Members Directory - Chemists Corner

rosa

Member

August 21, 2015 at 5:46 pm in reply to: creams separating

I have heard that xanthan gum does not go with BTMS as both are cationic, is this true?

I also thought olivem is a strong stand-alone emulsifier? So it really need co-stabilizers?

I never used glyceryl stearate, but is seems to be a good product?

The fact that the cream curdles immediately when combining the phases, doesn’t that really mean that something doesn’t really go together in there?

Thanks a lot!

Rosa

rosa

Member

August 21, 2015 at 4:27 pm in reply to: creams separating

Hi, yes I do stir continuously down to 40-45 degrees. At ~50 degrees the creams is really thick, so thick/viscous so it is impossible to stir with emulsifier. Instead I have to use a hand whisk. And later on (usually when adding additives around 40 degrees), a bit of thinning occur (not a huge amount). Then for some reason, it becomes thinner/unstable.

What is really happening with the cream. Could it still be a technique issue?

I do realize I have to do test batches and eliminate one by one ingredients, but really want to narrow it down a bit first!

Thanks a lot for the help David and MarkBroussard

rosa

Member

April 19, 2015 at 8:36 am in reply to: Problem with face wash separating

would carbomer be anything like HEC and could it be useful?

rosa

Member

April 19, 2015 at 7:50 am in reply to: Problem with face wash separating

So the added 1% of cetyl alcohol might make all the difference?

Thanks!

rosa

Member

April 19, 2015 at 7:25 am in reply to: Problem with face wash separating

Hi and thanks so much for helping! I really thing that the oils in the wash cream is making it nice as the skin doesn’t go dry from using it, so would like to keep it if possible?

So it is possible to replace some of the oils with cetyl alcohol or HEC? About how much would be good and which one would be the better one for this formulation?

Should I also use more BTMS? Or another emulsifier? Would it not be too thich with more emulsifier (has to be pumpable)?

Thanks again!

rosa

Member

April 18, 2015 at 8:40 pm in reply to: Problem with face wash separating

Hi and thanks a lot for your reply! Do you mean too low concentration or should I use a co-emulsifier? In that case, which one would be good? Also, could the problem be that I am using hydrolyzed wheat ptotein, which carry a plus charge - which might be incompatible with the positively charged BTMS?

Thanks a lot!/Rosa

rosa

Member

June 11, 2014 at 9:19 am in reply to: formulation with aluminium coated nano Titanium dioxide

Hi and thanks a lot for your help!

I made a cream batch yesterday without the green Tea extract. It actually turned out very different from what it used to turn out like. Seems very stable and a lot stiffer.

Yes, the TiO2 I am using is coated with aluminium alone and is water based..

I only tried yesterday with the red wine polyphenols, and it behaved exactly like the green Tea extract. I should have made a test batch with the green tea extract alone, that’s true. However, I am using it a lot in most of my other creams, sometimes combined with nano SiO2 and I think it has been fine.

I did question in another thread about the browning and I now think it could also be caused by the green Tea extract as was mentioned here (thanks!). Waiting for supplies and will make cream asap to find out, although it might take a while until it goes a bit brown usually. Will post as soon as I know and thanks again for all the help! Rosa

rosa

Member

June 10, 2014 at 5:11 pm in reply to: formulation with aluminium coated nano Titanium dioxide

Hi, it really appear to be the green tea extract that is the culprit - the least one I expected! I also did another experiment with red wine polyphenols - same thing. Is this common that polyphenols are destabilizing? I suppose green tea extract contains polyphenols as well? And why would it react with the Al-coated TiO2?

Thanks again!

rosa

Member

June 10, 2014 at 1:46 pm in reply to: formulation with aluminium coated nano Titanium dioxide

Hi, and thanks a lot for the input! The ingredients I listed are the base ingredients (before adding the additives) as separation occurs when I pour my oils in the water..

The Al-coated TiO2 is in the water phase, not as additive. O/W emulsion with ~80% water

I have been doing trials now for hours! It appears to be either GABA or the green tea extract, I believe that causes the instability, together with the TiO2.

I have no gum in the formulation, just Olivemulse (olivem1000) and no co-stabilizer..

Will tell when I know..thanks again/Rosa