Preparation and characterization of epoxidized microbial oil

Xinde Chen,Dan Yang,Lian Xiong,Bo Wang,Xuefang Chen,Can Wang,Hairong Zhang,Haijun Guo 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.3

The potential of microbial oil derived from yeasts through fermentation using crops biomass for the formation of plasticizers was investigated. Plasticizers were formed via epoxidation reaction. Five factors of the orthogonal experiment (reaction temperature, time, weight ratio of H2O2/MO, H2SO4/MO, and HCOOH/MO) have been used for optimization of parameters. To further enhance the iodine value of microbial oil and increase the epoxy value of the epoxide, an amount of soybean oil was added. The products were characterized by FTIR, 13C-NMR and 1H-NMR. Under the optimum condition, the epoxy value and the iodine value of epoxide product were 6.21% and 1.8 g I2/100 g with a yield of 91.86% at an oil conversion of 98.43%. This study successfully demonstrated the conversion of crops biomass into value-added chemicals using simple and conventional chemical reactions.

Role of Myocardial Extracellular Volume Fraction Measured with Magnetic Resonance Imaging in the Prediction of Left Ventricular Functional Outcome after Revascularization of Chronic Total Occlusion of Coronary Arteries

Yinyin Chen,Xinde Zheng,Hang Jin,Shengming Deng,Daoyuan Ren,Andreas Greiser,Caixia Fu,Hongxiang Gao,Mengsu Zeng 대한영상의학회 2019 Korean Journal of Radiology Vol.20 No.1

Objective: The purpose of this study was to prospectively investigate the value of the myocardial extracellular volume fraction (ECV) in predicting myocardial functional outcome after revascularization of coronary chronic total occlusion (CTO). Materials and Methods: Thirty patients with CTO underwent cardiovascular magnetic resonance (CMR) before and 6 months after revascularization. Three baseline markers of functional outcome were evaluated in the dysfunctional segments assigned to the CTO vessels: ECV, transmural extent of infarction (TEI), and unenhanced rim thickness (RIM). At the global level, the ECV values of the whole myocardium with and without a hyperenhanced region (global and remote ECV) were respectively measured. Results: In per-segment analysis, ECV was superior to TEI and RIM in predicting functional recovery (area under receiver operating characteristic curve [AUC]: 0.86 vs. 0.75 and 0.73, all p values < 0.010), and it emerged as the only independent predictor of regional functional outcome (odds ratio [OR] = 0.83, 95% confidence interval [CI]: 0.77–0.89; p < 0.001) independent of collateral circulation. In per-patient analysis, global baseline ECV was indicative of ejection fraction (EF) at the follow-up examination (β = -0.61, p < 0.001) and changes in EF (β = -0.57, p = 0.001) in multivariate regression analysis. A patient with global baseline ECV less than 30.0% (AUC, 0.93; sensitivity 94%, specificity 80%) was more likely to demonstrate significant EF improvement (OR: 0.38; 95% CI: 0.17–0.85; p = 0.019). Conclusion: Extracellular volume fraction obtained by CMR may provide incremental value for the prediction of functional recovery both at the segmental and global levels in CTO patients, and may facilitate the identification of patients who can benefit from revascularization.

Characterization and quantification of electron donating capacity and its structure dependence in biochar derived from three waste biomasses

Zhang, Yue,Xu, Xiaoyun,Cao, Lingzhi,Ok, Yong Sik,Cao, Xinde Elsevier 2018 CHEMOSPHERE - Vol.211 No.-

<P><B>Abstract</B></P> <P>Biochar has shown a unique electrochemical property being involved in various redox reactions in soil and water. In this study, the electron donating capacities (EDCs) of biochar pyrolyzed at 200–800 °C from pine wood, barley grass and wheat straw were investigated by using the mediated electrochemical oxidation method. The EDC values for all biochar were in the range of 0.18–1.83 mmol e<SUP>−</SUP> (g biochar)<SUP>−1</SUP>, showing the increase as the temperature increased from 200 °C to 400 °C, the decrease from 400 °C to 650 °C, and then increase from 650 °C until to 800 °C. At low and intermediate temperatures of 200–650 °C, the EDCs were mainly attributed to the phenolic hydroxyl groups, while the conjugated π-electron system associated with aromatic structure dominated the EDCs of biochar at the high temperatures of over 650 °C. The barley grass- and wheat straw-derived biochar had higher EDCs than the pine wood-derived biochar, resulting from the higher phenolic hydroxyl groups in the former samples than the latter one. In conclusion, the reductive property of biochar was mainly attributed to both phenolic hydroxy group and conjugated π-electron system associated with aromatic structure, depending on the pyrolytic temperature and feedstock source. The results will help us to obtain a complete view on the role of biochar in biogeochemical redox reactions and consider developing biochar with controlled redox properties for specific environmental applications such as electron shuttle and catalyst material.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Quantification of the relationship between EDCs and phenolic groups and conjugate π-electron system were reported. </LI> <LI> At low and intermediate temperatures, the EDCs were mainly attributed to the phenolic groups. </LI> <LI> At high temperatures, the conjugated π-electron system associated with aromatic structure dominated the EDCs of biochar. </LI> <LI> Developing biochar with controlled redox properties was proposed for specific environmental applications. </LI> </UL> </P>

Electrosynthesis of Pure Poly(3,4-ethylenedioxythiophene) (PEDOT) in Chitosan-Based Liquid Crystal Phase

Xue Meng,Zhen Wang,Luyan Wang,Meishan Pei,Wenjuan Guo,Xinde Tang 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5

Ordered poly(3,4-ethylenedioxythiophene) (PEDOT) was successfully prepared by electrochemical polymerization of 3,4-ethylenedioxythiophene in lyotropic liquid crystal phase formed by chitosan in an acetic acid solution. The structure, performance, and morphology of PEDOT were characterized by infrared absorption spectra, cyclic voltammograms, polarizing optical microscopy, and scanning electron microscopy. The ordered pure PEDOT film with good electrochemical behavior exhibited obvious birefringence.

Mouse Fyn induces pseudopodium formation in Chinese hamster ovary cells

Lei An,Shengnan Liu,Wei Zhang,Yamei Zhang,Yingxue Huang,Xinde Hu,Shu-lin Chen,Shanting Zhao 대한수의학회 2014 JOURNAL OF VETERINARY SCIENCE Vol.15 No.1

Molecular mechanisms underlying the effects of Fyn on cellmorphology, pseudopodium movement, and cell migrationwere investigated. The Fyn gene was subcloned into pEGFP-N1to produce pEGFP-N1-Fyn. Chinese hamster ovary (CHO)cells were transfected with pEGFP-N1-Fyn. The expression ofFyn mRNA and proteins was monitored by reversetranscription-PCR and Western blotting. Additionally,transfected cells were stained with 4´,6-diamidino-2-phenylindole and a series of time-lapse images was taken. Sequences of the recombinant plasmids pMD18-T-Fyn andpEGFP-N1-Fyn were confirmed by sequence identificationusing National Center for Biotechnology Information in USA,and Fyn expression was detected by RT-PCR and Westernblotting. The morphology of CHO cells transfected with therecombinant vector was significantly altered. Fyn expressioninduced filopodia and lamellipodia formation. Based on theseresults, we concluded that overexpression of mouse Fyn inducesthe formation of filopodia and lamellipodia in CHO cells, andpromotes cell movement.

In‑situ growth of ZIF‑8/CP with ultra‑high adsorption capacity for removing Malachite green from water

Jie Lou,Qiuping Fu,Lei Yu,Hui Yuan,Jie Zhao,Xinde Wei,Tong Wang,Changli Mo 한국탄소학회 2023 Carbon Letters Vol.33 No.7

An environmentally friendly and low-cost chitosan-containing polysaccharide (CP) composite ZIF-8/CP was designed and prepared based on the difficulty of separating the traditional adsorbent from the water phase. ZIF-8/CP was synthesized through in-situ growth approach. The physical, chemical and structure properties of ZIF-8/CP were determined through a series of characterization methods, including SEM, FT-IR and PXRD. The effects of touch time, pH, temperature, and coexisting ions on adsorption were assessed. In addition, kinetics, isotherms of adsorption and thermodynamics were examined. The data of isotherms for adsorption indicated that the adsorption of ZIF-8/CP on MG was similar to the Langmuir model, with a maximum adsorption capacity of 1428.57 mg/g. Moreover, the kinetic parameters were consistent with the pseudo- 2nd-order equation. Thermodynamic studies (ΔG < 0, ΔH > 0) demonstrated a heat-absorbing and spontaneous adsorption process. Our study reveals that ZIF-8/CP has good adsorption properties and environmental properties.

Current progress on gold recovery from refractory ore and waste electrical and electronic equipment

Ji Xuran,Shen Zhijie,Xu Wenping,Yao Shimiao,Zhang Hairong,Xiong Lian,Li Hailong,Guo Haijun,Chen Xuefang,Chen Xinde 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9

The physical and chemical properties of gold promote its application, such as in the high-tech, electronic products, and aerospace industries. The easily leachable ore is gradually depleted. Thus, it becomes necessary to extract gold from other resources such as refractory ore and electrical and electronic equipment. The normal method of leaching for gold is cyanide leaching, but it is very dangerous for both environment and operator. Non-cyanide leaching methods, including thiourea leaching, halide leaching, and sulfate leaching have been developed to substitute cyanide leaching. A variety of methods to enrich gold from leaching solutions are described in this paper, including solvent extraction, electrowinning, activated carbon adsorption, and ion exchange resins. Among those methods, ion exchange resins can adsorb gold with high adsorption efficiency and regenerate easily as well. This paper focuses on the research progress of the recovery of gold from non-cyanide leachates by ion exchange resins, summarizes the existing resin types and elution processes, points out the limitations in the application of current ion exchange resins, and discusses possible solutions.

Piperazine-activated diethanolamine formulation for post-combustion CO2 capture

Bisweswar Das,Haijun Guo,Lian Xiong,Bishnupada Mandal,Arindam Modak,Kamal Kishore Pant,Xinde Chen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-

Although activated alkanolamine based solvents had great potential for energy-efficient post-combustionCO2 capture, yet these suffers from disadvantageous due to high capital cost of the process. In thisresearch we developed and discussed the overall reaction scheme between CO2 and activated solvents. We investigated the kinetics of CO2 into piperazine (PZ) activated aqueous diethanolamine (DEA) bywetted-wall column contactor at (298–323) K, (5–15) kPa and fixed 3.0 kmol∙m3. Physicochemical propertiesof such systems were determined while detailed uncertainty analysis were conducted. In thermodynamicspoint of view, liquid–liquid interaction were explored and evaluated by related parameters. The kinetics rate parameters for such activated solvents were interpreted based on kinetic study affordingto the pseudo-first-order reaction method. At various temperature, kov of (PZ + DEA + H2O) were considerablylarger than reported (AMP + PZ + H2O) systems. The results of kinetics study demonstrated thatrate of CO2 in solvents were enhanced substantially as compared to DEA due to the addition of low quantity(0–0.45 kmol∙m3) PZ into solvents. Besides, physicochemical properties were measured in terms ofdifferent models with absolute average deviation (AAD) < 5 %. Ultimately, (PZ + DEA + H2O) may be consideredas vital solvents in amine scrubbing due to lower energy requirement for CO2 capture comparedto (PZ + MEA + H2O).

The Efficacy Analysis of Endoscopic Third Ventriculostomy in Infantile Hydrocephalus

He, Zhenhua,An, Caixia,Zhang, Xinding,He, Xiaodong,Li, Qiang The Korean Neurosurgical Society 2015 Journal of Korean neurosurgical society Vol.57 No.2

Objective : To investigate the efficacy of endoscopic third ventriculostomy (ETV) for infantile hydrocephalus. Methods : Retrospectively reviewed the 17 infantile hydrocephalus cases who were treated with ETV between July 2009 and June 2013. The study includes 17 patients (4 Han and 13 Hui) between the ages of 51 and 337 days. Five cases with encephalitis history and 2 cases with cerebral hemorrhage, with the remaining 10 cases congenital hydrocephalus. ETVs were performed for all patients with 1 case failing because the severe ventricle inflammatory adhesion, excessive exudation, and vague basilar artery. Results : Among the 16 successful cases 7 cases improved remarkably : heads and ventricles reduced and cerebral cortexes thickening morphologically. The ventricles of the remaining cases were unchanged. Conclusion : The ethnic minority account for the majority of the patients in this study. ETV is effective for infantile obstructive hydrocephalus.