Mamtek incorporated filed for chapter seven bankruptcy last week.  The Chinese artificial sweetener company was involved in several Missouri lawsuits after the factory fell through.  It had claimed it would bring more than 600 jobs to the Moberly area.  The City had issued $39 million in bonds for the project, and city officials now claim they will default on the bonds.  The Federal Securities and Exchange Commission and Missouri attorney general have both launched investigations into Mamtek.