University of Otago Secures Grant to Combat Meat Spoilage

Researchers at the University of Otago have received a significant boost to their project aimed at reducing food spoilage in the red meat industry. A grant of $1 million from the Ministry of Business, Innovation and Employment will allow them to explore the potential of peptides in a spray designed to combat bacterial contamination and spoilage in meat products.

The red meat sector in New Zealand plays a crucial role in the economy, contributing approximately $10.8 billion annually and accounting for about 15% of the nation’s total export earnings. Despite its economic importance, up to 1% of red meat exports are returned or rejected due to issues related to bacterial spoilage, leading to financial losses in the tens of millions each year.

Understanding Biofilms and Peptides

Associate Professor Daniel Pletzer, a microbiologist at the university, explained that bacteria often form “biofilms” on meat products. These biofilms consist of dense clusters of microbial cells that create a protective barrier against environmental threats, including temperature variations and moisture. Once established on items like unwrapped steak, these bacteria can thrive, breaking down the meat and leading to visible spoilage.

Conventional cleaning methods and antibiotics are often ineffective against these stubborn biofilms. To address this challenge, Assoc Prof Pletzer and fellow researcher Dr. Sam Wardell are investigating a novel approach using peptides. These tiny molecules, composed of short chains of amino acids, are essential for numerous biological functions, including immune response and tissue repair.

“As soon as we encounter a virus, parasite, or bacteria, the first thing our bodies do is produce functional peptides to fight them off,” said Assoc Prof Pletzer.

Innovative Solutions for the Meat Industry

After learning about specific peptides, Pletzer and Wardell recognized the potential to apply their findings to the red meat industry, collaborating with the major cooperative, Alliance Group NZ. Their innovative solution involves developing a spray that targets biofilm-forming bacteria, which can be applied directly to meat during processing.

To identify the most effective peptides, the research team has initiated a search for host defence peptides (HDPs) that can effectively fight spoilage. Utilizing artificial intelligence and computational algorithms, the researchers have sifted through vast genetic data from cattle and sheep, narrowing down their options from thousands to approximately 400 candidates, which are now undergoing synthesis for testing.

The team is currently screening these peptides against common spoilage-causing bacteria, including E. coli and Listeria, as well as beneficial bacteria like Lactobacillus. The goal is to discover a peptide or a combination of peptides that can effectively target harmful bacteria without harming beneficial strains.

If successful, this research could have far-reaching implications beyond meat production. Potential applications may include treating farm equipment to prevent diseases such as mastitis or enhancing medical devices to minimize contamination. Pletzer also highlighted the broader impact of this work, contributing to the global initiative to reduce reliance on chemical cleaners and broad-spectrum antibiotics, which have been linked to the rise of antibiotic-resistant bacteria.

The research from the University of Otago represents a promising step toward enhancing food safety in the red meat industry while addressing broader health concerns associated with antibiotic use. As the team continues their research, the outcomes could redefine approaches to food preservation and safety.