Cysteine/glycine rich peptides

A method for the preparation of a mixture of peptides having a total cysteine and glycine content of 7-20 w/w % from a protein source, comprising one or more cysteine-containing and glycine-containing proteins, comprising:

• a) cleaving the cysteine-containing and glycine-containing protein into peptides;
• b) digesting the peptides by at least one exopeptidase, wherein the exopeptidase is at least attenuated at a cysteine or a glycine in the peptide and
• c) purifying the digested pep tides.

A preparation comprising a mixture of cysteine-rich peptides, which comprise 7-20% w/w cysteine, wherein said peptides have a molecular weight of 5000 Da or more.

A preparation comprising a mixture of cysteine-rich peptides, which comprise 7-20 w/w % cysteine, wherein at least 80% of the peptides comprise a terminal cysteine, terminal glycine, or a combination of both.

A food comprising a preparation comprising a mixture of cysteine-rich peptides, which comprise 7-20 w/w % cysteine.

A pharmaceutical composition or medicament comprising a preparation comprising a mixture of cysteine-rich peptides, which comprise 7-20 w/w % cysteine.

A preparation comprising a mixture of cysteine- and glycine-rich peptides, which comprise 7-20% w/w cysteine and glycine, wherein said peptides have a molecular weight of 5000 Da or more.

A preparation comprising a mixture of cysteine- and glycine-rich peptides, which comprise 7-20 w/w % cysteine and glycine, wherein at least 80% of the peptides comprise a terminal cysteine, terminal glycine or a combination of both.

A food comprising a preparation that comprises a mixture of cysteine and glycine-rich peptides, which corn rise 7-20 w/w % cysteine and glycose.

A pharmaceutical composition or medicament comprising a preparation comprising a mixture of cysteine- and glycine-rich peptides, which comprise 7-20 w/w % cysteine and glycine.