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1.
Summary A new approach is described, and a novel explanation presented, for the high performance liquid chromatographic analysis of cystine and cysteine as their phenylthiocarbamyl derivatives. PTC cystine and cysteine have been eluted with the same retention times and molar responses, most probably due to electrophilic attack of phenylisothiocyanate on cystine resulting in the scission of the disulfide bond yielding two moles of cysteine. Further, total PTC cystine and cysteine have been measured both in model solutions and in standard protein hydrolyzates (lysozyme, bovine albumin, ribonuclease) with the same linearity as the other ineteen amino acids. The reproducibility of the measurements, at the 250–750 pmole level, proved to be 4.1% (Relative Standard Deviation %) or less. 相似文献
2.
李炳奇 《石河子大学学报(自然科学版)》1997,1(1):77-80
本文阐述了以毛发为主要原料生产L-胱氨酸过程中杂质的来源,种类及除去方法,并提供了有关的反应条件。 相似文献
3.
Determination of cysteine,homocysteine, cystine,and homocystine in biological fluids by HPLC using fluorosurfactant‐capped gold nanoparticles as postcolumn colorimetric reagents
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We have demonstrated for the first time the suitability of fluorosurfactant‐capped spherical gold nanoparticles as HPLC postcolumn colorimetric reagents for the direct assay of cysteine, homocysteine, cystine, and homocystine. The success of this work was based on the use of an on‐line tris(2‐carboxyethyl)phosphine reduction column for cystine and homocystine. Several parameters affecting the separation efficiency and the postcolumn colorimetric detection were thoroughly investigated. Under the optimized conditions, cysteine, homocysteine, cystine, and homocystine in human urine and plasma samples were determined. Detection limits for cysteine, homocysteine, cystine, and homocystine ranged from 0.16–0.49 μM. The accuracy in terms of recoveries ranged between 94.0–102.1%. This proposed method was rapid, inexpensive, and simple. 相似文献
4.
研究了用废牦牛毛为原料提取重要医药原料胱氨酸,用制备胱氨酸后的母液生产新型饲料添加剂——复合氨基酸螯合物. 相似文献
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罗美英 《广东微量元素科学》2004,11(6):20-22
为评价口服氨基酸螯合钙胶囊配合胱氨酸片对脱发患者的临床疗效 ,将 1 2 0例脱发患者随机分为治疗组与对照组。治疗组 60例用氨基酸螯合钙胶囊 ( 1g/d ,1粒 ,qd ,PO)和胱氨酸片( 3 0 0mg/d ,3次 /d ,PO)治疗 ,对照组 60例用胱氨酸片 ( 3 0 0mg/d ,3次 /d ,PO)治疗 ,两组用药均为 1 2周。结果表明 ,治疗组与对照组相比 ,治疗组较对照组的临床症状有明显改善 ,头发中微量元素锌、铁、钙的含量有显著性差异 (P <0 0 5 )。脱发患者经补充有效的所需微量元素配合胱氨酸治疗收到良好效果。 相似文献
7.
C. A. A. Ghumman A. M. C. Moutinho A. Santos A. Tolstogouzov O. M. N. D. Teodoro 《Journal of mass spectrometry : JMS》2012,47(5):547-551
Two different human stones, cystine and cholesterol from the kidney and gall bladder, were examined by time‐of‐flight secondary ion mass spectrometry using Ga+ primary ions as bombarding particles. The mass spectra of kidney stone were compared with those measured for the standard compounds, cystine and cysteine. Similar spectra were obtained for the stone and cystine. The most important identification was based on the existence of the protonated molecules [M + H]+ and deprotonated molecules [M‐H]‐. The presence of cystine salt was also revealed in the stone through the sodiated cystine [M + Na]+ and the associated fragments, which might be due to the patient treatment history. In the gallstone, the deprotonated molecules [M‐H]+ of cholesterol along with relatively intense characteristic fragments [M‐OH]+ were detected. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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用十二烷基苯磺酸钠萃取酪氨酸 总被引:2,自引:0,他引:2
用溶剂萃取法从盐酸介质中萃取酪氨酸。以十一烷基苯磺酸钠为萃取剂,以磺化煤油为稀释剂,磷酸三丁酯为调相剂,考察了各种因素对酪氨酸分配比的影响,确定了萃取及反萃过程的最佳工艺条件。研究了萃取反萃过程的热效应,计算了萃取和反萃取的理想级数。 相似文献
10.
李炳奇 《石河子大学学报(自然科学版)》1995,(2)
对毛发水解制取胱氨酸的反应条件进行了研究,得出了反应温度、盐酸浓度及水解时间与胱氨酸产率的关系,并提供了较好的回收盐酸的方法。 相似文献