Isolation of theobromine from chocolate

[Zami'87]

Hi there!I read a story about a dog who died from eating too much chocolate. I know that chocolate is toxic but I thought maybe I could somehow isolate theobromine from differents kinds of chocolate and deduce which kind is the most toxic.
But there is a problem:nobody knows how to isolate theobromine from chocolate(even some University professors!).Please help(books, sites ,PROTOCOLS).Thanks! Jana :oops: