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Efficient degradation of aqueous dichloromethane by an enhanced microbial electrolysis cell:degradation kinetics,microbial community and metabolic mechanisms

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Journal of Environmental Sciences 2024年第5期139卷 150-159页

作者： Meng Wu Di Zhao Bing Gu ZiruWang Jun Hu Zhiliang Yu Jianming Yu College of Environment College of Biotechnology and BioengineeringCollaborative Innovation Center of Yangtze River Delta Region Green PharmaceuticalsZhejiang University of TechnologyHangzhou 310014China Shentuo Environment(Hangzhou)Co.Ltd. Hangzhou 311121China Zhejiang Tianyi Environmental Co.Ltd. Hangzhou 310000China

Dichloromethane(DCM)has been listed as a toxic and harmful water pollutant,and its re moval needs *** electrolysis cells(MECs)are viewed as a promising alterna tive for pollutant removal,which can be strengthened from two aspects:microbial inocula tion and *** this study,the MEC for DCM degradation was inoculated with the ac tive sludge enhanced by Methylobacterium rhodesianum H13(strain H13)and then acclimated in the form of a microbial fuel cell(MFC).Both the introduction of strain H13 and the initi ation in MFC form significantly promoted DCM *** degradation kinetics were fitted by the Haldane model,with V_(max),K_(h),K_(i)and v_(max)values of 103.2 mg/L/hr,97.8 mg/L268.3 mg/L and 44.7 mg/L/hr/cm^(2),*** cyclic voltammogram implies that DCM redox reactions became easier with the setup of MEC,and the electrochemical impedance spectrogram shows that the acclimated and enriched microbes reduced the charge transfe resistance from the electrode to the *** the biofilm,the dominant genera shifted from Geobacter to Hyphomicrobium in acclimation ***,Methylobacterium played an increasingly important *** metabolism mainly occurred through the hydrolytic glutathione S-transferase pathway,given that the gene dcmA was identified rather than the dhlA and P450/*** exogenous electrons facilitated the reduction of GSSG,directly o indirectly accelerating the GSH-catalyzed *** study provides support fo the construction of an efficient and stable MEC for DCM removal in water environment.

关键词： Dichloromethane Microbial electrolysis cells Metabolic pathways Electron transfer degradation kinetics

Distribution and degradation kinetics of cyhalodiamide in Chinese rice field environment

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Chinese Journal of Chemical Engineering 2018年第10期26卷 2185-2191页

作者： Yiping Liu Ya Zhang Shuangqing Liu Yuntao Lü Ronghua Lin Min Li Xiaolan Liao Xiaogang Li College of Plant Protection Hunan Agricultural University Institute for the Control of Agrochemicals Hunan Province Institute for the Control of Agrochemicals Ministry of Agriculture and Rural Affairs

Cyhalodiamide is a novel agrochemical which is effective against Lepidoptera pests,including Cnaphalocrocis medinalis,Chilo suppressalis,Pieris rapae,Plutella xylostella,Helicoverpa armigera,*** the study,a fast and accurate analytical method was developed to detect cyhalodiamide in Chinese typical rice field environment by a modified Qu ECh ERS(Quick,Easy,Cheap,Effective,Rugged,Safe)method with UPLC-MS/MS(ultra-high performance chromatography-tandem mass spectrometry).The mean recoveries of cyhalodiamide varied from 73.5% to 107.5%,with the RSDs from 1.2% to 10.7%.The limits of determination(LODs)were 0.0005 mg·kg^(-1),and the limits of quantitation(LOQs)were from 0.002 to 0.01 mg·kg^(-1)in all five *** method was used to determine cyhalodiamide residues for studies of the distribution and degradation kinetics in rice field *** field trials results showed that cyhalodiamide was easily degradable and the half-lives were4.2–13.6 d in rice straw,8.77 d in paddy soil and 5.37–8.45 d in paddy water,*** final residues of cyhalodiamide in brown rice were below 0.35 mg·kg^(-1).The used dosage of 33.75 g·hm^(-2)with pre-harvest interval(PHI)of 21 d and the maximum residue limit(MRL)of cyhalodiamide in rice at 0.1 mg·kg^(-1)were recommended,which would be safe to human health and *** developed analytical method will be useful to monitor cyhalodiamide residues and safety evaluation in rice environment.

关键词： Cyhalodiamide QuEChERS Rice Residue degradation kinetics

Thermal degradation kinetics of Three Kinds of Representative Anthocyanins Obtained from Blood Orange

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Agricultural Sciences in China 2011年第4期10卷 642-649页

作者： LIU Liang CAO Shao-qian PAN Si-yi Department of Applied Biology Zhejiang Pharmaceutical College Ningbo 315100 P.R.China College of Biological and Environmental Sciences Zhejiang Wanli University Ningbo 315190 P..R. China College of Food Science and Technology Huazhong Agricultural University Wuhan 430070 P.R.China

Cyanidin-3-glucoside, cyanidin-3-（6′′-malonyl）-glucoside, and cyanidin-3-glucoside-derived pyranoanthocyanins which were three major anthocyanins of blood orange, were obtained using a Toyopearl TSK HW-40S column chromatography. Then, thermal degradation kinetics of the three major anthocyanins was studied at selected temperatures （70, 80, and 90°C）. degradation parameters such as k and t1/2 values were determined. The activation energy （Ea） values for cyanidin- 3-glucoside, cyanidin-3-（6′′-malonyl）-glucoside and cyanidin-3-glucoside-derived pyranoanthocyanin were 75.4, 79.5, and 81.7 kJ mol-1, respectively. Ea values suggested that cyanidin-3-glucoside-derived pyranoanthocyanin had the highest stability, followed by cyanidin-3-（6′′-malonyl）-glucoside and cyanidin-3-glucoside. However, t1/2 values indicated cyanidin- 3-glucoside-derived pyranoanthocyanin degraded faster than cyanidin-3-（6′′-malonyl）-glucoside and cyanidin-3-glucoside at selected temperature.

关键词： blood orange anthocyanins purification identification degradation kinetics

Study on degradation kinetics of epalrestat in aqueous solutions and characterization of its major degradation products under stress degradation conditions by UHPLC-PDA-MS/MS

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Journal of Pharmaceutical Analysis 2019年第6期9卷 423-430页

作者： Hong Sun Suyan Liu Xun Gao Zhili Xiong Zhonggui He Longshan Zhao Shanxi Biosample Analysis Center Shanxi Health Vocational CollegeNo.100Wenjin StreetYuci DistrictJinzhong 030619PR China School of Pharmacy Shenyang Pharmaceutical UniversityNo.103Wenhua RoadShenyang 110016PR China

Drug stability is closely related to drug safety and needs to be considered in the process of drug production,package and *** investigate the stability of epalrestat,a carboxylic acid derivative,a reversed-phase high-performance liquid chromatography(RP-HPLC)method was developed in this study and applied to analyzing the degradation kinetics of epalrestat in aqueous solutions in various conditions,such as different pH,temperatures,ionic strengths,oxidation and *** calibration curve was A=1.6×10^5C–1.3×10^3(r=0.999)with the liner range of 0.5–24μg/mL,the intra-day and inter-day precision was less than 2.0%,as was the *** average accuracy for different concentrations was more than 98.5%,indicating that perfect recoveries were *** kinetic parameters such as degradation rate constants(k),activation energy(Ea)and shelf life(t0.9)under different conditions were calculated and *** results indicated that the degradation behavior of epalrestat was pH-dependent and the stability of epalrestat decreased with the rised irradiation and ionic strength;however,it was more stable in neutral and alkaline conditions as well as lower *** results showed that the degradation kinetics of epalrestat followed first-order reaction ***,the degradation products of epalrestat under stress conditions were identified by UHPLC-PDA-MS/MS,with seven degradation products being detected and four of them being tentatively identified.

关键词： Epalrestat RP-HPLC degradation kinetics UHPLC-PDA-MS/MS degradation products

Thermal degradation kinetics of Anthocyanins and Visual Color of Blood Orange Juice

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Agricultural Sciences in China 2011年第12期10卷 1992-1997页

作者： CAO Shao-qian LIU Liang PAN Si-yi College of Biological and Environmental Sciences Zhejiang Wanli University Ningbo 315100 PR.China Department of Applied Biology Zhejiang Pharmaceutical College Ningbo 315100 P.R.China College of Food Science and Technology Huazhong Agricultural University Wuhan 430070 P.R.China

Thermal degradation kinetics of anthocyanins and visual color （Hunter α value） of blood orange juice were studied at selected temperatures （70-90℃）. Results indicated that both the thermal degradation of anthocyanin and visual color all followed first-order reaction kinetics, and they could be expressed by Arrhenius equation. The activation energy values for the anthocyanins degradation and visual color degradation were 55.81 and 47.51 kJ tool-1, respectively. The linear relationship between visual color and anthocyanin content was obtained. Furthermore, during thermal processing of blood orange juice, the formulas about the linear relationships showed no significant difference at selected temperatures. So, the relationships between visual color and anthocyanins content during thermal processing at selected temperatures could be described by the same equation： α＊/αo＇=0.559（C/Co）＋0.43. It might be inferred that visual color measured instantaneously by tristimulus colorimeters for on-line quality control, could be used to predict the anthocyanins degradation during thermal processing of blood orange juice.

关键词： blood orange juice anthocyanins visual color degradation kinetics relationship

STUDY OF ACONITINE degradation kinetics IN RABBIT CORPSES

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Journal of Pharmaceutical Analysis 1996年第1期10卷 22-26,35页

作者：徐威胡炳蔚车向明王多劳多劳 Department of Toxicology Faculty of Forensic Medicine Xi'an Medical University Xi'an 710061 China

in order to research on the degradation kinetics rule or aconitine (AC) in rabbit corpses,in this article,through the acute intoxic models set up by orally administrating Aconitum brachypodum Diels (AbD) of absolute lethal dose (ALD) to New Zealand rabbits,the changing rules of aconitine degradation in tissues of rabbit corpses stored at 4℃ refrigirater were studied. The result showed that AC degradation process in rabbit corpses was apparent two-order degradation kinetics. AC degradation kinetics equations in liver and kidney were the half lives of them were 5.66 and 6. 47 days respectively.

关键词： degradation kinetics dynamic change aconitine acute toxicity

Research on the degradation kinetics Model in the Drying Process of Chinese Herb

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Chinese Journal of Chemical Engineering 2004年第6期12卷 822-825页

作者：任迪峰毛志怀王建中 College of Biology Beijing Forestry University Beijing 100083 China College of Engineering China Agricultural University Beijing 100083 China

Curative compositions such as catolpol in Rehmannia Glutinosa, flavone in Ophiopogon Japonicus and ginsenoside Re in Panax Ginseng in Chinese herbs were measured as the experimental indices by the method of high performance liquid chromatography under different drying conditions. The reaction order and parameters of the degradation kinetics model were determined and the model was verified by experiments. It was indicated that by comparing with the thin drying method, the prospective model could predict the degradation of curative compositions with drying time, temperature and moisture content of herbal materials with enough precision and could be used to simulate the degradation in the drying process of Chinese herb.

关键词： chinese herb drying degradation kinetics

Stability of anthocyanin in wild blueberry fruit and its degradation kinetics

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Stability of anthocyanin in wild blueberry fruit and its deg...

kinetics study of metaxalone degradation under hydrolytic, oxidative and thermal stress conditions using stability-indicating HPLC method

2010 3rd International Conference on Future BioMedical Information Engineering (FBIE 2010)

作者： Na Zhang College of Food Engineering Harbin University of Commerce Harbin Heilongjiang Province China Qingqi Guo College of Forestry Northeast Forestry University Harbin Heilongjiang Province China Yongqiang Ma College of Food Engineering Harbin University of Commerce Harbin Heilongjiang Province China

The effect of temperature on anthocyanin in wild blueberry fruit and chromatism were mensurated,and degradation kinetics of anthocyanin in wild blueberry fruit was *** results show that the anthocyanin in wild blueberry fruit is instable to heat,the degradation of anthocyanin in wild blueberry fruit is followed first-order reaction kinetics,and the thermal degradation activation energy of anthocyanin in wild blueberry fruit is 27.52 kJ/mol,the k0 is *** theoretical value and experimental value are propinquity,which indicate that the model is appropriate.

关键词： wild blueberry fruit anthocyanin stability degradation kinetics

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Journal of Pharmaceutical Analysis 2012年第6期2卷 431-436页

作者： Vamsi Krishna Marothu Rajendra N. Dash Saritha Vemula Shravani Donkena Ramesh Devi Madhavi Gorrepati Alliance Institute of Advanced Pharmaceutical and Health Sciences

An isocratic stability indicating RP-HPLC-UV method is presented for the determina- tion of metaxalone （MET） in the presence of its degradation products. The method uses Dr. Maisch C18 column （250 mm × 4.6 mm, 5μm） with mobile phase consisting of acetonitrile-potassium dihydrogen orthophosphate buffer with 4 mL of 0.4% triethyl amine （pH 3.0; 10 mM）（58：42, v/v） at a flow rate of 1.0 mL/min, pH of the buffer was adjusted with o-phosphoric acid. UV detection was performed at 225 nm. The method was validated for specificity, linearity, precision, accuracy, limit of detection, limit of quantification and robustness. The calibration plot was linear over the concentration range of 1-100 μg/mL having a correlation coefficient （r2） of 0.999. Limits of detection and quantification were 0.3 and 1μg/mL, respectively. Intra-day and inter-day precision （% RSD） was 0.65 and 0.79 respectively. The proposed method was used to investigate the degradation kinetics of MET under different stress conditions employed. degradation of MET followed a pseudo-first-order kinetics, and rate constant （K）, time left for 50% potency （t1/2）, and time left for 90% potency 090） were calculated.

关键词： Metaxalone degradation kinetics RP-HPLC-UV