使用Json.NET序列化时忽略特定的数据类型？

I'm saving JSON objects into the database, sometimes it grows very large (I have an object of length 205,797 characters) I want to eliminate the size as possible as I can. these objects have a lot of GUID fields, all I don't need, It may help eliminating the size if there is a way to ignore any GUID type from serializing.I'm saving JSON objects into the database, some