Quinaldine Red Indicator

Product Description

Quinaldine Red (QR), also known as 2-(p-Dimethylaminostyryl)quinoline methyl sulfate, is a synthetic dye widely used as an acid-base indicator and spectrophotometric reagent. It is a deep red crystalline compound known for forming colored complexes with various metal ions and is frequently applied in analytical chemistry, biochemical assays, and spectrophotometric determinations.

The indicator is particularly valued for its sharp color transition, high sensitivity, and stability in aqueous and organic media, making it suitable for quantitative analysis of metals such as vanadium, cobalt, and molybdenum.

Key Features

• Chemical Name: 2-(p-Dimethylaminostyryl)quinoline methyl sulfate
• Common Name: Quinaldine Red
• Chemical Formula: C₁₇H₁₉NO₄S
• Molecular Weight: 333.40 g/mol
• CAS Number: 458-88-8
• Appearance: Dark red to purple crystalline powder
• Odor: Odorless
• Purity: ≥98% (Analytical / Indicator Grade)
• Melting Point: ~250 °C (decomposes)
• Solubility: Soluble in water, ethanol, and acetone; slightly soluble in ether
• pH Transition Range: 1.8 – 3.0 (Red to colorless)
• Stability: Stable under dry and cool storage conditions

Applications

Analytical Chemistry

• Used as a colorimetric and spectrophotometric reagent for transition metal determination (e.g., Fe³⁺, Co²⁺, V⁵⁺, Mo⁶⁺).
• Serves as an acid-base indicator in strong acid titrations.
• Applied in complexometric titrations and metal-ligand interaction studies.

Biochemical & Environmental Analysis

• Used in enzyme and oxidation-reduction studies as a redox-sensitive dye.
• Aids in quantifying trace metals in water and environmental samples.

Educational Applications

• Demonstrates color change reactions, metal complexation, and acid-base equilibria in teaching laboratories.

Safety & Handling

• Hazard: May cause irritation to eyes, skin, and respiratory tract. Harmful if swallowed.
• Precautions: Use gloves, protective goggles, and lab coat. Avoid inhaling dust.
• Storage: Store in a cool, dry, and dark place, tightly sealed. Keep away from strong oxidizing agents.
• Emergency Measures: In case of contact, rinse affected area with plenty of water and seek medical attention if irritation persists.

Why Choose Quinaldine Red Indicator?

• High-purity indicator and spectrophotometric reagent.
• Excellent sensitivity and stable color transitions.
• Suitable for quantitative metal analysis and research applications.
• Reliable performance and long shelf life.

Price in Bangladesh

Available in analytical and indicator-grade packaging (1 g, 5 g, 10 g, 25 g).
Competitive pricing for research laboratories, universities, and industrial QC labs.

Where to Buy

Quinaldine Red Indicator is available from authorized laboratory reagent suppliers and distributors across Bangladesh.

Why Buy from M/S Bright Scientific Co.?

• Trusted Supplier: Serving universities, research institutions, and testing laboratories.
• Assured Quality: Verified for analytical and spectrophotometric applications.
• Affordable Pricing: Competitive rates for small and bulk quantities.
• Prompt Delivery: Reliable nationwide distribution and safe packaging.

Contact Information
M/S Bright Scientific Co.
📞 Phone: 01711285976