Glutamine-rich peptides as air entraining agents in building material compounds

1. A method of entraining air in a hydraulically curable building material, comprising:

utilizing a glutamine-rich peptide or peptide mixture as an air entraining agent in the hydraulically curable building material;

wherein the peptide or peptide mixture contains at least 16 wt.% of glutamine, based on the total mass of the peptide or of the peptides in the peptide mixture.

2. The method according to claim 1 , further comprising:

obtaining the glutamine-rich peptide or peptide mixture by enzymatic hydrolysis from proteins.

3. The method according to claim 1 , further comprising:

obtaining the glutamine-rich peptide or peptide mixture by enzymatic hydrolysis from plant proteins.

4. The method according to claim 1 , further comprising:

obtaining the glutamine-rich peptide or peptide mixture by enzymatic hydrolysis from a protein selected from the group consisting of wheat protein, maize protein, amaranth protein, and quinoa protein.

5. The method according to Claim 1 ;

obtaining the glutamine-rich peptide or peptide mixture by enzymatic hydrolysis from wheat protein.

6. The method according to claim 1 ;

wherein the glutamine-rich peptide or peptide mixture has a molecular weight distribution between 203 and 100,000 g/mol.

7. The method according to claim 6 ;

wherein the glutamine-rich peptide or peptide mixture has a molecular weight distribution between 500 and 50,000 g/mol.

8. The method according to claim 7 ;

wherein the glutamine-rich peptide or peptide mixture has a molecular weight distribution between 1,000 to 20,000 g/mol.

9. A method of entraining air in a hydraulically curable building material, comprising:

utilizing a composition, comprising at least one peptide comprising at least 16 wt.% of glutamine based on the total mass of the peptide, as an air entraining agent in the hydraulically curable building material.