Under- and Over-cooked Starch Pastes
It is essential to reach gelatinization temperature during processing to ensure that the texture benefits of the starch are realized. The two exceptions to this rule are the use of pregelatinized starch and the use of starches in cook-up mixes, where the consumer will adequately cook the mix at home.
When foods are heat treated to pasteurization temperature (75° C), unless the proper starch is selected, the starch paste in the food system may be under-cooked, resulting in a cloudy, thin product. If foods are held at elevated temperatures for extended times, as may be the case in a kettle cook prior to filling, the starch may be over-cooked. This may result in a product with an undesirably, long cohesive texture.
If the heat processing temperature of a food system cannot be raised without risking damage to certain delicate ingredients, then under-cooking of the starch may be rectified by pre-cooking a starch slurry before blending in other ingredients. Over-cooking of starch may be avoided by using a more cross-linked, process tolerant starch. (Fig. 16).
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