98% Bulk Cresol Red Of ISO Factory
Cresol red is a greenish powder, ranging from green to dark green or brown-red, slightly soluble in water and very soluble in ethanol but insoluble in acetone or benzene.
Its color changes from orange to yellow between pH 0.2 and 1.8 and from yellow to purple between pH 7.0 and 8.8.
In labs and environmental protection industries, it is used as an acid-base indicator, a dye, and a two-color indicator.
Generally, people dilute it to a 0.1% elution or to a 0.04% sodium salt aqueous solution as an indicator.
For example, it is used as a pH-sensitive indicator dye in nano-optical urea biosensor membranes and in heteronuclear-structured fiber-optic pH sensors.
If you are looking for cresol red manufacturers in China, please contact us for a free quote now.
Why Choose Us As Your Cresol Red Supplier In China?
1. Steady Stock For Prompt Shipment
As China’s largest manufacturer of cresol red, we maintain a rotating stock of over 1,000 kg, ready to fulfill urgent orders from our regular and new customers.
Once the stock quantity falls below 500 kg, we will create a production schedule to ensure a stable supply.
2: High Purity Equals High Quality
We adhere to the ISO 9001 guidelines in our production, and our purity is at least 98%.
Due to our strict adherence to our production procedures, our purity consistently exceeds 98% as a fine powder. Ask us for a sample to verify.
Applications and Specifications
Technical Documents Download
Analytical Chemistry & pH Indicator (Largest Segment)
Cresol Red is one of the most widely used pH indicators in analytical chemistry:
Routine pH assessments — in microbial culture media preparations
Titrations — acid-base titrations requiring precise endpoint detection
Colorimetric pH sensors — monitoring dissolved CO₂ in natural waters
Quality control — in pharmaceutical and food manufacturing
Buffer preparation — verifying the pH of buffer solutions
Molecular Biology & Electrophoresis (High-Growth Segment)
Cresol Red has become an essential tool in molecular biology laboratories:
Electrophoresis tracking dye — in DNA, RNA (agarose), and protein (polyacrylamide) electrophoresis
Apparent molecular size — in agarose, Cresol Red runs with an apparent molecular size of approximately 125 bp DNA
PCR reagent systems — suitable constituents of PCR reagent systems
Taq polymerase compatibility — Cresol Red does not inhibit Taq polymerase
Urease detection — commonly used with lead acetate for the detection of urease after PAGE
Diagnostic & Clinical Applications
Cresol Red is widely used in diagnostic assay manufacturing:
Hematology — diagnostic assays and hematological testing
Histology — tissue staining and histological analysis
Medical diagnostics — pH-based diagnostic tests
Research use only (RUO) — in vitro diagnostic research
Food & Beverage Analysis
Cresol Red is used in food and beverage quality control:
pH testing — in food and beverage manufacturing
Quality assurance — monitoring acidity and alkalinity
Beverage analysis — carbonated beverage pH monitoring
Environmental & Water Quality Monitoring
Cresol Red plays a role in environmental analysis:
Water quality monitoring — pH assessment in natural waters
Colorimetric sensors — monitoring dissolved CO₂ in natural water sources
Environmental research — water quality and pollution studies
Product Name: Bulk Cresol Red
Cas Number: 1733-12-6
Other Names: O-Cresol red, O-Cresolsulfonphthalein, Cresolsulfophthalein, o-Cresolsulfonephthalein.
Chemical Formula: C21H18O5S
Molecular Weight: 382.4 g/mol
Chemical Name: 4-[3-(4-hydroxy-3-methylphenyl)-1,1-dioxo-2,1λ6-benzoxathiol-3-yl]-2-methylphenol.
HS Code: 2934991000 (Sulfolactone and sulfolactam-磺内酯及磺内酰胺)
Shipping Options: Suitable for air, sea, and rail shipping.
Purity or Assay: 98% as Min
Standards: Enterprise Standards
Certificates available: ISO
Documents Available: COA
Supply Capability: 50 Tons per year
MOQ: 1 KG
Lead Time: 3~5 days for quantities under 200 KG; 7~8 days for orders under 400 KG.
Stock Status: Over 400KG
Shipping Temperature: Room temperature
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