title: Freeform drop-on-demand laser printing of 3D alginate and cellular constructs.
abstract: Laser printing is an orifice-free printing approach and has been investigated for the printing of two-dimensional patterns and simple three-dimensional (3D) constructs. To demonstrate the potential of laser printing as an effective bioprinting technique, both straight and Y-shaped tubes have been freeform printed using two different bioinks: 8% alginate solution and 2% alginate-based mouse fibroblast suspension. It has been demonstrated that 3D cellular tubes, including constructs with bifurcated overhang structures, can be adequately fabricated under optimal printing conditions. The post-printing cell viabilities immediately after printing as well as after 24 h incubation are above 60% for printed straight and Y-shaped fibroblast tubes. During fabrication, overhang and spanning structures can be printed using a dual-purpose crosslinking solution, which also functions as a support material. The advancement distance of gelation reaction front after a cycle time of the receiving platform downward motion should be estimated for experimental planning. The optimal downward movement step size of receiving platform should be chosen to be equal to the height of ungelled portion of a previously printed layer.
authors.affiliation: Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL 32611, USA.
authors.forename: Ruitong
authors.initials: R
authors.lastname: Xiong
authors.forename: Zhengyi
authors.initials: Z
authors.lastname: Zhang
authors.forename: Wenxuan
authors.initials: W
authors.lastname: Chai
authors.forename: Yong
authors.initials: Y
authors.lastname: Huang
authors.forename: Douglas B
authors.initials: DB
authors.lastname: Chrisey
mesh_terms: D000464:Alginates / Q000737:chemistry*; D000818:Animals; D002470:Cell Survival; D005782:Gels; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D007091:Image Processing, Computer-Assisted; D007834:Lasers; D051379:Mice; D041681:NIH 3T3 Cells; D066330:Printing, Three-Dimensional; D054457:Tissue Scaffolds / Q000737:chemistry
chemical_list: D000464:Alginates; D005782:Gels; D006603:Hexuronic Acids; D020723:Glucuronic Acid