1915] Arthur W. Thomas 3^9 



nected to a Cg — Cg radical by means of a linkings. Since a link- 

 ings are easily attacked it can readily be seen why protodextrin II 

 is so easily converted to sugar. This saccharification can be repre- 

 sented in two stages by the equations 



1. (Ce) — y— (Ce) -a— (Ce) — (C«) — a— (Ce) — y— (Cß) 



Protodextrin 11 



-> (Ce) -y- (Q) -^- (Ce) — (Ce) + (C«) -y- (Ce) 



7-maltodextrin maitose 



2. (Cc)-y-(Ce)-^-(Ce)-(Ce) 



->(Ce)-y-(Ce) +(Ce)-(Ce) 

 maltodextrin maitose dextrinose 



Synkiewski points out that C54, the number of carbon atoms in 

 the amylogen group, is not a multiple of C36, the number of carbon 

 atoms in protodextrin II, hence the molecule of protodextrin II 

 cannot be f ormed f rom a single amylogen group. Both amylogen, 

 and the last named dextrin, have in common the Cig group, so that 

 C54 = 3(Cis) and C36 = 2(Ci8). Since, however, these sub- 

 stances come from the starch molecule quantitatively he feels that 

 there can be no doubt that the 2(Ci8) residues of protodextrin II 

 originate from two amylogen groups according to the expression, 



2[3(Q8)]=3[2(C,s)] 

 er, since the starch molecule consists of « amylogens, 



w[3(Q8)] = t [2(Ci8)] 



From the fact that the protodextrin-II molecule is made up of 

 two different amylogens bound together by only a carbinol linking, 

 it follows that the linking which joins the two Cjg groups of proto- 

 dextrin II is a carbinol bond (the bond in the dextrinose molecule). 



The amylogen nucleus consists of nine glucose groups, contain- 

 ing nine carbonyl radicals; but, since amylogen does not reduce 

 Fehling Solution, all the carbonyl groups must take part in uniting 

 these glucose groups. 



Synkiewski thinks that there are two possible ways in which 

 these glucose residues may be joined together: between the nine 

 glucose molecules there are eight carbonyl bonds, which causes the 



