Residue (chemistry)

Residue may be the material remaining after a process of preparation, separation, or purification, such as distillation, evaporation, or filtration.

Toxic chemical residues, wastes or contamination from other processes, are a concern in food safety.

The most common food residues originate from pesticides, veterinary drugs, and industrial chemicals.

Similar to the food industry, in environmental sciences residue also refers to chemical contaminants.

In biochemistry and molecular biology, the term residue refers to a specific monomer within the polymeric chain of a polysaccharide, protein or nucleic acid.