Preparation. Choose a sweet potato that is big, tight in meat, moderate in ripeness, free of mildew, and free from pests and diseases.
Cleaning. After the raw materials are harvested, they should be soaked with fresh water for 1 to 2 hours, and then washed away with sediments and inclusions. The washed potato pieces shall be immersed in 0.01%-0.1% potassium permanganate solution for 5-7 minutes, and finally rinsed with clean water to colorless.
Peel. Use a peeler to remove the sweet potato skin; use a 3% sodium hydroxide solution for 10 minutes and then rinse, peel, and rinse with flowing fresh water to remove the sodium hydroxide solution.
Color protection. Immediately after peeling the sweet potatoes, protect the skin with a mixture of 1% to 1.5% salt and 0.1% citric acid.
Cut out. First, the crude fiber at both ends of the sweet potato was partially excised, cut into 6 to 8 cm sections, and cut into long strips of 6 to 8 cm in width and 1.5 cm in width. It can also be cut into slices, strips, squares or circles.
Precooked. Precooked with 0.1%-0.2% citric acid and 0.1%-0.5% calcium chloride solution, the ratio of potato block to pre-cooked liquid is 1:1.2, boiled 2-3 Minutes, cooked with potato chips. Cool immediately with water after cooking. Clean the skin and spots, and select boiled or discolored pieces.
Sugar water. To prepare a sucrose solution with a concentration of 34%, 0.3% to 0.4% of citric acid and 0.2% to 0.3% of calcium chloride should be added in the sugar water to improve the flavor and hardness of the product.
Canning. According to the size and color of potato tube cans respectively. If it is a 500-gram glass bottle, the filling amount per can is: 270-280 grams of potato meat, 220-230 grams of sugar water, and a net weight of 500 grams. The upper part of the tank must maintain a certain gap.
exhaust. Heating exhaust, exhaust temperature is 85 ~ 95 Â°C, time is 8 to 10 minutes, the tank center temperature is 75 ~ 85 Â°C. Sealed with a vacuum sealer, vacuum 400 ~ 450 mm Hg.
Sterilization. Sterilize quickly after sealing. In 5 minutes quickly heated to 100 Â° C, 100 Â° C temperature thermostatic sterilization for 60 minutes, and then sub-cooled to room temperature in 6 minutes, after passing inspection.
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