chemicalmatt
Forum Replies Created
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That’s a good place to start. Looks like you’ve figured it out.
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You may want to avail the used market for that incubator - Equipnet has plenty at all price ranges - see link below. As for viscometers, Brookfields are the known Standard, so look around for a used one, preferably an RV with helipath for those creams. The older models with analog meters never die. Built to last back when “Made in America” meant something.
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Most low MW glycols may be used, only with varying results, as others have noted. Gycerin is too sticky as they said. Butylene glycol works and brings down the tack and irritation (but you still need PG). I always added a little alkanolamide ( alas, cocamide DEA worked best) to aid propel-repel and maintain translucency to please the marketing peeps. As for gellants, nothing I know works better in that system than sodium stearate and you must use the right grade too: OP-100 from HallStar.
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Nope. Ceramides don’t like heat. Add to o/w emulsion during cooling process below 50C. IF using in w/o use in a low energy (RT) inverse emulsifier system like Abil EM or DC 5225C.
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What Pharma said: doesn’t appear to be enough TEA in there to neutralize that acrylate. To reduce tack, add ZERO glycerine but 3% propylene glycol will help. PEG-10 dimethicone will help better. On the other hand, if you have access to 3V Sigma products, why not just use RapidGel EZ-1? You may then eliminate the TEA, the PEG-400 and the glycerin. That is the best alcohol gellant in the world today.
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For 99.9% of formulations distilled works just as well as deionized. In fact for 90% of formulations good quality tap water (like Chicago’s) works fine. Just add a little Na4EDTA and get on with your day.
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Negative on the humectancy. Positive on the lack of tack. Stick with the greater ratio glycerin I mentioned and add another mufta of PG.
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I have never been able to use these emulsifiers by themselves - no matter what the suppliers claim. However I was able to build viscosity and some elegance with the usual liquid crystal combo of cetyl alcohol/glyceryl monostearate as lewhitak has done, but required much higher amounts than that. Regardless, these fall way short of the utility afforded by the ethoxylated nonionics, but they are here to stay as EO gets phased into the corner of our tool set.
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Looks like you have every pre- and pro- biotic under the sun in there, so I sure hope this works. Certainly will be expensive. Silver citrate should be compatible, so you may lose the Leucidal. The use of dimethyl isosorbide as a penetration aid comes up all the time in this forum: it is largely for use with lipid elements, and you have none in here unless that amber thingy is an oil. Lose it.
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Dimati: glycerin is the humectant, propylene glycol is added (1:4) along with glycerin to mitigate it’s tackiness. Unless tackiness is your goal - and some edge gels need that attribute - then use both.
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Get rid of salicylic acid - problem with cloudy/tacky solved. You don’t need it anyway of skin lightening is your goal. Adding C12-15 alkyl benzoate will solvate SalAc in this too if you just gotta’ have it. To add suspension properties to a lipid system you may want to explore hydrated silicas, like the Aerosil & Sipernat line from Evonik. EV makes a good suggestion too: mix up your triglyceride oils to change the polarity around a bit.
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Some insights here, rookie driftmark: your emulsification system includes cholesterol, and at 0.20% that is plenty emulsifier along with the two surfactants. HLB figures around 7 - 8 if I did the math right, so you are getting a stable product, no? Not sure what that CA-20 is (INCI ???). Germaben II is MUCH better than Optiphen, so go ahead with that sub. (Ashland peeps may not like hearing that but what can they say?). You have too much of nearly everything in here, so tone this down. It appears to me somebody was trying to sell HYA and ceramides, likewise sea buckthorn anything, and that niacinamide content will give people the red face flush for sure. Cut all those things by half - at minimum - including tocopherol, panthenol, glucosamine. Add a little cetyl alcohol (1.0%) for stability, consistency and opacity. Also, do not heat up ceramides past 55C, unless it comes from another planet. Finally we do NOT call these compounds recipes - never - we call them FORMULATIONS. Recipes you can eat, right? Cheers.
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With low Aw and high pH you may get away with it, and saponification products ala Dr. Mike’s usually meet those parameters, but I don’t advise it. A little Kathon never hurt anybody, and I mean anybody.
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Easiest trick in the book is to disperse hydroxymethyl cellulose resin (Methocel from DOW) first (0.50%) then add surfactants, and less of that CAPB. The Methocel will keep the foam from collapse.
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Should not need one at that pH and Aw, but one of the acids e.g. benzoic, sorbic, undecylenic would be appropriate. As for the smell, lactates can smell wonky after a spell, kind of like sweat. Just a hunch, not a certainty. That green tea may not be acid stable also.
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Add a polymeric film-former (best) or add lanolin itself (why use a substitute?) to extend into a film.
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Not one ingredient but several. Two anionic surfactants plus one amphoteric surfactant, depending on mass ratios, will make a viscous solution. Beef that up with Polyquat-10 and you build more. Finally adding electrolytes (sodium citrate/citric acid) and it builds even more. Glycerin beats it back down.
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GCC does not contribute any yield value so it will not suspend anything unfortunately; a misnomer by Stepan. However, it works really well as a surfactant builder for viscosity as you found out plus it is an excellent solvent as well. I built a nifty graffiti remover with it a few years back. (And, no, I do not work for Stepan, but Perry and I do know some fine chemists here in Chicago who do.)
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With those styrene/acrylates I remember somewhere in the past that a little fatty alkyl amine added will raise the Tg, make film harder, less tack, more gloss and more water resistant. Cannot remember which one to use though. I’m thinking C16 or higher, maybe even an alkyl amidoamine.
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I second what EV said: caustic soda is manufactured annually in the millions of metric tons and one of least expensive chemicals on the planet. Just source & buy. Easy.
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Bioscreen Testing Services in SoCal.
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This should help: https://www.indco.com/
Pyrex is same as Kimax and get those anywhere, like VWR (Fisher) or Qorpak. -
Isothiazolinones…BIT in the parlance of the HI&I world…at 0.10%. Done. Also, double that EDTA unless you wash dishes in the woods, then triple it.
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That is not pure lecithin but the typical 55% dispersion in soybean oil, so your activity level is less, and this should be a 2-phase procedure not a one-pot. Double it and add your oil to that (you have a o/w emulsion here) at 80C, then slowly add to the water phase. IF you can live with a little high fructose corn syrup or just sucrose or another saccharide to your water phase, that will help matters along. Like Pharma said: not all lecithins are the same. The phosphatidyl choline: phosphatidyl serine content makes a HUGE difference and I think that website source is unaware of that. (They are also marking that product up by 400% more than commercial.) As for preservation: have you tried adding vodka?
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I have a much simpler explanation than all of these, Katerina: they simply left the borax off the INCI listing, knowing sodium borate might be objectionable in certain circles. Omissions like these are not uncommon especially when you have direct sales involved. Add a little borax and viola’: Blandcream. (I would have loved to be in that market team meeting when that product title was decided on … difficult holding laughter back)