Abstract: The retrogradation of mung bean starch in ice cream during frozen storage leads to an unpleasant starchy taste. In this study, mung bean starch was treated withα-amylase and the effects of various hydrolysis conditions on retrogradation properties of mung bean starch were investigated using orthogonal array design method. After proper treatment with α-amylase, the unique taste of mung bean was still maintained, and mung bean starch showed high water-holding capacity, good gelatinization properties and significantly lower retrogradation degree compared with native mung bean starch. The optimal hydrolysis conditions were pH 6.5, α-amylase dosage 0.0008% and 70 ℃ for a hydrolysis duration of 8 min. Different levels of enzymatic hydrolysate of mung bean starch, CMC-Na, gelatin, glycerin monostearate (GMS) were added together for manufacturing ice cream and these ingredients were found to have different effects on the swelling rate, melting resistance and taste of ice cream. Ice cream with enzymatic hydrolysate of mung bean starch, CMC-Na, gelatin and GMS added at 60%, 0.1%, 0.1% and 0.15%, respectively showed notably improved taste.

Key words: mung bean starch, anti-retrogradation, α-amylase, sensory evaluation