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I. Colon and S. M. Richoll, “Determination of Methyl and Ethyl Esters of Methanesulfonic, Benzenesulfonic and P-Toluenesulfonic Acids in Active Pharmaceutical Ingredients by Solid-Phase Microextraction (SPME) Coupled to GC/SIM-MS,” Journal of Pharmaceutical and Biomedical Analysis, Vol. 39, No. 3-4, 2005, pp. 477-485.
http://dx.doi.org/10.1016/j.jpba.2005.04.037

has been cited by the following article:

• TITLE: Low Level Determination of Genotoxic Impurity in Deferasirox Formulation

  AUTHORS: Pravish Kumar Tiwari, Padmakar Sathe, Navin Devadiga

  KEYWORDS: Deferasirox; Genotoxic; 4-Hydrazinobenzoic Acid; HPLC

  JOURNAL NAME: Journal of Analytical Sciences, Methods and Instrumentation, Vol.3 No.4, October 22, 2013

  ABSTRACT: 4-hydrazinobenzoic acid has been highlighted as one of the potential genotoxic impurities (PGIs). A sensitive HPLC method was developed and validated for the determination of 4-hydrazino benzoic acid in Deferasirox Tablet. HPLC method on Zorbax SB C18 column (250 × 4.6 mm i.d.), 5 μm, with UV Detector was used. The proposed method was cost effective, specific, linear, accurate, rugged and precise. The calibration curves showed good linearity over the concentration range of 0.5 μg/ml to 1.5 μg/ml with respect to the sample. The correlation coefficient was 0.999. Excellent recoveries of 102% were obtained at the level 0.5 μg/ml.