IMPROVED METHODS FOR FAT ANALYSIS. 



105 



substituting the value of N in terms of F and mi 



^ ^ 92.064 ^ 3 mi +38.016 ^ j, 



3 m, +38.016 

 92.064 



3 mi 



3 mi 



XF 



(14) 



The total fatty acids are equal to the sum of the fatty acids in the neu- 

 tral fat and the free fatty acids. 



Percentage of Fatty Acids and Glycerol in Triglycerides. 



Glycerides. 



Formula. 



Fatty 



Acids (Per 



Cent.). 



Glycerol 

 (Per Cent.). 



Acetin, . 



Butyrin, 



Valerin, 



Caproin, 



Caprylin, 



Caprin, 



Laurin, . 



Myristin, 



Palmitin, 



Stearin, 



Arachin, 



Olein, . 



Erucin, . 



Linolin, 



Linolenin, 



Clupanodonin, 



Ricinolein, . 



Dihydroxystearin, 



(CHsCOOsCsHs 



(C3H7COO)3C3H5 



(C4H9COO)3C3H6 



(C6HllCOO)3C3H6 



(C7Hl5COO)3C3H6 



(C9Hl9COO)3C3H5 



(CllH23COO)3C3H6 



(Cl3H27COO)3C3H6 



(Cl6H3lCOO)3C3H5 



(Cl7H35COO)3C3H6 



(Cl9H39COO)3C3H5 



(Cl7H33COO)3C3H5 



(C2lH4lCOO)3C3H5 



(Cl7H3lCOO)3C3H5 



(Cl7H29COO)3C3H5 



(Cl7H27COO)3C3H5 



(Cl7H32.0H.COO)3C3H5 



(Cl7H33(OH)2COO)3C3H5 



82.570 

 87.421 

 88.957 

 90.159 

 91.918 

 93.144 

 94.047 

 94.740 

 95.288 

 95.733 

 96.101 

 95.704 

 96.390 

 95.674 

 95.644 

 95.614 

 95.925 

 96.148 



42.210 

 30.464 

 26.743 

 23.832 

 19.571 

 16.603 

 14.417 

 12.739 

 11.411 

 10.334 



9.443 

 10.405 



8.743 

 10.476 

 10.549 

 10.623 



9.869 



9.329 



Free Fatty Acids. — The acid number (a) can be readily converted 

 into percentage of free fatty acids (A) expressed as oleic, as sulfuric an- 

 hydride (SO3), as an assumed acid with a molecular weight determined 

 by formula (4), or as the acid of any other molecular weight (mg). 



A = 



aXms 

 56108 



(15) 



When the free acid or the predominant acid in a mixture is known it 

 is often desirable to report acidity in terms of that acid. In such cases it 

 is preferable to calculate the percentage directly from the titration by 



