Evaluation of the biodegradation of starch and cellulose under controlled composting conditions
Evaluation of the biodegradation of starch and cellulose under controlled composting conditions
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DOI：
10.1023/a:1021825715232
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发表时间：
1998-10-01
期刊：
影响因子：
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通讯作者：
Bastioli, C
中科院分区：
文献类型：
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作者：
Degli-Innocenti, F;Tosin, M;Bastioli, C
为了验证受控堆肥试验方法(即ISO/DIS 14855：1997、ASTMD5338-92或CEN对应标准)对不同浓度的淀粉的响应，测试了试验方法规定的最大量(100g)和较低的量(60和30g)，就好像淀粉是混合物中的辅助成分一样。培养44天后(58℃恒温)，生物降解曲线处于平台期，最终结果如下(标称淀粉初始量为100g)：淀粉100g，97.5%；淀粉60g，63.7%；淀粉30g，32.5%。数据显示，在每种情况下，二氧化碳的释放大致等于理论上的最大值，这表明淀粉完全矿化。我们无法辨别在较低浓度下发现的偏差是否是由启动效应引起的。无论如何，偏差的程度并不高，在生物降解研究中是可以接受的。收集4个独立的实验，得到11条生物降解曲线，47+/-1天的平均降解率为96.8+/-6.7%(SD)。数据表明，控制堆肥也是一种可靠的测试方法，对淀粉和纤维素，因此，对淀粉和纤维素材料。
In order to verify the response of the controlled composting test method (i.e., the ISO/DIS 14855:1997, the ASTM D 5338-92, or the CEN counterpart) to starch at different concentrations, the maximum amount prescribed by the test method (100 g) and lower amounts (60 and 30 g), as if starch were a coingredient in a blend, were tested. After 44 days of incubation (at a constant temperature of 58 degrees C) the biodegradation curves were in a plateau phase, displaying the following final values (referred to a nominal starch initial amount of 100 g): starch 100 g, 97.5%; starch 60 g, 63.7%; and starch 30 g, 32.5%. The data show a CO2 evolution roughly equal, in each case, to the theoretical maximum, indicating a complete starch mineralization. We cannot discern whether the deviations found at lower concentrations are caused by a priming effect. In any case, the extent of the deviations is not high and is acceptable in biodegradation studies. The average biodegradation of cellulose, obtained gathering four independent experiments with 11 biodegradation curves, turned out to be 96.8 +/- 6.7% (SD) after 47 +/- 1 days. The data indicate that the controlled composting is a reliable test method also for starch and cellulose and, consequently, for starch-based and cellulose-based materials.