脱氧核糖核酸分子在高分子溶液3个不同浓度区间的电泳迁移行为

 借鉴高分子亚浓溶液线团收缩理论 ,研究了脱氧核糖核酸 (DNA)片段在高分子溶液全浓度区间的电泳迁移行为。结果表明 ,在高分子稀溶液、亚浓溶液和浓溶液 3个不同浓度区间 ,DNA的电泳迁移行为各不同 ,DNA片段的分离在这 3个浓度区间也存在差异。     

新型安培检测毛细管电泳微系统

将电极、６ｃｍ分离毛细管、缓冲池、检测池集成于８．４×５．０ｃｍ有机玻璃片上,制作了一个毛细管电泳微系统。以碳纤维微盘电极作为工作电极,采用三电极体系柱端检测了１×１０－４ｍｏｌ／Ｌ多巴胺（ＤＡ）,具有良好的重现性,检测限３．６×１０－８ ｍｏｌ／Ｌ,线性范围５×１０－７～１×１０－４ｍｏｌ／Ｌ,并在该系统上分离了邻苯二酚（ＣＡ）和多巴胺的混合物。     

衍生化毛细管气相色谱法分离测定山梨醇和甘露醇

采用乙酸酐为衍生化试剂,吡啶为溶剂和催化剂,将山梨醇和甘露醇转化成易恽发的糖醇乙酰酯衍生物。用苯基氰丙基聚硅氧烷（BPX-70）毛细管色谱柱分离分析,使同分异构体的六元糖醇得到了很好的分离,并用内标法定量。山梨醇甘露醇的线性范围均为2.50g/L-12.5g/L,检测限分别为0.60ng和0.68ng。     

毛细管电泳法测定猪体组织中甜菜碱含量

建立了毛细管电泳法快速测定猪体组织中甜菜碱含量的方法。甜菜碱首先转化为苯甲酰甲基酯后直接上样测定。pH为 3 .0的磷酸缓冲溶液使甜菜碱酯化物和甜菜碱结构类似物酯化物之间以及酯化物和酯化剂之间都能很好地分离 ,这也省去了反应混合液的前处理。该法标准曲线的线性范围为 4～ 6 0 0mg L ,相关系数r为 0 .9999,最低检测限为 1mg L ,相对标准偏差为 2 .2 %～ 4.7% ,标准加入回收率为 95 9%～ 98.4%     

毛细管气相色谱法测定面粉中的过氧化苯甲酰

采用毛细管气相色谱法测定面粉中过氧化苯甲酰的含量。方法的线性范围为0.0-500.0μg/mL,检出限为1.0ng,RSD为0.564%-0.906%,回收率为92.7%-101.3%。该法可用于面粉质量的监测。     

环糊精衍生物作为气相色谱固定相的发展及应用

从环糊精及其衍生物作为气相色的分离机理出发介绍了影响这固定相的因素及其分离应用的近期发展,共评述56篇文章。     

高效毛细管电泳对农药手性拆分的进展

环境中使用的农药绝大多数都具有位置或光学异构体,而且同一农药的不同对映体通常也具有不同的药效和毒性,但是目前有关手性农药的研究还很少,高效毛细管电泳是一门特别适于手性分离研究的技术,综述了近年来利用高效毛细管电泳技术对手性农药进行拆分的研究,最后对该工作的发展前景进行了讨论。     

Measurement of bubble size distribution in protein foam fractionation column using capillary probe with photoelectric sensors

Bubble size is a key variable for predicting the ability to separate and concentrate proteins in a foam fraction ation process. It is used to characterize not only the bubble-specific interfacial a rea but also coalescence of bubbles in the foam phase. This article describes the development of a photoelectric method for measuring the bubble size distribution in both bubble and foam columns for concentrating proteins. The method uses a vacuum to withdraw a stream of gas-liquid dispersion from the bubble or foam column through a capillary tube with a funnel-shaped inlet. The resulting sample bubble cylinders are detected, and their lengths are calculated by using two pairs of infrared photoelectric sensors that are connected with a high-speed data acquisition system controlled by a microcomputer. The bubble size distributions in the bubble column 12 and 1 cm below the interface and in the foam phase 1 cm above the interface are obtained in a continuous foam fractionation process for concentrating ovalbumin. The effects of certain operating conditions such as the feed protein concentration, superficial gas velocity, liquid flow rate, and solution pH are investigated. The results may prove to be helpful in understanding the mechanisms controlling the foam fractionation of proteins.     

Sorption of aliphatic ketones from aqueous solutions by starch cryotextures

Capillary gas chromatography was applied to study the sorption of aliphatic ketones (C₆—C₁₁), including metamers, from aqueous solutions by corn starch cryotextures. The amount of ketones sorbed by cryotextures depends linearly on their concentrations in the initial sol. Equations describing the concentration dependence of sorption were proposed. The shape of sorption isotherms reflects the strength of sorption. The binding constants and the number of binding sites were determined for weakly sorbed ketones. The length of alkyl substituent and the position of the functional group are the crucial factors governing the sorption of ketones under conditions of excess binding sites. It was found that the degree of sorption increases with an increase in the carbon chain length from 6 to 9 carbon atoms. The presence of cooperation of binding sites for ketone sorption by cryotextures was demonstrated. The major part of ketones is sorbed irreversibly. This fact points to the formation of supramolecular complexes. Ketones with lower molecular masses are better sorbed by cryotextures than by native starch grains.     

Identification and Biological Activity of Volatile Organic Compounds Emitted by Plants and Insects. IV. Composition of Vapor Isolated from Certain Species of Artemisia Plants

The components of fragrance from four wormwood species of theArtemisiaL. genus were analyzed by GC-MS. The major and minor components of volatile essential oils typical of the studied plant species were determined.