Jt. Fan et al., PHYSICOCHEMICAL CHANGES IN STARCH DURING DEEP-FAT FRYING OF A MOLDED CORN STARCH PATTY, Journal of food processing and preservation, 21(6), 1997, pp. 443-460
Corn starch patties with an initial moisture content of 46.5% (wet bas
is) were fried in oil at 165C, The results indicated that oil content
in the patty ranged from 10.6 to 12.5% in the crust region, and 1.5 to
3.9% in the core region. Starch gelatinization was significantly depe
ndent on frying time and location of starch in the patty. Both, water
absorption and water solubility indices of starch increased with fryin
g time, with the starch contained in the crust exhibiting much higher
water absorption ability and water solubility than that contained in t
he core region. Measurements of 'blue value' (the intensity of blue co
lor of starch solution upon addition of iodide ion) and the absorbance
spectra of starch samples indicated that amylose-lipid complexes were
present in the fried materials. The degree of starch complexation was
10.9 to 13.2% in the crust and 0.3 to 6.6% in the core region. The pu
ncture force on the surface of a food fried for no more than 5 min was
close to that in the food center, although a significant increase in
force was required for the crust region during the later stages of fry
ing.