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Pharmaceutical Secondary Standard; Certified Reference Material

4-Aminophenyl sulfone, Bis(4-aminophenyl) sulfone, 4,4′-Diaminodiphenyl sulfone, Dapsone, DDS, 4,4′-Sulfonyldianiline
Linear Formula:
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Quality Level


certified reference material
pharmaceutical secondary standard


current certificate can be downloaded


pkg of 1 g


HPLC: suitable
gas chromatography (GC): suitable


175-177 °C (lit.)


pharmaceutical (small molecule)



pharmacopeia traceability

traceable to BP 102
traceable to PhEur D0100000
traceable to USP 1164008

storage temp.


SMILES string




InChI key


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General description

Dapsone is an antibacterial drug, belongs to a class of compounds known as sulfones. It acts by inhibiting the synthesis of dihydrofolic acid through competition with para-aminobenzoate for the active site of dihydropteroate synthetase, thereby inhibiting the growth of microorganisms that are dependent on endogenous folic acid synthesis. It is used in primary treatment of dermatitis herpetiformis and in combination with other drugs to treat leprosy.
Pharmaceutical secondary standards for application in quality control, provide pharma laboratories and manufacturers with a convenient and cost-effective alternative to the preparation of in-house working standards.


Dapsone may be used as a pharmaceutical reference standard for the determination of the analyte in bulk drug and pharmaceutical formulations by chromatography.
These Secondary Standards are qualified as Certified Reference Materials. These are suitable for use in several analytical applications including but not limited to pharma release testing, pharma method development for qualitative and quantitative analyses, food and beverage quality control testing, and other calibration requirements.

Analysis Note

These secondary standards offer multi-traceability to the USP, EP and BP primary standards, where they are available.

Other Notes

This Certified Reference Material (CRM) is produced and certified in accordance with ISO 17034 and ISO/IEC 17025. All information regarding the use of this CRM can be found on the certificate of analysis.


To see an example of a Certificate of Analysis for this material enter LRAA3012 in the slot below. This is an example certificate only and may not be the lot that you receive.

Signal Word


Hazard Statements

Hazard Classifications

Acute Tox. 4 Oral - Aquatic Chronic 2 - STOT RE 2 - STOT SE 1

Target Organs


Storage Class Code

6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects



Certificate of Analysis

Certificate of Origin

Dapsone and sulfones in dermatology: overview and update
Zhu YI and Stiller MJ
Journal of the American Academy of Dermatology, 45(3), 420-434 (2001)
An ecofriendly and stability-indicating RP-HPLC method for determination of dapsone: Application to pharmaceutical analysis
Beheshti ML, et al.
Chiang Mai Journal of Science, 43(3), 620-629 (2016)
Validated TLC and HPLC stability-indicating methods for the quantitative determination of dapsone
Salama N, et al.
JPC-Journal of Planar Chromatography-Modern TLC, 25(1), 65-71 (2012)
Chunjuan Yang et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 960, 59-66 (2014-05-03)
Corynoline and acetycorynoline are active compounds of Corydalis bungeana Turcz. with various pharmacological effects such as sedation, anti-leptospira and liver injury protection effects. A specific, simple and sensitive UHPLC-ESI-MS/MS method was developed and validated for the pharmacokinetic study of corynoline
Hom-Lay Wang et al.
Journal of periodontology, 85(12), 1693-1701 (2014-06-27)
The purpose of this multicenter randomly controlled clinical trial was to compare two acellular dermal matrix (ADM) materials produced by different processing techniques, freeze-dried (FDADM) and solvent-dehydrated (SDADM) ADM, in their ability to correct Miller Class I and II recession

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