16608
The rate of TNF - alpha degradation and its adsorption ( on boehmite and on the walls of wells ) were determined in cell - free conditions by adding a known TNF - alpha concentration ( 1500 pg / ml ) under various experimental conditions .
 Chemical: boehmite
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: boehmite