Chocolate contains a non-volatile fat (cocoa butter) in large amount, and should be classed as a food as well as a beverage.
When the base is insoluble in water, and non-volatile, but existing in the plant as a soluble salt.
This is different from what we found in the case of non-volatile solutes (p. 126).
Distillation separates all non-volatile matter, including organised bodies.
Turning now to the non-volatile and oxygenized bases, we take up first the opium alkaloids.
In a general and strictly chemical sense this term is applied to the salts of the non-volatile fatty acids.
This residue is taken for the determination of the non-volatile acetylizable impurities (see acetin method).
A correction for the non-volatile impurities may be made by running a bichromate test on the residue at 160° C.
From a clinical study of Rhus poisoning, Pfaff came to the conclusion that the poison must be a non-volatile skin irritant.
When the base is insoluble in water, non-volatile, and existing in the plant in an insoluble form.