API determination by NIR spectroscopy across pharmaceutical production process

Marcel Blanco, M. Bautista, M. Alcalà

Research output: Contribution to journalArticleResearchpeer-review

34 Citations (Scopus)


The purpose of this research was to demonstrate the ability of reflectance near-infrared (NIR) spectroscopy for quantitative analysis of an active ingredient in different production steps of a solid formulation. The drug is quantified at two different steps of a pharmaceutical process: after granulation and after tablet coating. Calibration samples were prepared by mixing pure drug, excipients, and batch samples (75-120 mg/g active ingredient) using a simple methodology that can be easily carried out in a laboratory. Partial least squares calibration models were calculated in second-derivative mode using the wavelength range 1,134-1,798 nm. The error of prediction for granulated samples was 1.01% and 1.63% for tablets. The results prove that NIR spectroscopy is a good alternative to other, more time-consuming means of analysis for pharmaceutical process monitoring. © American Association of Pharmaceutical Scientists 2008.
Original languageEnglish
Pages (from-to)1130-1135
JournalAAPS PharmSciTech
Issue number4
Publication statusPublished - 14 Nov 2008


  • API determination
  • NIR spectroscopy
  • PAT
  • PLS calibration
  • Tablet content uniformity


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