384 



TABLE I. 



Influence of .< aminobutyric acid, -^-aminoisovaleric acid and a-aminoisocaproic acid 

 on the destruction of glucose by alkali. 



NO. 



Added 



I- _- TO 2 



'ill 



Polarisation in 



grades Ventzke 



(2 dm. tube) 



Colour of the 

 solution 



o en 



At begin- After 



ningofthe _i_ 31/ 



experi- .— '- 



ment 1) hOUrS 



After ± 

 21 hours 



After 4 

 6x24 

 hours 



id. 



o. 



E 



lU 



a- 1 1 ti -^ 1 1 4 1 colour- colour- 



+ 11,5 +11,4] ,g55 jggg 



o, 



•a 



c 

 «J 



u. 



I J, , pale pale 



"r°»' vpllnw vplln\ 



yellow yellow 



2) +6,8 yellow I yellow 



2\ I _i_e;fi yellow ' brown 



i) -\-0,0 hrnwn vpllnw 



brown yellow 



I I deep J 



+ 10,0 +4,6 yellow- .^^^P„ 



brown 



brown 



10,5 



6,5 



o. 



a» 

 •a 



+ 10,7 +6,6 



+ 10,6 ! + 6,5 



^Z 



o^ 



:iz 



I I deeper I ^ 



+ 10,3 i +4,6 yellow- ^^„^ 

 brown 



-[-1,2 and +2,5 (Nrs. 4 and 7) the addition of 2 nnilligrammoieciiles 

 of «-^-aminobutyric acid and «-aminoisovaleric acid causes that in 

 presence of the same quantity of hydrochloric acid the polarisation 

 has diminished only to respectively +12,2 and +11,9 (Nrs. 5 and 

 6). From this results that the added quantities of these amino acids 



1) Between the dilution to 50 cm^ and the determination of polarisaliou of 

 course some time passes. 



-) The polarisation was not determined ; the results obtained would lie be- 

 tween that of N". 1 (+ 11,5) and those of Nrs. 5 and 9 + (10,0 and + 10,3) and 

 would diminish gradually from N^. 2 to N". 4 (Compare the results obtained before). 



