Xiaofei Liu, J. Lian, Zhihui Zheng, Ye Qi, Guangjian Zhang, Wei Wang, Naipu Zhang
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引用次数: 0
Abstract
Corn straw is a type of high-yield agricultural waste in China, but it has not been fully utilized owing to the diffi culty of degrading it and its low utilization rate. To improve the rate of degradation of corn straw and ensure that the straw resources are utilized more fully, we obtained an actinomycete that could simultaneously degrade cellulose and pectin from the cold region and black glebe of northeast China. The strain was named DPA-3-18, and its biological morphology and the sequence of its 16S rRNA were identifi ed. These analyses determined that it is a species of Streptomyces. The strain was combined with the lab-stored GS-30 and Bacillus subtilis to construct composite fl ora and conduct a single factor experiment. Signifi cantly higher factors were selected by Plackett Burman, and its fermentation conditions were optimized using response surface methodology. The optimal cultivation conditions were 4% of inoculum, a culture temperature of 28.51°C, an initial pH value of the medium of 7.43, and the oscillation during fermentation took place at 199.62 rpm. Under these conditions, 40.38% of the corn straw was degraded. F rom the results of SEM, we found that the structure of corn straw before degradation was complete, and the internal structure of corn straw after degradation with c omposite fl ora was destructed. The FT-IR spectra shown that the absorption peaks in all places of corn straw were reduced after degradation by the composite fl ora, the absorption peaks at 1640 cm-1 of corn straw after degradation were lower than that of before degrad ation, which confi rmed the decrease in cellulose. It indicated that the corn straw was signifi cantly degraded by the composite fl ora. This study contributed to understanding the change in corn straw after fermentation by the composite fl ora, and providing a theoretical basis for comprehensive utilization of corn straw.
期刊介绍:
The Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science are welcomed except in areas such as agriculture, engineering and medical science which are outside the scope of the Journal. Currently, we focus on manuscripts in biology, chemistry, physics, materials science and environmental science. Papers in mathematics statistics and computer science are also included but should be of an applied nature rather than purely theoretical. Manuscripts describing experiments on humans or animals are required to provide proof that all experiments have been carried out according to the ethical regulations of the respective institutional and/or governmental authorities and this should be clearly stated in the manuscript itself. The Editor reserves the right to reject manuscripts that fail to do so.