentioned it several times in another thread). I tried adding 3% of sodium lactate to my emulsion, and it doesn’t smell great (sea salt + stale smell combined, I’m not great at describing smell though, but it is not a pleasant smell). The scent did go away after a minute or so but i’m wondering is there a way to mask of the scent without using any fragrances. What is your experiences though?

I did like the way it felt on my skin. And i tried it plain as well, and it definitely surpass glycerin and other glycols in terms of skin feel and moisture. It felt very hydrating without any tackiness (but smells awful)

[hanbit]

@ngarayeva001I noticed that you’re a big fan of sodium lactate (saw you mentioned it several times in another thread). I tried adding 3% of sodium lactate to my emulsion, and it doesn’t smell great (sea salt + stale smell combined, I’m not great at describing smell though, but it is not a pleasant smell). The scent did go away after a minute or so but i’m wondering is there a way to mask of the scent without using any fragrances. What is your experiences though?

[hanbit]

@jemolian yes i noticed that they compared it to glycerin. I’m just curious whether it is easier to formulate with compared to urea which might raise some issues in formulas. 

[hanbit]

@amitvedakar what buffer did you use to stabilise your urea cream (is it any of these : triacetin, lactate, citrate, gluconolactone)? I noticed that urea can be quite tricky to stabilise since it will degrade into ammonia and carbonic acid. I know the price difference is quite high hence i’m wondering whether hydroxyethylurea is much easier to formulate with. Based on the brochure I had (Hydrovance) hydroxyethyl urea still need buffer to stabilise and the one that they recommend is out of my reach except gluconolactone and lactate buffer. That being said gluconolactone doesn’t seem to be the best choice either, based on the graph they provided (and they didn’t provide any data for lactate buffer). I am torn and wish someone who had experienced with these materials could give some insight. 

Suggested pH Range of final formulations: 5 - 8

Some formulations may require the use of a stabilization system, to prevent the formulation from drifting to higher pH during stability testing. Potential stabilization systems include:

 Low molecular weight esters, especially triethyl citrate

 Cyclic esters or lactones

 Buffer systems, especially lactates and phosphates

HYDROVANCE moisturizing agent can be stabilized with a variety of buffer systems.

Buffer success is dependent on formulation pH. Care should be taken when selecting the appropriate buffer system and use levels, as

these will be formulation specific. The following are examples of buffer systems that have shown success in stabilizing the pH 

drift.

•Lactate Buffer

  o Blend of ammonium lactate and lactic acid

  o Useful pH range of 3.4-5.5

•Phosphate Buffer

  o Blend of disodium hydrogen phosphate and potassium dihydrogen phosphate

  o Useful pH range of 6.8-8.3