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Open AccessArticle

Vibrational Spectroscopy for Cocrystals Screening. A Comparative Study

LAQV/REQUIMTE, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Rua Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
Research Institute for Medicines (iMed.Lisboa), Faculdade de Farmácia, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal, [email protected]
Author to whom correspondence should be addressed.
Academic Editor: Torsten Frosch
Molecules 2018, 23(12), 3263;
Received: 7 November 2018 / Revised: 28 November 2018 / Accepted: 7 December 2018 / Published: 10 December 2018
A recurrent problem faced by the pharmaceutical industry when formulating drug products concerns poorly soluble drugs, which, despite having desirable pharmacological activity, present limited bioavailability. Cocrystallization is growing up as a possible approach to tackle this problem. Cocrystals are crystalline materials comprising at least two components, solid at room temperature, and held together by non-covalent bonds. The increasing interest in these compounds is steadily demanding faster, simpler, and more reliable methods for the task of screening new cocrystals. This work aims at comparing the performance of three vibrational spectroscopy techniques (mid infrared, near infrared, and Raman spectroscopy) for cocrystals screening. Presented results are based on hydrochlorothiazide, a poorly soluble drug belonging to class IV of the Biopharmaceutical Classification System. The implemented cocrystal screening procedure tested six coformers (all considered safe for human administration) added according to a drug:coformer ratio of 1:1 and 1:2 and seven solvents with different polarity. The screening method chosen was based on slurry cocrystallization performed by sonication (ultrasound assisted) in a 96-well plate. Results show that all evaluated vibrational spectroscopy techniques provided important information regarding cocrystal formation, including information on the groups involved in the cocrystallization and purity, and can be used for the screening task. View Full-Text
Keywords: pharmaceutical cocrystals; screening; cocrystallization by sonication; mid infrared spectroscopy; near infrared spectroscopy; Raman spectroscopy pharmaceutical cocrystals; screening; cocrystallization by sonication; mid infrared spectroscopy; near infrared spectroscopy; Raman spectroscopy
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MDPI and ACS Style

Rodrigues, M.; Lopes, J.; Sarraguça, M. Vibrational Spectroscopy for Cocrystals Screening. A Comparative Study. Molecules 2018, 23, 3263.

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