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首页> 外文期刊>Journal of Polymers and the Environment >Biodegradability of Urea-Aldehyde Condensation Products
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Biodegradability of Urea-Aldehyde Condensation Products

机译：脲醛缩合产物的生物降解性

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Condensation products of urea and different aldehydes (formaldehyde, isobutyruldehyde, croton-aldehyde) are used in large amounts (more than 300,000 tons per year) as resins, binders, and insulating materials for industrial applications, as well as in controlled-release nitrogen fertilizer for greens, lawns, or bioremediation processes. The biodegradability of these condensates and the cn-zymic mechanism of their degradation was studied in mircoorganisms isolated from soil, which were able to use these compounds as the sole source of nitrogen for growth. Different pure cultures of both gram-positive and gram-negative bacteria completely degraded methylenediurea, dimeth-ylenetriurea, isobutylidenediurea, and crotonylidenediurea to urea, ammonia, and the corresponding aldehydes and carbon dioxide. Enzymes initiating this degradation were purified and characterized and turned out to be different with regard to their regulation of expression, their physicobiochem-ical properties, and their reaction mechanism.
机译：尿素和不同醛（甲醛，异丁醛，巴豆醛）的缩合产物大量（每年超过30万吨）用作工业应用的树脂，粘合剂和绝缘材料，以及控释氮肥用于果岭，草坪或生物修复过程。在从土壤中分离出的微生物中，研究了这些冷凝物的生物可降解性及其降解的cn-酶学机制，这些微生物能够将这些化合物用作生长的唯一氮源。革兰氏阳性和革兰氏阴性细菌的不同纯培养物将亚甲基二脲，二甲基亚乙基三脲，异丁烯二脲和巴豆酰二烯尿素完全降解为尿素，氨水以及相应的醛和二氧化碳。纯化和表征引发这种降解的酶，并对其表达调控，理化性质和反应机理进行了区分。

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