In order to investigate whether an air–water plasma jet is beneficial to improve the efficiency of inactivation, a series of experiments were done using a ring-needle plasma jet. The water content in the working gas...In order to investigate whether an air–water plasma jet is beneficial to improve the efficiency of inactivation, a series of experiments were done using a ring-needle plasma jet. The water content in the working gas（air） was accurately measured based on the Karl Fischer method. The effects of water on the production of OH（A;Σ;–X;Π;） and O（3p;P–3s;S） were also studied by optical emission spectroscopy. The results show that the water content is in the range of 2.53–9.58 mg l;, depending on the gas/water mixture ratio. The production of OH（A;Σ;–X;Π;） rises with the increase of water content, whereas the O（3p;P–3s;S） shows a declining tendency with higher water content. The sterilization experiments indicate that this air–water plasma jet inactivates the P. digitatum spores very effectively and its efficiency rises with the increase of the water content. It is possible that OH（A;Σ;–X;Π;） is a more effective species in inactivation than O（3p;P–3s;S） and the water content benefit the spore germination inhibition through rising the OH（A;Σ;–X;Π;） production. The maximum of the inactivation efficacy is up to 93% when the applied voltage is -6.75 kV and the water content is 9.58 mg l;.展开更多
探讨并优化了测定苯酚-硫酸法灵芝(Ganoderma lucidum)孢子粉多糖含量的检测条件,通过单因素和正交试验方法确定灵芝孢子粉多糖的最佳检测条件,并分析不同检测方法测定灵芝孢子粉多糖含量的差异。结果表明,灵芝孢子粉多糖苯酚-硫酸法的...探讨并优化了测定苯酚-硫酸法灵芝(Ganoderma lucidum)孢子粉多糖含量的检测条件,通过单因素和正交试验方法确定灵芝孢子粉多糖的最佳检测条件,并分析不同检测方法测定灵芝孢子粉多糖含量的差异。结果表明,灵芝孢子粉多糖苯酚-硫酸法的最佳测定条件为最大吸收波长489 nm,5%苯酚用量0.5 m L,浓硫酸用量2.5 m L,提取温度90℃,提取时间3.0 h,料液比(g·m L^(-1))为1:40,在此条件下平均回收率为99.54%,相对标准偏差(RSD)为0.90%。本试验优化后的检测方法具有良好的稳定性及重复性,回收率高,并能有效减少检测试剂苯酚和浓硫酸的使用量,具有实际应用意义。展开更多
基金supported by National Natural Science Foundation of China (NSFC) under Grants No. 51407020National Key Technology Research and Development Program of the Ministry of Science and Technology of China under Grants No. 2014BAC13B05Visiting Scholarship of State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University) No. 2007DA10512716404
文摘In order to investigate whether an air–water plasma jet is beneficial to improve the efficiency of inactivation, a series of experiments were done using a ring-needle plasma jet. The water content in the working gas（air） was accurately measured based on the Karl Fischer method. The effects of water on the production of OH（A;Σ;–X;Π;） and O（3p;P–3s;S） were also studied by optical emission spectroscopy. The results show that the water content is in the range of 2.53–9.58 mg l;, depending on the gas/water mixture ratio. The production of OH（A;Σ;–X;Π;） rises with the increase of water content, whereas the O（3p;P–3s;S） shows a declining tendency with higher water content. The sterilization experiments indicate that this air–water plasma jet inactivates the P. digitatum spores very effectively and its efficiency rises with the increase of the water content. It is possible that OH（A;Σ;–X;Π;） is a more effective species in inactivation than O（3p;P–3s;S） and the water content benefit the spore germination inhibition through rising the OH（A;Σ;–X;Π;） production. The maximum of the inactivation efficacy is up to 93% when the applied voltage is -6.75 kV and the water content is 9.58 mg l;.
文摘探讨并优化了测定苯酚-硫酸法灵芝(Ganoderma lucidum)孢子粉多糖含量的检测条件,通过单因素和正交试验方法确定灵芝孢子粉多糖的最佳检测条件,并分析不同检测方法测定灵芝孢子粉多糖含量的差异。结果表明,灵芝孢子粉多糖苯酚-硫酸法的最佳测定条件为最大吸收波长489 nm,5%苯酚用量0.5 m L,浓硫酸用量2.5 m L,提取温度90℃,提取时间3.0 h,料液比(g·m L^(-1))为1:40,在此条件下平均回收率为99.54%,相对标准偏差(RSD)为0.90%。本试验优化后的检测方法具有良好的稳定性及重复性,回收率高,并能有效减少检测试剂苯酚和浓硫酸的使用量,具有实际应用意义。
