There are two forms of glutamate. Glutamate exists in the "bound" form as a part of protein, along with other amino acids. It can also be found in the "free" form in plant and animal tissues. It is free glutamate which plays a role in the palatability and acceptability of foods. Foods which contain high levels of free glutamate, such as cheese and ripe tomatoes, are often chosen for their distinctive and enjoyable flavors.glutamic acid (or glutamate).