ANALYSIS OF FLOUR. 2? 



13. TO TEST FOODS FOR MINERAL 

 SUBSTANCES. 



Materials: Piece of meat, oatmeal, egg, milk; spoon or piece of 

 metal (platinum foil is best). 



A. Method of testing for mineral matter. 



Place a bit of dried meat on a spoon or on 

 platinum foil, and let it burn on a hot coal fire 

 or over a gas-flame until no further change 

 can be brought about by heat. 



1. What is the appearance of the substance 



which is left behind? (The ash is the 

 mineral substance.) 



2. Does heat affect this residue? 



B. In the same way test oatmeal, egg, and milk. 



What do you learn in regard to the presence 

 of mineral substances in these foods? 



14. ANALYSIS OF FLOUR. 



Materials: Flour, water; concentrated nitric acid and ammonia, 

 iodine, Fehling's solution; cotton cloth, test-tubes, glass dish, piece 

 of metal (platinum foil is best). 



Moisten some flour with water until it forms a 

 tough, tenacious dough; tie it in a piece of cotton 

 cloth, and knead it in a vessel containing water. Set 

 aside the dish with the water. 

 A. Gluten. 



i. What are some of the characteristics of the 

 substance (principally gluten) within the 

 cloth? Draw it out into threads. 



