i think histamine level was increases Because of the presence of enzymes produced by microorganisms used in the process of ripening and started working on the decomposition of proteins and amino acids .
Yes. Histamine level increases during the ripening of cheeses. Increasing of histamine level is because of secondary proteolysis in cheese. This depends on cheese type, time of ripening, types of starters used in cheese. By increasing ripening time and numbers and types of strains in cheese, the level of histamine will increase.