The effect of blanching and/or glucose impregnation at atmospheric pre
ssure or in vaccum on the kinetics of moisture transfer during the fir
st falling rate period of air drying of apple was analyzed. The moistu
re diffusivity of water (Deff) was strongly decreased by glucose uptak
e during impregnation step as well as volume shrinking Studies of the
cell structure rising transmission electron microscopy revealed that b
oth pretreatments did not modify in a great extension rite cell wall r
esistance to water flux. (C) 1998 Elsevier Science Limited all rights
reserved.