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Biodegradable Polymer Development from Waste Glycerol

Explore the innovative process of creating biodegradable polymers from waste glycerol, citric acid, and cinnamic acid for biomedical applications. Discover the technical details and potential uses of the developed materials.

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Biodegradable Polymer Development from Waste Glycerol

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  1. Benito Stradi, PhD. † and Lee R. Madsen II† ‡, Research †LSU AgCenter, Audubon Sugar Institute, ‡ LSU Dept. of Chemistry Beer cups to Biotech Funded by the American Sugarcane League

  2. It Takes Glycerol to make PolymerBiodegradable “Extracellular Matrices” (ECMs) • The current political gambit is to shoot for 35 billion gal. of renewable liquid fuel by 2015. Of this, 14 billion gal. diesel range fuels will be needed. • Production of this much biodiesel will produce ~1.2 billion gal. of waste glycerol/a. • Here, we briefly describe our attempt to make a high value, biomedical product from waste glycerol, citric acid, and cinnamic acid.

  3. Expanded Biorefinery Concept: Sugar, Fuel and Chemicals from CANE. Cinnamic Acid Aconitic Acid* *Citric acid readily dehydrates to yield aconitic acid

  4. ECM* powder and Growing a Finger Associated Press. (2007). “Regeneration recipe: Pinch of pig, cell of lizard: Researchers look to porcine bladders, salamanders, mice to regrow limbs.” http://www.msnbc.msn.com/id/17171083/ Ritter, M. (2007). “A Growing Notion: Scientists work to help humans regenerate parts of themselves.” March 25. http://www.jsonline.com/story/index.aspx?id=581474 *From basement membrane derived from porcine bladder

  5. “…it was Buck Rogers science to talk about regenerating tissues”…“This is the new wave.”* Spc. Robert Acosta. Banerjee, N. “Rebuilding Bodies and lives, Maimed by War”(2003). New York Times, 11-16-03. *Winslow, R. “Matrix Reloaded: Doctors Try New Techniques to Regrow Human Tissue” (2007). The Wall Street Journal Online, 02-02-07.

  6. “Pork-Free” Biodegradable “ECMs” from Biowaste and Unrecovered Products • Determine if a photo-crosslinking polymer matrix can be made from the given chemicals. It must: • Be biodegradable • Made from waste or unclaimed product • Be subject to lithography with UV light • Suitable for in-vivo applications • Photopattern and determine if cells will grow in an oriented way.

  7. Results: • All of 10 mixtures yielded pre-cure, a highly viscous fluid. These materials depolymerize on exposure to moist air. • On curing, tough vitreous (often clear) material results. This material is stable in moist air. • They rubberize at >100°C, but do not melt. The rubber-phase is elastic and recovers on deformation. • These materials will form firm (Jellotm-like) gels in either water or THF. • They are photochemically reactive. Higher CnA loadings are needed for cross-linking in gel phase.

  8. Pre-gelled PLMs: • Can be patterned using UV and a resist • Can draw “hard” spots with a UV laser • Yeast will eat this directly • Gels in 24-72hr, depending on formulation • Can be cast into shapes before curing. There is little shrinkage on curing.

  9. Gelled PLMs: • Soft, firm gels • Yeast will eat it. • Depolymerizes in water in about 1.5 months. • Can be used for Tissue scaffolds and/or drug delivery

  10. Photocrosslinked PLMs: • Cross Linked polymer is yellow, and green under UV. • There is significant penetration of the crosslinked domains • Can be gelled with hard “puckers” where crosslinked. Cross-linked 1.5 mm

  11. More Common Uses! • The resin can be tuned to comply more with normal plastic. • Fibers can be drawn from the resin and cured. • Resin can be cast into a variety of shapes and then cured with heat and light.

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