CHK.MICA!. BASIS "1 i Hi: ANIMAL 1:>DV. 

 >imilarly obtain* ,1 l.y tin- limited action of malt-extract or pau- 



The dextrins i< II < >,). 



When the hydn-lytie action of saliva, malt >i jum i 



an-h-pa-te is prolonged, tin- lir-t-fornied soluble-tan li 



idly changed into a nmnbei to which 



il name of dextrin is LJIVII. These pnlii' t- an- inter 



'n soluble-starch ami th> A'hieh result 



'inplete hydrolysis of starch, and are probably v.-iv num-r- 

 he similarity in tin- pn>|>erties of tin- siicrr-MVely f< 



rini,' their >eparation and char nn-ly 



:lt. They .in; all precipitable by alcohol, and differ fr-.m 

 .Ide-.-turch in yielding no precipitate with tanni-- acid. 



If during the earlier stages of the h\dio- 

 i-paste, si; jiortimis of the solution he t 



I iy the addition of iodine, it may he observed that the pure Mm- 

 whi-'h it yields at first passes gradually through violet ami 

 di-h-violet to ivddish-hrown, the latter colour being supposedly 

 due to tl. the solution of erythrodextrin, whence the 



I '.ut little is definitely known i.f tins dextrin as a chemical 

 individual, its chief characteristic Kein^ the colour it yields with 

 violet observed during the earlier ^ta^e* of ii\dro- 

 is due to an admixture of the Idue due t" so]uMr--tan -h 

 with the iv d of the erythrodextrin. 



i. -\trin, whii-li i> MTV impure, omtainini; de\t r..- 

 iitly unaltrrt-il .-.tar.-li. iiMiall y \ i.-l.; ng red colour*- 



he atlilition of 



When, during the ]>,;,!,,. 



lysis of starch under ordinary conditions, the addition ,,f 



i'Mline ceases to give any colouration, the fluid now contains much 



r together with a con-id. -rahle hut variable proj.ortion of this 



ii has received its name from it- U'haviour t"\\anl- 



.IdiiiL' no colour with this rea : I* , t' 



ned during ' "/'/ artificial di^--ti ...... f 



ii \\ith sjiliva ( -be 8epa' 



its .solution by c-oncentration airl the addition of an excess 

 of alcohol. A- thus prepared it \\ith much adl 



<ise (see below), from which it cannot 1 | freed by 



wash: h alcohol or by successive solution in water and 



Mtion with alcohol A partial separation ma\ IK; ob- 



ible raloe of * in certain CM6, Brown and Morrin. eil. *f> 



ftwot. Cktm. Bd. ir. (I MO), S 



. 



