环糊精键合硅胶吸附性能的评价

初步探讨了第二代超分子环糊精键合硅胶(CDS)对酚类化合物的微量富集的性能,并讨论了CDS的富集机理.     

环糊精键合硅胶吸附性能的评价

初步探讨了第二代超分子环糊精键合硅胶（ＣＤＳ）对酚类化合物的微量富集的性能,并讨论了ＣＤＳ的富集机理。     

硅胶键合相的合成及其应用

主要介绍了硅胶健合相的3种主要合成方法、降低表面羟基技术以及硅胶键合相的应用研究进展。     

丙氧基—18—冠—6硅胶键合固定相的合成及色谱性能的研究

以多孔硅胶为基质,固相合成并制备了一种新型丙氧基-18-冠-6键合固定相(P18-C-6 SB),详细研究了其合成反应条件。P18-C-6 SB 是一种热稳定性好、耐溶剂,表面键合浓度高的色谱固定相。已应用于芳香族异构体及同系物的分离。     

大孔硅胶烷基键合固定相的制备

采用大孔硅胶和一氯硅烷制备了几种用于蛋白质分离的大孔硅胶短链烷基键合固定相。     

C18反相硅胶键合相的制备与性能评价

以20~40μm无定形硅胶为载体,与十八烷基三氯硅烷进行键合制备了C18反相硅胶键合相。热重差热分析表明所得键合相230℃以下热稳定性良好,对残留硅羟基的定量测定表明采用三甲基氯硅烷进行封端反应可消除3/4以上的残留硅羟基,柱层析试验表明该键合相具有良好的分离效果。     

用于蛋白质分离的大孔硅胶烷基键合固定相的制备

采用大孔硅胶和一氯硅烷制备了几种用于蛋白质水分离的大孔硅胶短链烷基键合固定相。     

高效液相色谱用硅胶键合固定相的研究进展

从新型固定相，传统固定相性能的改进两个方面综述了高效液相色谱中用硅胶键合固定相近几年来的研究发展概况，并对其发展予以展望。     

色谱填料制备技术及反相烷基硅胶键合相研究

综述了以硅胶为基质的高效液相色谱填料的合成方法以及反相键合相填料的最新研究进展,对其进行了评述并提出反相填料的研究方向。     

Separation and preconcentration followed by ICP-OES and ICP-MS determination of precious metals using silica gel chemically modified with dithiocarbamate groups

ABSTRACT

Silica gel chemically modified with dithiocarbamate groups (DTCS) was used for separation and preconcentration of precious metals and their subsequent determination in geological samples and their processing products by inductively coupled plasma optical emission spectrometry and inductively coupled plasma mass spectrometry. DTCS was characterized by TGA/DSC, FT-IR, and CHNS-analysis. DTCS quantitatively extracted Au³⁺, Pd²⁺, Pt²⁺, Pt⁴⁺ at 20°C from 0.5 to 4.0 M HCl media and Rh³⁺, Ir⁴⁺, Ru⁴⁺, and Os⁴⁺ at 95°C in the presence of 0.025 M SnCl₂. Two-column procedure was proposed to separate precious metals from matrix components and to separate kinetically inert precious metals from kinetically labile ones.     

表面活性剂辅助微波提取阳荷黄酮工艺条件的优化

采用表面活性剂辅助微波法提取阳荷中的黄酮。研究了表面活性剂种类及其添加量、微波辐射功率、辐射时间、料液比和pH对黄酮收率的影响。以单因素试验为基础,通过正交试验优化了黄酮的提取工艺。确定较佳工艺条件为:pH=4.0,料液比1∶40(g∶mL),表面活性剂十二烷基硫酸钠质量分数10.5%,微波辐射时间2.4 min,微波辐射功率550 W。在此条件下,黄酮的收率为12.7%。相比于热回流法、超声提取法和微波提取法,通过表面活性剂辅助微波提取,阳荷中黄酮收率分别提高了41.1%,56.8%和46.0%。该法提取效率高、工艺简单。     

C型硅胶与偶联剂KH-560键合反应初探

运用甲苯回流法制备了3-缩水甘油基丙基硅胶键合相,并通过正交实验及单因素实验,探讨了物料配比、反应温度、反应时间等条件对键合相形成的影响规律。结果表明：KH-560含量的适当增加、反应温度的升高、反应时间的延长均能促进键合相的形成。同时还发现反应温度过高、反应时间过长会导致KH-560的分解。适合硅胶和KH-560键合的反应条件是：硅胶︰KH-560=1︰2（质量比）;反应温度65~80 ℃;反应时间48~72 h。该条件可避免KH-560的分解。最后通过元素分析法所得氢含量与理论计算氢含量的比较,得出KH-560分子上只有1个甲氧基参与了键合反应。     

A method for bleaching rice bran oil with silica gel

The color of bleached rice bran oil can be improved by silica gel treatment of the oil miscella before or after dewaxing. A silica gel/oil/solvent ratio of 1:5:5 (wt/wt/vol) is suitable. Silica gel treatment can be carried out either by column percolation or by merely shaking the miscella with the gel followed by decantation. However, column percolation is more efficient, with 30–72% color reductionvs. 19–36% reduction for shaking and decanting.     

竹叶黄酮护肤霜功效的研究

将竹叶黄酮添加到护肤霜基质中制得竹叶黄酮护肤霜,按有关标准对产品进行了性能测试和评价.护肤功效检测表明,含质量分数为1.5％的竹叶黄酮护肤霜在UVB区的平均吸光度为1.273,在UVA区的防晒效果达到三星级,具有较好的防晒功效;有优良的保湿功效;能显著降低皮肤黑色素含量而美白皮肤;可改善皮肤纹理度,降低皮肤粗糙度;增加皮肤弹性;且人体试验安全、无刺激性,是一种天然的化妆品功能性成分添加剂.     

香樟叶中黄酮类化合物的提取

采用乙醇提取法,研究香樟叶黄酮类化合物的提取工艺。以芦丁为标准样品,建立了芦丁标准工作曲线回归方程:A=12.2875C-0.014667,相关系数r=0.9995。用正交实验研究了乙醇浓度、料液比、提取温度和提取时间对黄酮类化合物提取率的影响。结果表明,最优提取条件为:乙醇浓度60%,料液比1∶10,温度75℃,提取时间2.5 h。     

Directly silica bonded analytical reagents: synthesis of 2-mercaptobenzothiazole–silica gel and its application as a new sorbent for preconcentration and determination of silver ion using solid-phase extraction method

A new and efficient method is described for the easy synthesis of directly bonded 2-mercaptobenzothiazole–silica gel. This new bonded analytical reagent is used as an effective sorbent for the solid-phase extraction of silver ion from aqueous solutions. Conditions for effective adsorption of trace levels of silver ion concentration are optimized with respect to different experimental parameters in column process. Sodium thiosulfate solution could efficiently elute the adsorbed silver ion from the surface of the sorbent which then was determined by atomic absorption spectroscopy (AAS). Common coexisting ions did not interfere with the separation and determination. The preconcentration factor is 300 (1 ml elution volume) for a 300 ml sample volume. The sorbent exhibited excellent stability and its sorption capacity under optimum conditions has been found to be 343 μg of silver per gram of sorbent. The relative standard deviation under optimum conditions is 2.04% (n=7). Accuracy of the method was estimated by using test samples of natural water spiked with different amounts of silver ion. The method is simple and inexpensive.