排序方式: 共有19条查询结果,搜索用时 15 毫秒
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目的建立黄颡鱼中孔雀石绿、隐色孔雀石绿、结晶紫、隐色结晶紫、亚甲基蓝、天青A、天青B残留量检测的QuEChERS-高效液相色谱-串联质谱(high performanc eliquid chromatography-tandem mass spectrometry, HPLC-MS/MS)联用方法。方法样品中加入乙腈于-18℃冷冻30 min,再加入去水剂无水硫酸镁和氯化钠,漩涡振荡离心后取上清液加入净化萃取试剂,漩涡离心后氮气吹至近干,乙腈复溶并注入HPLC-MS/MS测试。结果在最优的条件下, 7种染料类兽药在0.1~10 ng/mL范围内线性关系良好,方法平均回收率为78.2%~95.3%,精密度为3.0%~5.6%。结论该方法简单、快速、可靠,线性关系良好,检出限低,灵敏度高,可用于黄颡鱼中7种染料类兽药残留测定。 相似文献
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The quality of experience (QoE) evaluation model for voice over IP (VoIP) service is studied to analyze the impact of network parameters on voice quality and monitor voice quality in real-time for operators. Firstly, the influence of some network parameters on the voice quality of VoIP is investigated. Then, a simulation platform for VoIP transmission is built to collect voice data under different network enviornments. According to the simulation results, a new mapping model between these arguments and VoIP voice quality is deduced. Finally, the accuracy of this voice quality evaluation model is examined and the results demanstrate that it has high reliability and feasibility. 相似文献
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响应面法优化副干酪乳杆菌HD1.7产Paracin1.7发酵培养基 总被引:1,自引:0,他引:1
目的:优化副干酪乳杆菌(Lactobacillus paracasei)HD1.7发酵产抗菌肤Paracin 1.7培养基.方法:采用Plackett-Burman设计,从8个因素中筛选显著的影响因素,然后通过最陡爬坡和Box-Behnken设计进行优化,并用JMP 7.01软件分析.结果:用Plackett-Burman设计筛选出影响显著的3个因素——葡萄糖、MgSO4、MnSO4,其最佳质量浓度分别为6.5685、0.454、0.01052 g/L.在优化后的培养基下,抗菌肤效价达141.648 IU/mL,产量比优化前(74.13 IU/mL)提高了1.91倍.结论:副干酪乳杆菌HD1.7产生的抗菌肽Paracin1.7对多种革兰氏阳性细菌、革兰氏阴性细菌及酵母菌都有抑制作用,可作为新型食品防腐剂.本研究结果为抗菌肤Paracin1.7的工业化生产奠定了基础. 相似文献
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