DNA degradation of genetically modified cottonseed meal during feed processing

文献类型： 外文期刊

第一作者： Guan, Qingfeng

作者： Guan, Qingfeng;Wang, Xiumin;Teng, Da;Yang, Yalin;Wang, Jianhua;Guan, Qingfeng;Wang, Xiumin;Teng, Da;Yang, Yalin;Wang, Jianhua

作者机构：

关键词： Cottonseed meal;Degradation;DNA;Extrusion;Feed processing

期刊名称：APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY （ 影响因子：2.926； 五年影响因子：2.685 ）

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年卷期：

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收录情况： SCI

摘要： The effects of dry heating, wet heating, and extrusion on the degradation of DNA in cottonseed meal (CSM) were studied using polymerase chain reaction (PCR) and real-time PCR approach. Both the sad1 DNA, ranging between 128 and 883 bp in size, and the cry1Ab/c gene, ranging between 183 and 652 bp in size, were detectable in all dry-heated CSM and cottonseed. During wet heating, the sad1 gene (≥883 bp) and the cry1Ab/c (≥952 bp) gene were thoroughly degraded at 105 and 120 C, respectively. Sizes from 128 to 530 bp for the sad1 gene and sizes from 183 to 652 bp for the cry1Ab/c gene were detected during extrusion at temperatures ranging from 75 to 135 C. Fragments ≤883 bp for the sad1 gene and ≤952 bp for the cry1Ab/c gene were detected in all of the extruded samples with water content varying between 26 and 34 %. The copy number ratio of cry1Ab/c to sad1 in samples of Bt cottonseed meal decreased rapidly when the temperature increased during the heating process. In conclusion, feed processing markedly degrades the larger DNA fragments of sad1 and cry1Ab/c, with high temperature and water content being the main factors for that degradation.

分类号： Q5

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