Storage and Timed Release of Acetaminophen from Porous Carbonaceous Materials

Sarah E. McCary, Thomas R. Rybolt

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Department of Chemistry, University of Tennessee at Chattanooga, Chattanooga, USA.

DOI: 10.4236/ojpc.2013.32010                

Abstract

Six carbon powders with varied surface areas and porosities were used to store and release acetaminophen (ACT). A 10 mg/mL solution of acetaminophen in phosphate buffer solution (pH = 7.0) at 25℃ with exposure to carbon powder for 72 hours was used to drive the maximum loading of acetaminophen into the powders. Carboxen 1012 (BET surface area of1500 m²/g) powder exhibited the greatest maximum adsorption of ACT (up to 62% by mass). The maximum ACT adsorption was correlated with surface area and porosity. The most effective carbon powders for binding ACT were ones containing high mesopore volumes. Loaded carbon powder was separated from the ACT solution and then phosphate buffer solution (pH = 7.0) was combined with the loaded carbon powder and ACT absorbance readings at 243 nm were taken over time. The various carbon powders were able to release a portion of the ACT that they originally adsorbed. The Carboxen 1012 powder displayed the greatest ACT release with a rapid initial release followed by a steady but slightly declining release over a time period of 2 to 11 weeks. The results were supportive of mesoporous carbons such as Carboxen 1012 being suitable for drug loading and release.

Keywords

Carbon Powders; Drug Release; Adsorption of Acetaminophen; Mesoporosity; Storage of Acetaminophen

Conflicts of Interest

The authors declare no conflicts of interest.

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