The isolation of erysimoside

Summary 1. The conditions for the purification of a crude extract from resinous substances and sugars by organic solvents and from ballast substances by ion-exchange purification, and also the extraction of erysimoside from the purified aqueous solution, have been investigated.2. The yield of erysimoside by the method described has been increased to 2% of the weight of the seeds.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 22–25, January–February, 1975.     

The isolation of erysimoside from the seeds ofErysimum canescens

Chemistry of Natural Compounds -     

血迹的光度法测定及其在物证分析中应用

在pH 2.4的C-L缓冲介质中人血清蛋白与氯磺酚S反应生成蓝色复合络合物,其吸收峰位于635 nm波长处,摩尔吸光率(ε635)为2.49×106L·mol-1·cm7-1,算得标准工作曲线的线性回归方程为A=3.66×10-1C-0.026,相关系数为1.000,人血清蛋白质量浓度在160 mg·L-1以内呈线性关系.方法的最低检测浓度为0.25 g·L-1,基于以上结果,提出应用上述方法于物证分析中测定血迹中人血清蛋白的含量.     

Analysis of silicates

Conclusions Using a new rapid method, K₂O, Na₂O, CaO, MgO, Al₂O₃, and Fe₂O₃ were determined in silicates according to a single procedure, from a single sample.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1648–1655, August, 1967.     

Analysis of Toxaphene

Abstract

Toxaphene, a widely and chlorinated hydrocarbon insecticide produced by chlorination of camphene, consists of a poorly defined mixture of at least 180–190 substances. Most of these conform the formulars C₁₀H₁₈-_nCl_n and C₁₀H₁₆-_nCl_n, where n is 6–10. Although the chromatographic behaviour of the toxaphene components is extremely similar, seven components have been isolated up to now, six of which are hepta- to decachlor derivatives of bornane. In the following work, isolation and identification of these compounds with the help of spectroscopical methods are described and their behaviour under biotic and abiotic conditions are studied. The experiments shown, that toxaphene is slowly to rapidly degraded in various environmental systems.     

Analysis of anti-hormones

Residues of anti-hormones in biological materials are routinely determined at the ppb-level¹ by specific detection through high-performance thin-layer chromatography with fluorimetric detection or capillary gas chromatography with electron-capture detection backed up by a selective single step extraction.     

Analysis of steroids

A report on the 3rd Symposium on the Analysis of Steroids, held in Sopron, Hungary, 20–22 October 1987     

Analysis of pyrites

A brief survey is given of the recommended procedures for the analysis of pyrites and the results of control analyses.     

区分化学分析法与仪器分析法适用性的实践教学探索

根据方法原理,分析化学的常用分析方法可分为化学分析法和仪器分析法。高灵敏度、高选择性、高自动化、数字化和智能化已成为分析化学的发展方向,仪器分析法成为了分析化学发展的主流和热点。因此,在校本科生往往忽视化学分析法的重要作用以及适用范围,陷入仪器分析法为万能分析方法的误区。本文选用络合滴定法和原子吸收光谱法分别对常量含铅样品进行测试,通过考察测试结果的相对误差大小,探索了化学分析法和仪器分析法的适用范围,从而纠正了在校本科生的唯仪器分析法的错误观念。     

Analysis of herbicides

Herbicides, like other pesticides, leave undesirable residues on the treated plants. To analyze them, the plant material is extracted and the herbicidal residues are separated from the bulk of the co-extractives of natural origin, about which too little is known. Quantitative determinations at the ppm level are best performed by gas chromatography with highly sensitive, specific detectors. In food control, where the history of the sample is unknown, the herbicide residues are identified and determined quantitatively together with the residues of other pesticides.