Tomato pomace powder as a raw material for ketchup production

Abstract

A value-added ketchup from tomato pomace powder was developed and compared to a previously developed ketchup from fresh tomato pomace. The total dietary fiber content of tomato pomace powder ketchup was higher than fresh tomato pomace ketchup due to the production process in which no seeds were removed. Differences in processing led to larger specific surface area of rehydrated tomato pomace powder particles when compared to fresh tomato pomace particles and consequently their larger bonding affinity to polysaccharides. The pomace powder ketchup had a significantly higher yield stress and pronounced thixotropy in comparison with fresh tomato pomace ketchup that could not be packed into tubes. Additionally, improved thermal stability of ketchup prepared from tomato pomace powder suggested its possible application as a bakery filling. However, this promising procedure requires more expensive processing equipment and higher energy consumption than fresh tomato pomace processing.