| Name | Natural amaranthus red |
| Synonyms | Natural amaranthus red |
| Molecular Formula | C21H21O11 |
| Physical and Chemical Properties | Chemical properties red to purple red liquid or extract, or powder, easy to absorb moisture. Easily soluble in water and ethanol, insoluble in organic solvents such as absolute ethanol and petroleum ether. The aqueous solution is purplish red when PH4-6, purple when PH is greater than 8, and yellow when PH is greater than 12, which is sensitive to light, heat and metal ions. The oral LD50 of rats is greater than 10 g/kg, the oral LD50 of mice is greater than 10.8 g/kg (female) and greater than 12.6 g/kg (male). |
| Use | Uses as food and feed colorants, China's provisions can be used for all kinds of beverages, wine, candy, plum, Hawthorn products, cakes on the color, red and green silk, dyed cherry canned (Department of decorative, not edible) and jelly, the maximum amount of 0.25g/kg. |
production method
1, extracted from natural amaranth (Amaranthus mangstanuslL).
2. soak the whole black mulberry dried at 40 ℃ with 50% ethanol aqueous solution at room temperature (or pulverized to 0.175mm) for 2 days, and repeat the leaching for 3 times after filtration; After the filtrate is distilled to recover ethanol, concentrate under reduced pressure to obtain extract, or further dry to obtain powdered product.
0.1% ethanol hydrochloride solution can also be used as extractant, leaching at 75 ℃ for 2h, cooling, suction filtration, vacuum concentration and recovery of ethanol at 75 ℃ to obtain the finished product.
3. Wash and chop the fresh amaranth, extract it with water at a certain temperature, press and filter. The filtrate is concentrated to a certain concentration by a falling film evaporator, and then dried by a centrifugal spray dryer to obtain a 1.4%-containing powdered pigment product with a yield of 2.5%-3.0%.
4. Wash and chop the fresh Jiancai, extract it with water at a certain temperature, press the filter, concentrate the filtrate to a certain concentration by a falling film evaporator, and then dry it with a centrifugal spray dryer to obtain a 1.4%-containing powdered pigment product with a yield of 2.5%-3.5%.