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Alternative strategies for activation of the natural lactoperoxidase system in cows' milk: trials in Tanzania

  • Leonard WT Fweja (a1), Michael J Lewis (a1) and Alistair S Grandison (a1)
Abstract

Thiocyanate content and lactoperoxidase activity of individual cow's milk of different breeds were determined, and the effects of different lactoperoxidase system (LP-s) activation strategies were compared. Lactoperoxidase activity varied significantly between Friesian and both Ayrshire and Tanzania Short Horn Zebu (TSHZ), but differences between Ayrshire and TSHZ were not significant. There was no significant variation in SCN content between breeds. The LP-s was activated using three strategies based on SCN: namely; equal concentrations of SCN and H2O2 (7:7, 10:10, 15:15 mg/l), excess SCN concentrations (15:10, 20:10, 25:10 mg SCN:H2O2/l), and excess H2O2 concentrations (10:15, 10:20, 10:25 mg SCN:H2O2/l), plus a fourth strategy based on I (15:15 mg I:H2O2/l). The keeping quality (KQ) was assessed using pH, titratable acidity, clot on boiling and alcohol stability tests. All activation strategies enhanced the shelf life of milk (typically increasing KQ from around 10 to around 20 h), but it was clear that the effectiveness of the LP-s depends on the type and concentrations of the activators of the system. The LP-s activated using I as an electron donor was more effective than the LP-s activated using SCN as an electron donor, increasing the KQ by a further 6–8 h compared with SCN.

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Corresponding author
*For correspondence; e-mail: a.s.grandison@reading.ac.uk
References
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NE Barret , AS Grandison & MJ Lewis 1999 Contribution of the lactoperoxidase system to the keeping quality of pasteurised milk. Journal of Dairy Research 66 7380

EH Bosch , H Van Doorne & S De Vries 2000 The lactoperoxidase system: the influence of iodide and the chemical and antimicrobial stability over the period of about 18 months. Journal of applied Microbiology 89 215224

E Seif , EM Buys & EF Donkin 2005 Significance of lactoperoxidase system in the dairy industry and its potential application: a review. Trends in Food Science and Technology 16 137154

K Shin , H Hayasawa & B Lönnerdal 2001 Inhbition of Escherichia Coli respiratory enzymes by the lactoperoxidase – hydrogen peroxide-thiocyanate antimicrobial system. Journal of applied Microbiology 90 489493

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Journal of Dairy Research
  • ISSN: 0022-0299
  • EISSN: 1469-7629
  • URL: /core/journals/journal-of-dairy-research
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