Improvements in the Treatment of the Bye-Products, Brewers' and Distillers' Yeast, or either of them, whereby a Substance is Obtained that can be used as a Food by Man and for other purposes.
Year: 1897

page_text: Date of * Application, 19th Aug., 1897
Complete Specification Left, 3rd Mar., 1898-Accepted, 4th June, 1898
Date of Application, 19,
Complete Specification Left, 3rd Mar., 1898-Accepted, 4th June, 1898
PROVISIONAL SPECIFICATION.
Improvements in the Treatment of the Bye-Products, Brewers' and
Distillers' Yeast, or either of them, whereby a Substance is
Obtained that can be used as a Food by Man and for other
purposes.
I, CORNELIUS O'SULLIVAN, 148; High Street, Burton-on-Trent, in the County of
Stafford, Chemist and Brewer to Bass, Ratcliff, & Gretton, Limited, same town &
shire, do hereby declare the nature of this invention to be as follows:-
Yeast, the bye-product of the brewer or distiller is pressed in the usual way,
packed into suitable vessels and kept at a proper temperature, preferably 80° to 100° F.,
until such time as it shall have acquired the greatest degree of fluidity. The
product is then diluted with its own bulk of water and submitted to filtration on
suitable filters. Or, it may be submitted to filtration without dilution. In either
case the residue can be washed with water. The filtrate is heated to the coagulating
The
point and retained there for some time. It is then heated to boiling.
coagulam is filtered out and the filtrate concentrated in a vacuum or under ordinary
it can be
pressure to the proper consistance, say that of ordinary meat extract, or,
reduced to a dry powder by proper appliances, in either of which forins it is
available as an article of human food and for other purposes.
"
Improvements in the Treatment of the Bye-Products, Brewers' and
Distillers' Yeast, or either of them, whereby a Substance 18
Obtained that can be used as a Food by Man and for other
purposes.
'1'
I, CORNELIUS O'SULLIVAN, of 148, High Street, Burton-on-Trent, in the County of
Stafford, Chemist and Brewer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
This invention relates to the treatment of brewers' and distillers' yeast for the
production of a substance, suitable more particularly as an article of diet and
resembling ordinary meat-extract in odour, flavour and composition.
The main object of the said invention is to bring about such changes in the yeast
plasma as will admit of the elimination of the useless and objectionable constituents,
(namely the cell-walls of the yeast, and the bitter substances closely related to, or

page_text: identical with, bitter hop-resins always present in brewers' yeast,) from the useful
and agreeable constituents of the plasma. I thus obtain a substance which contains
only the latter constituents of the yeast and is suitable as an article of diet, for
enriching foods for human or animal consumption, or for other purposes.
According to my said invention, the material known as pressed yeast is packed
into suitable vessels and is kept at a temperature of from 80 to 100 degrees
Fahrenheit say for a period of from eight to ten days more or less, until it shall have
acquired the greatest possible degree of fluidity.
The semi-liquid product, which may advantageously be diluted with its own bulk
of warm water, is then subjected to a filtering operation so as to remove the cell-
walls of the yeast, and also the bitter substances above referred to, if any be
present, as well as any foreign insoluble matters that were contained in the pressed
yeast.
The filtering may advantageously be conducted in a filter press, through a
layer or thickness of any well known filter-felt or filter-cloth, and the residual
matters left in the filter, may be washed with water which may be allowed to com-
mingle with the filtrate.
The latter is then heated to a temperature of from 150 to 160 degrees Fahrenheit
or thereabouts in order to effect the coagulation of the unaltered albumenoids con-
tained in such filtrate.
.
The temperature is then increased and the said filtrate is kept at the boiling point
for a period say of 20 to 40 minutes in order to collect the coagulum and to destroy
completely the further action of the enzymes of the yeast-plasma.
The liquid so treated is then again filtered in the same manner as before to separate
from it the coagulated matters, which contain also a further quantity of the aforesaid
bitter substance. The filtrate from this last filtration consists of a solution of
phosphates, leucine, carnine, guanine, sarcine, and other products derived from the
breaking down of albumenoids, and also contains another substance poor in nitrogen
and capable of yielding a sugar on treatment with acids. This filtrate may be
concentrated by evaporation either in a vacuum or under ordinary atmospheric
pressure until it assumes a suitable consistency, say that of ordinary meat-extract, in
which condition it may be used as the improved article of diet which it is the object
of my invention to obtain.
The concentration may however be continued until a solid product is obtained
which can be broken up into grains or powder in any suitable manner, and can be used
either alone as a condiment or article of diet, or for enriching other foods whether
intended for human consumption or for feeding animals.
The substance obtained as hereinbefore described can, in addition to being used
as an article of food for human beings and animals, also be used as a food in
the production of the races or species of yeast that are used in the preparation
of bread.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. The hereindescribed process for the treatment of brewers' or distillers' yeast,
substantially as and for the purposes described.
2. The improved substance, suitable as an article of food and for other purposes,
prepared substantially as hereinbefore described.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.