Abstract
The generation of liquefied poly-ɛ-caprolactone (PCL) droplets by means of a microfluidic device results in uniform-sized microspheres, which are validated as microcarriers for human embryonic stem cell culture. Formed droplet size and size distribution, as well as the resulting PCL microsphere size, are correlated with the viscosity and flow rate ratio of the dispersed (Q d) and continuous (Q c) phases. PCL in dichloromethane increases its viscosity with concentration and molecular weight. Higher viscosity and Q d/Q c lead to the formation of larger droplets, within two observed formation modes: dripping and jetting. At low viscosity of dispersed phase and Q d/Q c, the microfluidic device is operated in dripping mode, which generates droplets and microspheres with greater size uniformity. Solutions with lower molecular weight PCL have lower viscosity, resulting in a wider concentration range for the dripping mode. When coated with extracellular matrix (ECM) proteins, the fabricated PCL microspheres are demonstrated capable of supporting the expansion of human embryonic stem cells.
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The authors would like to acknowledge funding from the Joint Council Office, as well as support from the Institute of Materials Research and Engineering and the Bioprocessing Technology Institute of the Agency for Science, Technology and Research (A*STAR), Singapore.
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Li, J., Lam, A.TL., Toh, J.P.W. et al. Fabrication of uniform-sized poly-ɛ-caprolactone microspheres and their applications in human embryonic stem cell culture. Biomed Microdevices 17, 105 (2015). https://doi.org/10.1007/s10544-015-0010-6
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DOI: https://doi.org/10.1007/s10544-015-0010-6