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Postion:Product Catalog >Chemical Reagents>Organic reagents>The polycyclic compound>Alizarin
Alizarin
  • Alizarin
  • Alizarin
  • Alizarin
  • Alizarin
  • Alizarin

Alizarin NEW

Price Get Latest Price
Package 1kg 25kg
Min. Order: 1kg
Supply Ability: 100kg
Update Time: 2026-06-27

Product Details

Product Name: Alizarin CAS No.: 72-48-0
EC-No.: 200-782-5 Min. Order: 1kg
Purity: 99.5% Supply Ability: 100kg
Release date: 2026/06/27

Alizarin (1,2-dihydroxyanthraquinone) is a naturally occurring red anthraquinone dye derived historically from the roots of the madder plant (Rubia tinctorum), now produced synthetically. Here's a detailed chemical breakdown:

Chemical Formula: C??H?O?

IUPAC Name: 1,2-Dihydroxy-9,10-anthraquinone

Structure: It consists of a planar, conjugated anthraquinone core (three fused 6-membered rings) with hydroxyl (-OH) groups attached to positions 1 and 2 (adjacent/ortho positions) on the central ring.

    • Simplified: O=C?C?=C(C=CC?=C?C(=O)C?=C(C=CC=C?)C?=O)O

      Key Properties:

    • Appears as orange-red crystals or powder.

    • Insoluble in cold water, sparingly soluble in boiling water, soluble in alkalis, ethanol, ether, and organic solvents.

    • Its intense red color arises from its extended conjugated π-electron system.

      Function as a Dye (Mordant Dye):

    • Alizarin itself is not a direct dye. It forms insoluble, colored complexes (lakes) when chelated with metal ions (mordants) like Al3? (alum), Ca2?, or Sn2?.

    • The ortho-dihydroxy groups on the anthraquinone core are essential for chelating metal ions. The specific metal determines the final shade (e.g., Al3? gives bright red "Turkey red", Sn2? gives pink, Fe3? gives violet/brown).

      Historical & Modern Significance:

    • One of the oldest known natural dyes, used for millennia.

    • The first natural dye to be synthetically produced industrially (Carl Graebe & Carl Liebermann, 1869), revolutionizing the dye industry and leading to the decline of madder cultivation.

      Modern Uses:

    • Histological stain: Used to stain calcium deposits in tissues (e.g., Alizarin Red S, the sulfonated derivative).

    • Indicator: Acts as a pH indicator (yellow below pH 5.5, red above pH 6.8, violet above pH 12).

    • Pigment: In artists' pigments (e.g., Alizarin Crimson).

    • Teaching: A classic example of mordant dye chemistry.

      CAS Number: 72-48-0

      Toxicity: Low acute toxicity, but can be a skin/eye irritant. Suspected of causing genetic defects (EU H351).

In short: Alizarin (C??H?O?) is a pivotal ortho-dihydroxy anthraquinone compound, famed as a natural red mordant dye requiring metal ions (like Al3?) to form its characteristic insoluble red lakes on fabrics. Its synthesis in 1869 marked a milestone in industrial chemistry. Today, its derivatives are primarily used as biological stains and pH indicators.

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Company Profile Introduction

Wuhan Fortuna Chemical Co.,Ltd established in 2006, is a big integrative chemical enterprise being engaged in Pharmaceutical & its intermediates, Food/Feed additives, Fine chemicals in distributing the products of our own company and affiliated enterprises, are the members of Hubei E-commerce Chamber. Our company has professional persons who major in chemical R&D and sicentific management, supply fine chemical products with high quality and close service, also supply custom-tailored products according to our clients' requirement. We have a positive and self-motivated management work team with a common philosophy, caring and commitment through teamwork, our team strive to achieve success in delighting our clients and ourselves. Since Wuhan Fortuna Chemical Co., Ltd founded, we continuously innovate our products and improve our service, sales network. Hence, we initiate the first sale mode on net in China, which is the retail trade of small package bring along wholesale of diversified management modes. Our products are exported widely to South Korea, Vietnam, Australia, Europe and South America, highly recommended by our clients.We insist on the management creed “Market is our compass, Quality is our life, Credit is our soul”. Clients’ trust is our forward powder, their satisfaction is our struggling goal.

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