Natthapoom Kreapongsak and colleagues (2011) studied the influence of conditions used in spray drying on the properties of sericin powder. By boiling empty silk cocoons in water at a temperature of 95 °C to obtain a concentration of approximately 2% Brix, then using the boiled water to spray dry the cocoons. There are 3 variables used in the study: inlet hot air temperature 100, 120 and 140 °C, volumetric flow rate of inlet hot air 28 and 35 m3/h, and cocoon boiling water feed rate 9 and 12 mL/min, found that the moisture content of the sericin powder decreased. When increasing the temperature and volumetric flow rate of the incoming hot air and reduce the rate of feeding water to boil the cocoons In addition, the rate of feeding the cocoon boiled water also affects the particle size, color, and antioxidant capacity of the sericin powder. If the feeding rate of cocoon boiling water is high, it will result in a powder product that is large, dark in color, and has high antioxidant capacity. However, different drying conditions did not significantly affect the yield of the product (p>0.05).
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