Chemical synthesis of carmine, what is carmine?

Carmine is a natural pigment, the earliest carmine dye ** in a kind of cactus cochineal, from tens of thousands of these small insects to get one or two carmine dye. At present, the food is generally used in 1 aminonaphthalene 4 sulfonic acid after diazotization and 2 naphthol 6, 8 sodium disulfonate coupling, the molecular formula C20H11N2Na3O10S3

Acid amaranth red is food coloring red No. 2, molecular formula C20H11N2Na23O10S3, purple-red powder, soluble in glycerol and propylene glycol, insoluble in oil. The aqueous solution is rose-red, purple in case of sulfuric acid, and pink-red after dilution; It is bright red when it is concentrated nitric acid, brown when it is concentrated hydrochloric acid, and there is a black precipitate. The aqueous solution is magenta when it meets concentrated hydrochloric acid, and it is reddish-brown when it meets sodium hydroxide solution.

It is an azo acid dye, with poor bacterial resistance, light resistance, heat resistance, salt resistance, good acid resistance, stable to citric acid, tartaric acid, etc., and sensitive to oxidation and reduction. It is obtained by diazotization of 1-naphthylamine-4-sulfonic acid, coupled with sodium 2-naphthol-3,6-disulfonate (R salt) under alkaline conditions, and refined by salt salting.

MF: C20H11N2O10S3Na3

Chemical name: 1-(4-sulfonic acid-1-naphthalene azo)-2-hydroxy-6,8-naphthalene disulfonic acid trisodium salt.

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1 pinyin 2 fruit carmine.

3 Food coloring carmine.

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Carmine is the main cultivar in the suburbs of Guangzhou. Also known as Datang guava, etc., it can be divided into 4 strains of palace pink, all red, birth red, and large leaf red, and it is better to have palace pink and all red. The palace pink fruit is pear-shaped, medium and large, with an average weight of 82 grams, the flesh is smooth, the taste is sweet, half of the ripe peel turns pink, and ripens from mid-June to late July.

The whole red fruit is pear-shaped, medium and large, the average weight of a single fruit is 78 grams, the skin is medium thick, the whole fruit is dark red and shiny when ripe, the flesh is coarse, the flavor is medium, and the fruit ripens from mid-June to late July. Both palace pink and all-red should be developed.

Carmine guava, the masses of this bird tour and the ground call it fruit, the variety is bright red, the flesh is thick, crisp and tender, rich in nutrition, it is mainly fresh food, and it is a fruit variety that is popular with the masses.

Carmine guava has been cultivated in Shilou Town for more than 30 years, mainly in Tantang and Shengzhou villages. The variety is adaptable, coarse, easy to manage, fast growing, and can be harvested after two years of planting, and there is no phenomenon of large and small years. Due to the excellent quality of carmine guava, in addition to some local sales, and exported to Hong Kong, Macao and neighboring counties and cities in large quantities.

**It is 4-5 times that of other guavas, and the economic benefits are very significant, and it is the main way for the local people to increase their income and get rich.

Water-soluble synthetic pigments, bright yellow light red grinding, monochrome variety. It can be safely used for coloring food, beverages, pharmaceuticals, cosmetics, feed, tobacco, toys, food packaging materials, etc.

English name: Ponceau 4R

Product National Standard Number:

Dye index name: food red 7

Dye Index Number: 16255

EC food colouring number: E124

Japanese Food Coloring Number: Food Red No. 102.

American Chemical Abstracts Number: CAS 2611827

EINECS number: EC2200362

MF: C20H11N2O10S3Na3

Iron oxide red and carmine are both common pigments, but they have the following differences:

1.The chemical composition is different: iron oxide red is an iron oxide compound, while carmine is an organic dye.

2.The color is different: Iron oxide red tends to be orange or brownish-red in color, while carmine is red or pink.

3.Different applications: iron oxide red is often used in pigments, coatings, ceramics and other fields, while carmine is often used in cosmetics, printing and dyeing and other fields.

4.Different stability: iron oxide red has good lightfastness and heat resistance, while carmine is susceptible to discoloration or fading due to the influence of light, heat, oxidation and other factors.

It is an aqueous solution azo colorant. Carmine is the most widely used and largest monoazo synthetic pigment in China.

Carmine is red to dark red homogeneous granules or powders and is odorless. Good light resistance, acid resistance, strong heat resistance (105), poor reduction resistance; Poor bacterial resistance. Soluble in water, the aqueous solution is red; soluble in glycerol, slightly soluble in alcohol, insoluble in oil; The maximum absorption wavelength is 508nm 2nm.

Stable to citric acid and tartaric acid; When alkalinized, it turns brown. The coloring properties are similar to those of amaranth red.

Detection methods: 1. High grinding rubber local effect liquid blind chromatography.

The principle of using high-performance liquid chromatography to detect carmine is to extract it by polyamide adsorption method or liquid-liquid partitioning method, make an aqueous solution, inject it into a high-performance liquid chromatograph, separate it by reversed-phase chromatography, and quantify carmine according to the retention time qualitatively and compared with the area of such a qiaofeng.

2. Thin layer chromatography.

The principle of using thin layer chromatography to detect carmine is that the water-soluble acidic synthetic colorant is adsorbed by polyamide under acidic conditions, and desorbed under alkaline conditions, and then separated by paper chromatography or thin layer chromatography, and compared with the standard qualitatively and quantitatively.

As a food coloring, carmine can be used for the coloring of fruit juice drinks, prepared wine, carbonated drinks, candy, cakes, ice cream, yogurt and other foods, but cannot be used in dried meat, dried meat products, aquatic products and other foods, mainly to prevent some criminals from using pigments to cover up the appearance of bad raw meat such as spoiled meat and deceive consumers.

According to China's "Hygienic Standard for the Use of Food Additives" (GB2760-1996), the scope and maximum use of carmine are the same as that of amaranth, and can also be used for candy color coatings and soybean milk drinks, and the maximum use is; Red sausage casing, the maximum dosage is , and the residual amount is .

Carmine is a food coloring. Also known as edible red No. 102 (Japan), edible red No. 7, ponceau red 4R, big red, bright scarlet, is an aqueous solution azo colorant. The chemical name is 1-(4'- Sulfonic acid group-1'-Naphthalene azo)-2-naphthol-6,8-disulfonic acid trisodium salt, is an isomer of amaranth red.

Carmine (Ponceau 4R) is currently the most widely used and largest monoazo synthetic pigment in China. In recent years, it has been reported that carmine belongs to the same azo pigment as Sudan dyes, which are banned by EU standards.

Carmine is a synthetic pigment that has been banned in many countries, and cochineal is a natural pigment, ** in cochineal. Carmine and cochineal are not a pigment!

It is a pigment that is forbidden by the country.

To put it simply, it's all a pigment!

In simple terms, it is a pigment.

Carmine pigment synonym: cochineal pigment. Ingredients: The main ingredient is carmine.

Nature and Indicators.

yellow at pH; pH orange; pH red; The pH is purplish-red. The lightfastness in the orange and red to purplish red ranges is better, while the pH is about and the lightfastness is poor.

Good thermal stability. In case of iron ions, the hue becomes pale or colorless. Compound phosphate has a color-protective effect on pigments.

Extracted from cochineal. The dry body of cochineal is finely ground, soaked in hot water of 60 70, and stirred from time to time, after a day or so, most of the pigment can be extracted, and then the second extraction can reach almost 100 extraction rate.

The filtrate was combined twice and concentrated under reduced pressure to obtain the pigment.

It can be used as a coloring agent for beverages such as liquor, fruit pulp, cold drinks, confectionery, confectionery, meat, sausages, etc., and can also be used in cosmetics.

Rouge is made from the red and blue flower plant.

Rouge is a kind of makeup made of red and blue flowers, which is then mashed in a certain vessel, and appropriately added with some oil and animal bone marrow, which is a very popular facial makeup product in ancient times.

Historical development of rouge

In ancient times, the main raw material for making rouge was red and blue flower, also known as safflower, which was frequently recorded and used as a raw material for medicines, dyes and beauty cosmetics since the Han Dynasty in China.

The red and blue flowers originated in Egypt, about the Han Dynasty through Central Asia into China, this flower color is ruddy and delicious, so the Huns picked it to make pigments, and used as women's beauty products. The word "rouge" is also the transliteration and evolution of the Xiongnu name of the red and blue flower shirt (the Xiongnu people called women "Yanshi", and the mountain with red and blue flowers was called "Yanzhi Mountain").

After the Wei and Jin dynasties, red and blue flowers were widely planted. In the "Qi Min Yaoshu", a special article is devoted to the cultivation technology of red and blue flowers and the manufacturing process of rouge. It is said that the petals of this flower contain two pigments, red and yellow, and after the flowers bloom, they are plucked whole, and then placed in a stone bowl and repeatedly pestled to form a bright red pigment after removing the yellow juice.

There are two kinds of rouge for women's makeup: one is made of silk cotton dipped in red and blue flower juice, called "Jinyan Branch"; The other is to process into a small and thin vertical flower piece, named "Golden Flower Swallow Branch". Around the time of the Northern and Southern Dynasties, people or Qingshan added cow pith, pig pancreas and other substances to this red pigment, making it a dense and lubricating grease ointment, and thus, the swallow branch was written as "rouge", and the word "fat" had a real meaning.

The above content reference: Rouge - Encyclopedia.