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Xu J.,Academy of State Administration of Grains | Xu J.,Beijing Technology and Business University | Wu S.,Academy of State Administration of Grains | Chang X.,Academy of State Administration of Grains | And 2 more authors.
Journal of the Chinese Cereals and Oils Association | Year: 2013

Fumonisins (Fumonisins, FB) are composed by Fusarium moniliforme, Fusarium verticillioides, Fusarium proliferatum and some other Fusarium secondary metabolites. Fumonisins are the water-solubility secondary metabolites produced by several sorts of bacteriums. The substance is widely presented in corn and other agricultural products. It can interfere with the normal physiology metabolic function of plants in the lower concentration range. Fumonisins can cause the decay of plants and crops that makes the economic losses. Moreover there is a serious carcinogenic harm to humans and animals. Fumonisins have gained considerable attention on food safety for their wide-scale occurring and high toxin. At present, the study on fumonisins has reached molecular levels. The gene cluster and coregulated genes associated with fumonisins biosynthesis were identified through genetics study on fumonisins producing strains of Fusarium verticillioides. This article describes the physical and chemical properties of fumonisins the mechanism of action and biosynthetic pathway. Furthermore, it also describes the fumonisins biosynthesis gene sequences group as well as the ways of gene clusters expression. This article discusses the method of fumonisins degradation, and presents the recommendations for the fumonisins bioengineering degradation studies in future.


Wang Y.,Shandong Jianzhu University | Wang Y.,Jinan Key Laboratory of Renewable Energy Utilization Technologies In Buildings | Thorpe G.R.,Victoria University of Melbourne | Zhao H.,Academy of State Administration of Grains | And 2 more authors.
Journal of the Chinese Cereals and Oils Association | Year: 2015

Grains should be stored free from insect pests. Insects that infest stored grains in all life stages may be killed by being fumigated with poisonous gases as phosphine. In the paper, a mathematical model for convective diffusion and sorption of fumigants to be used in stored grains has been developed to be implemented by Computational Fuid Dynamics (CFD). The model has been compared with published results and found to have excellent result. It is shown that the fumigation is non-uniform and the spatial distribution of fumigant can be affected by grain kernels' adsorption as well as the non-reversible chemical reaction. ©, 2015, Editorial Department, Chinese Cereals and Oils Association. All right reserved.


Li X.,Academy of State Administration of Grains
Journal of the Chinese Cereals and Oils Association | Year: 2013

The difficulty for measuring the equilibrium moisture content of grains is that the grains tend to go mouldy at water activities (aw) higher than or equal to 0.8. A generalization of the standard Guggenheim-Anderson-de Boer (GAB) equation was given on the basis of the assumption that the parameter of C of the GAB equation was not a constant, but the polynomial function of aw. So we came up with the generalized GAB equation EMBED Equation. 3, where we regarded n as degree of the polynomial as well as regarded a and bi (i=1, n) as polynomial coefficients. The advantage of this equation was to fit the sorption data for water activity from 0 to 1. The generalized GAB equation fitted well our measured equilibrium moisture sorption data of Chinese wheat and milled rice. The fitting data of GAB generalized equation could be used for sorption spectral analysis of Chinese grains.

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