BULLETIN OF THE 



No. 215 



Contribution from the Bureau of Chemistry, Carl L. Alsberg, Chief. 

 May 21, 1915. 



(PROFESSIONAL PAPER.) 



COMPOSITION OF CORN (MAIZE) MEAL MANUFACTURED BY 

 DIFFERENT PROCESSES AND THE INFLUENCE OF COM- 

 POSITION ON THE KEEPING QUALITIES. 



By A. L. Winton, 1 W. C. Burnet, Chemist in Charge, Savannah Food and, J)rug 

 Inspection Laboratory, and J. H. Bornmann, Assistant Chemist. 



CONTENTS. 



Introduction J '. . . .- 1 



Consumption of corn meal . 2 



Manufacture of corn meal 3 



Products of corn milling. . . ; . , . . . 5 



Composition of the products of corn mill- . 



tag- ... I'.'. 6 



Spoilage of meal... ...'.; '. . . ( . 15 



Relation of moisture' content to keeping qual- , _ ■ 

 ity of degerminated bolted roller-ground 

 meal 16 



Comparative keeping quality of whole^kernel 

 stone-ground meal and degerminated bolted , 

 roller-ground meal 22 



Summary.;.....-. — :...... ...........j — .. 30 



INTRODUCTION. 



The cause, detention, and prevention of the spoilage of Indian corn 

 have been given special attention by the investigators in the Bureau 

 of Plant Industry who have studied the subject from the chemical, 

 biological, and toxicological standpoints. In view of the fact that an 

 excess of moisture is conducive to spoilage as well as shrinkage, 

 Brown and Duvel 2 have introduced a rapid method for the deter- 

 mination of this constituent which has come into extensive use in 

 grain standardization laboratories as well as in elevators and mills. 

 The percentages of moisture obtained by this process are important 

 factors in determining the grade of market corn. 



While moisture is doubtless the most important of the controllable 

 factors causing deterioration, the determination of acidity has come 

 to be recognized as the best chemical means of detecting actual 



1 Dr. Winton was formerly chemist in charge, Food Investigation Laboratory. 



2 Brown, Edgar, and Duvel, J. W.T. A Quick Method for the Determination of Moisture in Grain. U.S. 

 Dept. Agr., Bureau of Plant Industry Bui. 99. 



Note. — This bulletin is of interest to corn millers and dealers in corn and corn products and is suitable 

 for distribution in all parts of the country. 



85755°— Bull. 215—15 1 



