Difference between Peptone, Peptide and Proteose?

Question

In my school textbook, it is given that Pepsin converts proteins to peptones, proteose and peptides. What is the difference between the three products? On googling the terms, the definition was similar. **Peptone**: a soluble protein formed in the early stage of protein breakdown during digestion.**Proteose**: A proteose is any of various water-soluble compounds that are produced during digestion by the hydrolytic breakdown of proteins short of the amino acid stage.**Peptide**: a compound consisting of two or more amino acids linked in a chain, the carboxyl group of each acid being joined to the amino group of the next by a bond of the type -OC-NH-.Peptide has a different definition, but it can be applied to the other two too as all are degraded proteins but not amino acids.

Answer 1

During digestion

Protein → Proteose → Peptone → Peptides → Amino acids

Each step breaks the protein into progressively smaller pieces.

Easy way to remember

1. Proteose = Large protein fragment (closest to the original protein).
2. Peptone = Medium protein fragment.
3. Peptide = Small chain of amino acids.
4. Amino acid = Single building block.