浙江农业学报

• 作物科学 • 上一篇    下一篇

糯玉米胚乳重组淀粉的糊化和流变学特性研究

  

  1. (1 青岛农业大学 农学与植物保护学院 山东省旱作农业技术重点实验室,山东 青岛 266109;2山东省小麦玉米周年高产高效生产协同创新中心,山东 泰安 271018)
  • 出版日期:2015-06-25 发布日期:2015-06-26

Pasting and rheological properties of the reconstituted starch from waxy corn endosperm

  1. (1 College of Agronomy and Plant Protection, Qingdao Agricultural University, Shandong Key Laboratory of Dry Farming Technique, Qingdao 266109, China; 2 Cooperative Innovation Center of Efficient Production with High Annual Yield of Wheat and Corn, Taian 271018, China)
  • Online:2015-06-25 Published:2015-06-26

摘要: 以7个糯玉米品种为材料,分离它们的胚乳大、小淀粉粒,以不同质量比的大、小淀粉粒配比组成重组淀粉,分析重组淀粉的糊化和流变学特性。结果表明,5个重组淀粉处理条件下7个糯玉米品种的峰值黏度、崩解值和稠度系数均表现为3∶0>2∶1>1∶1>1∶2>0∶3,而流变指数表现为3∶0<2∶1<1∶1<1∶2<0∶3,谷值黏度、终值黏度、回复值、峰值时间和糊化温度在不同品种间有所不同。不同配比重组淀粉的大淀粉粒比例与峰值黏度(R2=0.96~0.99)、崩解值(R2=0.92~0.99)和稠度系数(R2=0.89~0.98)均呈(极)显著正相关,与流变指数呈(极)显著负相关(R2=-0.93 ~-1.00);小淀粉粒所占比例恰好相反。说明,重组淀粉的大淀粉粒比例越高,峰值黏度和崩解值越高,淀粉糊的稠度系数越大,流变指数越小。

关键词: 糯玉米, 重组淀粉, 糊化特性, 流变学特性

Abstract: Seven varieties of waxy corn were used to isolate large and small starch granules and constitute the reconstituted starch according to different weight ratio. Pasting and rheological properties of the reconstituted starch were analyzed by dint of Rapid Viso\|Analyzer and rheometer, respectively. The results indicated that peak viscosity, breakdown and consistency coefficient of seven waxy corns in five reconstituted starch treatments exhibited as 3∶0>2∶1>1∶1>1∶2>0∶3, and flow rheological index represented as 3∶0<2∶1<1∶1<1∶2<0∶3. Trough viscosity, final viscosity, setback value, peak time and pasting temperature in the reconstituted starch were different among seven varieties. Correlation analysis showed the percentage of large starch granule in the reconstituted starch was significantly positively correlated with peak viscosity (R2=0.96-0.99), breakdown (R2=0.92-0.99) and consistency coefficient (R2=0.89-0.98), while significantly negatively correlated with flow behavior index (R2=-0.93-1.00). The relations of the percentage of small starch granule and these properties were contrary. Therefore, the higher percentage of large starch granule in the reconstituted starch was, the bigger peak viscosity, breakdown and consistency coefficient were, and the smaller flow behavior index was.

Key words: waxy corn, reconstituted starch, pasting property, rheological property