Effects of temperature, concentration of NaOH solutions and immersion
time on caustic peeling of apples were studied. NaOH solutions of 6, 9
, 12 and 15% were heated to 60, 70, 80, and 90 degrees C at various im
mersion times were used, until more than 98% peeling was achieved. Tem
perature of caustic solution versus immersion time plot showed a linea
r trend. Concentration of the caustic solution changed linearly with r
espect to immersion time. Increase in both temperature and concentrati
on reduced the immersion time needed for efficient peeling.