Abstract:

The effects of the degree of substitution of starch ferulate, drying temperature and glycerin content on the tensile
strength and elongation at break of starch ferulate films were optimized by single factor experiments and response surface
analysis. Results showed that tensile strength of starch ferulate films increased and elongation at break of starch ferulate
films decreased gradually with increasing degree of substitution. When the drying temperature was lower than 60 ℃, tensile
strength of starch ferulate films increased slightly with an increase in temperature while when drying temperature was
higher than 60 ℃, both tensile strength and elongation at break of starch ferulate films decreased significantly (P < 0.05).
Tensile strength of starch ferulate films decreased gradually with an increase in glycerin content, whereas elongation at
break increased gradually. Based on mechanical properties, the optimal conditions for preparation of starch ferulate films
with high tensile strength of 10.23 MPa were determined as 0.068, 40 ℃ and 1.20 g/4.0 g starch for degree of substitution,
drying temperature and glycerin content, respectively, while those providing high elongation at break of 321.65% were 0.023,
41 ℃ and 1.30 g/4.0 g starch, respectively.

Key words: starch ferulate films, response surface analysis, tensile strength, elongation at break