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In order to improve the mechanical properties of HTPB four component and CL-20/CAP propellants and solve the problem of "dewetting" at the interface of the novel propellant filler matrix, a new Schiff base bonding agent was designed and synthesized. The bonding effect and mechanical properties of the propellant were characterized by Fourier infrared spectrosco-py, scanning electron microscopy and universal material tensioning machine. The results showed that the synthesized new Schiff base bonding agent contained the essential functional groups of the bonding agent and had obvious bonding on the AP surface. The new Schiff base bonding agent was expected to replace the toxic MAPO and significantly improve the mechanical properties of HTPB four component propellant, the strength of HTPB four component propellant reached 0. 7MPa, and the elongation was greater than 55% at room temperature. The elongation at high and low temperature are greater than 50% and 60% respectively. The processing performance of HTPB four component propellants can be significantly improved. In CL-20/CAP propellant, the new Schiff base bonding agent can improve the strength and elongation of the propellant at the same time. [ABSTRACT FROM AUTHOR]

During the molding process of mycelium bio-composites, mycelium plays an important role as an adhesive. The surface of the substrate forms a special adhesion interface with the mycelium, and hot pressing can improve the interface bonding effect between mycelium and substrate, which has an important effect on the mechanical properties of the composite. In this article, the poplar veneer was taken as the raw material, and three white rot fungi, namely Trametes versicolor, Fomes fomentarius, and Pycnoporus sanguineus were used to colonize it for 14 days. Mycelium/wood bonding interface was formed under hot pressing, and the adhesion strength of the poplar veneer/mycelium interface was evaluated by a single-lap shear test. The results showed that during the formation process of the mycelium/poplar veneer bonding interface, white rot decay caused changes in the surface properties of the veneer, and hot pressing promoted the reaction of the adhesion interface. The mycelium film of Pycnoporus sanguineus gave rise to the best adhesion performance by hot pressing at 150 and 1.5 MPa, with a lap-shear strength of (1.34±0.11) MPa. The bonding interface between mycelium and wood was formed by mechanical interlocking, hydrogen bonding, Schiff base reaction and the repolymerization of lignin. This work could provide reference for regulating the properties of mycelium bio-composites. [ABSTRACT FROM AUTHOR]

BACKGROUND: Clinical skin wound healing continues to be a significant concern, and tissue repair research has moved to the forefront with the development of biomaterials with immunomodulatory properties. Therefore, it is crucial to research wound dressings that have immunomodulatory properties. OBJECTIVE: To prepare chitosan hydrogels that have been modified by arginine with different configurations and assess their capacity to speed up wound healing in a rat animal model. METHODS: (1) In vitro trial: Chitosan modified by pure L-arginine, pure D-arginine, and L-arginine and D-arginine was synthesized by EDC/NHS system, which was then crosslinked with aldehyde-modified four-arm polyethylene glycol. Different chitosan-based hydrogels (CS-L, CS-D, and CS-DL) were finally formed via the Schiff base reaction. Three kinds of hydrogel extracts were co-cultured with fibroblasts respectively. Hydrogel cytocompatibility was assessed using the CCK- 8 assay and live/dead staining. The effect of hydrogel on the migration capacity of fibroblasts was assessed by using a scratch test. Three kinds of hydrogels were incubated with rat erythrocyte suspension respectively to evaluate the hemocompatibility of the hydrogels. The hydrogel extract was co-cultured with RAW264.7 macrophages to test the hydrogels’ capacity to enhance macrophage NO generation and polarize macrophage phenotype. (2) In vivo experiment: A total of 36 adult SD rats were divided into 4 groups with 9 rats in each group by the random number table method. Two full-layer skin defect wounds of 2 cm× 2 cm were made on the back of each rat. Normal saline was added to the wounds of the control group, and corresponding hydrogel was added to the wounds of the CS-L, CS-D, and CS-DL groups, respectively, and then bandaged and fixed. The wound healing was observed regularly after operation. Hematoxylin-eosin staining was performed at 3, 10, and 21 days after operation. The samples were collected 10 days after operation and M2 macrophage immunofluorescence staining was performed. RESULTS AND CONCLUSION: (1) In vitro experiments: Under scanning electron microscopy, the three kinds of hydrogels exhibited obvious interpenetrating network structures with pore sizes ranging from 70-200 μm. The three kinds of hydrogels have good swelling performance, degradation performance, selfhealing performance, and suitable mechanical strength. The three kinds of hydrogels had good cytocompatibility and hemocompatibility and could promote the migration of fibroblasts. All three kinds of hydrogels had the ability to promote the polarization of macrophages, and CS-D hydrogels had the strongest ability to promote the polarization of macrophages. CS-L hydrogel could significantly promote the production of NO in macrophages. (2) In vivo experiment: 3 and 10 days after operation, the wound healing rate in the CS-L and CS-D groups was higher than that in the control group (P < 0.05). After 21 days, the wound healing rate of the three hydrogel groups was higher than that of the control group. Hematoxylin-eosin staining displayed that a large number of inflammatory cells were infiltrated in the wound tissue of rats in all groups, accompanied by neovessels and fibroblasts 3 days after operation. 10 days after operation, there was still more inflammatory cell infiltration in the wound of the control group, and the inflammation of the other three groups was improved, especially the decrease of inflammatory cells in the CS-D group was more obvious. 21 days after operation, the wound epithelium of each group was well repaired, and there was basically no inflammatory cell infiltration in the CS-L and CS-D groups, while there was still a small amount of inflammatory cell infiltration in the control group. Immunofluorescence staining revealed that the number of M2-type macrophages in the CS-D group was higher than that in the other three groups (P < 0.05). (3) The results conclude that chitosan hydrogels modified by different configurations of arginine can promote wound healing through different mechanisms. [ABSTRACT FROM AUTHOR]

The Comprehensive Science Training Experiment is a crucial component in the cultivation of top-notch talents in the field of scientific innovation. This article introduces a comprehensive experiment on the synthesis and characterization of a star-shaped polyamine in the organic chemistry science training course. Through this experiment, students can gain an understanding of the cutting-edge research and advancements in polyamine chemistry, apply their theoretical knowledge to design synthetic routes for target products, deepen their understanding of the basic principles and experimental methods of diazotization, Schiff base reaction, and Suzuki coupling reaction, master the techniques of monitoring reactions using thin-layer chromatography and separating products through column chromatography, and learn to characterize and identify compound structures using modern analytical methods such as nuclear magnetic resonance and infrared spectroscopy. This experiment not only cultivates students' rigorous scientific attitude and research innovation consciousness but also trains their practical research skills. Furthermore, through diversified experimental approaches, it fosters students' teamwork abilities, stimulates their enthusiasm, initiative, and creativity, and enhances their problem-analysis-and-solving capabilities. [ABSTRACT FROM AUTHOR]

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Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this work, a 12-h comprehensive chemical experiment was designed. Based on the synthesis of Keggin-type polyoxometalate (POM) and the oxidation reaction of benzaldehyde in current textbooks, an amphiphilic two-dimensional material, g-C3N4, was introduced to construct a Keggin-type POM@Pickering emulsion microreactor, promoting the efficient oxidation of benzaldehyde and optimally designing the reaction site. Different from the original content, the selection of Keggin-type POM was improved from H3PMo12O40 to K3PW12O40. The unique antioxidant properties of K3PW12O40 can promote the catalytic oxidation reaction. Importantly, the synthesis process of K3PW12O40 is simple, raw materials are environmentally friendly and easy to obtain, and flammable solvents (such as diethyl ether) are not used. The amphiphilic g-C3N4 material with large specific surfaces, the hydrophilic group and conjugated skeleton in its structure, can simultaneously adsorb POM molecules, hydrogen peroxide, and benzaldehyde molecules, promoting the equimolar ratio conversion of hydrogen peroxide and benzaldehyde. The improved experiment is more consistent with the characteristics of “atomic economy” in green chemistry. Moreover, the combination of infrared spectroscopy and thin layer chromatography detection technologies can strengthen the integration of theoretical learning and practical operation. This work embodies the development of outcome based education (OBE) education for the cultivation of creative talents by introducing the frontier research into undergraduate experimental teaching, which is conducive to cultivate innovative consciousness of students and to improve their ability of comprehensive analysis and solving practical problems. [ABSTRACT FROM AUTHOR]

Fluorescent anti-counterfeit printing technology is applied in the special fluorescent printing ink used for logos, which in conjunction with additional light excitation to expose the encrypted information play an anticounterfeiting role. Fluorescent anti-counterfeiting is mostly used in film or solid state; therefore, it is necessary for fluorescent ink to have strong luminescent properties in both states. Aggregation-induced emission (AIE) molecules are a class of molecules that emit weak or even no light in a single molecule state and exhibit strong luminescence in an aggregated state. As a typical AIE molecule with simple synthesis and high fluorescence intensity, the salicylaldehyde Schiff base molecule has a stimulus-responsive fluorescence mechanism. Its different fluorescence characteristics in acid-base environments make this kind of molecule outstanding in the field of anti-counterfeit printing. In this study, the salicylaldehyde Schiff base AIE molecule was prepared by a one-step nucleophilic addition reaction of salicylaldehyde and amine, and its application in anti-counterfeit printing was further demonstrated. Through the characterization of the molecule in different environments, the role of its AIE characteristics and stimulus response fluorescence mechanism in anti-counterfeit printing applications was elucidated. The experimental raw materials are easy to obtain, safe, low cost, and the required instruments are routine, which meets the requirements of laboratory teaching. Through this experimental training, students not only master the preparation method of Schiff base compounds, but also learn the application of stimulus response fluorescence of salicylaldehyde Schiff base molecules in anti-counterfeit printing. The combination of classroom teaching and extended reading, enables students to further understand the characteristics of anti-counterfeit printing products and design concepts. [ABSTRACT FROM AUTHOR]

[Objectives] This experiment was conducted to study the effects of malondialdehyde(MDA)on protein oxidation of soybean meal and the alleviation of tea polyphenols(TP). [Methods] Fresh soybean meal was divided into eight treatment groups, which was treated with 0,0.1,1 and 10 mmol·L-1 MDA, and also treated with 0,0.1,1 and 10 mmol·L-1 MDA and 0.6 mg·mL-1 TP, respectively, and the contents of carbonyl, sulfhydryl, and amino acid in soybean meal were determined. [Results]With the increasing concentration of MDA, the carbonyl content of soybean meal gradually increased(P<0.05),whereas the sulfhydryl and total sulfhydryl groups content, methionine, tyrosine, lysine contents, and in vitro digestibility of soybean meal protein decreased accordingly(P<0.05),the intrinsic fluorescence intensity of tryptophan increased first and then decreased, and its max peak was gradually blue-shifted, accompanied by an increase in the fluorescence intensity of Schiff base. In the oxidative group with the MDA concentration of 1 mmol·L-1, the carbonyl content in soybean meal significantly increased(P<0.05), the contents of sulfhydryl and total sulfhydryl groups significantly decreased(P<0.05),and the in vitro digestibility of soybean meal protein significantly decreased(P<0.01). In the high concentration MDA group (10 mmol·L-1),the carbonyl content in soybean meal significantly increased(P<0.01),and the contents of sulfhydryl and total sulfhydryl, the in vitro digestibility of soybean meal protein significantly decreased(P<0.01). Meanwhile, the methionine, tyrosine, lysine content in soybean meal were remarkably lower than those of the control group(P<0.05). TP addition could mitigate the increase of carbonyl content, the decrease of sulfhydryl and total sulfhydryl groups, the decrease of methionine content, the decrease of in vitro digestibility of soybean meal protein, the decrease of intrinsic fluorescence intensity of tryptophan and the increase of Schiff base content in soybean meal. [Conclusions]1 mmol·L-1MDA can trigger protein oxidation in soybean meal, resulting in a large change in the structure of soybean meal protein and the reduce in vitro digestibility of soybean meal protein. At this time,TP can effectively alleviate the MDA-induced protein oxidation in soybean meal and the reduced in vitro digestibility of soybean meal protein. [ABSTRACT FROM AUTHOR]

Schiff base conductive polymers (TBOT) via a one-step Schiff-base reaction have synthesized by using o-toluidine and homobenzotrialdehyde as reaction monomers. The Schiff-base ferrocene composite electrode material (TBOT-Fc) was also prepared by doping different proportions of ferrocene during the synthesis of Schiff-base conducting polymer. The electrochemical properties of the prepared composites were tested by cyclic voltammetry (CV), constant current charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). The results revealed that the electrochemical performance of TBOT-Fc0.5 was significantly higher than that of TBOT, especially the specific capacitance reached 153.1 mAh/g at the current density of 0.5 A/g. In addition, the constructed asymmetric supercapattery device (TBO-Fc0.5//AC) had a power density of 334.8 W/kg and an energy density of 46.5 Wh/kg at a current density of 0.5 A/g. [ABSTRACT FROM AUTHOR]

In our group, the organic compounds 2,5-dibromoterephthalic acid (H2 L1) and 2,2'-bipyridine (L2) were used as biligands to react with zinc sulfate heptahydrate (ZnSO4 · 7H2O) and cobalt nitrate hexahydrate (Co(NO3)2 ·6H2O), respectively, using solvothermal method to obtain a zinc complex [Zn(L1)(L2) (H2O)]n (1) and a cobalt complex [Co(L1)(L2)(H2 O)]n (2). The structural characterization and properties measurement were performed by single crystal X-ray diffraction, elemental analysis, infrared spectroscopy, ultraviolet spectroscopy, fluorescence spectroscopy, thermogravimetric analysis and other tests. The results show that complex 1 is a monoclinic crystal system with onedimensional chain structure formed by the coordination of Zn2+ linking L12- and L2, each chain forming a three-dimensional network structure by regular stacking under intermolecular hydrogen bonding and π...π conjugation. Complex 2 is a triclinic crystal system with Co1 and Co1i ions linked by carboxylic acid oxygen atoms O4 and O4i on HbL1 to form a bidentate chelated ligand structural unit. A two-dimensional lattice structure is formed with Co2+ ligands connecting L21 and L2, and the layers are regularly stacked under O--H...O intermolecular hydrogen bonding and van der Waals forces to form a three-dimensional network structure. Both complexes 1 and 2 contain aromatic heterocycles, carboxyl heterocycles and nitrogen heterocycles, they have good fluorescence property and thermal stability, the maximum emission wavelengths of complex 1 and complex 2 are 345 nm and 333 nm, respectively. [ABSTRACT FROM AUTHOR]

Formaldehyde has high reactivity and a short detection half-life, and is widely distributed in organisms and the environment. Formaldehyde in the normal concentration range can participate in one-carbon cycle to maintain the body's metabolic homeostasis, and abnormal fluctuations in formaldehyde concentration can induce body lesions to lead to a series of diseases. Real-time measurement of the concentration, duration and location of formaldehyde in living cells and tissues is of great significance for deciphering the physiological or pathological function of formaldehyde and diagnosing and treating formaldehydeinduced diseases. With significant advantages such as high sensitivity, good membrane permeability, real-time in situ analysis, small biological damage, and easy operation, the organic small molecule fluorescent probe is a powerful non-invasive tool that can monitor the concentration and distribution of formaldehyde in cells in real time and space. In recent years, a series of small molecule fluorescent probes have been developed for the detection of formaldehyde in living organisms. In this paper, these fluorescent probes for the visual detection of formaldehyde in organisms are summarized from recognition mechanism and fluorescence opening method these two aspects. The recognition mechanism involve Schiff base reaction, Aza-Corearrangement. And the design and development direction of formaldehyde fluorescent probes are prospected. [ABSTRACT FROM AUTHOR]

The research progress of thiadiazole derivative lubricating oil additives in recent years is reviewed.A series of single thiadiazole lubricating oil additives such as thiadiazole derivative additives with xanthate structure, thiadiazole derivative additives with disulfide bond structure, borate ester（salt） type thiadiazole derivative additives, thiadiazole derivative additives with amide structure, thiadiazole Schiff base additives, thiadiazole derivative additives with ester or ether structure are mainly introduced.In addition, the composite lubricant additives of nanoparticles and thiadiazole derivatives are also introduced, which can significantly improve the friction performance of lubricating base oil.The prospect of preparing oleic acid type thiadiazole derivative lubricating oil additive, thiadiazole type ionic liquid lubricating oil additive and thiadiazole nanoparticle lubricating oil additive was put forward. [ABSTRACT FROM AUTHOR]

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Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Chondroitin sulfate (ChS), a kind of natural polysaccharide, is the sulfated glycosaminoglycan which is widely distributed in the extracellular matrix and on the surface of animal cells. ChS possesses various biological activities, such as promoting cartilage growth, regulating growth factors and accelerating wound healing. As a novel biomaterial, in recent years, ChS-based injectable hydrogels have attracted much attention due to their biocompatibility, biodegradability combined with their unique bioactivity, particularly, their applications in the fields of tissue engineering, drug delivery, cell therapy and so on. The gelation systems gelation mechanisms and modification methods of ChS-based injectable hydrogels are reviewed. Herein, the formation methods of the three dimensional network structure in ChS-based injectable hydrogels are mainly introduced, involving physical thermo-induced gelation, chemical crosslinking through Schiff ’s base formation, click chemical reaction, formation of amide bonds and photo-crosslinking and enzyme-catalyzed crosslinking, etc. These developed precursor polymer systems, the corresponding crosslinking methods and mechanisms have been illustrated in detail. In addition, the methods about regulating gelation time, mechanical properties and tissue adhesion are also discussed. The reported strategies can be summarized as the combination of two or more crosslinking methods, adjusting the constitute of the gelation systems and forming composite hydrogels, etc. Finally, future development of ChS-based injectable hydrogels as biomaterials is prospected. We propose that more feasible injectable hydrogel systems with suitable properties will be developed in the future. Furthermore, the relationships among the chemical structure of ChS, the gelation behavior and biological functions should be studied further. In addition, because of the excellent bioactivity of ChS, ChS-based injectable hydrogels applied in other biomedical fields should be explored. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Magnetic Fe3O4 nano-particles were prepared by chemical coprecipitation method, and magnetic chitosan microspheres (Fe3O4@CS) and polyethyleneimine (PEI) modified magnetic chitosan microspheres (Fe3O4@CS/PEI) with different proportions were thereby prepared by Schiff base reaction in the emulsion system using glutaraldehyde as the crosslinking agent. The structure, particle size and magnetism of microspheres were characterized by infrared spectroscopy (FT-IR), X-ray powder diffraction(XRD), scanning electron microscope (SEM), dynamic laser scatter (DLS) and hysteresis loop. The adsorption amount of ibuprofen on microspheres and reuse rate were studied by ultraviolet spectrophotometer. The characterization results showed that the microspheres were successfully prepared by Schiff base reaction, which had no effect on the crystal phase of Fe3O4. The microspheres presented regular circle with narrow size distribution and they were magnetic. The thermodynamics adsorption model of ibuprofen on microspheres was Langmuir adsorption isotherm, and the kinetic adsorption model was second order dynamics model. With the increase of PEI mass fraction, the adsorption amount of ibuprofen on microspheres were increased. When m(PEI)∶m(CS)=1∶1, the maximum adsorption amount of ibuprofen on CP-3 (Fe3O4@CS/PEI) was determined to be 138.63 mg/g by the Langmuir adsorption equation fitting, which was twice higher than that on CP-0(Fe3O4@CS). After repeating adsorption experiments for 5 times, the microspheres still showed good adsorption performance for ibuprofen. [ABSTRACT FROM AUTHOR]

Five kinds of Schiff base ligands were synthesized by salicylaldehyde and its derivatives, ethylenediamine and o-phenylenediamine. Then Salen Co(H) complexes were synthesized with ligands L1 -L5 and Co(N03)2. Ligands L1 -L5 were characterized by ¹H NMR, and metal complexes C1-C5 were characterized by IR spectroscopy. After that, the molar oxygen absorptions of five metal complexes were measured, and the oxygen-carrying capacity and its structureproperty relationship were analyzed. The research results show that the best ratio of the salicylaldehyde to ethylenediamine is 2: 1,the solvent dosage is 40. 0 mL,the reaction temperature is 80 °C, and the reaction time is 2.5 h. The Schiff base ligand Lx has the highest yield of 81. 4%. Five kinds of complexes were synthesized under the conditions of a ratio of ligand to cobalt nitrate 1.5,a solvent dosage 60. 0 mL,a reaction temperature 80 °C, and a reaction time 3 h, and the yields were all above 80%. The molar oxygen absorption of five metal complexes from high to low is C5 > C2 > C1>C4>C3, which is related to the electronic effect and steric effect of substituent in ligand, and the degree of conjugation. The electron cloud density of the ligand is larger, the degree of conjugation is higher, and the oxygen carrying capacity is larger. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Combined with the research focus of new materials in recent years, this paper explored the comprehensive basic chemistry experiment "electrochemical redox research of Schiff bases" from the viewpoint of reduction potentials. Through this proposed comprehensive experiment, students could master the preparation method and characterization technology of organic compounds, working principle and operation skills of infrared, ultraviolet spectrometer and nuclear magnetic resonance instrument, as well as many knowledge points and experimental skills such as spectral analysis method, data analysis method and origin mapping technique. This experiment includes the experimental contents that require students to conduct autonomous research, and it also reflects the integration and intersection of knowledge of multiple chemistry disciplines. It greatly improves students'initiative of independent learning and innovative thinking ability, achieves the goal of cultivating students'comprehensive ability and quality, and improves the teaching quality of experiment. Moreover, the project has the advantages of low cost, low requirements for experimental equipment and conditions, and high universality. Thus, it can provide reference for the comprehensive chemistry teaching experiments in other universities. [ABSTRACT FROM AUTHOR]

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Copyright of Imaging Science & Photochemistry is the property of Imaging Science & Photochemistry Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A new compound has been synthesized and characterized by ¹H NMR,IR and MS. The interaction between 4,5-dimethyl-3-cyano-2-furan amine salicylaldehyde Schiff base and Bovine Serum Albumin was investigated by fluorescence spectrometry and ultraviolet spectroscopy at different temperatures. The experimental results showed that the fluorescence quenching of BSA by FSS was a result of the formation of the FSS-BSA complex and dynamic quenching occurred in the fluorescence quenching. The binding sites number n, apparent corporation constant K and corresponding thermodynamic parameters ΔH, ΔG, ΔS were calculated. The research results indicated that FSS bound BSA with molar ratio of 1:1 and the binding reaction was mainly entropy-driven and hydrophobic interactions forces played major role in the reaction. The effect of FSS on the conformation of BSA was analyzed using synchronous fluorescence spectrocopy. [ABSTRACT FROM AUTHOR]

To explore novel coumarin derivatives with more potent anti-proliferative activity, a series of novel compounds were designed and synthesized by linking Schiff base and N, N-bis (2-chloroethyl) amine pharmacophore of nitrogen mustards to the coumarin's framework. Their structures were confirmed by 1H NMR, MS and element analysis techniques. In vitro anti-proliferative activities were evaluated against HepG2, DU145 and MCF7 cell lines by the standard MTT assay. The results showed that some of the target compounds exhibited strong anti-proliferative activities against selected tumor cells, and compounds 7c, 7f, 7g, 7h and 7q were better than or equal to the activities of positive control, they deserved further development.

Using Ce, La, Nd (III) nitrate and a curcumin aniline schiff base and a curcumin bis (4-methyl aniline) schiff base as raw materials, six complexes were synthesized. Through the molar conductance, IR, TG-DTA and element analysis motheds, the structures of complexes were characterized. Moreover, the properties of UV-Visible spectra and photochromic properties of the complex, and the solvatechromic performance in organic solvents were explored. The experiments showed that the complexes have good photochromic and solvate-chromic properties. The fluorescence intensity and UV-Visible spectra intensity were reduced under exposure,and the color of the complex solution became light. The complexes have different UV-Visible spectra in difference organic solvents. The relationship between photochromic properties and time was also studied.

Two novel bis-schiff base complexes [UO2 (PMTHP)2en] and [Th(PMTHP)2en(NO3)2] have been synthesized, where (PMTHP)2en = N,N'-bis[(1-phenyl-3-methyl-5-oxo-5-pyrazolinyl)- 2-thenoylmethylidyne] ethylenediamine, and characterized by elemental analysis, IR, UV-Vis, 1H NMR, 13C NMR and molar conductance measurements. The results show that the bis-schiff base is a quadridentate ligand and the nitrate a bidentate ligand, and the uranyl and thorium ions exhibit coordination of six and eight in the complexes, respectively.