Department of Biotechnology and Food Technology, Durban University of Technology, Durban, South Africa.
Agricultural Research Council, Roodeplaat -Vegetable and Ornamental Plant Institute, Pretoria, South Africa.
Carbohydr Polym. 2015 Nov 20;133:171-8. doi: 10.1016/j.carbpol.2015.06.100. Epub 2015 Jul 10.
The physicochemical properties of starches extracted from five bambara genotypes were investigated. Bambara starch granules were predominantly oval shaped with a smooth surface and an average size of 26±0.2μm. The amylose contents (20-35%) varied significantly among genotypes. X-ray diffraction revealed the C-type pattern for all starches with relative crystallinity range: 29-35%. FTIR spectra of bambara starches showed variable peak intensities at 2931, 1655 and 860cm(-1), which corresponds to CH stretching, H2O bending vibrations and CO stretching, respectively. Bambara genotype with the highest amylose content showed the lowest intensity at wavenumber 2931cm(-1). With the exception of oil absorption which was similar, swelling power, water absorption and paste clarity of starches were significantly different among genotypes. Genotype with high amylose content showed restricted swelling, low paste clarity and great ability to absorb water. All bambara starches displayed a shear thinning behaviour (n<1).
研究了五种兵豆基因型提取的淀粉的物理化学性质。兵豆淀粉颗粒主要呈椭圆形，表面光滑，平均粒径为 26±0.2μm。直链淀粉含量（20-35%）在基因型间有显著差异。X 射线衍射显示所有淀粉均呈现 C 型图谱，相对结晶度范围为 29-35%。兵豆淀粉的 FTIR 光谱在 2931、1655 和 860cm(-1)处显示出可变的峰强度，分别对应 CH 伸缩、H2O 弯曲振动和 CO 伸缩。直链淀粉含量最高的兵豆基因型在 2931cm(-1)处的强度最低。除了吸油率相似外，淀粉的膨胀力、吸水率和糊透明度在基因型间有显著差异。直链淀粉含量高的基因型表现出限制膨胀、低糊透明度和强吸水性。所有兵豆淀粉均表现出剪切变稀行为（n<1）。
