Optimization of fermentation conditions for PLA strains

Abstract

Since the world entered the 21st century, the rapid development of science and technology and economy, environmental problems and energy depletion have become increasingly serious, and with the promulgation of a series of national plastic restrictions, people have begun to pay more and more attention to degradable materials, the so-called degradable materials, that is, materials that can be completely decomposed by bacteria and other microorganisms in a suitable natural environment, can be a good alternative to plastic products. One of the most popular materials is polylactic acid (PLA), a polymer polymerized from lactic acid as the main raw material, which is made from renewable plant resources (such as straw) from a synthetic point of view. There are several methods for the production of PLA, such as direct polycondensation method, two-step method, which not only has the characteristics of existing plastic polyethylene, polypropylene, polystyrene propylene and other materials, but also has degradability. It is clear that there is a plenty of advantages and applications of PLA, the use of it has many limitations, for example high cost etc. This paper aims to construct a suitable fermentation strain by collating relevant research papers at home and abroad, and then conduct a single factor experiment to find the most suitable fermentation conditions, in order to achieve the improvement of yield and quality.