CHEMICAL COMPOSITION OF MAIZE GRAIN 647 



Protein occurs to some extent in all parts of the maize CHAP, 

 grain, but not in equal proportion. Voorhees (1) finds that X1IL 

 the portion richest in protein is the horny layer, and this is 

 confirmed by Hopkins (4). The latter (3) gives the distribution 

 of the protein, in a medium protein maize, as follows:— 



Table XC. 

 DISTRIBUTION OF PROTEIN IN PARTS OF THE MAIZE GRAIN. 



In Tip Cap 



In Hull 



Total in Pericarp 

 In Horny Gluten .... 

 In Horny Starch .... 



Total in Horny Endosperm 

 In Crown Starch .... 

 In Tip Starch ..... 



Total in Starchy Endosperm 



Total in Endosperm 

 In Embryo, or "Germ 1 ' . 



Total 



Totals. 



"As an average, about 22 per cent of the total protein is 

 contained in the horny gluten, nearly 40 per cent in the horny 

 starch, and nearly 20 per cent in the germ, thus these three 

 parts contain about 80 per cent of the total protein in the 

 kernel" (Hopkins, 3). 



High protein maize is characterized by the large proportion 

 of the horny part, and a correspondingly smaller proportion of 

 the white starchy part. 



601. Protein obtainable front I OO lbs. of Maize Grain. — 

 Hopkins (3) gives the following tables showing the weight and 

 distribution of the protein that may be obtained from 100 lbs. 

 of maize grain : — 



