Microcidal effects of a new pelleting process.

Area of Science:

• Food Science
• Microbiology
• Process Engineering

Background:

• Traditional feed processing methods may not fully eliminate microbial contamination.
• Ensuring feed safety requires effective microbicidal treatments.

Purpose of the Study:

• To evaluate the microbicidal efficiency of a new Anaerobic Pasteurizing Conditioning (APC) System.
• To compare different temperature and moisture measurement methods.
• To assess the impact of pH changes on microbicidal efficiency.

Main Methods:

• Four trials were conducted using the APC System, replacing traditional boiler-conditioners.
• Microbial reduction was assessed against Escherichia coli, non-lactose-fermenters, aerobic mesophiles, and fungi.
• Temperature and moisture measurement methods (on-line probes, near infrared, microwave, in vacuo) were compared.
• pH levels were monitored throughout the process.

Main Results:

• The APC System demonstrated high microbicidal efficiency: 100% against E. coli and non-lactose-fermenters, 99% against aerobic mesophiles, and 90% against fungi.
• Optimal conditioning occurred at 82.9°C and 14.9% moisture for 4.6 minutes.
• On-line temperature probes were accurate; near infrared and microwave moisture measurements were fast but less accurate than in vacuo.
• No significant pH changes were observed during processing.

Conclusions:

• The APC System is highly effective for microbial control in feed processing.
• Accurate temperature monitoring is crucial for achieving desired microbicidal outcomes.
• The APC System offers a viable alternative for enhancing feed safety and quality.