Impact of high hydrostatic pressure treatment on the resistant starch content of wheat starch

The impact of high hydrostatic pressure-induced gelatinisation of wheat starch suspensions on its resistant starch (RS) content was examined. Optimum process parameters determined for the enhancement of RS yields in pre-tests differed from process conditions for high RS yields after thermal gelatinisation found in literature. This indicated differing gelatinisation and RS formation processes. Nonetheless, a RS enhancement by high hydrostatic pressure treatment was possible. The highest yields of RS in pressure-gelatinised starches were obtained after ten pressure-annealing cycles of acid hydrolysed wheat starch suspensions (approx, 12%). In comparison to heat-gelatinised wheat starch, the RS yields achieved after pressure-induced gelatinisation of wheat starch were in the same range. Thus, high pressure treatment alone is not superior over thermal treatment for the production of RS in wheat starch.