Universidad Autónoma Metropolitana-Iztapalapa, Departamento de Biotecnología, Apartado Postal 55-534, México, D.F. 09340, Mexico.
Carbohydr Polym. 2013 Jun 5;95(1):207-13. doi: 10.1016/j.carbpol.2013.03.017. Epub 2013 Mar 13.
Plantain native starch was hydrolysed with sulphuric acid for twenty days. Hydrolysis kinetics was described by a logistic function, with a zero-order rate during the first seven days, followed by a slower kinetics dynamics at longer times. X-ray diffraction results revealed a that gradual increase in crystallinity occurred during the first seven days, followed by a decrease to values similar to those found in the native starch. Differential scanning calorimetry analysis suggested a sharp structure transition by the seventh day probably due to a molecular rearrangement of the starch blocklets and inhomogeneous erosion of the amorphous regions and semi crystalline lamellae. Scanning electron micrographs showed that starch granules morphology was continually degraded from an initial oval-like shape to irregular shapes due to aggregation effects. Granule size distribution broadened as hydrolysis time proceeded probably due to fragmentation and agglomeration phenomena of the hydrolysed starch granules.
芭蕉芋原淀粉经硫酸水解 20 天。水解动力学可用 logistic 函数描述，前 7 天为零级反应，随后在较长时间内动力学速度较慢。X 射线衍射结果表明，在前 7 天结晶度逐渐增加，随后下降到与原淀粉相似的值。差示扫描量热法分析表明，第 7 天可能由于淀粉块的分子重排以及无定形区和半结晶层的不均匀侵蚀，结构发生急剧转变。扫描电子显微镜照片显示，由于聚集效应，淀粉颗粒形态从初始的椭圆形逐渐降解为不规则形状。随着水解时间的延长，颗粒大小分布变宽，可能是由于水解淀粉颗粒的碎片化和团聚现象所致。
