Improvement in the Purification of Yeast.
Year: 1891

page_text: Date of Application, 25th July, 1891
Complete Specification Left, 18th Sept., 1891-Accepted, 24th Oct., 1891
PROVISIONAL SPECIFICATION.
Improvement in the Purification of Yeast.
I, HARTOG ELION, of 336, Hoogstraat, Rotterdam, in the Kingdom of Holland,
Doctor of Philosophy, do hereby declare the nature of this invention to be as
follows:-
This invention relates to the purification of yeast, especially beer yeast, whereby
those substances which have a prejudicial effect on its taste, smell and colour are
removed; yeast purified according to my invention being particularly suitable for
baking purposes.
In purifying yeast according to my improved method, the yeast is mixed with
water, or other harmless liquid, in order to disunite the yeast cells. The mixture
is then conducted to a centrifugal machine, by the action of which the yeast is
separated. The impurities remain in solution or suspension in the water, or other
liquid employed, and are discharged therewith; the yeast, in a purified state, being
left in the machine.
Dated this 21st day of July 1891.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvement in the Purification of Yeast.
I, HARTOG ELION, of 336, Hoogstraat, Rotterdam, in the Kingdom of Holland,
Doctor of Philosophy, 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 purification of yeast, especially beer yeast, whereby
those substances, such as hop bitter and other impurities, which have a prejudicial
effect on its taste, smell and colour, are removed; yeast purified according to my
invention being particularly suitable for baking purposes.
In purifying yeast according to my improved method, the yeast is mixed with
water, or other harmless liquid, and the mixture is subjected to a treatment adapted
to disunite the yeast-cells and to separate them from the solid impurities; such a
result being effected, for example, by agitating the mixture and passing it through
a sieve. The mixture is then conducted to a centrifugal machine, by the action of
which the liquid becomes separated from the yeast. The impurities remain in
solution or suspension in the water, or other liquid employed, and are withdrawn
therewith; whilst the yeast, purified and in a pasty condition, remains disposed
about the inner surface of the rotating drum, which, for the purpose of the present
invention, is of an impervious character. The yeast is then removed from the drum
and is ready for use, or for such further treatment as may be desired.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I claim :-
The improved method of purifying yeast and removing those substances which
have a prejudicial effect on its taste, smell and colour, substantially as herein
described; such method consisting in mixing the yeast with water or other harmless
liquid, subjecting the mixture to treatment adapted to disunite the yeast-cells an
to separate them from the solid impurities, and submitting the same to the action of
Di A3 1

page_text: a centrifugal machine whereby the water or other liquid becomes separated from
the yeast, the impurities passing away with the former, whilst the latter remains
disposed in a pasty mass about the inner surface of the impervious rotating drum.
Dated this 18th day of September 1891.
G. G. M. HARDINGHAM,
191, Fleet Street, London, E.C., Chartered Patent Agent..