Ropiness in Bread-A Re-Emerging Spoilage Phenomenon

Area of Science:

• Food Science
• Microbiology
• Food Security

Background:

• Ropy bread spoilage is a significant concern for staple food security, characterized by sticky, stringy crumb degradation and off-odors.
• Consumer demand for preservative-free products and climate change may exacerbate ropy spoilage.
• Contamination by various Bacillus species is unavoidable due to their presence in wheat and heat-stable endospores.

Purpose of the Study:

• To provide a comprehensive overview of ropy bread spoilage.
• To identify bacterial species responsible for ropiness.
• To explore factors influencing spoilage and methods for assessing bacterial rope-forming potential.

Main Methods:

• Review of existing literature on ropy bread spoilage.
• Identification of bacterial species associated with ropiness.
• Analysis of factors affecting rope development.
• Summary of methods for assessing bacterial rope-forming potential.

Main Results:

• Multiple Bacillus species, including Bacillus amyloliquefaciens and the Bacillus cereus group, are implicated in ropy bread spoilage.
• Heat-stable endospores of Bacillus species survive baking, leading to unavoidable contamination.
• Current knowledge on spoilage mechanisms and effective control strategies is limited.

Conclusions:

• Understanding the routes of Bacillus endospore entry into bread is crucial.
• Further research is needed to elucidate spoilage mechanisms and develop effective interventions.
• Development of high-throughput screening tools for rope-forming bacteria is essential.