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论文题目: Impact of amylose content on starch physicochemical properties in transgenic sweet potato
英文论文题目: Impact of amylose content on starch physicochemical properties in transgenic sweet potato
第一作者: Zhou, WZ; Yang, J; Hong, Y; Liu, GL; Zheng, JL; Gu, ZB; Zhang, P
英文第一作者: Zhou, WZ; Yang, J; Hong, Y; Liu, GL; Zheng, JL; Gu, ZB; Zhang, P
联系作者: Zhang, P (reprint author), Chinese Acad Sci, Shanghai Inst Biol Sci, Inst Plant Physiol & Ecol, 300 Fenglin Rd, Shanghai 200032, Peoples R China.
英文联系作者: Zhang, P (reprint author), Chinese Acad Sci, Shanghai Inst Biol Sci, Inst Plant Physiol & Ecol, 300 Fenglin Rd, Shanghai 200032, Peoples R China.
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发表年度: 2015
卷: 122
期:
页码: 417-427
摘要: The intrinsic relationship between amylose content and starch physicochemical properties was studied using six representative starch samples (amylose content 0-65%) produced from transgenic sweet potato (cultivar Xushu22). The transgenic lines (waxy and high-amylose) and wild-type (WT) sweet potatoes were analyzed for amylose content, particle size and chain length distribution, X-ray diffraction analysis, thermal characteristics, pasting and theological property. Compared to the WT starch, the waxy and high-amylose starches showed larger average granule sizes and had fewer short chains and more medium and long chains. X-ray diffractogram analysis revealed that high-amylose starches show a type-B crystal form with a markedly decreased degree of crystallinity in contrast to the type-A crystal form of the WT and waxy starches. In the high-amylose sweet potato starches, the rise of setback value and the reduction of breakdown value led to the high shear resistance as indicated by the higher G', G '', and tan delta from the oscillation test. Delta H was not found to be decreased with the reduction of crystallinity. The shear stress resistance of starch gel after gelatinization was also enhanced as amylose content increased. Principal component analysis also confirmed that the amylose content greatly influenced the starch structure and properties, e.g., storage modulus, setback value, and average chain length. Thus, our study not only shed light on how amylose content affects starch properties but also identified novel starches that are available for various applications. (C) 2014 Elsevier Ltd. All rights reserved.
英文摘要: The intrinsic relationship between amylose content and starch physicochemical properties was studied using six representative starch samples (amylose content 0-65%) produced from transgenic sweet potato (cultivar Xushu22). The transgenic lines (waxy and high-amylose) and wild-type (WT) sweet potatoes were analyzed for amylose content, particle size and chain length distribution, X-ray diffraction analysis, thermal characteristics, pasting and theological property. Compared to the WT starch, the waxy and high-amylose starches showed larger average granule sizes and had fewer short chains and more medium and long chains. X-ray diffractogram analysis revealed that high-amylose starches show a type-B crystal form with a markedly decreased degree of crystallinity in contrast to the type-A crystal form of the WT and waxy starches. In the high-amylose sweet potato starches, the rise of setback value and the reduction of breakdown value led to the high shear resistance as indicated by the higher G', G '', and tan delta from the oscillation test. Delta H was not found to be decreased with the reduction of crystallinity. The shear stress resistance of starch gel after gelatinization was also enhanced as amylose content increased. Principal component analysis also confirmed that the amylose content greatly influenced the starch structure and properties, e.g., storage modulus, setback value, and average chain length. Thus, our study not only shed light on how amylose content affects starch properties but also identified novel starches that are available for various applications. (C) 2014 Elsevier Ltd. All rights reserved.
刊物名称: CARBOHYDRATE POLYMERS
英文刊物名称: CARBOHYDRATE POLYMERS
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学科: Chemistry; Polymer Science
英文学科: Chemistry; Polymer Science
影响因子: 4.074
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论文类别: Article
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2014 中国科学院上海生命科学研究院 版权所有