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10.3 GELATINIZATIONThis section deals with the phenomenon of gelatinization. This is a collectiveterm used to describe a range of irreversible events occurring when starch isstarch, water, and temperature result in gelatinization. A certain minimum levelof water content is necessary, and a certain temperature has to be reached. Thistemperature depends on the starch. The word “gelatinization” seems to implythat gel formation is involved; however, not all combinations of water contentand temperature that are found in the gelatinization area in Figure 10.2 willresult in the formation of a starch gel. The rheological changes during gelatinization are described in a following section. Gelatinization is often describedwith, or related to, a gelatinization temperature. Different methods are used todetermine gelatinization temperatures; therefore, values found in the literaturediffer considerably, even for the same starch. It is then natural to begin thissection with a description of what the gelatinization temperature is.10.3.1 GELATINIZATIONTEMPERATUREThe gelatinization temperature is always a temperature range. For a singlestarch granule in excess water, this temperature range might be 1 to 2°C,whereas for the entire population the range might be 10 to 15°C [80,81]. To© 2006 by Taylor & Francis Group, LLCheated in water; however, as illustrated in Figure 10.2, not all combinations of
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