Effect of pH on the activity of ryegrass Lolium multiflorum proteases

Shirley J.E. Heron*, R. Alun Edwards, Patricia Phillips

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)


The effect of pH on plant protease activity was investigated using buffered, gamma‐irradiated aqueous extract of ryegrass Lolium multiflorum. Rapid protein breakdown occurred in the first few days but was followed by a longer period of reduced activity. The overall pH optimum for ryegrass proteases was between 5·0 and 7·0 but there was still considerable activity at the acid pH levels found, eg in silage. Proteolysis did not proceed to completion even when the pH was not inhibiting.

Original languageEnglish
Pages (from-to)267-277
Number of pages11
JournalJournal of the Science of Food and Agriculture
Issue number3
Publication statusPrint publication - 1989


  • pH
  • proteases
  • Ryegrass


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