四异硫氰合钴(Ⅱ)-4-氯苄基喹啉季铵盐的合成及其晶体结构

合成了1种含异硫氰合钴配阴离子和4-氯苄基喹啉鎓离子的季铵盐[4ClBzQl]2[Co(NCS)4]([4ClBzQl]+为4-氯苄基喹啉鎓离子);利用元素分析仪、红外光谱仪、紫外-可见光谱仪、电子喷雾质谱仪和X射线衍射仪表征了其组成和结构.结果表明,合成的季铵盐为三斜晶系,空间群P-1,晶胞参数为a=1.062 3(1)nm,b=1.406 9(2)nm,c=1.429 2(2)nm,α=67.11(1)°,β=72.60(1)°,γ=79.24(1)°,V=1.871 7(4)nm3,Z=2,Dc=1.421g/cm3,GOOF=1.017,R1=0.040 0,wR2=0.095 2.标题化合物分子由1个四面体形的[Co(NCS)4]2-阴离子和2个[4ClBzQl]+阳离子组成;π…π、p…π堆积作用和C-H…N、C-H…S氢键作用促进了晶体的稳定性.     

银二氧化硅核壳增强异硫氰酸荧光素酯滤纸基质室温磷光法检测赖氨酸

银二氧化硅核壳( Ag@ SiO2)可使异硫氰酸荧光素酯(FITC)产生金属增强室温磷光(MERTP).当所研究体系加入赖氨酸时,其MERTP猝灭.据此,建立了检测赖氨酸的新方法.在FITC和Ag@ Si02的加入量之比为1∶1.5,pH- 8.0时,本方法检测赖氨酸的检出限为0.270 μmol/L;线性范围为1.50～90.5 μmol/L,人二合成样品加标回收率为97.0％～108.0％;相对标准偏差为2.1％(n=9).本方法用于检测赖氨葡锌颗粒和赖氨酸磷酸氢钙片中的赖氨酸,结果满意.     

含噻二唑基硫脲类化合物的合成

以噻二唑-2-氨甲基酚(1)为原料, 与异硫氰酸苯酯反应, 以中等到良好的产率得到噻二唑基N-苯基取代硫脲类化合物(3a~3i); 而化合物1与活性较高的N,N-二甲胺基硫代甲酰氯反应, 则可以得到—NH和—OH同时反应的含有N,N-二甲基硫脲和N,N-二甲基硫代氨基甲酸芳酯官能团的产物. 利用核磁共振、 红外光谱以及高分辨质谱等手段对产物结构进行了表征.     

Characterization of Conjugates between α-Lactalbumin and Benzyl Isothiocyanate—Effects on Molecular Structure and Proteolytic Stability

In complex foods, bioactive secondary plant metabolites (SPM) can bind to food proteins. Especially when being covalently bound, such modifications can alter the structure and, thus, the functional and biological properties of the proteins. Additionally, the bioactivity of the SPM can be affected as well. Consequently, knowledge of the influence of chemical modifications on these properties is particularly important for food processing, food safety, and nutritional physiology. As a model, the molecular structure of conjugates between the bioactive metabolite benzyl isothiocyanate (BITC, a hydrolysis product of the glucosinolate glucotropaeolin) and the whey protein α-lactalbumin (α-LA) was investigated using circular dichroism spectroscopy, anilino-1-naphthalenesulfonic acid fluorescence, and dynamic light scattering. Free amino groups were determined before and after the BITC conjugation. Finally, mass spectrometric analysis of the BITC-α-LA protein hydrolysates was performed. As a result of the chemical modifications, a change in the secondary structure of α-LA and an increase in surface hydrophobicity and hydrodynamic radii were documented. BITC modification at the ε-amino group of certain lysine side chains inhibited tryptic hydrolysis. Furthermore, two BITC-modified amino acids were identified, located at two lysine side chains (K32 and K113) in the amino acid sequence of α-LA.     

胍基木吡喃糖苷的合成及其抗HIV蛋白酶活性

2,3,4-三-O-乙酰基-b-D-木吡喃糖基异硫氰酸酯1与2-氨基-4/6-取代-苯并噻唑2a～2e反应, 生成糖基硫脲衍生物3a～3e, 再在伯胺存在下经氯化汞脱硫, 得到一系列新的胍基木吡喃糖苷类化合物4a～4e, 5a～5e, 6a～6e, 7a～7e, 所有新化合物的结构均经IR, ¹H NMR, MS谱和元素分析证实, 所得产物均为β-构型. 生物活性测试结果表明, 化合物4c, 5b, 6b～6d, 7b等对HIV-1蛋白酶表现出了较高的抑制活性.     

Formulation of Isopropyl Isothiocyanate Loaded Nano Vesicles Delivery Systems: In Vitro Characterization and In Vivo Assessment

Isopropyl Isothiocyanate (IPI) is a poorly water-soluble drug used in different biological activities. So, the present work was designed to prepare and evaluate IPI loaded vesicles and evaluated for vesicle size, polydispersity index (PDI) and zeta potential, encapsulation efficiency, drug release, and drug permeation. The selected formulation was coated with chitosan and further assessed for the anti-platelet and anti-thrombotic activity. The prepared IPI vesicles (F3) exhibited a vesicle size of 298 nm ± 5.1, the zeta potential of −18.7 mV, encapsulation efficiency of 86.2 ± 5.3% and PDI of 0.33. The chitosan-coated IPI vesicles (F3C) exhibited an increased size of 379 ± 4.5 nm, a positive zeta potential of 23.5 ± 2.8 mV and encapsulation efficiency of 77.3 ± 4.1%. IPI chitosan vesicle (F3C) showed enhanced mucoadhesive property (2.7 folds) and intestinal permeation (~1.8-fold) higher than IPI vesicles (F3). There was a significant (p < 0.05) enhancement in size, muco-adhesion, and permeation flux achieved after coating with chitosan. The IPI chitosan vesicle (F3C) demonstrated an enhanced bleeding time of 525.33 ± 12.43 s, anti-thrombin activity of 59.72 ± 4.21, and inhibition of platelet aggregation 68.64 ± 3.99%, and anti-platelet activity of 99.47%. The results of the study suggest that IPI chitosan vesicles showed promising in vitro results, as well as improved anti-platelet and anti-thrombotic activity compared to pure IPI and IPI vesicles.     

Some multiring fused quinazolines

Summary A number of condensed quinazolines have been synthesized by the reaction of 5-phenyl-3-hydrazino-1,2,4-triazolo[4,3-c]quinazoline with appropriate phenyl isothiocyanates, arylcarbaldehydes, ethyl orthoformate, acetic anhydride, and nitrous acid. The IR and¹H NMR spectra of the products are presented.Dedicated to Professor Dr.Fritz Sauter in honour of his 65 birthday     

异硫氰酸钕与二甲基亚砜的配合物在DMSO—H2O中的积分溶解热

二甲基亚砜DMSO是应用广泛的有机溶剂,系亚砜类有机配体(含S=O基)的代表,人们对它以及它的金属配合物进行了多方面的研究。文献[1—4]测量了DMSO与H_2O的混合热。本文测量了异硫氰酸钕与二甲基亚砜生成的固体配合物Nd(NCS)_3·5DMSO在不同浓度     

2,3,4,6-四-O-乙酰基-β-D-吡喃葡萄糖基异硫氰酸酯的合成及晶体结构

采用葡萄糖作原料经乙酰化、溴化和硫氰酸化三步合成了2,3,4,6-四-O-乙酰基-β-D-吡喃葡萄糖基异硫氰酸酯,培养出了单晶,用X射线衍射分析了其晶体结构.结果表明,晶体为正交晶系,P212121空间群,a=0.72624(2)nm,b=1.17508(2)nm,c=2.17210(5)nm,α=β=γ=90°,V=1.85365(7)nm,Z=4,R=0.0531,wR=0.1359.     

2-硫代-3-烷基-5-苯基亚甲基-4-咪唑啉二酮衍生物的有效合成新方法

应用烯基膦亚胺与二硫化碳、一级脂肪胺的串联aza-Wittig反应合成了2-硫代-3-烷基-5-苯基亚甲基-4-咪唑啉二酮衍生物。提出了可能的环化反应机理，探讨了所合成化合物的成环反应条件和波谱性质。经元素分析、IR,1H NMR和MS确证产物均为新化合物。