Bauhaus-Universität Weimar

Titel:
Reports of Visits to Foreign Laboratories, vol. 1 (1907) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith
Person:
Benedict, Francis Gano
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39744/240/
cï n f *• 
Z Z o 
This produces of course iodine from the free acid and this is titrated 
with sodium thiosulphate until the color disappears- Starch is not 
considered necessary as an indicator. The acid used is sulphuric 
acid, 14th normal, and for each 25 cc. of acid used, 2 cc. of a 4 per 
cent solution of potassium iodate are required. 
The whole description of the Kjeldahl method was given in a publi¬ 
cation entitled lieddelelser fra Carlsberg Laboratoriet. In 1385, 
Kjeldahl there described his method for determining nitrogen. In 1891 
the method for the moist combustion process for carbon was there given- 
The Ejeldahl method is so closely adhered to in this laboratory 
that the original distilling tubes on top of the Kjeldahl flasks when 
distilling off the ammonia are used. I have ordered a set for our 
laboratory. 
Experiments on feeding animals with hydrolized proteid.—fienr : quee 
and Hansen found that when the protein was split with sulphuric acid 
until there was no more biuret reaction, then the animals could not 
use it to build up protein. {Dr. Spence of Liverpool pointed out that 
this cleavage with acid was lower than that with ferment.) If they 
(■St* 
spxit with trypsin and erep>sin until there was no more biuret reaction, 
they found the animal could synthesize the protein. In their experi¬ 
ments they used rats but found that they could not feed them longer 
than three weeks as they then refused food. The animals must be kept 
warm. 
Voit resylratiop apparatns.—A small apparatus for animals was 
formerly used by Messrs. Henriques and Hansen. Samples of the air 
were taken and collected over mercury according to the method of Eohr, 
but the analyses were not considered satisfactory and the researches 
were given up.
        

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