1. a water-soluble protein derivative produced by the partial breakdown of proteins, used in bacterial culture media and nutritional supplements
Usage: biochemistry; microbiology

Examples

• The laboratory technician added peptone to the growth medium to culture the bacteria.
• Peptone provides essential amino acids for microbial growth in petri dishes.
• The recipe for the bacterial broth included peptone, yeast extract, and salt.
• Scientists use peptone-based media to study different strains of microorganisms.
• The peptone was derived from casein through enzymatic digestion.
• Quality control tests ensure the peptone meets standards for laboratory use.