c 

 O 



a 



03 



o 



u 



1,2 3 5 7,8 



151617 



I 



J L 1 I 1 



4 8 12 16 20 24 28 

 Time (min.) 



8 /min. M Isothermal 



50 220 

 Temperature (°C.) 



Figure IS. — Ckromatograms of DMSO and base xylan treated with 9 -percent sodium hydroxide 

 (see figure 14 for peak identification) . 



23 



