Dry food product containing live probiotic
The disclosure relates to a probiotic delivery system that can be consumed as a snack-food or added to a food product. In particular, the disclosure describes a crisp and tasty treat that comprises viable probiotic microorganisms preserved in a vacuum dried matrix of sugars, proteins, and polysaccharides. The probiotic remain viable within the treat for a longer time without the need for additional moisture barrier coating. The probiotic also remain viable in the animal gastrointestinal tract.
1. A method of making probiotic substance, food product or feed substance, the method comprising:
a) mixing a preparation of probiotic micro-organisms with at least one sugar, at least one protein, at least one polysaccharide and optionally additional functional ingredients to obtain a smooth and uniform slurry, and optionally adding a crosslinking chemical to form a gel in a desired shape and form; and
b) vacuum drying the slurry or the gel to a water activity below 0.2, wherein the vacuum drying comprises: setting the temperature of the probiotic substance above its freezing temperature; and vacuum drying at reduced pressure of about 5000 mTorr at a shelf temperature of from 5-50° C. and then gradually decreasing the pressure, as the temperature of the probiotic substance increases, down to a pressure of about 100 mTorr while maintaining the shelf temperature from 5-50° C.;
wherein the at least one sugar comprises trehalose, the at least one polysaccharide comprises an alginate, and the at least one protein comprises egg white, soy protein isolate, soy protein hydrolysate or a combination thereof.
2. The method of claim 1 , wherein the slurry is not cross-linked before drying.
3. The method of claim 1 , wherein the slurry is cross-linked before drying.