1.02282

Quinaldine red

pH indicator, Reag. Ph Eur

• Synonym(s): Quinaldine red
• Empirical Formula (Hill Notation): C₂₁H₂₃IN₂
• CAS Number: 117-92-0
• Molecular Weight: 430.33
• MDL number: MFCD00011968
• UNSPSC Code: 12352107
• EC Index Number: 204-221-5
• NACRES: NA.21

Properties

• product name: Quinaldine red, indicator Reag. Ph Eur
• Agency: reag. Ph. Eur.
• Quality Level: 200
• form: solid
• impurities: ≤5% Water (Karl Fischer)
• visual transition interval: 1.4-3.2, colorless to red
• mp: 240 °C (decomposition)
• bulk density: 290 kg/m³
• λmax: 528-533 nm in acetic acid
• storage temp.: 2-30°C
• InChI: 1S/C21H23N2.HI/c1-4-23-20(16-12-18-7-5-6-8-21(18)23)15-11-17-9-13-19(14-10-17)22(2)3;/h5-16H,4H2,1-3H3;1H/q+1;/p-1
• InChI key: JOLANDVPGMEGLK-UHFFFAOYSA-M

Description

Application

• Quinaldine Red as a fluorescent probe for determining the melting temperature (T(m)) of proteins: a simple, rapid and high-throughput assay.: This study presents Quinaldine Red as an effective fluorescent probe for determining the melting temperatures of proteins, offering a rapid and high-throughput method suitable for broad applications in biochemical research (Das et al., 2024).


• Red emitting fluorogenic dye as an efficient turn-on probe for milk allergen.: Explores the use of a red-emitting fluorogenic dye, likely involving Quinaldine Red, as a turn-on probe for detecting milk allergens, highlighting its potential in food safety and allergen detection (Chakraborty, 2022).


• A rapid, naked-eye detection of hypochlorite and bisulfite using a robust and highly-photostable indicator dye Quinaldine Red in aqueous medium.: Describes the application of Quinaldine Red for the visual detection of chemicals like hypochlorite and bisulfite, underlining its utility in environmental monitoring and chemical safety (Dutta et al., 2018).


• Self-Assembly and Formation of Chromonic Liquid Crystals from the Dyes Quinaldine Red Acetate and Pyronin Y.: Investigates the self-assembly properties of Quinaldine Red and its application in forming chromonic liquid crystals, demonstrating its potential in material science and nanotechnology (Magana et al., 2016).

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Transition range: pH 1.4 - pH 3.2 colourless - red
Absorption maximum λ_max. (Acetic acid): 528 - 533 nm
Spec. Absorptivity A 1%/1cm (λ_max; 0.005 g/l; acetic acid glacial; calculated on anhydrous substance): 1150 - 1480
Water (according to Karl Fischer): ≤ 5 %

Safety Information

• Storage Class Code: 11 - Combustible Solids
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable