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Chen S.,East China Institute of Technology | Liu Z.,East China Institute of Technology | Zeng K.,East China Institute of Technology | Zeng K.,Nanchang Food Quality Health Safety Supervision and Inspection Center
Chinese Journal of Environmental Engineering | Year: 2016

The rice straw was studied in order to illuminate the influence of straw-decomposing inoculant on the decomposition of rice straw. The influences of different pH, urea and straw-decomposing inoculant contents, times, temperatures and water ratios on the decomposition of rice straw were investigated with decomposition rate (C/N) of the rice straw as index. Before and after decomposition, rice straw was characterized by IR. Experimental results showed that straw-decomposing inoculant can greatly improve the decomposition rate of rice straw. The decomposition rate of rice straw began to be stable after 25 days. The feasible pH is 7.Both of urea and straw-decomposing inoculant content account for 1% of the quality of rice straw. The water ratio is 80% and temperature is 30℃. Under such conditions, the decomposition rate can reach 40.73%. According to the result of IR, the cellulose, lignin and hemicellulose in the decomposed rice straw were exploded and they caused the decrease of the hydroxyl and methylene groups. It also showed that phenolic compounds were oxidized into quinones materials. In addition, the protein and a mino acid were decomposed into acetanilide-group compound, nitrate and ammonium salts. © 2016, Science Press. All right reserved. Source


Zeng K.,Nanchang Food Quality Health Safety Supervision and Inspection Center | Liu Z.,East China Institute of Technology | Ning Y.,Nanchang Food Quality Health Safety Supervision and Inspection Center | Li J.,Nanchang Food Quality Health Safety Supervision and Inspection Center | And 2 more authors.
Chinese Journal of Chromatography (Se Pu) | Year: 2013

A method established for determining melamine and creatinine in milk and milk products. The samples were extracted with 1% trichloracetic acid solution. The extract was cleaned-up by using a mixed-mode cation ion exchange SPE column and evaporated to dryness under nitrogen. The residue was derived by bis(trimethylsilyl)trifluoroacetamide-chlorotrimeth-ylsilane (BSTFA-TMCS), then determined by gas chromatography-mass spectrometry (GC-MS) in selected ion monitoring (SIM) mode. Melamine and creatinine had good linearity in the range of 0. 1 - 50 mg/L with the correlation coefficients higher than 0. 99, and the limits of quantification were 0. 10 mg/kg and 0. 20 μg/kg, respectively. The recoveries of melamine and creatinine were 80. 7% - 116. 8% and 77. 6% - 107. 5% with RSD no more than 9. 4% and 8. 5% in the spiked range of 10 -100 mg/kg and 0. 1 -5. 0 μg/kg, respectively. The method is accurate, sensitive, and suitable for the determination of creatinine in milk and milk products. Source


Zeng K.,Nanchang Food Quality Health Safety Supervision and Inspection Center | Liu Z.,Nanchang Food Quality Health Safety Supervision and Inspection Center | Ning Y.,Nanchang Food Quality Health Safety Supervision and Inspection Center | Li J.,Nanchang Food Quality Health Safety Supervision and Inspection Center | And 2 more authors.
Se pu = Chinese journal of chromatography / Zhongguo hua xue hui | Year: 2013

A method established for determining melamine and creatinine in milk and milk products. The samples were extracted with 1% trichloracetic acid solution. The extract was cleaned-up by using a mixed-mode cation ion exchange SPE column and evaporated to dryness under nitrogen. The residue was derived by bis (trimethylsilyl) trifluoroacetamide-chlorotrimethylsilane (BSTFA-TMCS), then determined by gas chromatography-mass spectrometry (GC-MS) in selected ion monitoring (SIM) mode. Melamine and creatinine had good linearity in the range of 0.1 - 50 mg/L with the correlation coefficients higher than 0.99, and the limits of quantification were 0.10 mg/kg and 0.20 mg/kg, respectively. The recoveries of melamine and creatinine were 80.7% - 116.8% and 77.6% - 107.5% with RSD no more than 9.4% and 8.5% in the spiked range of 10 - 100 mg/kg and 0.1 - 5.0 mg/kg, respectively. The method is accurate, sensitive, and suitable for the determination of creatinine in milk and milk products. Source

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