| Molecular Formula | C18H16O9 |
| Molar Mass | 376.31 |
| Physical and Chemical Properties | Chemical properties dark red powder, paste or liquid, slightly special smell. This water-soluble pigment is bright red when acidic, and red to purple when neutral to alkaline. Poor heat resistance and light resistance. It is the most unstable to blue light and resistant to red light, so it is appropriate to use red glass packaging. The extract is strongly acidic. Metal ion resistance (such as Fe3) is poor, and metal chelating agents or chlorides such as phytic acid can be added to improve its heat resistance and light resistance. Arbitrarily miscible in water, ethanol, propylene glycol and other alcoholic organic solvents. Insoluble in lipophilic organic solvents such as animal and vegetable oil, chloroform, benzene, etc. |
| Use | Uses edible red (to purple) pigment. It is suitable for foods with pH value below 4 and no need of high temperature heating, such as syrup, cold spots, powder drinks, fruit Dew, ice cream, jelly, etc. Dosage 0.1% ~ 0.5%. Japanese for drinks and sweets. |
| Raw Materials | L(+)-Ascorbic acid Pectin Arachidoside |
use
1. as a food colorant, our country stipulates that it can be used in hard candy and agar soft candy with the dosage of 3~6 g/kg and 1.6~2.4 g/kg respectively. Generally, in foods such as jelly, jam, fruit juice and fruit wine, the dosage is generally 0.1~0.5 g/kg; In the preparation of wine, juice (flavor) drinks and candies, appropriate amount is used according to production requirements.
2. as a food colorant, our country stipulates that it can be used in hard candy and agar soft candy in dosage of 3-6g/kg and 1.6-2.4 g/kg respectively. In jelly, jam, fruit juice, fruit wine and other foods, the dosage is generally 0.1-0.5 g/kg; In the preparation of wine, fruit juice (flavor) beverage and candy according to the production needs of appropriate use.
production method
1. remove spoiled leaves from roselle calyx, wash and dry, heat to boil with 20 times of water, keep warm and stir for 0.5h, and filter while hot. The filter residue is extracted 3 times with 10 times of water according to the previous method. The third and fourth filtrates can be used as the extraction solvent for the next batch of roselle calyx. The first and second filtrates are combined and concentrated under reduced pressure at 60-70 ℃ until the solid content is 30%-40% to obtain product 1, which is further concentrated to dry (or vacuum dried at 60 ℃) to obtain powdered product 2. The product 1 can also be stirred and dissolved with twice the amount of 95% ethanol. After standing for 6 hours, the upper layer is sucked, filtered, and the filter cake is washed 4 times with 50% ethanol. The filter residue is dried at 50-60 ℃ to obtain roselle pectin. The clear liquid, filtrate and washing liquid are combined, and ethanol is recovered by atmospheric distillation. Then the product 3 is concentrated under reduced pressure at 60-70 ℃ until the solid content.
2. remove spoiled leaves from roselle calyx, wash and dry, heat to boil with 20 times of water, keep warm and stir for 0.5h, and filter while hot. The filter residue is extracted 3 times with 10 times of water according to the above method. The third and fourth filtrates can be used as solvent for NT -- ~ roselle calyx, and the first and second filtrates are combined, concentrate under reduced pressure at 60~70 ℃ until the solid content is 30% ~ 40% to obtain product 1. Further concentrate to dry (or vacuum dry at 60°C) to obtain powdered product 2. You can also use 2 times the 95% amount of ethanol to stir and dissolve the product 1. After standing for 6 hours, suck the supernatant, filter, wash the filter cake with 50% ethanol for 4 times, dry the filter residue at 50~60 ℃ to obtain roselle pectin, combine the clear liquid, filtrate and washing liquid, distill and recover ethanol at normal pressure, and then concentrate under reduced pressure at 60~70 ℃ until the solid content is 60% to obtain.
3. The calyx of Roselle (Hibiscs sabaariffa), an annual herb of the genus Hibiscus of the Sunflower family, is impregnated with ethanol and filtered to separate the pigment extract from the calyx. The filtered calyx is crushed and then extracted with ethanol solution containing 1% hydrochloric acid, and the secondary extract is combined and concentrated under reduced pressure at 30°C. The concentrated solution can be used as a product or evaporated to dry into powder.
1.5g total anthocyanins can be obtained from 100g dry calyx. It can also be extracted with water. In order to improve light resistance, antioxidants (L-ascorbic acid) can be added, and UV-opaque packaging materials, nitrogen replacement packaging, etc.