78 



MASS. EXPERIMENT STATION BULLETIN 151. 



Acetyl Number on Acetylated Product. {Benedikt and Ulzer, and Lew- 



kowitsch Methods.) 



Glycerides. 



Monoglycerides. 



Monopalmitin, 



Monostearin, 



Monolein, 



(CioHsiCOO) (CH.iCOOoCsHs, 

 (CiTHa.'iCOO) (CH,;C00)2C.iHr„ 



(C17H33COO) (CH3COO)2C3H5, 



.0036923 

 .0039421 

 .0039242 



Diglycerides. 



Dipalmitin, 

 Distearin, 

 Diolein, . 



(Ci,5H3iCOO)2(CH3COO)C3H5, 

 (Ci-H36COO)2(CH3COO)C3H5, 

 (Ci-H33COO)2(CH3COO)C3H5, 



.0108819 

 .0118811 

 .0118092 



Resume. 

 The acetyl numbers of a fat and of the insoluble acids afford valuable 

 information relative to the nature and the quality of a product. Appar- 

 ently many analysts have been deterred from making the determinations 

 on account of the time required, tedious manipulation involved or inability 

 to interpret the results. The proposed method is comparatively short 

 and simple and readily understood because of its similarity to other fat 

 methods in common use. It is practically free from the objections cited 

 for the earlier methods, and the results are directly comparable with other 

 fat determinations, being on the same basis. 



