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首页> 外文期刊>Journal of Applied Polymer Science >Biodegradation of Chemically Modified Gelatin Films in Lake and River Waters
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Biodegradation of Chemically Modified Gelatin Films in Lake and River Waters

机译：湖泊和河流水域中化学修饰的明胶薄膜的生物降解

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摘要

Gelatin was chemically modified by crosslinking samples with one of a number of bifunctional reagents as was done earlier in a processing technique used to improve mechanical properties through chain orientation. The effects of this crosslinking on the biodegradability of the resulting films were evaluated in the laboratory by exposing them to lake and river waters for 10 days with or without inoculation with periphyton organisms. Biodegradabilities were assessed by weight losses of the films and by measurements of dehydrogenase activity of biomasses taken from their surfaces. The extent of biodegradation depended on the type of crosslinking agent and the presence or absence of the periphyton. The gelatin films crosslinked with formaldehyde, glyoxal, or glutaraldehyde were the slowest to biodegrade; complete degradation required 8-10 days. In contrast, the most biodegradable was the gelatin crosslinked with hexamethylene diisocyanate, which required only 3-4 days. The uncrosslinked gelatin and the gelatin crosslinked with butadiene diepoxide and diepoxyoctane were intermediate, degrading in 5-7 days. The dehydrogenase activity paralleled the weight losses but rapidly decreased when the amount of gelatin remaining was small.
机译：明胶是通过将样品与多种双功能试剂之一交联进行化学修饰的，就像先前在通过链取向改善机械性能的加工技术中所做的那样。通过在有或没有接种周生植物的情况下将其在湖泊和河流水中暴露10天，在实验室中评估了这种交联对所得薄膜生物降解性的影响。通过膜的重量损失和通过测量从其表面获取的生物质的脱氢酶活性来评估生物降解性。生物降解的程度取决于交联剂的类型以及附生植物的存在与否。与甲醛，乙二醛或戊二醛交联的明胶薄膜生物降解速度最慢。完全降解需要8-10天。相反，最可生物降解的是与六亚甲基二异氰酸酯交联的明胶，仅需3-4天。未交联的明胶和与丁二烯二环氧化合物和二环氧辛烷交联的明胶是中间产物，在5-7天内降解。脱氢酶活性与重量减轻平行，但当明胶残留量少时，脱氢酶活性迅速降低。

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