นาถชนก คูณแก้ว. Effects of Relative Humidity and Roasting Temperature on Cooking Yield and Quality of Chicken Breast. Master's Degree(Food Engineering). King Mongkut's University of Technology Thonburi. KMUTT Library.. : King Mongkut's University of Technology Thonburi, 2009.
Effects of Relative Humidity and Roasting Temperature on Cooking Yield and Quality of Chicken Breast
Abstract:
The objective of this work was to study the effects of relative humidity and temperature
on cooking loss and textural property of low-sugar marinated chicken breast during
roasting. An electric convection oven with the dimensions of 540x425x390 mm was
used. From the preliminary results, the roasting conditions were selected from the
controllable ranges of 22.04-29.61% RH at lOO C and 120 C, 11.18-15.81% RH at
120 C and 140 C as well as 6.79-9.92% RH at 140 C and 160 C. The roasting
conditions were therefore divided into 6 conditions; the experiments were conducted in
triplicate. Two criteria were chosen to end the process, that is, core temperature of the
sample (not less than 80 C) and surface color of the roasted sample (based on
HunterLab scale: L=58.51-64.51, a=5.31-8.73 and b=14.61-20.0). The results showed
that the cooking time was controlled by the development of the surface color and varied
in the range of 0.43-1.34 h, depending on the roasting temperature and the relative
humidity levels. Higher temperature and lower relative humidity resulted in shorter
cooking time. It was observed that the surface temperature of the sample rapidly
increased and reached the dew point within the first 2-3 minutes without condensation.
The surface temperature then plateaued above the wet-bulb temperature of the steam-air
mixture in the oven prior to gradually approaching the dry-bulb temperature. As soon as
the process started weight loss occurred and was affected by the temperature and the
relative humidity. It was found that an increase in the temperature and a decrease in the
relative humidity significantly resulted in lower weight loss (P<0.05). The sample shear
force tended to increase with the temperature, but tended to decrease with decreased
relative humidity.