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The interaction mechanism between zein and folic acid in alkaline aqueous solutions:an experimental and molecular simulation study

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Food Quality and Safety 2024年第1期8卷 166-178页

作者： Jun Zhu Yiling Yao Yuying Liao Lala Cai Wenqi Zhang Nuo Hong Wenlin Sun chunhua xiong Lanying Yao School of Food Science and Biotechnology Zhejiang Gongshang UniversityHangzhouChina

Objectives:Folic acid is a vitamin that is not highly soluble in water and is sensitive to the ***,it is important to find suitable *** study aimed to exemplify the interaction of folic acid with zein in alkaline aqueous solutions and shed light on how zein can be used as a carrier for folic *** and Methods:Zein and folic acid were separately dissolved in NaOH solutions with a PH of *** solution and folic acid solution were combined in specific *** methods including multi-spectroscopy,dynamic light scattering,and electron microscopy combining with molecular dynamics simulations were used to study the interaction mechanism between zein and folic acid in alkaline aqueous ***:Fluorescence spectroscopy showed that the quenching of zein by folic acid was mainly static,and the main driving force behind this interaction was van der Waals forces and hydrogen *** formation of zein–folic acid complexes was confirmed by ultraviolet–visible spectroscopy,Fourier transform infrared spectroscopy,and circular dichroism *** results also showed that the structure of zein changed when it interacted with folic *** light scattering analysis revealed that the addition of folic acid caused proteins to *** aggregates of the complexes had an irregular shape and were large,as observed by scanning electron microscopy and transmission electron *** simulation was used to further investigate the interaction *** to these findings,the folic acid molecule interacted with zein in a shallow recess near the protein *** dominant forces at play in the zein–folic acid interaction were van der Waals forces and electrostatic forces,including hydrogen ***:The zein alkali-soluble system is very suitable for folic acid delivery.

关键词： Zein folic acid alkaline aqueous solutions molecular simulation interaction mechanism.

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Sorption behavior of iminodiacetic acid resin for indium

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Rare Metals 2008年第2期27卷 153-157页

作者： xiong chunhua YAO Caiping Department of Applied Chemistry Zhejiang Gongshang University Hangzhou 310035 China

In（Ⅲ） was quantitatively adsorbed by iminodiacetic acid resin （IDAAR） in the medium of pH = 4.52. The statically saturated sorption capacity of IDAAR is 235.5 mg·g^-1. 1.0 mol·L^-1 HCl can be used as an eluant. The elution efficiency is 97.9%. The resin can be regenerated and reused without apparent decrease of sorption capacity. The sorption rate constant is k298 = 1.94 × 10-5 s^-1. The apparent sorption activation energy of IDAAR for In（Ⅲ） is 20.1 kJ·mol^-1. The sorption behavior of IDAAR for In（HI） obeys the Freundlich isotherm. The enthalpy change is AH= 17.2 kJ·mol^-1.

关键词： iminodiacetic acid resin indium(Ⅲ) sorption activation energy enthalpy change

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Adsorption behavior of Pd(Ⅱ) from aqueous solutions by D201 resin

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Rare Metals 2011年第5期30卷 470-476页

作者： xiong chunhua ZHU Shan YAO Caiping CHEN Qing Department of Applied Chemistry Zhejiang Gongshang University Hangzhou 310012 China

The adsorption and desorption behaviors of Pd（Ⅱ） on D201 resin were investigated. The effects of parameters including HCl concentrations, initial metal ion concentrations, contact time, and temperature on the adsorption of Pd（Ⅱ） were studied by batch method. The HCl concentration for studying the effects was set from 0.01 to 2 mol·L-1 and the optimal adsorption condition is in 0.01 mol·L-1 HCl solution. The adsorption isotherm of Pd（Ⅱ） on D201 resin was determined and the equilibrium data fitted the Langmuir model better than the Freundlich model. The maximum uptake capacity of Pd（Ⅱ） was 253 mg·g-1 at 298 K. The adsorption could be best described by the liquid film diffusion model. The enthalpy variation （ΔH） and entropy change （ΔS） of adsorption were equal to 2.49 kJ·mol-1 and 74.8 J·（mol·K）-1 respectively, indicating that the adsorption was endothermic in nature. Furthermore, the negative value of ΔG showed that movement of adsorbate from the solution to adsorbent surface was a spontaneous process. Pd（Ⅱ） could be eluted with 0.5 mol·L-1 HNO 3 solution. Thomas model was applied to experimental column data to determine the characteristic parameters of the column useful for process design.

关键词： adsorption palladium resins thermodynamics kinetics

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Effects of chitosan oligosaccharide-nisin conjugates formed by Maillard reaction on the intestinal microbiota of high-fat diet-induced obesity mice model

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Food Quality and Safety 2019年第3期3卷 169-177页

作者： Xiaojie Zheng Xin Zhang chunhua xiong School of Food Science and Biotechnology Zhejiang Gongshang UniversityHangzhou Department of Food Science and Engineering School of Marine SciencesNingbo UniversityP.R.China

Objectives:The goal of this study was to evaluate the modulatory effect of chitosan oligosaccharide-nisin conjugate(CON-C)on intestinal microbiota of human flora-associated(HFA)mice and also reveal its effect towards the high-fat diet(HFD)-induced *** Chitosan oligosaccharides and nisin showed great potential in modulating the intestinal microbiota,so it is worth to explore whether the modulation effect of chitosan oligosaccharide could be improved by covalently binding with *** and Methods:CON-C was prepared by heating the mixed solution of chitosan oligosaccharide and nisin at 80℃ and pH 2.0 for *** structure of CON-C were analyzed by Fourier transform-infrared spectroscopy(FT-IR)and X-ray diffraction(XRD).The CON-C’s anti-obesity effect and modulatory effect toward intestinal microbiota were analyzed using human flora-associated(HFA)mice ***:CON-C could alleviated HFD-induced gut dysbiosis,by significantly decreasing the numbers of Bifidobacterium and Lactobacillus/Enterococcus spp.,and increasing the numbers of Bacteroides-Prevotella and Clostridium ***-C could also enriched the most differentially expressed genes through KEGG pathways of biosynthesis of amino acids,two-component system,and ATP binding cassette(ABC)***:The improved therapeutic effect of CON-C against HFD-induced obesity has been approved,and hence,CON-C has a great potential to be utilized as a functional food ingredient in reducing body weight.

关键词： chitosan oligosaccharide nisin Maillard reaction modulatory effect intestinal microbiota

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Comparative Studies on Low Noise Greases Operating under High Temperature Oxidation Conditions

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China Petroleum Processing & Petrochemical Technology 2014年第4期16卷 100-106页

作者： xiong chunhua Mi Hongying Feng Qiang Wu Baojie Beijing POL Research Institute Tianjin Branch Lubricant CompanySINOPEC Corp.

Oxidation induction time(OIT) testing by differential scanning calorimetry(DSC) was used to evaluate the oxidation resistance of lubricating greases. Under the high temperature condition, bearing noise was detected when grease passed the initial stable stage of oxidation. The chemical and physical structure of grease samples before and after high temperature oxidation were also analyzed by FT-IR spectrometry and scanning electron microscopy(SEM), then the effects of oxidation at high temperature on bearing noise were investigated. It is found out that for lithium greases, oxidation of base oil and thickener is the main reason responsible for the increasing bearing noise. As regards the polyurea greases, the change of fiber microstructure at high temperature is the main reason for the increasing bearing noise.

关键词： high temperature bearing noise oxidation lubricating grease

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Adsorption behavior and mechanism of D113 resin for lanthanum

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Rare Metals 2007年第6期26卷 601-606页

作者： SHU Zengnian xiong chunhua SHEN Qiuxian YAO Caiping GU Zhenyu Department of Chemistry Lishui University Lishui 323000 China College of Food Science Biotechnology and Environmental Engineering Zhejiang Gongshang University Hangzhou 310035 China

The sorption properties of macroporous weak acid resin （D113） for La^3＋ ion were studied by chemical analysis and IR spectra. Experimental results indicate that the D113 resin has a good adsorption ability for La^3＋ at pH = 6.0 in the HAc-NaAc medium. The statically saturated adsorption capacity is 273.3 mg/g. Separation coefficients of βLa^3＋/Ce^3＋, βLa^3＋/Gd^3＋, βLa^3＋/Er^3＋, and βLa^3＋/Y^3＋ are 2.29, 3.64, 4.27, and 0.627, respectively. The apparent activation energy of adsorption, Ea is 18.4 kJ/mol, the thermodynamics parameters AH, AS, and AG of sorption are 4.53 kJ/mol, 61.8 J/（mol·K）, -13.9 kJ/mol, respectively. The adsorption behavior of D113 for La^3＋ obeys the Freundlich isotherm. La^3＋adsorbed on resin can be eluted by 2.0 mol/L HCl quantitatively.

关键词： adsorption macroporous weak acid resin lanthanum mechanism kinetics

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ADSORPTION OF SAMARIUM(III) ON DIGLYCOLAMIDIC ACID RESIN

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Chinese Journal of Reactive Polymers 2003年第1期12卷 70-77页

作者： SHI Linmei xiong chunhua MO Jianjun College of professional Technology Lishui Normality SpecialityLishuiZhejiang323000China College of Food Science Biotechnology&Environmental Engineering Hangzhou University of CommerceHangzhou 310035China Department ofChemistry Lishui Teachers CollegeLishuiZhejiang 323000China

The sorption behavior and mechanism of a novel chelate resin, diglycolamidic acid resin (DAAR), for Sm(III) were investigated. The optimal sorption condition of DAAR for Sm(III) is pH=6.0 in HAc-NaAc medium. The statically saturated sorption capacity is 190mg/g resin at 298K. The Sm(III) adsorbed on DAAR can be eluted reaching 100% by 0.5~2.0mol/L HCl used as eluant. The resin can be regenerated and reused without apparent decrease of sorption capacity. The apparent sorption rate constant is k298= 1.96×10-5s-1. The apparent activation energy is 26kJ/mol. The sorption behavior of DAAR for Sm(III) obeys the Freundlich isotherm. The thermodynamic sorption parameters, enthalpy change 腍 of DAAR for Sm(III) is 16.9kJ/mol. The molar coordination ratio of the functional group of DAAR to Sm (III) is 3. The sorption mechanism of DAAR for Sm(III) was examined by using chemical method and IR spectrometry. The coordination bond was formed between oxygen atoms in the functional group of DAAR and Sm(III).

关键词： Diglycolamidic acid resin Samarium Sorption mechanism

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SORPTION BEHAVIOR AND MECHANISM OF SAMARIUM(III) ON AMINO METHYLENE PHOSPHONIC ACID RESIN

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Chinese Journal of Reactive Polymers 2001年第2期10卷 173-178页

作者： Wang Yongjiang WU Xiangmei xiong chunhua Department of Chemistry Lishui Teachers CollegeLishuiZhejiang 323000

Sm(III) was quantitatively adsorbed by amino methylene phosphonic acid resin (APAR) in the medium of pH=5.0. The statically saturated sorption capacity is 251mg/g·resin. Sm(III) adsorbed on APAR can be reductively eluted by 2.0mol/L HCl. The sorption rate constant is k298= 1.35×10-5s-1. The sorption behavior of APAR for Sm(III) obeys the Freundlich isotherm. The enthalpy change △H of sorption is 24.9kJ/mol. The apparent activation energy is Ea=11.7kJ/mol. The sorption mechanism shows that the nitrogen and oxygen atoms of the functional group of APAR coordinated with Sm(III) to form coordination bond.

关键词： Amino methylene phosphonic acid resin Samarium Adsorption Mechanism.

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STUDIES ON THE SORPTION OF MACROPOROUS PHOSPHONIC ACID RESIN FOR LANTHANUM

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Chinese Journal of Reactive Polymers 1998年第2期7卷 7-15页

作者： xiong chunhua Su Zhengnian Chen Yiyong Department of Chemistry Lishui Teachers CollegeZhejiang 323000 Department of Chemistry Zhejiang University West Brook CampusHangzhou 310028

The influences of medium pH sorption temperature, sorption time, etc. on thesorption capacity of macroporous Phosphonic acid resin for La3+ were determined Thesorption rate constant was k298 = 7.64×10-5 s-1. The complex ratio of phosphonicgroups of the resin to La3+ was 3:1. The basic sorption parameters were determinedThe sorption mechanism of macroporous phosphonic acid resin for La3+ was examinedby chemical analysis and IR- spectrometry.

关键词： Lanthanum Macroporous phosphonic acid resin Sorption Mechanism

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Investigating the Effect of Methylcyclopentadienyl Manganese Tricarbonyl on the Properties of Unleaded Motor Gasoline (1): Induction Period

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China Petroleum Processing & Petrochemical Technology 2004年第1期6卷 17-22页

作者： Lu Changbo xiong chunhua Liu Huiying Wei Rui( POL Research Institute of General Logistics Department, PLA, Beijing 102300) POL Res. Inst. Ceneral Log. Dept. PLA Beijing 102300 China

In this paper, the effect of MMT on the induction period of unleaded motor gasoline was studied, the manganese concentration, storage period of MMT-blended gasoline and environmental variables such as temperature and radiation intensity were considered to be main factors affecting the induction period of gasoline,when MMT-blended gasoline was exposed to light. It is found from experiments that the addition of MMT can improve the induction period of gasoline that is shielded from light, and reduce the induction period remarkably,when the gasoline is exposed to light. However, the radiation intensity is proved to be the leading influencing factor among all the environmental variables investigated.

关键词： MMT gasoline base gasoline induction period stability storage experiment exposure experiment

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