Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

The use of novel microbial control techniques

Trisodium Phosphate(TSP), nisin, chilling and boric acid were assessed individually and in conjunction with salt (at reduced offers) to determine their suitability as an alternative preservation method to salt, for the preservation of raw skins.

The results showed that at a TSP concentration of 10%, in addition to either a 10 or 20% salt application, reduced bacteria numbers were observed. The current high commercial cost of TSP would however limit its use in the industry.

Analysis of nisin determined that 0.248µg/cm2 was the most effective nisin load to reduce bacteria numbers and nisin treatment resulted in a 1-1.5 log reduction in bacterial numbers. In addition the trial also determined that nisin and salt offers similar or better protection against bacterial attack compared with salt alone. Nisin seems to be particularly effective against Pseudomonas bacteria species.

The results from analysis of boric acid showed that it was not effective at reducing total bacteria numbers or collegenase producing bacteria.

The effects of temperature control showed that at 37 degrees Celsius bacterial numbers proliferate immediately after slaughter. Reducing the temperature to 20 degrees Celsius provides a window of up to 8 hours before any significant increase in the bacteria. Cooling to 4 degrees Celsius extends this time to in excess of 24- hours.

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Amanda LONG, (Research Scientist)
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