UNITED STATES DEPARTMENT OF AGRICULTURE 



Contribution from the Bureau of Chemistry 

 CARL L. ALSBERG, Chief 



jrv^-^-ft- 



Washington, D. C. 



PROFESSIONAL PAPER 



June 5. 1920 



EXAMINATION OF FROZEN EGG PRODUCTS AND 

 INTERPRETATION OF RESULTS 



By H. W. Redfield 1 



CONTENTS. 



Page. 



Object of investigation 1 



Plan of investigation 2 



Preliminary investigation 3 



Results of preliminary investigation 3 



Discussion of results of preliminary in- 

 vestigation 14 



Progress of investigation 17 



Preparation of samples 17 



Examination of samples 18 



Page. 



Progress of investigation— Continued. 



Results of examination of samples 18 



Discussion of results of examination 55 



Interpretation of results of investigation 60 



Methods of examination of samples 77 



Methods tested 77 



Methods adopted 85 



Summary 96 



OBJECT OF INVESTIGATION. 



The preparation of frozen egg products is universally recognized as 

 an excellent means of conserving eggs which can not be sold in the 

 shell as a first-grade product. So extensive has the business become 

 that 19,286,396 pounds of this material were held in storage on 

 January 1, 1920. Careful studies of frozen egg products, by 

 M. E. Pennington and her colleagues, 2 have included studies of the 

 character of the raw material, the equipment and operation of break- 

 ing rooms, and the quality of the product sent into commerce. As 

 a result there has been a marked improvement in the selection of the 

 raw materials used and of the processes of manufacture, with a conse- 

 quent improvement in the quality of the finished products. The 

 examination of these products has been attended with what was sus- 

 pected of being a disparity of results when material of the same 



1 The investigation discussed in this bulletin was conducted by the author with the assistance of the 

 following members of the Bureau of Chemistry: M. K. Jenkins, E. A. Read, J. H. Bornmann, G. G. 

 De Bord, W. F. Duncan, L. D. Elliott, H. W. Houghton, W. R. North, G. C. Swan, and H. B. 

 Switzer. 



= U. S. Dept. Agr., Bur. Chem. Circ. 98 (1912); U. S. Dept. Agr. Buls. 51 (1914), 224 (1916), 39 

 (1918), 663 (1918). 



153352°— 20-Bull. 840 1 



