导数光谱法测定松香中枞酸和脱氢枞酸

本文用导数光谱法对松香中枞酸和脱氢枞酸的测定进行了方法研究和比较,并用四阶导数光谱对几种不同松香中枞酸和脱氢枞酸进行了同时测定,结果令人满意。该法灵敏度高,能较好地消除背景干扰。相对标准偏差0.17％;枞酸回收率99.17％;脱氢枞酸回收率96.27％。     

脱氢枞胺及其衍生物的研究与应用进展

脱氢枞胺及其衍生物在手性拆分、金属离子浮选、表面活性、杀菌、医药、染料等领域有着重要的用途。本文对脱氢枞胺的制备、脱氢枞胺成盐衍生物以及脱氢枞胺成键衍生物的研究与应用进展进行了综述,并对脱氢枞胺及其衍生物的研究及应用前景进行了展望。     

脱氢枞酸及其衍生物生物活性的研究进展

脱氢枞酸是一种从松香中分离出来的具有三环二萜结构的树脂酸,具有广泛的生物活性,在医药、工业、农业等领域具有重要的用途。本文综述了脱氢枞酸衍生物在抑菌、抗病毒、K离子通道开启、抗肿瘤等生物活性方面的研究进展,展望了脱氢枞酸衍生物的研究和应用前景。     

核磁共振法测定松香中树脂酸总量及枞酸与脱氢枞酸含量

本文用吡嗪作分子间内标，利用氢核磁共振（＾１Ｈ－ＮＭＲ）积分法对松香中枞酸，脱氢枞酸及树脂酸总量进行了测定，并对该方法的可靠性进行了研究和比较，结果令人满意。该法不仅可以克服松香中各异物体及同系物的干扰，而且不必用极难制备和保存的天然纯纵酸和脱氢枞酸作标样。     

脱氢枞基α-氨基膦酸酯的合成

以Yb(OTf)3为催化剂,聚氧乙基-α-生育酚癸二酸酯(PTS)为助溶剂,水为溶剂,经三组分[脱氢枞胺(1)、亚磷酸二乙酯(2)和芳醛(3a~3f)]缩合反应合成了6个含脱氢枞基的α-氨基膦酸酯衍生物(4a~4f),产率65%~75%,其结构经1H NMR,FT-IR和EI-MS确证。考察了溶剂和助溶剂对4a产率的影响。结果表明:在最优反应条件[以水为溶剂,1 1 mmol,2 1.2 mmol,3a 1 mmol,Yb(OTf)30.01 mmol,PTS 2 m L,于室温反应1 h]下,4a产率71%。Yb(OTf)3循环使用5次,4a产率64%。     

方酸菁荧光探针的应用研究进展

功能性方酸菁染料具有独特的D-A-D共轭结构,其在可见光和近红外区域有强烈的吸收和荧光发射。方酸菁染料作为近红外荧光探针母体被应用于蛋白质、氨基酸、一些生物小分子、环境污染物及金属离子等的检测。本文结合课题组近几年工作综述了方酸菁染料在蛋白质、氨基酸、生物小分子、阳离子和其它物质检测方面的应用。     

基于喹啉的金属离子荧光探针的研究进展

主要总结了近几年来基于喹啉及其衍生物的金属离子荧光探针的研究进展,重点讨论了检测Cd~(2+)、Zn~(2+)的喹啉类荧光探针,主要从探针的荧光响应能力、配位机制和实际应用几方面的特征进行了分析总结。为进一步设计与构建新型金属离子荧光探针提供了思路。     

溶剂法合成脱氢枞酸/甲基丙烯酸缩水甘油酯酯化物

以脱氢枞酸(DHR)和甲基丙烯酸缩水甘油酯(GMA)为原料,对苯二酚(HQ)为阻聚剂,三乙胺为催化剂,采用溶剂法研究了合成脱氢枞酸/GMA酯化物(DG)的过程中反应温度、单体配比[n(GMA)∶n(DHR)]、催化剂用量和反应时间对酯化反应的影响.在单因素实验的基础上,利用正交实验对合成条件进行了优化.采用红外光谱、核磁氢谱和热重对DG进行表征.结果表明:成功合成了含羟基的DG,其热稳定性较好;酯化反应的较优条件为反应温度120℃,n(GMA)∶n(DHR)=1.2∶1,三乙胺用量为DHR质量分数的0.5%,反应时间为4 h,该条件下合成的DG酯化率达到99.4%.     

新型脱氢枞胺衍生物的合成及其抗自由基活性

通过不同的方法在脱氢枞胺中引入酰腙、没食子酸、肟、异烟基等对清除自由基有效果的基团,设计合成了几种新型的脱氢枞胺衍生物.利用1H NMR,13C NMR,IR和HRMS对所有合成的化合物进行了结构表征.测试了所合成的化合物对清除超氧阴离子(O2-)和二苯代苦味酰基自由基(DPPH·)的活性,其中N-(3,4,5-三羟基苯甲酰基)-脱氢枞胺(6)对O-2的抑制率达到38.18%,是常用抗氧化药物Vc(18.35%)的两倍以上;对(DPPH·)的半数抑制浓度为0.002×103 mg/L,远优于Vc(0.236×103 mg/L).     

Click synthesized dianthryl-TTFV: an efficient fluorescent turn-on probe for transition metal ions

Tetrathiafulvalene vinylogue (TTFV) was functionalized with two anthryl fluorophores via Cu(I)-catalyzed alkyne-azide [3 + 2] cycloaddition, forming a dianthryl-TTFV hybrid to show fluorescent turn-on sensing behaviour for Cu(2+), Fe(2+), and Cd(2+) ions in THF with remarkably low detection limit down to the sub-ppm level.     

A new selective fluorescent probe for lead ions

A new fluorescent probe(BPbl) for Pb~(2+) has been synthesized,where diethanolamine(receptor) is linked with 4,4-difluoro-4-bora-3a, 4a-diaza-s-indacene(BODIPY)(fluorophore) via a methylene group(spacer).The absorption(496 nm) and emission (505 nm) wavelengths are in visible range.The fluorescence quantum yields of the lead-free and lead-bound states of BPb_1 in acetonitrile are 0.013 and 0.693,respectively.The large chelation enhanced fluorescence effect(CHEF) with Pb~(2+) can be explained by the blocki...     

甾体席夫碱荧光探针的微波合成及其对金属离子的识别

采用石胆酸与2-羟基-1-萘甲醛为原料,合成了一种新型甾体席夫碱结构荧光探针(L),其结构经NMR,IR,ESI-MS和元素分析表征。在pH 7.0缓冲溶液溶液中,探针L可以高选择性荧光识别Al^3+,检测限为8.0 nmol/L,适用范围为pH 6~10。当Al^3+与探针L配位时,生成1:1型配合物(L-Al^3+),在365 nm紫外灯照射下,由无色变成亮蓝色强荧光。     

8-Hydroxyquinoline benzoates as highly sensitive fluorescent chemosensors for transition metal ions

[graph: see text] 8-Hydroxyquinoline benzoates were developed as a new set of 8-HQ derivatives for highly sensitive fluorescent chemosensors for transition metal ions. A prominent fluorescence enhancement was found in the presence of transition metal ions such as Hg2+ and Cu2+, and this was suggested to result from the suppression of radiationless transitions from the npi state in the chemosensors.     

A monostyryl-boradiazaindacene (BODIPY) derivative as colorimetric and fluorescent probe for cyanide ions

We developed a novel boradiazaindacene derivative to detect cyanide ions in solution at micromolar concentrations. This structurally simple chemosensor displays a large decrease in emission intensity and a reversible color change from red to blue on contact with cyanide ions. Highly fluorescent polymeric films can be obtained by doping with the chemosensor. Such polymeric materials can be used for the sensing of the cyanide ions in polymer matrices.     

New fluorescent chemosensors for metal ions in solution

After a brief introduction on the main transduction mechanisms for metal ion detection by fluorescence, this paper reviews ligand molecules containing fluorophores synthesized and employed in metal ions sensing in solution in the last few years. With the aim of making more readable the paper we have organized it by dividing the subject first for type of fluorophore, then type of metal ion. Because of many acronyms a glossary has been inserted.     

Graphene quantum dots combined with copper(II) ions as a fluorescent probe for turn-on detection of sulfide ions

A fluorescent probe for the sensitive and selective determination of sulfide ions is presented. It is based on the use of graphene quantum dots (GQDs) which emit strong and stable blue fluorescence even at high ionic strength. Copper(II) ions cause aggregation of the GQDs and thereby quench fluorescence. The GQDs-Cu(II) aggregates can be dissociated by adding sulfide ions, and this results in fluorescence turn on. The change of fluorescence intensity is proportional to the concentration of sulfide ions. Under optimal conditions, the increase in fluorescence intensity on addition of sulfide ions is linearly related (r ² = 0.9943) to the concentration of sulfide ions in the range from 0.20 to 20 μM, and the limit of detection is 0.10 μM (at 3 σ/s). The fluorescent probe is highly selective for sulfide ions over some potentially interfering ions. The method was successfully applied to the determination of sulfide ions in real water samples and gave recoveries between 103.0 and 113.0 %.

Graphene quantum dots (GQDs) emit strong blue fluorescence which, however, is quenched by copper(II) ions due to the formation of GQDs-Cu(II) aggregates. Fluorescence is recovered by sulfide ions due to the dissociation of GQDs-Cu(II) aggregates.

     

Synthesis and fluorescent properties of bis-salicyloyl hydrazide metal complexes of some group IV ions

Four novel organometallic compounds containing tin(IV), titanium(IV) and zirconium (IV) ions were synthesized and strong fluorescent emission was observed from two tin(IV) complexes.     

A fluorescent probe for zinc ions based on N-methyltetraphenylporphine with high selectivity

N-methyl-alpha,beta,gamma,delta-tetraphenylporphine (NMTPPH) has been used to detect trace amount of zinc ions in ethanol-water solution by fluorescence spectroscopy. The fluorescent probe undergoes a fluorescent emission intensity enhancement upon binding to zinc ions in EtOH/H(2)O (1:1, v/v) solution. The fluorescence enhancement of NMTPPH is attributed to the 1:1 complex formation between NMTPPH and Zn(II) which has been utilized as the basis for the selective detection of Zn(II). The linear response range covers a concentration range of Zn(II) from 5.0x10(-7) to 1.0x10(-5)mol/L and the detection limit is 1.5x10(-7)mol/L. The fluorescent probe exhibits high selectivity over other common metal ions except for Cu(II).