1. Peeling and cutting The mature white lotus root is selected. Its yield is high and the color is white. The product has a flat appearance and no shrinkage on the surface. Peel it mechanically or manually. Export products are best peeled manually, it is better than mechanical peeling to control quality. When cutting, the oysters should be cut according to the requirements, and the size of the moromi block used for soup should be 3 cm and 5 cm.
2. Color protection soaking Dehydration and dehydration dry browning occurs mainly in the peeling, cutting, drying before drying to a moisture content of 30% -40%, so when peeling, dicing must be soaked in Color protection solution in color protection. The color protection solution is mainly composed of sodium sulfite (0.1%), calcium chloride (0.155%) and citric acid commission to adjust the pH value to 3-4. Soaking time is controlled at 3 still) clocks.
3. Blanching and rinsing The mash is soaked in boiling water for 3 to 5 minutes to inactivate the enzymes, control the enzymatic browning, and then hang the pulp. The slurry is composed of a color-protecting solution plus 5% of starch. Starch is pure starch and modified starch is better. The reason for the hanging pulp is that the drying time is long, and the browning mainly occurs in the moisture content of 30% to 40%, and the sulfite will decompose when heated; if the pulp is not hung, when it is dried to a moisture content of 30% to 40%, Sulfite has been decomposed and does not control browning. If the amount of sulfite is increased, the residual sulfur dioxide in the product will be exceeded. Through hanging pulp processing, starch absorbs sulfite adsorption inside, controls release, slows down the rate of decomposition, achieves the effect of preventing browning, and the starch does not have any adverse effect on the quality of the product.
4. Drying uses medium-temperature and medium-speed drying to ensure that the product surface is smooth and there is no shrinkage. The temperature is controlled at 70~12 and takes 5 hours. The use of steam heating is best, hot air stove can also be used to supply hot air.
5. Dehydration and drying quality indicators (1) white, uniform inside and outside. (2) No odor. (3) Complete block shape, uniform size, no shrinkage and deformation on the surface. (4) The moisture content is not more than 30%. (5) The sulfur dioxide content is not more than 1.5 mg/kg. (6) Rehydration is good.
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