C.I. Acid Red 2
Methyl red chloride
CAS: 493-52-7
Molecular Formula: C15H15N3O2
C.I. Acid Red 2 - Names and Identifiers
| Name | Methyl red chloride |
| Synonyms | Methyl red METHYL RED CI NO 13020 O-Methyl red C.I. Acid Red 2 Methyl red chloride METHYL RED INDICATOR C.I. Acid Red 2 (8CI) METHYL RED MIXED SOLUTION BROMOCRESOL GREEN-METHYL RED BROMOCRESOL GREEN-METHYL RED ETHANOL 5-(dimethylamino)-2-[(E)-phenyldiazenyl]benzoic acid 2-{(E)-[4-(dimethylamino)phenyl]diazenyl}benzoic acid 2-(4-Dimethylaminophenylazo)benzoic acid, 4-Dimethylaminoazobenzene-2μ-carboxylic acid, Acid Red2 |
| CAS | 493-52-7 |
| EINECS | 207-776-1 |
| InChI | InChI=1/C15H15N3O2/c1-18(2)12-8-9-14(13(10-12)15(19)20)17-16-11-6-4-3-5-7-11/h3-10H,1-2H3,(H,19,20)/b17-16+ |
| InChIKey | CEQFOVLGLXCDCX-MSUUIHNZSA-N |
C.I. Acid Red 2 - Physico-chemical Properties
| Molecular Formula | C15H15N3O2 |
| Molar Mass | 269.3 |
| Density | 0.839g/mLat 25°C |
| Melting Point | 179-182 °C (lit.) |
| Boling Point | 412.44°C (rough estimate) |
| Flash Point | 11°C |
| Water Solubility | Practically insoluble in water. Soluble in alcohol, acetic acidSoluble in ethanol. Insoluble in water. |
| Solubility | ethanol: soluble1mg/mL |
| Vapor Presure | 2.89E-10mmHg at 25°C |
| Vapor Density | 9.3 (vs air) |
| Appearance | Solid |
| Color | Reddish-violet |
| Odor | Odorless |
| Maximum wavelength(λmax) | ['410nm, 530nm, 427nm, 519nm'] |
| Merck | 14,6119 |
| BRN | 750102 |
| pKa | 4.95(at 25℃) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Refractive Index | 1.5930 (estimate) |
| MDL | MFCD00002425 |
| Physical and Chemical Properties | Shiny purple crystalline or red-brown powder. Melting point 180-182 °c. Soluble in ethanol, acetic acid, almost insoluble in water. |
C.I. Acid Red 2 - Risk and Safety
| Risk Codes | R10 - Flammable R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R68/20/21/22 - R68 - Possible risk of irreversible effects R36/38 - Irritating to eyes and skin. R23/25 - Toxic by inhalation and if swallowed. R11 - Highly Flammable R36/37/38 - Irritating to eyes, respiratory system and skin. R34 - Causes burns R51/53 - Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R39/23/24/25 - R23/24/25 - Toxic by inhalation, in contact with skin and if swallowed. |
| Safety Description | S36/37 - Wear suitable protective clothing and gloves. S24/25 - Avoid contact with skin and eyes. S22 - Do not breathe dust. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S33 - Take precautionary measures against static discharges. S24 - Avoid contact with skin. S16 - Keep away from sources of ignition. S7 - Keep container tightly closed. S36 - Wear suitable protective clothing. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. |
| UN IDs | UN 1170 3/PG 2 |
| WGK Germany | 1 |
| RTECS | DG8960000 |
| TSCA | Yes |
| HS Code | 29270000 |
| Hazard Class | 3 |
| Packing Group | II |
C.I. Acid Red 2 - Reference
| Reference Show more | 1. He Yu, Wang Shuai, Jin Yi, etc. Effect of natural preservatives on preservation of low-temperature meat products [J]. Jiangsu Agricultural Sciences, 2019, 47(001):177-182. 2. Wan Wen-Juan, Zhang Min-bin, NEI Zhi-yan, et al. Screening, identification and application of decomposing bacteria for high temperature resistant food waste [J]. Food and machinery, 2019(6). 3. Liu Huilin, Wang Yuzhen, Yu Xinyu, etc. Effects of highland barley whole grain and wheat bran on the quality of biscuits [J]. Science and Technology of food industry, 2019, 40(09):62-67. 4. Li Tianyu, Zhang Songshan, Zhang Zhisheng, Zhang Shou, Lei Yuanhua, Xie Peng, Bai Yueyu, Zhang Yang, Sun Baozhong. Variation of edible quality and collagen structure of three kinds of bovine skin during heating [J]. Meat Research, 2020,34(12):18-23. 5. [IF = 2.881] Shuai-Shuai Lv et al."Effects of Additive and oncology Processes on Nitrogen Removal from Aluminum Dross." Coatings. 2022 Jun;12(6):730 6. [IF = 2.881] Shuaish Lv et al."Effects of hydrogen Parameters on AlN Content in Aluminum drop and Multivariate Nonlinear Regression Analysis." Coatings. 2022 May;12(5):552 Note: For some products, we can only provide some information, and we do not guarantee the authority of the information provided, for customer reference and communication purposes only. uses: Methyl red has been used as a pH indicator in glucose biosensors for saliva analysis. storage conditions: RT, protected from light sensitivity: easy to absorb moisture solubility: soluble in ethanol and acetic acid, practically insoluble in water,. The sensitivity of ethanol solution can be significantly reduced due to the esterification of carboxyl groups after long-term storage. Appearance: shiny purple crystalline or red-brown powder Melting Point: 179-182°C methyl red is a chestnut red crystalline azo dye. Methyl red is a pH indicator that changes color at pH 5.5. Methyl red is widely used in saliva sampling methods. In addition, it is also used for carbohydrate and lactic acid detection. Methyl red has been used effectively for the internal differentiation of the Enterobacteriaceae. |
C.I. Acid Red 2 - Wavelength
λmax 410 nm
Last Update：2023-08-16 21:32:38
C.I. Acid Red 2 - Reference Information
| color index | 13020 |
| pH indicator color change ph range | 4.4(red)-6.3(yellow) |
| main applications | Waveguides, LED sensors, photoresists, liquid crystals, sol-gel matrix, optical sensors, paints, toys, detection of thiols, food freshness sensors, Dental product, saliva sampling method, detecting lactic acid, carbohydrates |
| (IARC) carcinogen classification | 3 (Vol. 8, Sup 7) 1987 |
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| use | methyl red is one of the commonly used acid-base indicators. the normal concentration is 0.1% ethanol solution, pH4.4 (red)-6.2 (yellow). It is also used for in vivo staining of protozoa. in vivo staining of protozoa; acid-base indicator, pH color change range 4.4 (red) ~ 6.2 (yellow); titration of ammonia, weak organic bases and alkaloids, but not applicable to organic acids other than oxalic acid and picric acid; it can be mixed with bromocresol green and methylene blue to shorten the color change gamut and improve the sensitivity of color change; adsorption indicator for precipitation titration, such as titration of fluoride ions with thorium nitrate; determination of free chlorine, chlorite and other oxidants protozoa in vivo staining, acid-base indicator (pH 4.4 to 6.2), clinical serum protein biochemical test. The pH color change range is 4.4 (red)-6.2 (yellow). Titration of ammonia, weak organic bases and alkaloids, but not for organic acids other than oxalic acid and picric acid. The indicator can be mixed with bromocresol green and methylene blue to shorten the color gamut and improve the sensitivity of color change. Adsorption indicator for precipitation titration, such as fluoride ion titration with thorium nitrate. Verification of oxidants such as free chlorine and chlorite. |
| Production method | is obtained by diazotization of anthranilic acid and reaction with N,N-dimethylaniline. |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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