In a rare example, Masood (2007) investigated the influence of co

In a rare example, Masood (2007) investigated the influence of compactness of a 3D printed model tablets and the inter-filament space on dye penetration through the printed tablets. More recently, Sandler et al. (2014b) demonstrated the fabrication of an anti-biofilm medical device using a 3D printer and antibacterial loaded PVA filaments. Goyanes et al. (2014) investigated

the influence of changing the degree of infill percentage on fluorescein release from cylindrical matrix. However, limited research is available on the use of FDM in the fabrication of dosage forms as well as the accuracy of weight and dosage of this manufacturing technique. The aim of this work see more is to investigate the feasibility of producing extended-release prednisolone tablets as well as controlling the dose via digital manipulation of the printed volume. Poly(vinyl

alcohol) (PVA) is biodegradable and widely used in the pharmaceutical field as an extended release matrix for oral delivery (Carstensen et al., 1981), transdermal patches (Wan and Lim, 1992) as well as mucoadhesive and viscosity enhancer for ocular preparations (Davies SRT1720 order et al., 1991 and Wilson et al., 1983). The availably of PVA as a filament for 3D printer enabled its use as a model polymer in this study. Prednisolone was purchased from Severn Biotech Ltd (Kidderminster, UK). Polyvinyl alcohol (PVA) filaments (melting point 160–170 °C, specific heat 0.4 Cal/g °C, density 1.25–1.35 g/cm3) were purchased from Reprapcentral (UK). Glycerol, acetonitrile and methanol were supplied by British Drug Houses (BDH, London, UK). Scotch blue painter’s tape 50 mm was supplied by 3 M (Bracknell, UK). PVA filaments were loaded with prednisolone via incubation in a saturated solution of prednisolone in methanol at 30 °C for 24 h. After which, the filaments were dried in over at 40 °C and weighed

every 1 h until a stable weight obtained. To assess loading efficiency, three representative samples of PVA (100 mg) were incubated in 100 ml of 1:1 methanol: water mixture under sonication for 2 h and were assessed using HPLC as detailed in Section 2.5. The loading percentage of the filament was calculated as shown in Eq. (1). equation(1) Loading percentage(S)=100×Mass of prednisoloneTotal mass of filament Blank and drug loaded Cell press PVA tablets were designed in an ellipse shape using Autodesk® 3ds Max® Design 2012 software version 14.0 (Autodesk, Inc., USA) and saved in STL format (Fig. 1a and b). The design was imported to the 3D printer’s software, MakerWare Version 2.4.0.17 (MakerBot Industries, LLC., USA) (Fig. 1). A series of tablets with increasing volumes were printed by modifying the dimensions of the design: length × width × heights (L, H, W) without altering the ratios between these dimensions (W = H = 0.4 L). The volume of the design (V) was calculated as: equation(2) V=πL2W2H=0.

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