By means of microscope, X rays diffraction, electron probe, scan electron microscope and differential thermal analysis, the mineral component and quantity of industrial powder and experiment powder as well as the infl...By means of microscope, X rays diffraction, electron probe, scan electron microscope and differential thermal analysis, the mineral component and quantity of industrial powder and experiment powder as well as the influence of mineral component on physicochemical quality ( T m, T c, η ,crystal ratio et al .) have been studied in this paper.展开更多
文摘将玉米置于1.5 m×0.95 m×1.2 m的模拟仓中,于室温(25~35℃)下储藏,定期观察玉米色泽、气味和发霉情况,并测定脂肪酸值、容重、不完善粒和糊化特性等品质指标。结果表明:水分含量为14%的玉米储藏60 d后,仍呈现玉米固有的色泽、气味和亮度,脂肪酸值略有上升,但在宜存范围;容重由755 g/L降至735 g/L,不完善粒上、中、下层均增多;最终黏度和峰值黏度略有下降,糊化温度基本稳定。最终黏度降低了300 m Pa·s,峰值黏度降低了44 m Pa·s,回生值下降260 m Pa·s,糊化温度在82~84℃之间波动。水分含量为17%的玉米储藏12 d后,上、中层不完善粒多于下层;52 d后,颜色变暗,上层和中层玉米籽粒开始发霉;储藏60 d脂肪酸值已升至90 mg/100 g;容重上层和中层下降幅度基本一致,由715 g/L降至665 g/L,而下层容重下降较少,下降了30 g/L;最终黏度降低480 m Pa·s,峰值黏度基本稳定,回生值降低100 m Pa·s,糊化温度均在(84±2)℃范围内波动。
文摘By means of microscope, X rays diffraction, electron probe, scan electron microscope and differential thermal analysis, the mineral component and quantity of industrial powder and experiment powder as well as the influence of mineral component on physicochemical quality ( T m, T c, η ,crystal ratio et al .) have been studied in this paper.
