For professionals in chemistry and biology, a deep understanding of chemical properties is fundamental to successful application and research. Orange I (CAS 523-44-4), also known as Alpha-Naphthol Orange, is a compound that exhibits interesting chemical characteristics, making it valuable as both a pH indicator and a protein stain. As a leading chemical supplier, we provide insights into the chemistry of this important reagent.

Chemical Structure and Formula
Orange I possesses the molecular formula C16H11N2NaO4S and a molecular weight of approximately 350.32 g/mol. Its structure features an azo linkage connecting a naphthol group to a benzene sulfonate group. This chemical architecture is key to its chromophoric properties and its reactivity.

Key Chemical Properties and Reactions
When you choose to buy Orange I, you are acquiring a compound with distinct chemical behaviors:

• Appearance: It is supplied as a reddish-brown powder.
• Solubility: Orange I is soluble in water, forming an orange-red solution. It also shows solubility in ethanol, yielding an orange solution. This solubility profile is crucial for its preparation in aqueous and alcoholic media for various assays.
• pH Sensitivity: The compound’s most notable chemical property is its pH-dependent color change. In acidic conditions, it can precipitate from aqueous solutions. In alkaline conditions, its color deepens to a more intense red. Specifically, it acts as an acid-base indicator, showing a transition from orange-yellow to deep pink within the pH range of 7.6 to 8.9. This property is utilized in acid-base titrations.
• Interaction with Proteins: Its ability to bind with proteins, facilitating their staining, indicates specific interactions with protein functional groups, likely through electrostatic or hydrophobic interactions, though the precise mechanism can be complex and dependent on surrounding conditions.

Sourcing High-Quality Orange I
To effectively utilize these chemical properties, sourcing high-purity Orange I is essential. As a dedicated chemical manufacturer, we ensure our product meets stringent quality standards, typically with a minimum purity of 90%. This high purity guarantees predictable behavior and reliable results, whether for precise pH measurements or consistent protein staining. When you need to purchase this chemical, partnering with a trusted supplier like us ensures you receive a product that performs as expected, at a competitive price.

Understanding the chemical properties of Orange I allows for its optimal application in research and analysis. Contact us to learn more about sourcing this versatile compound from a reliable manufacturer.