... stop heating , add ammonium persulfate, and stirred for 15 minutes. When the temperature dropped to 50 ° C, incubated ... for 10 minutes to carry on the oxidation reaction; continue heating ... raised to 85-90 ° C, incubated for 20 minutes; added diluted with water, the temperature at about ... 1000:4 c.The starch pasting concentration is 10-15% use concentration is 8-12%. 2. PH ...