Yeast

Patented Aug. 10, 1948 2,446,737
UNITED STATES PATENT OFFICE
2,446,737
MANUFACTURE OF YEAST
Finnin Boinot, Melle, and Jean Boige, La Noblette-
Melle, France, assignors to Les Usines de Melle1(Sociefe Anonyme), Saint - Leger - les - Melle,
France, a company of France
No Drawing. Application May 16, 1945, Serial
No. 594,156. In France September 17, 1943
3 Claims.
1
It is knownthat yeast is produced by large
amounts in industry from sugars or from various
carbohydrates. As the methods in use are well
known, we shall not make a detailed description
of them. However, wemight remind that one
generally performs “ successive breedings or
growths,” the number of breedings being limited
to three in actual practice. The original content
of glucids in the mediumdecreases from the first
breeding to the third. As an example, one uses:
For the first breeding: 100 kgs. of molasses
diluted to a total volume of 1,700 litres.
For the second breeding: 100 kgs.of molasses
diluted to a total volume of 2,000 litres.
For the third breeding: 100 kgs. of molasses
diluted to a total volume of 3,000 litres.
After all fermentable glucids in the first breed­ing have disappeared, yeast is extracted accord­
ing to known processes and wholly used “in the
second breeding. Likewise, yeast from the second
breeding separated in the same manner afterthorough disappearance of fermentable glucids,
is wholly used for the third breeding. It is only
after thorough disappearance of all fermentable
glucids from the third breeding solution that yeastis Anally extracted for further use.
It will thus be realized that an essential char­
acter of the prior method is the feature of carry­
ing yeast proliferation in each breeding, so far ascomplete disappearance of available glucids takes
place.
The yields in such process vary from 130 to 150
kgs. of pressed yeast containing 72 per cent of
moisture for 100 kgs. of glucids available...