XV, 5 
Perkins : Rancidity of Coconut Oil 
467 
absorbing oxygen. A sample of oil B which had been sealed 
and kept in the dark had an iodine number of 6.68. Attention 
is called to the close correspondence between this figure and 
the figures given for the OIB series in Table III, showing the 
remarkable resistance to air and light possessed by the unsat- 
urated glycerides in this oil. 
Table III. — Rancidity tests on storage samples. 
Acidity (as oleic). 
Iodine 
number. 
Fuchsine 
Oxidiza- 
Sample. 
Rancidity factors. 
Original. 
Final. 
Differ- 
ence. 
aldehyde 
reagent. 
bility 
value. 
Odor. 
1 Sd 
Per cent. 
0.37 
Per cent. 
0. 62 
Per cent. 
0. 25 
6.93 
i 
0.6 
2 
2 Sd... 
s, m 
0. 37 
0. 88 
0.51 
6. 94 
i 
0.6 
2 
3 Sd 
s, i, m, n . 
0.37 
0. 79 
0.42 
6. 90 
i 
1.3 
2 
4 Sd. 
0. 62 
0. 63 
0. 11 
6. 92 
i 
1.0 
1 
5 Sd ___ 
m 
0.52 
0. 88 
0.36 
6.93 
i 
1.3 
2 
6 Sd... 
m, n 
0.55 
0.81 
0.26 
6. 90 
i 
1.4 
2 
1 SI— 
1, s 
0.37 
0.66 
0.29 
6. 86 
i 
0.7 
2 
2 SI— . 
1, e, m 
0.37 
1.09 
0.72 
6.93 
i 
0.6 
3 
3 SI— 
1, s, i, m, n 
0.37 
0.85 
0. 48 
6.88 
i 
0.9 
2 
4 SI- 
1 
0. 52 
0. 64 
0. 12 
6. 92 
i 
0.8 
2 
5 SI.... 
I, m 
0.52 
1.03 
0.51 
7.00 
i 
0.2 
8 
6 SI— 
1, m, n 
0. 55 
0.76 
0.21 
6. 95 
i 
0.7 
2 
1 Od 
a, s 
0.37 
0. 97 
0.60 
6.24 
5 
9. 
4 
2 Od— 
a, s, m _ 
0. 37 
1. 11 
0. 74 
6.07 
5 
10. 
4 
3 Od — 
a, 6, i, m, n 
0. 37 
0.96 
0.59 
6. 76 
3 
2. 
4 
4 Od... 
a 
0.52 
0. 86 
0.34 
6. 66 
4 
3. 
4 
5 Od... 
a, m 
0. 52 
0.91 
0. 39 
6.32 
* 6 
7. 
4 
6 Od... 
a, m, n 
0.55 
1.41 
0. 86 
5. 63 
5 
16. 
4 
1 Ol... 
a, 1, s 
0.37 
1.73 
1.4 
5.21 
5 
18. 
5 
2 Ol ... 
a, 1, s, m _ _ _ . 
0.37 
1.84 
1.6 
• 5.20 
6 
17. 
5 
3 Ol... 
a, 1, s, i 0 m, n 
0. 37 
1. 74 
1.4 
5.22 
5 
18. 
5 
4 Ol ... 
a, 1 
0. 52 
1.55 
1.0 
5.36 
5 
21. 
6 
5 Ol ... 
a, 1, m ..... 
0.52 
1.56 
1.0 
5.38 
5 
20. 
5 
6 Ol ... 
a, 1, m, n 
0. 55 
2. 15 
1.6 
4.97 
5 
18. 
5 
1 OIB.. 
a, 1, s 
0.1 
0. 15 
0. 05 
6.71 
2 
0.0 
1 
2 OIB.. 
a, 1, s, m . __ 
0.1 
0. 11 
0.01 
6.69 
3 
1.1 
2 
3 OIB.. 
a, 1, s, i, m, n 
0.1 
0.21 
0. 11 
6.66 
1 
0.0 
i 
4 OIB.. 
a, 1 
0.1 
0. 11 
0.01 
6. 68 
1 
0.5 
i 
5 OIB.. 
a, 1, m 
0.1 
0. 11 
0. 01 
6.61 
2 
1.0 
i 
6 OIB.. 
a, 1, m, n 
0.1 
0. 18 
0.07 
6.67 
i 
1.1 
i 
Fuchsine aldehyde reagent . 1 " — Two grams of fuchsine were 
dissolved in 100 cubic centimeters of cold saturated aqueous 
solution of sulphur dioxide. This solution was allowed to stand 
several hours and then diluted to 2,000 cubic centimeters. 
10 Mullikin, Samuel Parsons, Identification of Pure Organic Compounds 
1 ( 1905 ) 15 . 
