天然和γ辐照野生慈姑（箭叶慈姑）块茎淀粉的物理化学性质。
Physicochemical properties of native and γ-irradiated wild arrowhead (Sagittaria sagittifolia L.) tuber starch.
机构信息
Department of Food Science & Technology, University of Kashmir, Srinagar 190006, India.
Department of Food Science & Technology, University of Kashmir, Srinagar 190006, India.
出版信息
Int J Biol Macromol. 2015;77:360-8. doi: 10.1016/j.ijbiomac.2015.03.012. Epub 2015 Mar 20.
Starch isolated from wild arrowhead tuber was treated by γ-irradiation at 0, 5, 10 and 15kGy doses. Arrowhead tubers yielded 40.33% starch and its chemical composition revealed moisture, protein, ash and fat were 8.34±0.09%, 0.26±0.04%, 0.58±0.02% and 0%, respectively. Physicochemical, morphological and pasting properties of native and irradiated tuber starches were investigated. The results showed that peak, trough, final, and setback viscosities were significantly (p≤0.05) reduced, whereas the breakdown viscosity increased following irradiation. Physicochemical properties differed significantly and showed strong dose dependent relationship. Solubility, water absorption capacity and transmittance increased, whereas swelling power, bulk density and syneresis decreased upon increase in irradiation of starch. Correlation studies showed that irradiation dose was positively correlated with water absorption capacity and solubility index while it correlated negatively with pasting properties, swelling index, syneresis, and freeze thaw stability.
从野生慈姑块茎中分离得到的淀粉经 0、5、10 和 15kGy 剂量的γ射线处理。慈姑块茎产率为 40.33%，其化学成分表明水分、蛋白质、灰分和脂肪分别为 8.34±0.09%、0.26±0.04%、0.58±0.02%和 0%。研究了天然和辐照块茎淀粉的物理化学、形态和糊化特性。结果表明，峰值、低谷、最终和回生粘度显著降低（p≤0.05），而破坏粘度随辐照增加而增加。物理化学性质差异显著，表现出强烈的剂量依赖性。随着淀粉辐照剂量的增加，溶解度、吸水性和透光率增加，而膨胀力、堆积密度和离浆率降低。相关研究表明，辐照剂量与吸水性和溶解度指数呈正相关，与糊化特性、膨胀指数、离浆率和冻融稳定性呈负相关。
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