Azo Rubine CAS 3567-69-9
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- Appearance: Red brown powder
- Assay: 99. 0%min
- Stock: In stock
- Sample: Available
- Zhishang Chemical: Azo Rubine Supplement
Azo Rubine: The Complete Guide
Index of Azo Rubine Contents
Azo Rubine for Sale
Basic Info of Azo Rubine
C.I. 14720; :Azorubin pure; ChroMotrope FB; Acid Red 14; Azorubine
Food additives; Pharmaceutical raw materials; Dye Intermediates
What is Azo Rubine?
Nitrogen red or azorubine is an azo dye, which is produced as disodium salt through chemical synthesis. In its dry state, it is red to maroon. It is mainly used in food for heat treatment after fermentation. E code is E122.
In the United States, this color was listed as FD & C Red No. 10 in 1939 for topical drugs and cosmetics. It was delisted in 1963 because no one was interested in the research needed to support the establishment of security. It is not used in American food.
In the EU, azorubine, known as E-number E122, is authorized for use in certain foods and beverages, such as cheese, dried fruits and some alcoholic beverages, and is allowed to be used as an excipient of drugs.
There is no provision on azo red base in the food code.
Azo Rubine Uses
- Edible red coloring.
- Azo rubine and acid lake blue A make up acid medium dark blue AGLO. Its heavy metal salts can be used as organic pigments.
- Azo rubine is mainly used for the dyeing of wool, silk and nylon and the direct printing of fabrics. It is mostly used for wool fabrics. It is typically dyed with acid eco-friendly B or acid lake blue A. It can be dyed with chrome to get navy blue color. If a small amount of acid violet 4BNS is added to adjust the color, the color will be more vivid, which is the main use of azo rubine. Due to its susceptibility to metals, it is not suitable for dyeing red.
- Azo rubine is additionally utilized for the coloring of natural leather, paper, anodized aluminum, ink, timber items, biological items, cosmetics, and so on, in addition to the coloring of medication as well as food, and also can likewise be made into lake pigments.
- Azo rubine is a kind of red dye used for food after fermentation.
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Production Method of Azo Rubine
Using 1,4-aminonaphthalenesulfonic acid and NW acid as raw materials, 1,4-aminonaphthalenesulfonic acid was diazotized and coupled with NW acid to obtain the product. The finished product is obtained by salting out, filtering and drying.
Add 1000L of water and 200kg of 1,4-aminonaphthalenesulfonic acid to the diazonium pot, stir to dissolve. Then add 492kg of hydrochloric acid (15%), cool down to 0°C, add 30% sodium nitrite solution (containing 57.6kg of NaNO2), control the temperature below 25°C, and keep it for 1.5h to obtain a diazo liquid.
Add 1250L of water, 192kg of soda ash and 89kg of NW acid to the coupling pot, stir to dissolve, cool to 15°C, slowly add the above diazonium solution within 2h, and stir until the diazonium salt disappears. Continue to stir for 3h, heat up to 65-70°C, add salt for salting out, filter, dry and pulverize to obtain the finished product.
- Carmoisine – PubChem
- WHO, 1983. Evaluation of certain food additives and contaminants. Linked from WHO listing here
- Klaus Hunger; Peter Mischke; Wolfgang Rieper; et al. (2005). “Azo Dyes”. Ullmann’s Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH.