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Pharmaceutical Secondary Standard; Certified Reference Material

IB, (±)-2-(4-Isobutylphenyl)propanoic acid, IBU, α-Methyl-4-(isobutyl)phenylacetic acid
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
EC Number:
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PubChem Substance ID:

Quality Level


certified reference material
pharmaceutical secondary standard


current certificate can be downloaded


HPLC: suitable
gas chromatography (GC): suitable

Featured Industry

Pharmaceutical (small molecule)



pharmacopeia traceability

traceable to BP 539
traceable to PhEur I0020000
traceable to USP 1335508

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InChI key


Gene Information

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General description

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.
Ibuprofen is a substituted arylpropionic acid, used as a non-steroidal anti-inflammatory drug (NSAID).


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.
Ibuprofen may be used as a pharmaceutical reference standard for the determination of the analyte in pharmaceutical formulations by spectrophotometry and chromatography techniques.
Ibuprofen may be used as a standard in the quantitative determination of ibuprofen in samples of human plasma using high performance liquid chromatography (HPLC). It may also be used as a reference standard in the determination of ibuprofen in dog plasma using liquid chromatography (LC).

Biochem/physiol Actions

Cyclooxygenase (COX) inhibitor that has greater activity against COX-1 than against COX-2.
Cyclooxygenase (COX) inhibitor that has greater activity against COX-1 than against COX-2.

Analysis Note

These secondary standards offer multi-traceability to the USP, EP (PhEur) 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 LRAC0253 in the slot below. This is an example certificate only and may not be the lot that you receive.


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Hazard Statements

Hazard Classifications

Acute Tox. 4 Oral - Eye Irrit. 2 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

11 - Combustible Solids



Certificate of Analysis

Certificate of Origin

Spectrofluorometric determination of ibuprofen in pharmaceutical formulations
Damiani PC, et al.
Journal of Pharmaceutical and Biomedical Analysis, 25(3-4), 679-683 (2001)
Simultaneous determination of ibuprofen and hydroxypropylmethylcellulose (HPMC) using HPLC and evaporative light scattering detection
Whelan MR, et al.
Journal of Pharmaceutical and Biomedical Analysis, 30(4), 1355-1359 (2002)
Simultaneous determination of caffeine, paracetamol, and ibuprofen in pharmaceutical formulations by high-performance liquid chromatography with UV detection and by capillary electrophoresis with conductivity detection
Cunha RR, et al.
Journal of Separation Science, 38(10), 1657-1662 (2015)
Determination of ibuprofen in human plasma by high-performance liquid chromatography
Litowitz H, et al.
Journal of Chromatography. B, Biomedical Sciences and Applications, 311, 443-448 (1984)
Simultaneous spectrophotometric determination of pseudoephedrine hydrochloride and ibuprofen in a pharmaceutical preparation using ratio spectra derivative spectrophotometry and multivariate calibration techniques
Palabiyik IM, et al.
Journal of Pharmaceutical and Biomedical Analysis, 34(3), 473-483 (2004)

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