Zhishang Chemical

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Zhishang Chemical

Tartrazine CAS 1934-21-0

Molecular Formula: C16H13N4NaO9S2

Formula Weight: 492.41

ZSpharmac: Tartrazine Supplement

Product Name: Tartrazine
CAS No: 1934-21-0
Purity: 99%

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Basic Info

Product Name:Tartrazine
Other Names:Food Yellow No. 4
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Cosmetic Raw Materials
Appearance:Orange Powder
EINECS No.:217-699-5
Storage:Room Temp
Provide:Tartrazine MSDS;
Tartrazine COA

What is Tartrazine?

As a common colorant, Tartrazine has a very good dyeing effect. After using tartrazine, it can make the color of fingers look more bright, which can increase people’s desire to buy. In daily life, we often see food Some add lemon yellow, such as in some juice-flavored beverages, and in some candies or cakes, as well as canned green plums, shrimp chips or some puffed foods.

Tartrazine appears in many food and beverages, medicines and cosmetics, and also appears in the dyeing of some wool or silk. Tartrazine is an acidic dye that is yellow powder. Now that we know what tartrazine is, tartrazine can use a food safety detector to see what colorants are in food. Many people are worried about whether the use of tartrazine will bring certain harm to the body, but it should be noted that an appropriate amount of tartrazine will not cause harm to the body, and excessive consumption may bring certain harm to the human body. harm.

Tartrazine Property

Melting point 300 °C
storage temp. room temp
solubility DMSO (Sparingly, Heated), Water (Slightly)
form Powder
Colour Index 19140
color Orange
Water Solubility 260 g/L (30 ºC)


Tartrazine Uses

  1. As a food coloring representative, Tartrazine can be utilized in fruit juice (flavorful) drinks, carbonated beverages, prepared wine, environment-friendly plums, shrimp (flavorful) slices, dipped side dishes, red and environment-friendly silk sweets, bread designs and canned watermelon sauce, the biggest The usage amount is 0.1 g/kg; the optimum use quantity in veggie healthy protein beverages and lactic acid germs drinks is 0.05 g/kg; the optimum usage amount in ice cream is 0.02 g/kg.
  2. Tartrazine is made use of as a colorant in food, beverages, pharmaceuticals, feed and also cosmetics.

Production Method of Tartrazine

Preparation of sodium dihydroxytartrate. At about 20°C, tartaric acid was slowly added to the mixture of nitric acid, sulfuric acid and fuming sulfuric acid, and stirred. After the addition, the reaction was kept constant for 0.5 h, and then water was added and the constant constant stirring was continued for 48 h. After the reaction is completed, sodium carbonate is added for neutralization (the temperature does not exceed 20°C), filtered, washed with water and dried to obtain sodium dihydroxy tartrate.
(2) Preparation of phenylhydrazine to sulfonic acid. Dissolve sodium carbonate in 13 times the amount (mass) of hot water, then add p-aminobenzenesulfonic acid, and stir, after cooling, slowly add concentrated sulfuric acid, and cool to below 5°C. Slowly add 1:2 (mass ratio) sodium nitrite solution at 3-5 °C for diazotization. After the reaction, the material was strongly acidic (blue) to Congo red test paper, centrifuged, and the diazonium salt was rinsed with clean water. Note: The diazo compound cannot be dried or placed in a high temperature, otherwise it will explode.
Add 1.5 times the amount (mass) of the crystalline sodium sulfite solution to water at 0-5°C and under vigorous stirring, slowly add the diazonium salt, when the material is bright orange and the phenolphthalein test solution is weakly alkaline, continue stirring. Incubate the reaction for 1h. Then heat the feed liquid to boiling, slowly add hydrochloric acid (about 0.5h), the feed liquid gradually turns yellowish, continue stirring, and slowly add zinc powder until the feed liquid is colorless, and white flake crystals are precipitated. Cool overnight, separate and dry to obtain phenylhydrazine-p-sulfonic acid.
(3) Production of Tartrazine. Add bishydroxytartaric acid to 1.5 times the amount (mass) of water, slowly add hydrochloric acid, and heat to 30°C; then add phenylhydrazine-p-sulfonic acid to 3 times the amount (mass) of water, and add sodium hydroxide solution to stir; It was then added to the dihydroxytartaric acid solution and reacted at 80 °C for 1 h. Cooled to room temperature, left standing for 12h, a yellow precipitate was precipitated, and the crude product was obtained by filtration. The crude product can be dissolved in water at 60°C, an appropriate amount of sodium carbonate can be added to make it weakly alkaline, then refined salt can be added, and the finished product can be obtained by cooling, crystallization, separation and drying.
It can also be obtained by coupling with 1-p-sulfophenyl-3-carboxy-5-pyrazolone after diazotization of p-aminobenzenesulfonic acid.
(4) Preparation of Tartrazine aluminum lake. Aluminum hydroxide is prepared from aluminum salts such as aluminum chloride, aluminum sulfate and other alkalis such as sodium carbonate, and Tartrazine aqueous solution is added to precipitate the product.

Tartrazine Content Analysis Method

A method for accurately analyzing the content of Tartrazine, which is specifically carried out according to the following steps:

(1) Weigh m grams (about 2 grams) of Tartrazine sample (accurate to 0.0002 grams) in a 250m1 conical flask, add 50ml of concentrated nitric acid with a mass fraction of 65%, shake well, cook on an electric stove, and keep a slight Boiling state for 2 hours, m≤2;

(2) Remove the conical flask and cool to room temperature, add 55ml of mixed strong acid solution with a mass fraction of 65% concentrated nitric acid and a mass fraction of 71% perchloric acid with a volume ratio of 10:1, shake well, cook on an electric stove, and keep a slight Boil for 1 hour until the solution in the conical flask is light green; if not, add 22ml of mixed strong acid solution with a mass fraction of 65% concentrated nitric acid and a mass fraction of 71% perchloric acid with a volume ratio of 10:1, Continue to heat slightly until the solution digests and turns light green;

(3) Remove the conical flask and cool to room temperature, add 100ml of distilled water, and boil on an electric stove to remove excess acid in the solution, until the solution remains 30ml;

(4) Remove the conical flask, rinse the bottle mouth and bottle wall with a small amount of distilled water, add 60ml of barium chloride solution with a concentration of 60g/L, shake well, put it on an electric stove to boil, remove it, and cool it to room temperature. A white barium sulfate precipitate will appear at the bottom of the conical flask. Finally, use a 30ml glass sand core crucible with a known weight of m0 that is washed and dried before suction filtration, and wash the precipitate with distilled water for 10 times until the filtrate is checked with silver nitrate and no white precipitate is found. And PH is 6-7, otherwise continue to rinse with distilled water;

(5) place the glass sand core crucible of cleaning and precipitation in 100-105 ℃ oven and bake for 2 hours, take out and place in desiccator and cool to room temperature, then weigh the total weight m of crucible and precipitation;

(6) Weigh m grams (about 2 grams) of Tartrazine sample (accurate to 0.0002 grams) in a 300ml beaker, add 150ml of distilled water, stir with a glass rod to completely dissolve tartrazine, add 20 grams of activated carbon, and add nitric acid 1ml of nitric acid solution with a volume ratio of 1:1 to water, stir evenly, let stand for 30 minutes, filter with dry filter paper, if the filtrate is colored, add 5 grams of activated carbon and place under stirring for 1 hour, then filter with dry filter paper, such as If there is still color, replace the activated carbon and re-operate;

(7) Collect all the colorless filtrate in step (6), add 30ml of barium chloride solution with a concentration of 60g/L, shake well, put it on the electric stove to boil, take it off, and cool it to room temperature. At this time, the bottom of the conical flask will A white barium sulfate precipitation appeared, and finally filtered with a 30ml glass sand core crucible with a known weight of m2, washed and dried in advance, and washed the precipitation with distilled water for many times until the filtrate was checked with silver nitrate and had no white precipitation and the pH was 6- 7, otherwise continue to rinse with distilled water;

(8) Put the glass sand core crucible with the cleaned precipitation in step (7) and bake it in a 100-105 ℃ oven for 2 hours, take it out and place it in a desiccator and cool it to room temperature, then weigh the total weight of the crucible and the precipitation m3;

(9) Calculation: Main content of tartrazine %={(m1‑m0)‑(m3‑m2)}×100/(0.8736×m)%

Among them: 0.8736 is the mass of barium sulfate formed by the sulfonic acid groups contained in 1 gram of 100% Tartrazine.

Company Profile and Corporate Culture

Company Profile:

ZhiShang Chemical is owned by ZhiShang Group is a professional new-type chemicals enterprise combined into research and development, production and sales .

The company’s competitive product is pharmaceutical raw materials and intermediates (especially carbohydrate derivatives Series), In recent years, the company has made a major breakthrough in food and feed additives, plant extraction, industrial chemicals industry .

The company insists on the spirit of “sincere management, strict quality control, customer as god” , get consistent high praise from customers at home and abroad.

Corporate Culture:

Help China Chemicals to benefit the happiness of human life
Become the most trusted chemical supplier in the world
Striver – oriented, enrich employees, customer first, deep service, seek development
Be prepared for danger in times of peace, forge ahead actively, unity and cooperation, and be brave to fight

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Additive , Chemical Auxiliary & Catalyst , Organic Chemicals
  • Products/Service: Organic Intermediate,Inorganic Chemistry, APIs, Dyestuffs And Pigments, Fragrance And Spices, Food Additives
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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