Yeast and plant fatty acids produce durable recyclable plastic; conversion into biodiesel


Dr. Richard Gross, professor of chemical and biological science at Polytechnic Institute of New York University (NYU-Poly), has developed a method for producing a strong, highly ductile bioplastic using yeast and fatty acids of plant oils. The findings were published in the Journal of the American Chemical Society.

Like all plastics, the new material is a polymer—a large molecule comprising smaller, repeating units called monomers. The monomer itself is relatively new. The units are called omega-hydroxyfatty acids, and when strung together to form a polymer, they can produce a biologically friendly plastic. Until now, omega-hydroxyfatty acids were difficult and expensive to produce using traditional methods, prohibiting their widespread use.

Gross produced the monomer in a first-of-its-kind fermentation process, a fairly quick, low-cost method. The monomer is then polymerized to form a uniquely ductile, strong natural plastic that biodegrades completely in soil.

Gross and his team devised a new way to produce these monomers by using a genetically modified strain of the yeast Candida tropicalis. The engineered yeast is capable of converting fatty acids of plant oils into large quantities of omega-hydroxyfatty acids. When polymerized, the new material may be a suitable substitute for petroleum derived plastics such as polyethylene for uses such as disposable gloves, multilayer food packaging films, and films for ice, trash, garments, produce bags and more.

"This is a very exciting development in the field, and not just because we’ve created a bioplastic with desirable properties. This process uses no fossil fuels, and every step is biologically-friendly, from fatty acids in plant oils through the end product, which is a versatile, 100 percent biodegradable plastic."

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