30 



Literature on Inosite-Phosphoric Acid 



[Sept. 



TABLE 2 (coniinued) 



Name of 

 Author 



Elements 



Carbon 



Hydro- 

 gen 



Phosphorus 



Barium 



Magne- 



Calcium 



Other 

 Metals 



Ratiosl 



C=6 

 P=x 



P=6 

 M'=x 



Posternak. 



Rising. 



Suzuki, 



Yoshimura, 



Takaishi. 



Vorbrodt. 



Winterstein. 



Winterstein, 

 Schulze. 



(A large number of preparations were raade in which several kinds of 



seeds were used.) 



9-97 

 4-79 

 7-25 

 7-44 



6.51 



5-37 1 1-03 I 



(Preparations from barley bran.) 

 13-08 I I I l52.6s(Ag)| 



(Preparations from rice bran.) 



1.21 



I 23.48 I 



I S-81 I 17-48 I 



(Preparations from corn.) 



15.18 I42.62 I I 



(Preparations from black mustard.) 

 18.42 I I 7-8 I I 



9.65 I 2.83 I 15-20 I 



I 



I 5-5 

 I - 



I 3.7 



II 



4 

 12 



I 7 



1 6 I 10.6 



8 

 6.5 



— ?* 



The alkali salts are hygroscopic, but the others do not change in 

 weight under ordinary conditions. Posternak assigns to the double 

 alkali salts of the alkali earths eight molecules of water. The 

 barium salt prepared by Vorbrodt lost 9.33 per cent. of its weight in 

 the presence of phosphorus pentoxid, but regained it when exposed 

 to a moist atmosphere. At 110° C, 11.5 per cent. was lost. Ander- 

 son reports for his tri-barium salt five molecules of water, for his 

 tetra-calcium salt twelve, and for his penta-magnesium salt twenty- 

 four. 



Inosite-phosphoric acid is easily decomposed by heating with 

 strong acids in sealed tubes but does not spontaneously break down 

 into its cleavage p'roducts. Mendel and Underhill kept a Solution 

 of the acid for many months and found at the end of the time no 

 apparent change. Posternak states that heating phytin in alkaline 

 Solution to 100° C. causes no decomposition, but Winterstein found 

 that if a twenty per cent. Solution of alkali were used (sodium 

 hydroxid) and the temperature raised to 230° C, cleavage occurred. 

 Contardi states that cleavage does not occur when these salts are 



* Extracted with sodium chlorid Solution, precipitated by heating, and fil- 

 tered hot. 



