Common Filler Ingredients in Ground Coffee (image) American Chemical Society Share Print E-Mail Caption A new test could detect unwanted fillers like wheat, corn and soybeans that might be lurking in your cup of coffee. Credit American Chemical Society Usage Restrictions Please credit the American Chemical Society for all uses. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.