4529
Mobile phases with different ion pairing or ionisation agents were tested in different reverse phase columns , and ammonium bicarbonate buffer was found as the best choice to increase the sensitivity of target analytes to the UV detector .
 Chemical: ammonium bicarbonate
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: ammonium bicarbonate 
Answer:
 Chemical: ammonium bicarbonate