PDF(Pubmed)
Abstract：
A degradation mechanism of polystyrene (PS) in mealworms reared on expanded PS (EPS) was investigated by its decrease in molecular weight and change in chemical structure. A 33% decrease in molecular weight was observed for the digested PS in the frass after 1 week of feeding to mealworms. The FT-IR and py-GC/MS spectra of the digested PS showed radical oxidative reactions taking place in the mealworm body. The presence of hydroperoxide, alcohol and phenol groups was confirmed, and dimer fragments of styrene with quinone and phenol groups were obtained. The decrease in molecular weight and the alternation of benzene rings indicated that autoxidation and quinonization via phenolic intermediates occurred simultaneously in the mealworm body. The survival rate of mealworms reared on EPS was higher than that of starved worms, indicating that EPS was a nutrient source. However, no weight gain was observed in mealworms fed EPS alone. Comparison with the mixed diets with bran or urethane foams (PU) indicated that protein, phosphorus and magnesium components absent from EPS were required for mealworm growth.
摘要：
通过降低分子量和改变化学结构，研究了聚苯乙烯（PS）在膨胀PS（EPS）上饲养的粉虫中的降解机理。在饲喂粉虫1周后，观察到消化的PS的分子量降低了33％。消化的PS的FT-IR和py-GC/MS光谱显示，在粉虫体内发生了自由基氧化反应。氢过氧化物的存在，确认了醇和苯酚基团，并获得了带有醌和苯酚基团的苯乙烯的二聚体片段。分子量的降低和苯环的交替表明，在粉虫体内同时发生了通过酚类中间体的自氧化和喹化。EPS饲养的粉虫存活率高于饥饿虫，表明EPS是营养来源。然而,在仅饲喂EPS的粉虫中没有观察到体重增加。与麸皮或聚氨酯泡沫（PU）混合饮食的比较表明，蛋白质，EPS中不存在的磷和镁成分是粉虫生长所必需的。
