串联银离子色谱柱分析结构甘油三酯同分异构体的研究

利用串联银离子液相色谱柱对结构甘油三酯的同分异构体进行分离测定。研究紫外检测器和蒸发光散射检测器对甘油三酯同分异构体响应的影响,建立了结构甘油三酯同分异构体的定量测定方法。试验证明此法可有效分离甘油三酯的同分异构体,并能准确定量,为结构脂质的开发和性能评价提供了参考依据。

银离子色谱柱用于食用油成分分析的研究

本文利用自制的银离子柱分离,采用高效液相色谱法进行食用油成分分析,探讨进样量、同种油不同厂家、不同种类的植物油、不同种类的动物油的分离效果,并对银柱的重现性进行了实验。

婴幼儿配方奶粉中1,3-二油酸-2-棕榈酸甘油三酯的定量测定方法

建立了HPLC法定量测定婴幼儿配方奶粉中1,3-二油酸-2-棕榈酸甘油三酯的方法。采用银离子色谱柱正相色谱进行分离,以二氯甲烷、丙酮为流动相,进行梯度洗脱。在优化条件下,1,3-二油酸-2-棕榈酸甘油三酯在12.5~400.0μg/m L范围内线性关系良好(r>0.999)。方法的低、中、高三个水平的加标回收率在91.1%~105.1%之间,相对标准偏差在3.6%~4.5%,检出限(S/N=3)为2mg/100g。方法的日内精密度为3.6%,日间精密度为6.7%。该方法操作简便、灵敏度高、重复性好,可用于婴幼儿配方奶粉中的1,3-二油酸-2-棕榈酸甘油三酯的定量测定。

A resonator mode in linear arrays of silver spheres and cylinders

A transversal mode with zero group velocity and non-zero phase velocity that can exist in chains of silver nano- spheres in the optical frequency range was theoretically studied. It is shown that the external source radiating a narrow-band non-monochromatic signal can excite in the chain a mixture of standing and slowly travelling waves. The standing wave com- ponent (named as resonator mode) is strongly dominating. The physical reason of such a regime is a sign-varying distribution of power flux over the cross section of the chain. This situation is similar to the scenario of the propagation of a wave along the boundary between the right-handed and left-handed media where the spatial distribution of the light intensity is vortex. However, in the present case there is no boundary between media and the boundary between the positive and negative power fluxes is a cylindric tube in free space whose axis is the axis of the chain.