Degradation in soil within one year: Scientists have discovered Pac Man enzyme that "eats plastic", which can degrade plastics and show significant differentiation from conventional plastics

Soil test: Biodegradable plastics completely decompose within about a year. According to ScienceDaily, scientists have discovered a bacterial enzyme called “Pac Man enzyme” that can help bacteria “engulf” certain types of plastics, providing new research hope for addressing plastic pollution. The report points out that the research team observed that several biodegradable plastics completely decompose in soil within about a year, while conventional plastics remain largely unchanged. The significance of this comparative result is that it advances the concept of “degradability” from the material label level to the observation of its performance in actual soil environments. For the chemical and plastic industries, degradation performance is no longer just an additional item in formula design, but a performance indicator closely related to usage scenarios and post disposal pathways. Especially in a circular material system, whether the material can be utilized by microorganisms in a specific environment directly affects its end destination and overall environmental performance.

“Pac Man enzyme” reveals clues to the mechanism of microbial involvement in plastic decomposition

The report describes this enzyme as a key factor in helping bacteria decompose specific plastics, but does not elaborate on its specific structure, substrate range, or degradation intermediates.

. Based on the disclosed information, it can be confirmed that some biodegradable plastics have achieved rapid and complete decomposition in soil, while conventional plastics have not shown significant changes under the same conditions. This indicates a significant difference between the chemical structure of plastics and their biodegradability in the natural environment, providing a verifiable observational basis for “degradable design” in green manufacturing. From the perspective of the polymer additive industry, this discovery prompts us to pay attention to two aspects. Firstly, the formulation system of biodegradable plastics often involves a balance between degradation promoting components, stable systems, and mechanical properties; The result of complete decomposition in soil within one year means that such materials may enter biogeochemical cycles faster after being discarded. Secondly, if the mechanism of action between enzymes and bacteria can be further elucidated, it may provide ideas for the design of sustainable additives, such as regulating the hydrophilicity and microbial adhesion of material surfaces through additives, thereby affecting the degradation initiation rate.

Inspiration for Recycling Materials and Low Carbon Pathways

There are usually two parallel paths for plastic pollution control: one is physical recycling and chemical recycling, which turns waste plastics back into recycling materials; The second is that biodegradable materials undergo biodegradation in specific environments. The soil test results reported this time add empirical cases to the second path, but it does not equate to universal conclusions for all environmental conditions. The report did not specify the conditions of soil type, temperature, humidity, and plastic sample thickness for the experiment, so it cannot be inferred that biodegradable plastics can completely decompose within one year in any natural environment. For the industry, a more practical significance is that the promotion of biodegradable plastics needs to be matched with end of pipe disposal conditions, and the balance between degradation performance and usability needs to be considered at the formulation stage. Green manufacturing is not only about reducing carbon emissions in the production process, but also about allowing materials to return to nature in a lower environmental load after being discarded. If the mechanism related to “Pac Man enzyme” is further clarified, new design references may be obtained in the field of sustainable additives and regenerated polymers. However, at this stage, it should still be regarded as a research progress worth tracking, rather than a conclusion that can be directly industrialized.

Information still needs to be clarified

The report did not disclose the specific names and classifications of research institutions, published journals, and enzymes, nor did it provide detailed methods and detection standards for soil testing.

. The specific materials referred to as “several biodegradable plastics”, the reference types of conventional plastics, and the criteria for determining complete decomposition within one year have not been explained. These information gaps mean that caution should be exercised when citing this result, avoiding expanding it into a general judgment of all biodegradable plastics or all soil environments.

Information source:Scientists discover a plastic-eating “Pac-Man” enzyme with a surprising secret， Organized by Herun Chemical.