Browsing Food Chemistry & Technology by Subject "Rapid chilling"
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Commercial systems for ultra-rapid chilling of lambThe overall objective was to devise a rapid chilling system for the Irish lamb processing industry. The objective of the first trial was to assess the effect of ultra-rapid chilling in air at - 4ºC, -10ºC and -20ºC and subsequent ageing on the appearance and tenderness of lamb carcasses. The objective of the next trial was to investigate the effect of carcass splitting, which produces faster chilling rates and reduces skeletal constraint of muscles, on the tenderness of rapidly and conventionally chilled lamb. The next task was to compare the effects of immersion chilling and conventional air chilling on meat tenderness and evaporative weight loss in lamb carcasses. The next task was to assess the level of interest in industry. This required costings of the process and a survey of several lamb processors focusing on their perceptions of rapid chilling in general, its advantages and disadvantages, and the implications of adopting the new system. The final objective was to introduce the ultra-rapid chilling process to industry via a factory trial. Lambs were ultra-rapidly chilled and then exported to France for assessment.
Rapid cooling of cooked meat jointsConventional cooling by air-blast or even by immersion in liquid is unlikely to achieve recommended cooling rates when dealing with joints weighing 5kg or more because meat has a low thermal conductivity. The objective was to investigate vacuum cooling as a technique for rapid chilling of cooked meat joints. In vacuum cooling, the food is enclosed in a chamber and reduction of the pressure to about 7 mbar causes evaporation of water from the surface of the food and from cavities in the food. The energy required to evaporate the water is extracted from the food, resulting in rapid chilling
The ultra-rapid chilling of lamb carcassesThe practice in Irish commercial abattoirs is to chill lamb carcasses for a period of approximately 16 hours at 2 - 4°C, at which stage the core temperature of the carcass has reached 7°C. Chilling in this manner is considered necessary because it is generally held that faster chilling leads to toughening of the meat. The objective of this work was to develop a continuous ultra-rapid chilling system for lambs which would reduce carcass chilling time without adversely affecting the quality of the meat.