Thanks for your excellent observations and posts. I’ll try to clarify where I can, and explicitly say so where I can’t. I am not a chemist and will make no pretenses about what I am not qualified to answer. However, I will say what I think, not know, about strawberry fading.
So the short answer to the use of any high shear mixer is that they are purely mechanical devices that produce a number of functions to achieve desired results, These include particle size reduction, cellular disruption, emulsification, mixing of powders with liquids which are otherwise very time consuming and difficult, and homogenization. (More below) Of course many of these functions are combined.
Nail on the head. As a requirement I had to take a course in the philosophy of science where it is made clear that absolutes are essentially non existent. It is by empirical observation under carefully controlled testing involving only one variable which will produce acceptable scientific conclusions and eliminate all bias. Otherwise “empiric” conclusions are made which equate to quackery, magical thinking, forgone conclusions etc. etc.
Ummm, nail on head again: no answer unless it is nonsense like “you can’t” “but you don’t …” etc. etc. I have never said that the conventional “steep” method doesn’t work. When I hear “steeped” I know that people mean vape ready juice. What I reject is assigning “rules” to what amounts to thousands of flavor concentrates which are all made with different chemical compositions. I think a reasonable question is "OK, tell me what chemicals are in the concentrate that are reacting with another that causes this vague “degrading” and “harm” and for those with a bugaboo about using controlled heat, at what temperature do these occur. Crickets…
The chemists are experts and getting very good at making concentrates for our purposes. But all our e juices have one thing in common; VG.
It is well established that VG is a poor solvent. Our concentrates for the most part are pg based and while very thin and much lighter has excellent properties as a solvent and therefore dissolves the flavor materials and keeps them dissolved.
With heat VG becomes less viscous (thinner) but as with nearly all chemicals it becomes more soluble e.g. it will dissolve the flavor materials. Combined with the mechanical forces of a high shear mixer it will homogenize the mix of dense heavy materials with the very thin ones and make it uniform. VG’s properties, necessary for vaping, is the obstacle. Some concentrates readily dissolve and penetrate VG. Some others damned near never do without the use of mechanical energy.
As ffar as the fading issue, I routinely make strawberry mixes. I have used a high shear homogenizer for well over two years without any fading issues with strawberries and with Lemon Sicily which many say tends to fade. I do recall these issues from years ago. What I think may be causing these issues is that the creams eventually overpower these flavors and or you may have too much EM in the recipe which will trick your senses. I use a combination of Red Touch FA and INW Shisha Strawberry which work very well for me. Since I don’t have to wait for creams and custards I have likely adjusted my mix where I have a good balance and don’t experience fading.