Two new water-soluble binuclear copper(II)chelates derived from the condensationof 2,6-diformyl-4-methylphenol with glycylglycine were characterized with spectral.magnetic and electrochemical techniques.
The thermal decomposition kinetics of urushiol-Cu, urushiol-Nd and urushiol-Ti chelatepolymers has been studied by non-isothermal thermogravimetry. The results suggest that thethermal decomposition kinetics of three c...The thermal decomposition kinetics of urushiol-Cu, urushiol-Nd and urushiol-Ti chelatepolymers has been studied by non-isothermal thermogravimetry. The results suggest that thethermal decomposition kinetics of three chelate polymers are all of first order. Their averageactivation energy values of the thermal decomposition calculated by Ozawa-（I） method are 110,79, 136. 98 and 163. 64 kJ mol<sup>-1</sup> respectively, which increase linearly with the metal valence of themetal chelate展开更多
The objective of the study was to compare the effect of feeding mixed chelated minerals (Mn, Cu and Zn) methionine on dairy cow productive performance and milk yield and its components. The trial was conducted with da...The objective of the study was to compare the effect of feeding mixed chelated minerals (Mn, Cu and Zn) methionine on dairy cow productive performance and milk yield and its components. The trial was conducted with dairy cows across various stage of lactation. The experimental treatments include chelated minerals (15 mg Zn as Zn Met, 20 mg Mn as Mn Met, 10 mg Cu as Cu Met). Inorganic mixture contains (15 mg Zn as ZnSO4, 20 mg Mn as MnSO4, 10 mg Cu as CuSO4) in sulphate forms. The experiment was commenced in the dry period of cows, 6 weeks before calving, and after calving the first three months of lactation was taken into consideration. Milk samples were collected from each cow evening and morning for estimation of milk yield production. The inorganic metals caused a significant decline (P < 0.05) in digestibility coefficients, nutritive value, nitrogen utilization, Cell wall constituents, total VFA’s, rumen volume, microbial and nitrogen synthesis compared to the organic metals. The treated group (chelated minerals) improved the milk yield, and the milk fat percentage of animals across various stages of lactation as compared to inorganic minerals treated group of animals, and no significant differences were observed among groups concerning the entire blood constituent.展开更多
New mixed ligand chelates synthesized from di-and trivalent metal ions (Cr, Co, Ni, and Cu ions) and Schiff base (L1) resulted from the condensation of 4-dimethylaminobenzaldehyde with 2-aminophenol as primary ligand,...New mixed ligand chelates synthesized from di-and trivalent metal ions (Cr, Co, Ni, and Cu ions) and Schiff base (L1) resulted from the condensation of 4-dimethylaminobenzaldehyde with 2-aminophenol as primary ligand, whereas 2-nitroaniline (L2) represents the secondary ligand in a molar ratio of M:L1:L2 [1:1:1]. The synthesized Schiff base and chelates have been characterized by using several tools, such as, elemental analysis, molar conductivity, magnetic moment measurements, infrared and electronic spectra. The mass spectra of the ligands and Ni(II) chelate were used to justify the process of modification, as well as, the electron paramagnetic resonance spectrum which was carried out for Cu(II) chelate all in order to elucidate the chemical and geometrical structure of the chelates. On the basis of the obtained data, the geometry of the products was proposed for all the chelates.展开更多
A fluoroimmunoassay method using unlabeled Terbium chelate isdescribed.The principle is similar to that of fluoroimmunoassay method usinglanthanide chelate as labels.The procedure is simpte because labeling processis ...A fluoroimmunoassay method using unlabeled Terbium chelate isdescribed.The principle is similar to that of fluoroimmunoassay method usinglanthanide chelate as labels.The procedure is simpte because labeling processis unnecessary.The recovery of HSA and albumin in urine is 107% and95% respectively.The standard deviation is tess than 10%.展开更多
A fluoroimmunoassay method using unlabeled europium chelate isdescribed.The principle is similar to that of fluoroimmunoassay methodusing lanthanide chelate as labels.The procedure is simple becauselabeling process is...A fluoroimmunoassay method using unlabeled europium chelate isdescribed.The principle is similar to that of fluoroimmunoassay methodusing lanthanide chelate as labels.The procedure is simple becauselabeling process is omitted.The detection limit is about 10<sup>10</sup> mol/Lantigen.The relative standard deviation of immunoassay is less than10%.The recoveries of human serum albumin and estradiol protein conjugateare 96-105% and 111% respectively.展开更多
A europium chelate of 5-chlorosulfoyl-2-thenoyltrifluoroacetone(CTTA)was investigated for precolumn derivatization ofprotein for high performance liquid chromatography.This new label was highlyfluorescent and suitable...A europium chelate of 5-chlorosulfoyl-2-thenoyltrifluoroacetone(CTTA)was investigated for precolumn derivatization ofprotein for high performance liquid chromatography.This new label was highlyfluorescent and suitable for time-resolved fluorometric detection.Thedetective limit of protein is less than 0.3ug in sample with a volume of100ul.Theoretically,the new label can also be used in gel electrophoresisand protein blotting.展开更多
A new type of binuclear europlum β-diketone chelates Eum Y1-m(TTA)3 phen (0≤m≤1) and the influence of the proportion of Y on fluorescence intensity of the Eu-complexes were studied. It was found the proportion of Y...A new type of binuclear europlum β-diketone chelates Eum Y1-m(TTA)3 phen (0≤m≤1) and the influence of the proportion of Y on fluorescence intensity of the Eu-complexes were studied. It was found the proportion of Y3+ could affect the fluorescence properties and the film formation seriously. only m≥0.5.Y3+ could increase the luminescent intensity and improve the film formalion. As a resull. three new binuclear europium β-diketone chelales consisted of Eu, Y1-m (TTA)3phen (m=0.9. 0.7 and 0.5) were designed and synthesized. Their structures were elucidated by IR. UV. DSC and Elementary Analysis. Their PL properties were studied. The results showed that the three binuclear europium β-diketone chelates had better PL properties and film formation than Eu(TYA)3phen. They could emit sharply red light, and fluorescenl wavelength of them was all at 613nm (half bandwidth 10nm). They can be used as red organic electroluminescent materials (OELMs) in organic electrolminescent devices (OELDS).展开更多
A new type of palladium chelate of β-diketone-based side chain liquid crystal polysiloxane （Pd-DKLCP） has been synthesized by chelation reaction of palladium dichloride with polymeric ligand, β-diketone polysiloxa...A new type of palladium chelate of β-diketone-based side chain liquid crystal polysiloxane （Pd-DKLCP） has been synthesized by chelation reaction of palladium dichloride with polymeric ligand, β-diketone polysiloxane （DKLCP）, using THF as solvent at R.T.. The Pd-chelation results in greatly increasing the phase transition temperature T<sub>K</sub> and the enthalpy change △H<sub>K</sub> from crystal to liquid crystal state and making the temperature range of LC state △T(△T=T<sub>Cl</sub>-T<sub>K</sub>) widened. All these chelates Pd-DKLCP’s do not show T<sub>Cl</sub> until decomposition at 205℃. It is noteworthy that the Pd-chelation can exert more positive effect on the mesomorphic behaviour of the polymer ligand than the counterpart Cu-DKLCP does. It is probable due to the bigger size of disc-like mesogen formed from β-diketone and Pd<sup>+2</sup> ion with 4d orbital.展开更多
A novel spherical macroporous epoxy-dicyandiamide chelate resin was synthesized simply and rapidly from epoxy resin and used for the preconcentration and separation of trace amounts of Au( Ⅲ ), Hg (Ⅱ ), Pd ( Ⅳ ) an...A novel spherical macroporous epoxy-dicyandiamide chelate resin was synthesized simply and rapidly from epoxy resin and used for the preconcentration and separation of trace amounts of Au( Ⅲ ), Hg (Ⅱ ), Pd ( Ⅳ ) and Ru ( Ⅲ ) ions from solution samples. The analyzed ions can be quantitatively concentrated by the resin at a flow rate of 2.0 mL/min at pH 4, and can also be desorbed with 15 mL of 4 mol/L HCl+0.3 g thiourea from the resin column with recoveries of 96.5%-99.0%. After the chelate resin was reused for 7 times, the recoveries of these ions were still over 92%, and 400-1 000 times of excess of Fe( Ⅲ ), Al( Ⅲ ), Ni( Ⅱ ), Mn( Ⅱ ), Cr ( Ⅲ ), Cu ( Ⅱ ), Cd ( Ⅱ ) and Pb( Ⅱ ) caused little interference with the determination of these ions by an inductively coupled plasma optical emission spectrometer (ICP-OES). The capacities of the resin for the analytes are in the range of 0.35～0.92 mmol/g. The RSDs of the proposed method are in the range of 1.1%～4.0% for each kind of the analyzed ions. The recoveries of a standard added in real solution samples are between 96.5 % and 98. 5 %, and the results for the analyzed ions in a powder sample are in good agreement with their reported values.展开更多
A blending chelate filter membrane with high chelate capacity for Ag + has been prepared by blending of phosphoramidic acid resin and polysulfone. The major parameters influencing structure of the chelate filter membr...A blending chelate filter membrane with high chelate capacity for Ag + has been prepared by blending of phosphoramidic acid resin and polysulfone. The major parameters influencing structure of the chelate filter membranes such as the blending ratio, phosphoramidic acid resin grain size and temperature of casting solution have been studied. The relationship among the chelate amount of Ag +, pH value, Ag + concentration and phosphoramidic acid resin grain diameter were examined. The chelate filter membrane had a capacity of 1 438 μg/cm 2 for Ag + under appropriate conditions. Sorption isotherm of Ag + could be expressed with the Freundlich sorption model. The dynamic chelate experiments proved that the sorption and desorption of membranes could be realized simultaneously for Ag +.展开更多
The kinetic behavior of forming the iso-nuclear β-type chelates of rare earth ions (RE^3+) with p-sulphoaminobromophosphonazo (BPA-pSN) in ClCH2COOH-CH3COONa buffer solutions were studied by a spectrophotometric method.
Pure greenish-blue cobalt chromite(Co Cr/_2O_4) nanoparticles with narrow particle range of 4.1±1.9nm and surface area of 78.2 m2·g-1were synthesized through mixed chelates thermolysis of corresponding metal...Pure greenish-blue cobalt chromite(Co Cr/_2O_4) nanoparticles with narrow particle range of 4.1±1.9nm and surface area of 78.2 m2·g-1were synthesized through mixed chelates thermolysis of corresponding metals using 2-Mercaptopyridine N-oxide sodium salt as chelating agent. During the thermolysis procedure,high amount of gases were emitted that led to the formation of nanoparticles with high surface area. The product was characterized by TGA, DTG, XRD, TEM, SEM, LLS, BET and chemical analysis. Design of experiments was performed to fulfill the two levels L_4 Taguchi design. It was found that the temperature and time of thermolysis process have significant effect on the particle size reduction. The Oxidation of trichloroethylene was carried out over Co Cr_2O_4 nanocrystallite. Catalytic activity analysis revealed that the synthesis Co Cr_2O_4 possesses high catalytic activity for this process.展开更多
In order to reduce the non-point source pollution caused by the large or excessive application of chemical fertilizers and pesticides,this study was aimed to develop new alternative functional substances.The effects o...In order to reduce the non-point source pollution caused by the large or excessive application of chemical fertilizers and pesticides,this study was aimed to develop new alternative functional substances.The effects of different concentrations of indolebutyric acid-lanthanum chelate on seed germination and tomato seedling growth were studied by germination test of cucumber and tomato seeds and pot experiment of tomato seedlings.The results showed that the optimum concentration of indolebutyric acid-lanthanum chelate could promote the germination and growth of tomato and cucumber seeds.Among them,0.02 mg/L of indolebutyric acid-lanthanum chelate is the optimum concentration for tomato and cucumber seed germination.When the concentration is 0.1 mg/L,it is the optimum concentration for radicle and hypocotyl growth.In the pot experiment,when the optimum concentration of indolebutyric acid-lanthanum chelate on tomato seedlings was 0.5 mg/L,the plant height,stem diameter,aboveground biomass,underground biomass and leaf area of tomato seedlings could be significantly promoted.At the same time,the absorption of the main elements P,K,Mg and trace elements Fe,Mn,Cu,Zn and Na and their transfer from the underground part to the aboveground part of the seedlings were enhanced.The relative expression of the tomato expansion protein genes leEXP2,leEXP18 and leEXP5 was also significantly increased.Therefore,the suitable concentration of indolebutyric acid-lanthanum chelate has the effect of promoting root growth and promoting the quality of tomato seedlings.展开更多
The reaction behavior of forming the hetero-nuclear β-type chelates of rare earth ions （RE 3+） with p-sulphoaminobromophosphonazo（BPA-pSN） in ClCH2COOH-CH3COONa buffer solutions were studied by a spectrophotometr...The reaction behavior of forming the hetero-nuclear β-type chelates of rare earth ions （RE 3+） with p-sulphoaminobromophosphonazo（BPA-pSN） in ClCH2COOH-CH3COONa buffer solutions were studied by a spectrophotometric method. The interaction of RE 3+ with BPA-pSN, which can forms hetero-nuclear β-type chelates having composition ratio of RE1 （light rare earth）:BPA-pSN:RE2（heavy rare earth ion）=1∶3∶1, is a first-order reaction. Meanwhile, BPA-pSN can only forms homo-nuclear β-type chelates with heavy rare earth ions, having a composition ratio of RE∶BPA-pSN=1∶2 and being a second-order reaction. The rate constants of forming homo-and hetero-nuclear β-type chelates were obtained and the mechanism of forming hetero-nuclear β-type chelates was proposed.展开更多
The synthetic method and structural characteristics of urushiol-titanium chelates (UT) and urushiol-titanium chelate polymer for anticorrosive coatings have been studied.Two kinds of coating films made from UT polymer...The synthetic method and structural characteristics of urushiol-titanium chelates (UT) and urushiol-titanium chelate polymer for anticorrosive coatings have been studied.Two kinds of coating films made from UT polymer show excellent physico-mechanical properties and possess good chemical resistance to strong acids and alkalis, many kinds of salt solutions and organic solvents, stable at high temperature.展开更多
The title of this little assay coins three new words: Pre-Chelates, Post-Adducts and Implexes. These, very daring new excursions into the scientific English language, come from the developments of Quelamycin and Sodiu...The title of this little assay coins three new words: Pre-Chelates, Post-Adducts and Implexes. These, very daring new excursions into the scientific English language, come from the developments of Quelamycin and Sodium L-Thioproline, through our different group studies arriving to cancer reversal by a dual strategy. It is enough to read all our published materials, cites and related papers, dealing more or less with the chemistry and possible mechanism of action of these compounds, to gather somewhat what signified our monomeric-triferric-doxorubicine, as possibly one of the first Pre-Chelates and our Sodium L-Thioproline, probably as one of the first Post-Adducts. Both molecules come to the human patients with cancer blood from the exterior. After this indication, it will be proposed a seed concept of a new type of molecules, the “Implexes” in which the metals will be embraced instead of being linked.展开更多
[Objective]The paper was to study effects of small peptide chelated trace elements(copper,iron,zinc and manganese)on growth performance,chicken quality and antioxidant capacity of rapid yellow feather broilers.[Method...[Objective]The paper was to study effects of small peptide chelated trace elements(copper,iron,zinc and manganese)on growth performance,chicken quality and antioxidant capacity of rapid yellow feather broilers.[Method]Three hundred one-day-old yellow feather broilers with similar body weight were selected and randomly divided into three treatments:inorganic trace element group(basal diet+inorganic trace elements),organic trace element group(basal diet+small peptide chelated trace elements)and compound group(basal diet+50%inorganic trace elements+50%small peptide chelated trace elements).There were 10 replicates per treatment and 10 chickens per replicate.The trial lasted for 63 d.[Result]①Compared to inorganic trace element group,average daily gain(ADG)of yellow feather broilers in organic trace element group was significantly increased over the whole period(P<0.05).②There was no significant difference in slaughter performance and immune organ indices among the three test groups(P>0.05).③There was no significant difference in breast muscle pH,chicken color,drip loss,and shear force among the three groups(P>0.05),but cooking loss of chicken breast in inorganic trace element group was 27.46%and 22.53%higher than those in organic trace element group and compound group,respectively(P<0.05).④MDA content in serum in organic trace element group was 15.61%lower than that in inorganic trace element group(P<0.05).[Conclusion]Complete substitution of inorganic copper,iron,zinc and manganese by small peptide chelated copper,iron,zinc,and manganese significantly increases ADG of broilers,improves quality of chicken breast,and enhances antioxidant capacity.展开更多
文摘Two new water-soluble binuclear copper(II)chelates derived from the condensationof 2,6-diformyl-4-methylphenol with glycylglycine were characterized with spectral.magnetic and electrochemical techniques.
基金This work is supported by the National Natural Science Foundation of China
文摘The thermal decomposition kinetics of urushiol-Cu, urushiol-Nd and urushiol-Ti chelatepolymers has been studied by non-isothermal thermogravimetry. The results suggest that thethermal decomposition kinetics of three chelate polymers are all of first order. Their averageactivation energy values of the thermal decomposition calculated by Ozawa-（I） method are 110,79, 136. 98 and 163. 64 kJ mol<sup>-1</sup> respectively, which increase linearly with the metal valence of themetal chelate
文摘The objective of the study was to compare the effect of feeding mixed chelated minerals (Mn, Cu and Zn) methionine on dairy cow productive performance and milk yield and its components. The trial was conducted with dairy cows across various stage of lactation. The experimental treatments include chelated minerals (15 mg Zn as Zn Met, 20 mg Mn as Mn Met, 10 mg Cu as Cu Met). Inorganic mixture contains (15 mg Zn as ZnSO4, 20 mg Mn as MnSO4, 10 mg Cu as CuSO4) in sulphate forms. The experiment was commenced in the dry period of cows, 6 weeks before calving, and after calving the first three months of lactation was taken into consideration. Milk samples were collected from each cow evening and morning for estimation of milk yield production. The inorganic metals caused a significant decline (P < 0.05) in digestibility coefficients, nutritive value, nitrogen utilization, Cell wall constituents, total VFA’s, rumen volume, microbial and nitrogen synthesis compared to the organic metals. The treated group (chelated minerals) improved the milk yield, and the milk fat percentage of animals across various stages of lactation as compared to inorganic minerals treated group of animals, and no significant differences were observed among groups concerning the entire blood constituent.
文摘New mixed ligand chelates synthesized from di-and trivalent metal ions (Cr, Co, Ni, and Cu ions) and Schiff base (L1) resulted from the condensation of 4-dimethylaminobenzaldehyde with 2-aminophenol as primary ligand, whereas 2-nitroaniline (L2) represents the secondary ligand in a molar ratio of M:L1:L2 [1:1:1]. The synthesized Schiff base and chelates have been characterized by using several tools, such as, elemental analysis, molar conductivity, magnetic moment measurements, infrared and electronic spectra. The mass spectra of the ligands and Ni(II) chelate were used to justify the process of modification, as well as, the electron paramagnetic resonance spectrum which was carried out for Cu(II) chelate all in order to elucidate the chemical and geometrical structure of the chelates. On the basis of the obtained data, the geometry of the products was proposed for all the chelates.
基金supported by National Commission of Natural Science Foundation of China.
文摘A fluoroimmunoassay method using unlabeled Terbium chelate isdescribed.The principle is similar to that of fluoroimmunoassay method usinglanthanide chelate as labels.The procedure is simpte because labeling processis unnecessary.The recovery of HSA and albumin in urine is 107% and95% respectively.The standard deviation is tess than 10%.
基金This work was supported by National Natural Science Foundation of China.
文摘A fluoroimmunoassay method using unlabeled europium chelate isdescribed.The principle is similar to that of fluoroimmunoassay methodusing lanthanide chelate as labels.The procedure is simple becauselabeling process is omitted.The detection limit is about 10<sup>10</sup> mol/Lantigen.The relative standard deviation of immunoassay is less than10%.The recoveries of human serum albumin and estradiol protein conjugateare 96-105% and 111% respectively.
文摘A europium chelate of 5-chlorosulfoyl-2-thenoyltrifluoroacetone(CTTA)was investigated for precolumn derivatization ofprotein for high performance liquid chromatography.This new label was highlyfluorescent and suitable for time-resolved fluorometric detection.Thedetective limit of protein is less than 0.3ug in sample with a volume of100ul.Theoretically,the new label can also be used in gel electrophoresisand protein blotting.
文摘A new type of binuclear europlum β-diketone chelates Eum Y1-m(TTA)3 phen (0≤m≤1) and the influence of the proportion of Y on fluorescence intensity of the Eu-complexes were studied. It was found the proportion of Y3+ could affect the fluorescence properties and the film formation seriously. only m≥0.5.Y3+ could increase the luminescent intensity and improve the film formalion. As a resull. three new binuclear europium β-diketone chelales consisted of Eu, Y1-m (TTA)3phen (m=0.9. 0.7 and 0.5) were designed and synthesized. Their structures were elucidated by IR. UV. DSC and Elementary Analysis. Their PL properties were studied. The results showed that the three binuclear europium β-diketone chelates had better PL properties and film formation than Eu(TYA)3phen. They could emit sharply red light, and fluorescenl wavelength of them was all at 613nm (half bandwidth 10nm). They can be used as red organic electroluminescent materials (OELMs) in organic electrolminescent devices (OELDS).
文摘A new type of palladium chelate of β-diketone-based side chain liquid crystal polysiloxane （Pd-DKLCP） has been synthesized by chelation reaction of palladium dichloride with polymeric ligand, β-diketone polysiloxane （DKLCP）, using THF as solvent at R.T.. The Pd-chelation results in greatly increasing the phase transition temperature T<sub>K</sub> and the enthalpy change △H<sub>K</sub> from crystal to liquid crystal state and making the temperature range of LC state △T(△T=T<sub>Cl</sub>-T<sub>K</sub>) widened. All these chelates Pd-DKLCP’s do not show T<sub>Cl</sub> until decomposition at 205℃. It is noteworthy that the Pd-chelation can exert more positive effect on the mesomorphic behaviour of the polymer ligand than the counterpart Cu-DKLCP does. It is probable due to the bigger size of disc-like mesogen formed from β-diketone and Pd<sup>+2</sup> ion with 4d orbital.
基金the Natural Science Foundation and Science Committee Foundation of Ningxia.
文摘A novel spherical macroporous epoxy-dicyandiamide chelate resin was synthesized simply and rapidly from epoxy resin and used for the preconcentration and separation of trace amounts of Au( Ⅲ ), Hg (Ⅱ ), Pd ( Ⅳ ) and Ru ( Ⅲ ) ions from solution samples. The analyzed ions can be quantitatively concentrated by the resin at a flow rate of 2.0 mL/min at pH 4, and can also be desorbed with 15 mL of 4 mol/L HCl+0.3 g thiourea from the resin column with recoveries of 96.5%-99.0%. After the chelate resin was reused for 7 times, the recoveries of these ions were still over 92%, and 400-1 000 times of excess of Fe( Ⅲ ), Al( Ⅲ ), Ni( Ⅱ ), Mn( Ⅱ ), Cr ( Ⅲ ), Cu ( Ⅱ ), Cd ( Ⅱ ) and Pb( Ⅱ ) caused little interference with the determination of these ions by an inductively coupled plasma optical emission spectrometer (ICP-OES). The capacities of the resin for the analytes are in the range of 0.35～0.92 mmol/g. The RSDs of the proposed method are in the range of 1.1%～4.0% for each kind of the analyzed ions. The recoveries of a standard added in real solution samples are between 96.5 % and 98. 5 %, and the results for the analyzed ions in a powder sample are in good agreement with their reported values.
文摘A blending chelate filter membrane with high chelate capacity for Ag + has been prepared by blending of phosphoramidic acid resin and polysulfone. The major parameters influencing structure of the chelate filter membranes such as the blending ratio, phosphoramidic acid resin grain size and temperature of casting solution have been studied. The relationship among the chelate amount of Ag +, pH value, Ag + concentration and phosphoramidic acid resin grain diameter were examined. The chelate filter membrane had a capacity of 1 438 μg/cm 2 for Ag + under appropriate conditions. Sorption isotherm of Ag + could be expressed with the Freundlich sorption model. The dynamic chelate experiments proved that the sorption and desorption of membranes could be realized simultaneously for Ag +.
基金a grant from the Educational Commission of Gansu Province.
文摘The kinetic behavior of forming the iso-nuclear β-type chelates of rare earth ions (RE^3+) with p-sulphoaminobromophosphonazo (BPA-pSN) in ClCH2COOH-CH3COONa buffer solutions were studied by a spectrophotometric method.
文摘Pure greenish-blue cobalt chromite(Co Cr/_2O_4) nanoparticles with narrow particle range of 4.1±1.9nm and surface area of 78.2 m2·g-1were synthesized through mixed chelates thermolysis of corresponding metals using 2-Mercaptopyridine N-oxide sodium salt as chelating agent. During the thermolysis procedure,high amount of gases were emitted that led to the formation of nanoparticles with high surface area. The product was characterized by TGA, DTG, XRD, TEM, SEM, LLS, BET and chemical analysis. Design of experiments was performed to fulfill the two levels L_4 Taguchi design. It was found that the temperature and time of thermolysis process have significant effect on the particle size reduction. The Oxidation of trichloroethylene was carried out over Co Cr_2O_4 nanocrystallite. Catalytic activity analysis revealed that the synthesis Co Cr_2O_4 possesses high catalytic activity for this process.
基金This work was supported by the“13th Five-Year Plan”National Key Research and Development Project.The authors wish to thank Chen Qin,Hu Lin and Cui Jianyu for helpful discussion and advice on the manuscript.
文摘In order to reduce the non-point source pollution caused by the large or excessive application of chemical fertilizers and pesticides,this study was aimed to develop new alternative functional substances.The effects of different concentrations of indolebutyric acid-lanthanum chelate on seed germination and tomato seedling growth were studied by germination test of cucumber and tomato seeds and pot experiment of tomato seedlings.The results showed that the optimum concentration of indolebutyric acid-lanthanum chelate could promote the germination and growth of tomato and cucumber seeds.Among them,0.02 mg/L of indolebutyric acid-lanthanum chelate is the optimum concentration for tomato and cucumber seed germination.When the concentration is 0.1 mg/L,it is the optimum concentration for radicle and hypocotyl growth.In the pot experiment,when the optimum concentration of indolebutyric acid-lanthanum chelate on tomato seedlings was 0.5 mg/L,the plant height,stem diameter,aboveground biomass,underground biomass and leaf area of tomato seedlings could be significantly promoted.At the same time,the absorption of the main elements P,K,Mg and trace elements Fe,Mn,Cu,Zn and Na and their transfer from the underground part to the aboveground part of the seedlings were enhanced.The relative expression of the tomato expansion protein genes leEXP2,leEXP18 and leEXP5 was also significantly increased.Therefore,the suitable concentration of indolebutyric acid-lanthanum chelate has the effect of promoting root growth and promoting the quality of tomato seedlings.
文摘The reaction behavior of forming the hetero-nuclear β-type chelates of rare earth ions （RE 3+） with p-sulphoaminobromophosphonazo（BPA-pSN） in ClCH2COOH-CH3COONa buffer solutions were studied by a spectrophotometric method. The interaction of RE 3+ with BPA-pSN, which can forms hetero-nuclear β-type chelates having composition ratio of RE1 （light rare earth）:BPA-pSN:RE2（heavy rare earth ion）=1∶3∶1, is a first-order reaction. Meanwhile, BPA-pSN can only forms homo-nuclear β-type chelates with heavy rare earth ions, having a composition ratio of RE∶BPA-pSN=1∶2 and being a second-order reaction. The rate constants of forming homo-and hetero-nuclear β-type chelates were obtained and the mechanism of forming hetero-nuclear β-type chelates was proposed.
基金This work is supported by the National Natural Science Foundation of China
文摘The synthetic method and structural characteristics of urushiol-titanium chelates (UT) and urushiol-titanium chelate polymer for anticorrosive coatings have been studied.Two kinds of coating films made from UT polymer show excellent physico-mechanical properties and possess good chemical resistance to strong acids and alkalis, many kinds of salt solutions and organic solvents, stable at high temperature.
文摘The title of this little assay coins three new words: Pre-Chelates, Post-Adducts and Implexes. These, very daring new excursions into the scientific English language, come from the developments of Quelamycin and Sodium L-Thioproline, through our different group studies arriving to cancer reversal by a dual strategy. It is enough to read all our published materials, cites and related papers, dealing more or less with the chemistry and possible mechanism of action of these compounds, to gather somewhat what signified our monomeric-triferric-doxorubicine, as possibly one of the first Pre-Chelates and our Sodium L-Thioproline, probably as one of the first Post-Adducts. Both molecules come to the human patients with cancer blood from the exterior. After this indication, it will be proposed a seed concept of a new type of molecules, the “Implexes” in which the metals will be embraced instead of being linked.
文摘[Objective]The paper was to study effects of small peptide chelated trace elements(copper,iron,zinc and manganese)on growth performance,chicken quality and antioxidant capacity of rapid yellow feather broilers.[Method]Three hundred one-day-old yellow feather broilers with similar body weight were selected and randomly divided into three treatments:inorganic trace element group(basal diet+inorganic trace elements),organic trace element group(basal diet+small peptide chelated trace elements)and compound group(basal diet+50%inorganic trace elements+50%small peptide chelated trace elements).There were 10 replicates per treatment and 10 chickens per replicate.The trial lasted for 63 d.[Result]①Compared to inorganic trace element group,average daily gain(ADG)of yellow feather broilers in organic trace element group was significantly increased over the whole period(P<0.05).②There was no significant difference in slaughter performance and immune organ indices among the three test groups(P>0.05).③There was no significant difference in breast muscle pH,chicken color,drip loss,and shear force among the three groups(P>0.05),but cooking loss of chicken breast in inorganic trace element group was 27.46%and 22.53%higher than those in organic trace element group and compound group,respectively(P<0.05).④MDA content in serum in organic trace element group was 15.61%lower than that in inorganic trace element group(P<0.05).[Conclusion]Complete substitution of inorganic copper,iron,zinc and manganese by small peptide chelated copper,iron,zinc,and manganese significantly increases ADG of broilers,improves quality of chicken breast,and enhances antioxidant capacity.
