17997
In our study , biocompatible Ni ( II ) - nitrilo ( triacetic acid ) - modified poly ( ethylene imine ) - maltose ( Ni - NTA - DG ) is realized and evaluated as complexation agent against His - tagged peptides using fluorescence polarization and dynamic light scattering .
 Chemical: Ni ( II ) - nitrilo ( triacetic acid ); Chemical: poly ( ethylene imine ) - maltose; Chemical: Ni - NTA - DG; Chemical: His
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: Ni ( II ) - nitrilo ( triacetic acid ); Chemical: poly ( ethylene imine ) - maltose; Chemical: Ni - NTA - DG; Chemical: His