bluenova@together.net writes:
I've been particularly interested in your discussions of Olivem (which I
adore) and I don't remember reading this little piece of advice before.
I've been experimenting with Olivem over the past year and you have
helped me with products I have purchased from your site.
What would the reason(s) be for adding the water soluble additives only
at cool down? I've been using several herbal extracts (from the
Herbarie) that I've been adding them earlier, but I've also been using
HEC (per your recommendation) in the water phase too. Very curious to
hear your thoughts!
Most kindly,
---Susan Snowden<<
Hi Susan,
I'm glad to hear you like Olivem 1000! It's one of the nicest of the new
self-emulsifiers. The problem with adding SOME ingredients to the water phase
is that they can interfere with how the emulsion forms. If the emulsion
doesn't form properly, it will not be stable. I should have specified which
ingredients can be problematic when added to the water phase because some are
fine and some NEED to added to the water phase prior to forming the emulsion.
Hydroxyethyl Cellulose (HEC) and almost all of the gums and starches should
be added to the water portion and allowed to hydrate. The Herbarie HEC as
you probably know should be added/dispersed into room temperature water and
when heated will hydrate and swell. Most gums (ie. GuarSilk, XanThix,
MaizeThix) prefer addition to room temperature water and hydration at room temperature
- then once hydrated can be heated. But at any rate, gums/starches don't
typically have any adverse effect on emulsifiers. The emulsifiers that form
the lamellar gel structure actually form more stable emulsions when natural or
synthetic polymers such as gums are utilized. Make certain the gums utilized
will be compatible with the emulsifier choice (anionic/cationic).
Some extracts and other additives such as hydrolyzed proteins can interfere
with how the emulsion forms and destabilize the emulsion. It will depend on
the particular extract or additive and will also depend on the particular
self-emulsifier. For example, Olivem 1000 definitely does not like hydrolyzed
proteins in the water phase. But some extracts may not be a problem at all.
Some of the ingredients that may create problems when added to the water
phase are:
-hydrolyzed proteins
-preservatives
-some extracts
-cationics
-anionics
Very often these same ingredients can be added to the emulsion during the
cooldown phase without problems.
When formulating, particularly when forming emulsions, "order of addition"
makes a difference in outcome.
I hope this helps!
Angie
The Herbarie
_www.theherbarie.com_ (http://www.theherbarie.com)
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