Abstract
Tartrazine, better known as food coloring FD&C Yellow #5, lends its sunny hue to foods like powdered chicken broth and pancake mix. But the compound may someday be key to 3-D printing new organs. Researchers have shown they can create structures with blood vessel networks and organ-like topologies using biocompatible hydrogels loaded with tartrazine (Science 2019, DOI: 10.1126/science.aav9750). Rice University’s Jordan S. Miller, University of Washington’s Kelly R. Stevens, and colleagues printed these structures using an established technique favored by the microprocessor industry and others. Called projection stereolithography, the technique involves polymerizing material using blue light, one thin layer at a time. Going from bottom to top, the layers get built up to create the final structure. To make the technique work, researchers must keep the light confined to a single layer so it doesn’t penetrate layers put down previously, polymerizing them in off-target spots. The microprocessor industry preven...
Published Version
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