Describe the LTLT pasteurization method and its typical conditions.

Describe the LTLT pasteurization method and its typical conditions.

• A. 60°C (140°F) for 60 minutes
• B. 63°C (145°F) for 30 minutes
• C. 72°C (161°F) for 15 seconds
• D. 63°C (145°F) for 60 minutes

Answer: (B)

Low-temperature, long-time pasteurization (LTLT) is a batch process that heats milk to a moderate temperature and holds it there long enough to inactivate pathogens while trying to preserve quality. The standard conditions are heating to about 63°C and maintaining that temperature for 30 minutes, followed by rapid cooling to refrigeration temperatures. This longer exposure at a lower temperature provides effective microbial reduction without the higher heat that can more noticeably affect flavor and nutrients. In contrast, high-temperature short-time pasteurization uses about 72°C for 15 seconds, so the 63°C for 30 minutes option best matches the LTLT protocol.

Low-temperature, long-time pasteurization (LTLT) is a batch process that heats milk to a moderate temperature and holds it there long enough to inactivate pathogens while trying to preserve quality. The standard conditions are heating to about 63°C and maintaining that temperature for 30 minutes, followed by rapid cooling to refrigeration temperatures. This longer exposure at a lower temperature provides effective microbial reduction without the higher heat that can more noticeably affect flavor and nutrients. In contrast, high-temperature short-time pasteurization uses about 72°C for 15 seconds, so the 63°C for 30 minutes option best matches the LTLT protocol.