Journal of the American Oil Chemists' Society

, Volume 90, Issue 10, pp 1577–1587 | Cite as

The Role of Peracetic Acid in Bloodmeal Decoloring

  • Talia M. Hicks
  • C. J. R. VerbeekEmail author
  • M. C. Lay
  • M. Manley-Harris
Original Paper


Hydrogen peroxide (HP) can degrade soluble heme, forming yellow or colorless degradation products. Thermal treatment during bloodmeal production changes the conformation of oxyhemoglobin trapping heme in hydrophobic protein regions or forms methemoglobin (metHb) heme which catalytically removes HP. As a result, HP can only degrade a portion of the heme present in bloodmeal leading to poor decoloring. Equilibrium peracetic acid (PAA) solutions can effectively decolor bloodmeal. This work assessed the ability of PAA to decolor bloodmeal and the mechanism by which it occurs. The inability of HP to decolor bloodmeal is determined by the fact that it is unable to permanently degrade metHb heme, or hydrophobically trapped heme. Addition of organic acids to HP led to significant swelling of the protein chains but also to poorer decoloring and lower HP consumption compared to PAA. This suggested that in the case of PAA solutions, where bleaching was facile, the reason PAA solutions are capable of decoloring bloodmeal was due to the action of the PAA molecule against heme, whereas HP and acetic (ethanoic) acid played only minor roles in total bleaching. The decolored protein powder has reduced odor and whiter color, and is suitable for applications such as bioplastics.


Co-products (Waste) Biobased products, protein extraction and processing Processing technology 



The authors would like to acknowledge Wallace Corporation Ltd. for their continued support. Talia Hicks was supported by a University of Waikato Doctoral Scholarship and the New Zealand National Agricultural Fieldays Sir Don Llewellyn Scholarship.


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Copyright information

© AOCS 2013

Authors and Affiliations

  • Talia M. Hicks
    • 1
  • C. J. R. Verbeek
    • 1
    Email author
  • M. C. Lay
    • 1
  • M. Manley-Harris
    • 2
  1. 1.School of EngineeringFaculty of Science and Engineering, University of WaikatoHamiltonNew Zealand
  2. 2.Department of ChemistryFaculty of Science and Engineering, University of WaikatoHamiltonNew Zealand

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