1.03026

Bromothymol blue

pH indicator, ACS, Reag. Ph Eur

• Synonym(s): Bromothymol blue, 3′,3′′-Dibromothymolsulfonphthalein, BTB
• Empirical Formula (Hill Notation): C₂₇H₂₈Br₂O₅S
• CAS Number: 76-59-5
• Molecular Weight: 624.38
• MDL number: MFCD00005872
• UNSPSC Code: 12171502
• EC Index Number: 200-971-2
• NACRES: NB.21

Properties

• product name: Bromothymol blue, indicator ACS,Reag. Ph Eur
• grade: ACS reagent
• Quality Level: 200
• agency: reag. Ph. Eur.
• form: solid
• loss: ≤3% loss on drying, 110°C
• visual transition interval: 5.8-7.6, yellow to blue
• bulk density: 450 kg/m³
• storage temp.: 2-30°C
• InChI: 1S/C27H28Br2O5S/c1-13(2)17-11-20(15(5)23(28)25(17)30)27(19-9-7-8-10-22(19)35(32,33)34-27)21-12-18(14(3)4)26(31)24(29)16(21)6/h7-14,30-31H,1-6H3
• InChI key: NUHCTOLBWMJMLX-UHFFFAOYSA-N

Description

Application

• Novel pH-responsive indicator films based on bromothymol blue-anchored chitin for shrimp freshness monitoring: This study presents innovative pH-sensitive films that incorporate bromothymol blue into chitin, designed for tracking shrimp spoilage. The development and testing of these films in real-time scenarios offer a viable method for monitoring seafood freshness, ensuring quality control in food distribution chains (Yang et al., 2023).

Analysis Note

Transition range: pH 5.8 - pH 7.6yellow - blue
Appearance of solution: passes test
Loss on drying (110 °C): ≤ 3
Transition range (according to ACS): passes test
Sensitivity test: passes test

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable