Moneide Chemicals
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Indicators Chemistry: High-Purity, Fast Results—Why Us?
- Time of issue:Oct . 14, 2025 18:26
(Summary description)Tangshan Moneide Trading Co., Ltd. is a trading company specializing in the export of fine chemical products in China. Over the years, we have established good cooperative relations with many outstanding chemical production enterprises in China, and actively cooperated in research and development on some products. Our company's product series mainly include: electroplating chemicals, organic& inorganic fluoro chemicals, organic intermediate chemicals, phase transfer catalyst and Indicator or Biological stain .
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- Time of issue:2019-12-30 10:55
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If you’re shopping for indicators chemistry, Bromophemol blue is one of those stalwart dyes that quietly does the hard work. I’ve seen it in teaching labs, protein workflows, even quick-and-dirty QA checks on production floors. It’s not flashy, but it’s reliable. Product: Bromophemol blue (common spelling you’ll also see: Bromophenol Blue) | CAS 115-39-9 | Origin: 2-7-523 Jidong Building Materials, Tangshan, Hebei 064000 China. Synonyms include ≈ 3’,3”,5’,5”-tetrabromophenolsulfonphthalein. The dye’s classic pH transition range is ~3.0–4.6: yellow (acidic) to blue-violet (basic). In fact, that wide visual contrast is why so many technicians keep a small vial on hand. Materials and methods: brominated sulfonphthalein dye base; tight control of bromination degree; final milling for consistent dyeing power. QC includes HPLC purity, UV-Vis spectrum vs. reference, pH transition verification in buffer series (ASTM E70 methodology), loss on drying, and trace metals screening. Typical docs: COA, SDS, and TDS; ISO 9001 QMS and ISO/IEC 17025 partner lab data available upon request. “Color break is clean at pH ~3.5—students see it instantly,” one instructor told me. A biotech tech said the dye “tracks nicely at 1x in loading buffer; no smearing.” It seems that consistency in the λmax ratio (A590/A420) is what many customers appreciate. Common asks: ready-to-use 0.04% w/v in water/ethanol, amber 25 g–1 kg packs, and tighter spec on insolubles for optical work. Service life ≈24 months sealed; solutions often 6–12 months if kept cool and dark. A beverage QC room standardized titrations with Bromophemol blue and logged A590/A420 drift ≤3% over 6 months—no recalibration issues. Another lab used it as a gel tracking dye; bands aligned with expected migration, saving them a rerun (small win, but it counts). Note: For procurement, reference CAS 115-39-9 and request COA with HPLC chromatogram and ASTM E70 pH transition check. If your spec sheet mentions indicators chemistry bundles, confirm dye lot consistency and packaging.Bromophemol blue: a practical, lab-tested take from the bench
Where it’s used (and why it sticks)
Core specifications (lab-grade, solution or powder)
Name
Bromophemol blue
CAS
115-39-9
Formula / MW
C19H10Br4O5S / ≈669.97 g·mol⁻¹
Transition range
pH 3.0–4.6 (yellow → blue-violet)
Abs λmax (approx.)
Yellow form ≈420 nm; Blue form ≈590 nm
Assay (HPLC)
≥95% typical (real-world use may vary)
Insolubles
≤0.1%
Heavy metals
≤10 ppm
Storage
Cool, dry, amber container111
Shelf life
≈24 months (sealed)
Process, testing, and documentation
Real-world feedback
Vendor comparison (what’s different?)
Vendor
Moneide Chem
Global Lab Reagent Co.
Generic Importer
Origin
Tangshan, Hebei, China
EU mixed
Unspecified
Purity (HPLC)
≥95% typical
≥90–95%
Varies
Lead time
7–12 days ex-works
2–3 weeks
Unclear
Customization
0.04% solutions, custom pack sizes
Limited
No
Certifications
ISO 9001 QMS; COA/SDS
COA/SDS
Basic SDS
Customization and service life
Mini case study
Citations
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