摘要：Effects of temperature, concentration of NaOH solutions and immersion time on lye peeling of walnuts were studied, optimum time- temperature- concentration relations were analyzed mathematically. Experiments were carried out for NaOH solutions of 6, 9, 12, and 15% at 55, 65, 75, and 85°C for various immersion times, until more than 98% peeling was achieved. The time-temperature, and time-concentration correlations were exponential. Very good peeling (higher than 98%) was achieved for all temperatures except 55°C, and brown colour formation was observed on the surface of walnuts. The effect of lye peeling on the quality of walnuts were also observed. Color and appearance were selected as quality parameters. Peeling time other than concentration and temperature was found to be the most important factor affecting peeling. However, it was observed that concentration of lye solution was the main effect on the quality of walnuts. Treatment with 12 % NaOH at 85°C for 7.5 minutes was found to be optimum to peel the walnuts, mathematically.
