2-Amino-1-naphthalenesulfonic acidCAS# 81-16-3 |
Quality Control & MSDS
Number of papers citing our products
Chemical structure
3D structure
| Cas No. | 81-16-3 | SDF | Download SDF |
| PubChem ID | 6670 | Appearance | Powder |
| Formula | C10H9NO3S | M.Wt | 223 |
| Type of Compound | N/A | Storage | Desiccate at -20°C |
| Solubility | Soluble in Chloroform,Dichloromethane,Ethyl Acetate,DMSO,Acetone,etc. | ||
| Chemical Name | 2-aminonaphthalene-1-sulfonic acid | ||
| SMILES | C1=CC=C2C(=C1)C=CC(=C2S(=O)(=O)O)N | ||
| Standard InChIKey | GWIAAIUASRVOIA-UHFFFAOYSA-N | ||
| Standard InChI | InChI=1S/C10H9NO3S/c11-9-6-5-7-3-1-2-4-8(7)10(9)15(12,13)14/h1-6H,11H2,(H,12,13,14) | ||
| General tips | For obtaining a higher solubility , please warm the tube at 37 ℃ and shake it in the ultrasonic bath for a while.Stock solution can be stored below -20℃ for several months. We recommend that you prepare and use the solution on the same day. However, if the test schedule requires, the stock solutions can be prepared in advance, and the stock solution must be sealed and stored below -20℃. In general, the stock solution can be kept for several months. Before use, we recommend that you leave the vial at room temperature for at least an hour before opening it. |
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| About Packaging | 1. The packaging of the product may be reversed during transportation, cause the high purity compounds to adhere to the neck or cap of the vial.Take the vail out of its packaging and shake gently until the compounds fall to the bottom of the vial. 2. For liquid products, please centrifuge at 500xg to gather the liquid to the bottom of the vial. 3. Try to avoid loss or contamination during the experiment. |
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| Shipping Condition | Packaging according to customer requirements(5mg, 10mg, 20mg and more). Ship via FedEx, DHL, UPS, EMS or other couriers with RT, or blue ice upon request. | ||
2-Amino-1-naphthalenesulfonic acid Dilution Calculator
2-Amino-1-naphthalenesulfonic acid Molarity Calculator
| 1 mg | 5 mg | 10 mg | 20 mg | 25 mg | |
| 1 mM | 4.4843 mL | 22.4215 mL | 44.843 mL | 89.6861 mL | 112.1076 mL |
| 5 mM | 0.8969 mL | 4.4843 mL | 8.9686 mL | 17.9372 mL | 22.4215 mL |
| 10 mM | 0.4484 mL | 2.2422 mL | 4.4843 mL | 8.9686 mL | 11.2108 mL |
| 50 mM | 0.0897 mL | 0.4484 mL | 0.8969 mL | 1.7937 mL | 2.2422 mL |
| 100 mM | 0.0448 mL | 0.2242 mL | 0.4484 mL | 0.8969 mL | 1.1211 mL |
| * Note: If you are in the process of experiment, it's necessary to make the dilution ratios of the samples. The dilution data above is only for reference. Normally, it's can get a better solubility within lower of Concentrations. | |||||
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Reversed-phase liquid chromatographic determination of two manufacturing intermediates in D&C Red No. 34 and its lakes.[Pubmed:20166580]
J AOAC Int. 2009 Nov-Dec;92(6):1639-43.
A reversed-phase LC method was developed to determine two manufacturing intermediates in the monosulfo monoazo color additive D&C Red No. 34 and its lakes. The analytes are 2-Amino-1-naphthalenesulfonic acid (Tobias acid) and 3-hydroxy-2-naphthalenecarboxylic acid (3-hydroxy-2-naphthoic acid). This method can be used for batch certification of the color additives by the U.S. Food and Drug Administration to ensure that each lot meets published specifications for coloring drugs and cosmetics. The new method uses lithium oxalate in methanol-water to dissolve the color additives for analysis. The analytes were identified by comparison of their LC retention times and UV absorption spectra with those of standards. Peak area calibrations were generally linear (R > 0.999) and recoveries were 105% for Tobias acid and 103% for 3-hydroxy-2-naphthoic acid. The limits of determination (LOD) were 0.01% for Tobias acid and 0.03% for 3-hydroxy-2-naphthoic acid. The RSDs at the specification levels were 0.9% for Tobias acid and 3.2% for 3-hydroxy-2-naphthoic acid. Survey analyses of 14 samples of certified D&C Red No. 34 straight colors and lakes from six domestic and foreign manufacturers yielded results for Tobias acid that generally agreed with results previously obtained by using a gravity elution column chromatographic method. Nine of the results for 3-hydroxy-2-naphthoic acid were 2 to 5 times higher than the results obtained using the column chromatographic method. We attribute the lower accuracy of the column chromatographic method to incomplete solubility of the samples using the method conditions and difficulty with interpreting the UV spectrophotometric results.
