Authors: Jurischka, Christoph | Dinter, Franziska | Efimova, Anastasia | Weiss, Romano | Schiebel, Juliane | Schulz, Christian | Fayziev, Bekzodjon | Schierack, Peter | Fischer, Thomas | Rödiger, Stefan
Article Type:
Research Article
Abstract:
BACKGROUND: The 3D printing is relevant as a manufacturing technology of functional models for forensic, pharmaceutical and bioanalytical applications such as drug delivery systems, sample preparation and point-of-care tests. OBJECTIVE: Melting behavior and autofluorescence of materials are decisive for optimal printing and applicability of the product which are influenced by varying unknown additives. METHODS: We have produced devices for bioanalytical applications from commercially available thermoplastic polymers using a melt-layer process. We characterized them by differential scanning calorimetry, fluorescence spectroscopy and functional assays (DNA capture assay, model for cell adhesion, bacterial adhesion and biofilm formation test).
…RESULTS: From 14 tested colored, transparent and black materials we found only deep black acrylonitrile-butadiene-styrene (ABS) and some black polylactic acid (PLA) useable for fluorescence-based assays, with low autofluorescence only in the short-wave range of 300–400 nm. PLA was suitable for standard bioanalytical purposes due to a glass transition temperature of approximately 60°C, resistance to common laboratory chemicals and easy print processing. For temperature-critical methods, such as hybridization reactions up to 90°C, ABS was better suited. CONCLUSIONS: Autofluorescence was not a disadvantage per se but can also be used as a reference signal in assays. The rapid development of individual protocols for sample processing and analysis required the availability of a material with consistent quality over time. For fluorescence-based assays, the use of commercial standard materials did not seem to meet this requirement.
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Keywords: 3D printing, cell adhesion, autofluorescence, polylactic acid, PLA, polyethylene terephthalate glycol, PETG, acrylonitrile-butadiene-styrene, ABS, thermoplastic
polyurethane elastomers, TPU, medicine, pharmaceutical
DOI: 10.3233/CH-190713
Citation: Clinical Hemorheology and Microcirculation,
vol. 75, no. 1, pp. 57-84, 2020
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