Sweet potato leaf processing method
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Sweet potato leaves are rich in protein, vitamins, and minerals, and have functions such as enhancing immune function, improving the body's resistance to disease, promoting metabolism, and delaying aging. The following describes the processing points of two sweet potato leaf products. First, the sweet potato leaf health tea (a) the process of raw material selection → cleaning → chopping → fixing → drying → ingredients → crushing → sieving → packaging → finished products. (b) Processing Points 1. Selection and treatment of raw materials Fresh and tender sweet potato leaves with good varieties and ripeness were selected. Old leaves, yellow leaves, worm-eaten leaves and rot-leafed wounded leaves were removed. Bundles were not immersed in water when harvesting, and were packed and transported in a timely manner in special plastic baskets. Remove the petiole and wash the dirt, dust and other dirt on the sweet potato leaf with water and drain the water. Then use a machine or hand-rolled into small 0.5 cm square pieces. 2. Fixing with basil, dried tangerine peel as medicine. After drying, making the system, the juice is packaged after being wrapped in gauze. Then, the killing liquid was sprayed on the potato leaves at a weight ratio of 1.25% to passivate the polyphenol oxidase. 3. Drying The sweet potato leaves that have been treated above are dried in a drying room at 25-40°C for 28-30 hours. 4. Tea revived on the market, tea is generally more water, so it should be put into the frying tea in a fire, stir-fry to moisture content of 6%-7%, but also make the tea flavor. 5. The tea was blended in a weight ratio of 59.4% of tea leaves, 40% of sweet potato leaves, and 0.6% of freeze-dried herbs (sprayed on potato leaves). 6. Grinding, sifting, and packaging The crushing of the ingredients is carried out using a crusher. The required particle size passes through 16 meshes and remains on a 60-mesh sieve. The powder should be generated as little as possible and the powder should be removed. The tea packaging machine is packaged into 50-250 g bags, sealed and passed inspection. Second, sweet potato leaf protein concentrate (a) process selection of raw materials → cleaning → chopping → beating → precipitation → dehydration → drying → crushing → finished product. (b) Processing Points 1. The choice of raw materials is to select fresh and sweet potato leaves with good quality and ripeness, and to remove old leaves, yellow leaves, and worm-eaten leaves. 2. Washing and beating Wash the dirt, dust, and other dirt on the surface of the sweet potato leaf with clean water, drain the water, and then chop it and place it in a fruit juicer to squeeze and squeeze the juice in a kneading manner. 3. Agglomerate precipitation and dehydration The pH of the juice is added to the alkali to adjust the ph value to about 8.5, while heating with steam to 85-95°C, so that the protein is sufficiently aggregated and precipitated, and then dehydrated by a centrifuge to obtain concentrated leaf protein. 4. Dry and crush the concentrated leaf protein into glassware, about 0.5 cm thick, put it in an oven at 50-60°C, then dry it, then pulverize it with a grinder and pass through a 80-mesh sieve, then use it as an additive for cakes and other foods. .