Department of Marine Science, School of Marine Sciences, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India.
Department of Marine Science, School of Marine Sciences, Bharathidasan University, Tiruchirappalli 620 024, Tamil Nadu, India.
Mar Pollut Bull. 2023 May;190:114889. doi: 10.1016/j.marpolbul.2023.114889. Epub 2023 Mar 31.
The present study dealt with the five marine microalgae strains viz., Chloroidium saccharophilum, Picochlorum maculatum, Amphora sp., Hymenomonas globosa and Limnospira indica and their effective degradation ability of Low-Density Polyethylene for the period of 45 days. The incubation of LDPE in microalgae culture has resulted in the maximum weight loss (20.16 ± 0.14 %), higher reduction rate (0.005/day) and lower half-life (138.4 days) in the LDPE treated with P. maculatum. The SEM images of all treated LDPE revealed surface erosion and the ATR-FTIR spectra showed functional group peaks along with new peaks at 1369.35 cm, 2332.96 cm and 500-726 cm. Carbonyl (Keto, Ester), Vinyl and Internal double bond indices increased significantly in all the treated groups. The crystallinity was decreased (64.13 %) in P. maculatum treated LDPE than the control (71.37 %). Thermogravimetric analysis showed the reduction in thermal stability after biodegradation. This efficient microalgal degradation as a bioremediation technique will reduce the plastic pollution.
本研究涉及五种海洋微藻菌株，即绿球藻、微小聚球藻、钟形藻、圆筛藻和印度腔球藻，以及它们对低密度聚乙烯（LDPE）的有效降解能力，为期 45 天。在微藻培养物中孵育 LDPE 导致用微小聚球藻处理的 LDPE 产生最大的重量损失（20.16±0.14%）、更高的减少率（0.005/天）和更低的半衰期（138.4 天）。所有处理过的 LDPE 的 SEM 图像均显示表面侵蚀，ATR-FTIR 光谱显示功能基团峰以及在 1369.35 cm、2332.96 cm 和 500-726 cm 处出现新峰。所有处理组的羰基（酮、酯）、乙烯基和内部双键指数均显著增加。与对照（71.37%）相比，用微小聚球藻处理的 LDPE 的结晶度降低（64.13%）。热重分析表明，生物降解后热稳定性降低。这种有效的微藻降解作为一种生物修复技术将减少塑料污染。
