2.4. Measurement of color
The color of apple slices was measured with a Minolta Chroma
Meter Model CR-300 (Minolta. Tokyo, Japan). The degree of browning
was expressed as L-value and a value. The parameter ‘L’ is a measure of
brightness/whiteness that ranges from 0 to 100 (white if L= 100,
black if L= 0). The parameter ‘a’ is an indicator of redness that varies
from −a* to+a* (−a= green, a= red). The results were expressed as
a mean value from three replications of the 10 measured samples.