(2) Hydrolysis extraction: Add water to the dried raw material (generally water is 15 times the mass of the raw material), adjust the pH of the aqueous solution with hydrochloric acid to 1.6-6.3, heat to 75°C, keep at constant temperature for 1 hour, and hold for 18 hours. The raw material glue is hydrolyzed into pectin, dissolved in solution, and then filtered to obtain a transparent solution. The filter residue was further added with 5 times the mass of the hydrochloric acid solution (the pH was the same as the first hydrolysis) and kept at a temperature of 95° C. for 15 minutes. The juice was then squeezed and the two liquids were combined and filtered.
(3) Precipitation: In the hydrolysis filtrate, 40% aluminum trichloride of raw material mass is added, and the temperature is kept at 40°C. While stirring, 2 mol/l sodium hydroxide solution is added, and the pH is adjusted to 4 to make pectin. Aluminum precipitated.
(4) Dissolve after washing and acidification: The precipitated pectin aluminum is washed several times with hot water of 70-80°C to remove water-soluble impurities, and pectin aluminum is dissolved with dilute hydrochloric acid.
(5) Re-precipitation: Ethanol solution was added to the solution, pectin was precipitated again, and ethanol was recovered after filtration. The precipitate was washed with ethanol several times.
(6) Drying: Vacuum drying is performed at a temperature of 70°C, and dried for about 8 hours to obtain a finished pectin product. Pure pectin is usually light yellow or brown and is high methoxy pectin.
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