Process for hard coating with sorbitol and products obtained the

Details Process for hard coating with sorbitol and products obtained the Process for hard coating with sorbitol and products obtained the

1981-06-16

1983-12-27

Silverberg, Sam

Coating processes

Fraud or tamper detecting

426548, 424 31, G01K 932

Patent

active

044230869

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a method for hard coating (preparing hard dragees).
It also relates to, as novel industrial products, the coated products so obtained.
It will be recalled that, by the expression "hard coating" is meant any process consisting of coating a preformed element or core with an adherent envelope, atmospheric moisture and the oxygen of the air, shock and abrasion as well as a more attractive appearance and a particular flavor or taste.
The concept of so-called "hard" coating is distinguished from that of so-called "gentle" (soft) in that it implies complete crystallization of the envelope with the evaporation of all the water contained in the constituent material of the latter.
It is in the confectionary industry and pharmaceutical products that hard coating finds its principal uses, it being recalled that "confectionery" which can be coated comprises notably chewing-gums, chewing pastes, sweets (candies) and liquorice, and that pharmaceutical products, liable to be coated, are constituted notably by tablets, pills or bonbons including medicinal substances or active principles.
Both confectionery and the above-mentioned pharmaceutical products may be of the conventional type, that is to say, including sugars such as saccharose, dextrose, fructose or glucose syrups; they may also be of the "sugarless" ("without sugar") type, that is to say based notably on polyols such as sorbitol, xylitol, mannitol or the non-cariogenic hydrogenated hydrolysate known under the trade-mark LYCASIN.RTM., and devoid of saccharose, dextrose, fructose, glucose syrups or equivalent products.
The coating of the core is carried out in a tilted tub rotating around its axis and called a dredger, inside of which there is a plurality of cores forming a moving mass, at the surface of which the constituent material of the future envelope is distributed.
This constituent material is conventionally saccharose.
Now, saccharose, like other sugars such as dextrose or fructose, has undesirable biological effects, notably from the point of view of dental caries. It can in fact very easily and very rapidly become acid because of the bacteria of the mouth. In addition, the sweet flavor of the saccharose is often little liked, especially in the hot season, the consumer then seeking in chewing-gums and confectionery generally, a refreshing and less sweet flavor.
It is, or course, particularly when the core is "sugarless" that the cariogenic character of the saccharose, when the latter is used for the formation of the coating, becomes redhibitory.
It is therefore quite naturally been suggested to resort in this case, to constitute the envelope during the coating process, to polyols already used for the constitution of confectionary or "sugarless" pharmaceutical products intended to be formed into dragees.
It happens that only xylitol and, to a lesser extent, mannitol are at present used for this purpose. They possess in fact, contrary to sorbitol, a hygroscopicity which is not high and good tendency to crystallization, the latter being carried out fairly easily from their aqueous solutions to give crystals of a well-defined type.
To achieve a satisfactory result with xylitol, it has however been necessary to turn to the addition of manufacturing auxiliary substances or additives, such as various fatty materials, various binders or suspending agents, the envelopes with xylitol alone changing rapidly in the course of time and forming small cracks, their outer surface, smooth initially, becoming wrinkled and the internal structure of the envelope, which has initially a microcrystalline character, assuming a rough structure unpleasant to the palate on chewing; in any case, it is no longer possible to speak then of a hard coating with xylitol, similar to that effected with saccharose.
As regards sorbitol, it is reputed to be completely inapplicable in a hard coating process. Thus, it has been clearly indicated, for example, that sorbitol can only be used as an ingredient of the core and not of the envelope, by reason of its hygroscopic

REFERENCES:
patent: 3185626 (1965-05-01), Baker
patent: 3480468 (1969-11-01), Carletti
patent: 4127645 (1978-11-01), Witgel
patent: 4241092 (1980-12-01), Halik
patent: 4293570 (1981-10-01), Vadaoz

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