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首页> 外文期刊>Journal of Polymers and the Environment >Biodegradation of Coproducts from Industrially Processed Corn in a Compost Environment
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Biodegradation of Coproducts from Industrially Processed Corn in a Compost Environment

机译：堆肥环境中工业加工玉米副产物的生物降解

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摘要

Information pertaining to biodegradability of renewable polymeric material is critical for the design and development of single-use biodegradable consumer products. The rate and extent of biodegrada-tion of corn fiber, corn zein, cornstarch, distillers grain, and corn gluten meal were evaluated in compost environments under variable temperature, pH, and moisture conditions. Generally, composts with higher temperature (40℃), neutral pH (7.0), and 50%-60% moisture appeared to be ideal for corn coproduct biodegradation, particularly for corn gluten meal and corn zein. Low moisture conditions slowed biodegradation considerably, but degradation rates improved when moisture content increased up to 60%. Thereafter, increased moisture particularly slowed the degradation of corn gluten meal and corn zein, whereas cornstarch degradation remained unaffected. At low pH (4.0) and high pH (11.0) the rate of degradation of most coproducts was slowed somewhat. Cornstarch degradation was slower at pH 7.0, but degradation improved with increased temperatures. Increase in compost temperature from 25 to 40℃ (in 5℃ increments) also improved biodegradation of corn fiber and distillers grain. Addition of 1% urea to compost as a nitrogen source decreased the extent of biodegradation nearly 40% for corn gluten meal and corn zein, and 20% for cornstarch samples. Treatment of compost with 0.02% azide inhibited biodegradation of ail coproducts, suggesting that the presence of metabolically active microbial cells is required for effective degradation of biobased materials in a compost environment.
机译：与可再生聚合物材料的生物降解性有关的信息对于一次性使用的生物可降解消费品的设计和开发至关重要。在可变温度，pH和湿度条件下的堆肥环境中，评估了玉米纤维，玉米玉米蛋白，玉米淀粉，酒糟和玉米面筋粉的生物降解速率和程度。通常，具有较高温度（40℃），中性pH（7.0）和50％-60％水分的堆肥似乎是玉米副产物生物降解的理想选择，尤其是玉米面筋粉和玉米醇溶蛋白。低水分条件极大地减缓了生物降解，但是当水分含量增加至60％时，降解率提高。此后，增加的水分特别减慢了玉米面筋粉和玉米蛋白的降解，而玉米淀粉的降解仍然不受影响。在低pH（4.0）和高pH（11.0）下，大多数副产物的降解速度有所降低。在pH 7.0时，玉米淀粉的降解速度较慢，但​​随着温度的升高，降解程度有所改善。堆肥温度从25℃增加到40℃（以5℃为增量）也改善了玉米纤维和酒糟的生物降解。向堆肥中添加1％的尿素作为氮源可将玉米面筋粉和玉米玉米蛋白的生物降解程度降低近40％，对于玉米淀粉样品降低20％。用0.02％叠氮化物处理堆肥会抑制所有副产物的生物降解，这表明在堆肥环境中有效降解生物基材料需要代谢活性微生物细胞的存在。

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