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Wang H.,China Agricultural University | Liu X.,Agricultural Bureau Plant Protecting Station | Guo P.,Wuhan Institute of Technology | Guo P.,National Research and Development Center for Edible Fungi Processing | And 3 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2011

The degradation of rice straw without any chemical method pretreated by a lignocellulose degradation composite microbial system XDC-2 was studied. After 6 days cultivation, exocellular xylanase activity was 335 U/mL. After 12 days, the rice straw lost 39.71% of its weight, and the weight loss of hemicellulose and cellulose were 78.27% and 14.08% respectively. The total amount of the volatile products came to a maximum in the sixth day. Four major kinds of the volatile products were determined in fermentation broth, they were acetic acid, propionic acid, butanoic acid and glycerin, which could be utilized in industrial production. The composite microbial system XDC-2 became stable in degradation process of rice straw without any chemical method pretreated according to PCR-DGGE analysis. Accordingly, it has the potential for further development and application of composite microbial system XDC-2 due to its effective ability to degrade rice straw without any chemical pretreatment. Source


Shi D.,National Research and Development Center for Edible Fungi Processing | Shi D.,Wuhan Institute of Technology | Zhou M.,National Research and Development Center for Edible Fungi Processing | Zhou M.,Wuhan Institute of Technology | And 8 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

Air jet milling and wheel grinding were used to superfine pulverize lentinus edodes stem to improve added values. The operation parameters such as classifier rotating speed of air jet milling, host frequency and fan frequency of wheel grinding and feeding speed of two processes were analyzed and optimized using single factor test and piecewise linear fitting method. The pulverizing effect, processing time, production rate and energy consumption of two equipments were compared under respective optimized operation conditions. The results showed that the optimized rotating speed and feeding speed of air jet milling were 2400 r/min and 12 kg/h, respectively. The optimized host frequency, fan frequency and feeding speed of wheel grinding were 44Hz, 42 Hz and 5 kg/h, respectively. The superfine powder with particle median diameter (D 50) less than 10μm could be obtained by both superfine pulverizing methods. Compared with wheel grinding, air jet milling pulverized powder more precisely (with narrower particle size distribution) and spent less processing time (shortened by 56.43%), but obtained lower production rate and required higher energy consumption (4.77 times). On the whole, the wheel grinding method was more suitable for scale production of lentinus edodes stem. This research provides technical basis for the development and application of superfine pulverizing technology in lentinus edodes stem processing. Source

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