Cresol Red CAS 1733-12-6 O-Cresolsulfonphthalein O-Cresol Red

• Customization: Available
• CAS No.: 1733-12-6
• Formula: C21h18o5s
• Model NO.: SUREST-77
• EINECS: 217-064-2
• Classification: Organic Analytical Reagents
• Grade: AR
• Specific Usage: For Synthesis
• Content: Standard
• Usage: Laboratory Reagents, Analytical Reagents, Diagnostic Reagents, Teaching Reagents
• Source: Dry Powder
• Habit Appellation: Special Reagent
• Application: Industry, Scientific Research, Health, Environmental Protection, Agriculture
• Property: Organic Reagent
• Shelf Life: 2 Years
• Stock: Available
• Molecular Weight: 382.43
• Color: Reddish Brown
• Melting Point: 290 ºC
• Water Solubility: Soluble
• Transport Package: 25kg /Drum
• Specification: 98%min
• Trademark: Surest
• Origin: China
• HS Code: 2934991000
• Production Capacity: 1000 Tons Yearly

Product Description

Product Description

 

Name	Cresol Red
Synonyms	o-Cresolsulfonphthalein; 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis(2-methylphenol) S,S-dioxide
Molecular Structure
Molecular Formula	C21H18O5S
Molecular Weight	382.43
CAS Registry Number	1733-12-6
EINECS	217-064-2

Properties

Melting point	290 ºC
Water solubility	soluble

 
 

Chemical Property/Description:

 

Cresol Red is an organic acid-base indicator with the appearance of a reddish brown crystalline powder. It is sensitive to PH and is yellow at PH 4.4-6.2, red at PH 6.2-8.3, and purple at PH greater than 8.3. it is not soluble in water, soluble in ethanol.



 

Main Uses:

 

1. Biochemical experiments:Cresol Red can be used for acid-base titration, electrophoresis staining and other experiments, and is often used as an indicator in yeast plasmid screening.

2. Textile field: Cresol Red can be used as a red dye on textiles.

3. Food field: Cresol Red can be added to food as a dyeing agent, such as strawberry flavored yogurt, juice drinks, etc. It should be noted that although Cresol Red is widely used in experimental and industrial production, it has been suspected of carcinogenicity and effects on the human nervous system in the past.

However, in practical applications, it is necessary to pay attention to its safety and use, so as not to cause harm to the human body and the environment.

 

Specification

Tests	Specification
Appearance	Reddish-brown powder
PH ranges	pH 6.5 (yellow) to pH 8.5 (purple)
Quality absorption coefficient α1(λ1,pH 6.5)/(L/cm·g)	49.0~67.0
Quality absorption coefficient α2(λ2,pH 8.5)/(L/cm·g)	100.0~132.0
Greatest absorption wavelength λ1(pH=6.5)/(nm)	432~436
Greatest absorption wavelength  λ2(pH=8.5)/nm	571~574
Solubility in ethanol	Pass
Residue on ignition(as SO4),%	≤0.2%
Loss on drying,%	≤3.0%

Detailed Photos

 

FAQ

 

FAQ
Question 1: Can I get samples?
Answer: Yes,you can get free samples of our most products,
while the courier cost will be borne by the buyers.

Question 2: What's your MOQ?
Answer: For a express delivery order,the MOQ is usually 100 g~1 kg;
for an air transport order or sea delivery order ,the MOQ is usually 25 kgs.

Question 3: What's your delivery time?
Answer:
Orders shipped by express delivery,the delivery time is usually 5~7 working days;
Orders shipped by air transport,usually around 7~10 working days;
Orders shipped by sea , usually around 2~3 working weeks.

Question 4: What are the different payment methods?
Answer: We usually accept T/T, L/C and Western Union.

Question 5: How do you treat quality complaint?
We take quality very seriously, it is one of the founding principles of our business.
 If the quality problem actually exists, we will replace with qualified goods or refund the money.