采用γ射线辐照降解壳聚糖,并利用凝胶渗透色谱和傅立叶红外对辐照所得产物进行分析。发现在100 kG y剂量时,就能有效降解壳聚糖,所得产物的分子量约为原来的四分之一。在50 kG y^300 kG y的剂量范围内,辐照对其结构和脱乙酰度几乎没有...采用γ射线辐照降解壳聚糖,并利用凝胶渗透色谱和傅立叶红外对辐照所得产物进行分析。发现在100 kG y剂量时,就能有效降解壳聚糖,所得产物的分子量约为原来的四分之一。在50 kG y^300 kG y的剂量范围内,辐照对其结构和脱乙酰度几乎没有影响。针对一种革兰氏阳性菌(金黄色葡萄球菌,S t.aereus)和三种革兰氏阴性菌(大肠杆菌,E.co li;弧菌,V.angu illarum;气单胞菌,A.hydroph ila),试验了辐射降解壳聚糖低聚物的抑菌性能。发现在实验的分子量范围内,壳聚糖低聚物对革兰氏细菌均有良好的抑制作用。在壳聚糖质量分数为3×10-4时,抑菌率大于90%。展开更多
In this study atmospheric pressure dielectric barrier discharge （DBD） plasma has been employed for sterilizing dry turmeric powders. A 6 kV, 6 kHz frequency generator was used to generate plasma with Ar, Ar/Ou, He, ...In this study atmospheric pressure dielectric barrier discharge （DBD） plasma has been employed for sterilizing dry turmeric powders. A 6 kV, 6 kHz frequency generator was used to generate plasma with Ar, Ar/Ou, He, and He/O2 gases between the 5 mm gap of two quartz covered electrodes. The complete sterilization time of samples due to plasma treatment was measured. The most important contaminant of turmeric is bacillus subtilis. The results show that the shortest sterilization time of 15 rain is achieved by exposing the samples to Ar/O2 plasma. Survival curves of samples are exponential functions of time and the addition of oxygen to plasma leads to a significant increase of the absolute value of time constant of the curves. Magnitudes of protein and DNA in treated samples were increased to a similar value for all samples. Taste, color, and solubility of samples were not changed after the plasma treatment.展开更多
文摘采用γ射线辐照降解壳聚糖,并利用凝胶渗透色谱和傅立叶红外对辐照所得产物进行分析。发现在100 kG y剂量时,就能有效降解壳聚糖,所得产物的分子量约为原来的四分之一。在50 kG y^300 kG y的剂量范围内,辐照对其结构和脱乙酰度几乎没有影响。针对一种革兰氏阳性菌(金黄色葡萄球菌,S t.aereus)和三种革兰氏阴性菌(大肠杆菌,E.co li;弧菌,V.angu illarum;气单胞菌,A.hydroph ila),试验了辐射降解壳聚糖低聚物的抑菌性能。发现在实验的分子量范围内,壳聚糖低聚物对革兰氏细菌均有良好的抑制作用。在壳聚糖质量分数为3×10-4时,抑菌率大于90%。
文摘In this study atmospheric pressure dielectric barrier discharge （DBD） plasma has been employed for sterilizing dry turmeric powders. A 6 kV, 6 kHz frequency generator was used to generate plasma with Ar, Ar/Ou, He, and He/O2 gases between the 5 mm gap of two quartz covered electrodes. The complete sterilization time of samples due to plasma treatment was measured. The most important contaminant of turmeric is bacillus subtilis. The results show that the shortest sterilization time of 15 rain is achieved by exposing the samples to Ar/O2 plasma. Survival curves of samples are exponential functions of time and the addition of oxygen to plasma leads to a significant increase of the absolute value of time constant of the curves. Magnitudes of protein and DNA in treated samples were increased to a similar value for all samples. Taste, color, and solubility of samples were not changed after the plasma treatment.
