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Keiichi Kimura - One of the best experts on this subject based on the ideXlab platform.
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morphological changes in vesicles and release of an encapsulated compound triggered by a photoresponsive Malachite Green leuconitrile derivative
Langmuir, 2010Co-Authors: Eri Hiraishi, Ryo Ohnishi, Yoshio Nakahara, Keiichi KimuraAbstract:Photoinduced morphological changes in phosphatidylcholine vesicles are triggered by a Malachite Green leuconitrile derivative dissolved in the lipidic membrane, and are observed at Malachite Green derivative/lipid ratios <5 mol %. This Malachite Green derivative is a photoresponsive compound that undergoes ionization to afford a positive charge on the molecule by UV irradiation. The Malachite Green derivative exhibits amphiphilicity when ionized photochemically, whereas it behaves as a lipophilic compound under dark conditions. Cryo-transmission electron microscopy was used to determine vesicle morphology. The effects of the Malachite Green derivative on vesicles were studied by dynamic light scattering and fluorescence resonance energy transfer. Irradiation of vesicles containing the Malachite Green derivative induces nonspherical vesicle morphology, fusion of vesicles, and membrane solubilization, depending on conditions. Furthermore, irradiation of the Malachite Green derivative induces the release of ...
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photoinduced micelle to vesicle transition and encapsulation of glucose by photoresponsive Malachite Green leuconitrile derivative
Soft Matter, 2008Co-Authors: Ryoko M Uda, Yoshio Nakahara, Tomoyuki Tanabe, Keiichi KimuraAbstract:UV irradiation on a Malachite Green leuconitrile derivative afforded a cationic surfactant in aqueous solutions of sodium bis(2-ethylhexyl) sulfosuccinate. The result involved a micelle-to-vesicle transition and encapsulation which have been investigated by trapping experiment. Transmission electron microscopy was applied for direct observation of vesicle formation. The micellar solution was studied under dark conditions with pyrene emission spectra.
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microscopic location of photosensitive Malachite Green surfactant in mixed micelle and its photoinduced enhancement of solubilizing power
Colloid and Polymer Science, 2007Co-Authors: Ryoko M Uda, Keiichi KimuraAbstract:A Malachite Green derivative carrying a long alkyl chain affords photogenerated amphiphilicity by UV irradiation. The behavior of the photoresponsive Malachite Green surfactant was studied in mixed micelle solutions containing cetyltrimethylammonium chloride. We found that the Malachite Green surfactant increases the solubility of oily substance by UV irradiation. The role of the Malachite Green surfactant has been investigated by dynamic light scattering and spectroscopic analysis. The Malachite Green surfactant causes an increase in the micelle size, and its hydrophilic head group lies at the micellar interface. The mechanism of the photoinduced uptake of oily substances is discussed at the viewpoint of the microscopic location of the Malachite Green surfactant in the micelle.
Zhanfeng Zhao - One of the best experts on this subject based on the ideXlab platform.
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quantitative detection of trace Malachite Green in aquiculture water samples by extractive electrospray ionization mass spectrometry
International Journal of Environmental Research and Public Health, 2016Co-Authors: Xiaowei Fang, Shuiping Yang, Zhiquan Zhou, Xinglei Zhang, Konstantin Chingin, Zhanfeng ZhaoAbstract:Exposure to Malachite Green (MG) may pose great health risks to humans; thus, it is of prime importance to develop fast and robust methods to quantitatively screen the presence of Malachite Green in water. Herein the application of extractive electrospray ionization mass spectrometry (EESI-MS) has been extended to the trace detection of MG within lake water and aquiculture water, due to the intensive use of MG as a biocide in fisheries. This method has the advantage of obviating offline liquid-liquid extraction or tedious matrix separation prior to the measurement of Malachite Green in native aqueous medium. The experimental results indicate that the extrapolated detection limit for MG was ~3.8 μg·L−1 (S/N = 3) in lake water samples and ~0.5 μg·L−1 in ultrapure water under optimized experimental conditions. The signal intensity of MG showed good linearity over the concentration range of 10–1000 μg·L−1. Measurement of practical water samples fortified with MG at 0.01, 0.1 and 1.0 mg·L−1 gave a good validation of the established calibration curve. The average recoveries and relative standard deviation (RSD) of Malachite Green in lake water and Carassius carassius fish farm effluent water were 115% (6.64% RSD), 85.4% (9.17% RSD) and 96.0% (7.44% RSD), respectively. Overall, the established EESI-MS/MS method has been demonstrated suitable for sensitive and rapid (<2 min per sample) quantitative detection of Malachite Green in various aqueous media, indicating its potential for online real-time monitoring of real life samples.
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quantitative detection of trace Malachite Green in aquiculture water samples by extractive electrospray ionization mass spectrometry
Preprints, 2016Co-Authors: Xiaowei Fang, Shuiping Yang, Zhiquan Zhou, Xinglei Zhang, Konstantin Chingin, Zhanfeng ZhaoAbstract:Exposure to Malachite Green (MG) may pose great health risks to humans, thus it is of prime importance to develop fast and robust methods to quantitatively screen the presence Malachite Green in environment. Herein application of extractive electrospray ionization mass spectrometry (EESI-MS) has been extended to the trace detection of MG within lake water and aquiculture water, due to the intensive use of MG as biocide in fisheries. This method has the advantage of obviating offline liquid-liquid extraction or tedious matrix separation prior to the measurement of Malachite Green in native aqueous medium. The experimental results indicate that the extrapolated detection limit for MG was ~3.8 ug L-1 (S/N=3) in lake water samples and ~ 0.5 ug L-1 in ultrapure water under optimized experimental conditions. The signal intensity of MG showed good linearity over the concentration range of 10–5000 ug L-1. Measurement of practical water samples fortified with MG at 0.01 and 0.1 mg L-1 gave a good validation of the established calibration curve. The average recoveries of Malachite Green in lake water and Carassius carassius fish farm effluent water were 114.9% (6.6% RSD) and 85.4% (9.2% RSD), respectively. Overall, the established EESI-MS/MS method has been demonstrated suitable for sensitive and rapid ( Subject Areas extractive electrospray ionization; rapid detection; Malachite Green; water; mass spectrometry Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Get PDF Cite Share Readers' Comments and Ratings (0) Your full nameYour affiliation information (e.g., name of your university/institution/organization)Your Email address (not made public)Importance: How significant is the paper to the field?Outstanding/highlight paperSignificant contributionIncremental contributionNo contributionI am not qualified to judgeSoundness of evidence/arguments presented:Conclusions well supportedMost conclusions supported (minor revision needed)Incomplete evidence (major revision needed)Hypothesis, unsupported conclusions, or proof-of-principleI am not qualified to judgePlease leave your comment to this article below.12ΣΩMathematical equations can be typed in either LaTeX formats \\[ ... \\] or $$ ... $$, or MathML format ... . Try the LaTeX or MathML example.Type equation: Preview: Copy equation into message below Close menuPlease click a symbol to insert it into the message box below:†‡‰♠♣♥♦‾←↑→↓™…–—i¢£¤¥¦§©a«¬®¯°±²³´µ¶·¹o¼½¾?AAÂAAAAECEEEEIIIIÐNOOOOO×OUUUUÝÞsaaâaaaaeceeeeiiiiðnooooo÷ouuuuýþyΑαΒβΓγΔδEeΖζΗηΘθΙιΚκΛλΜμΝνΞξΟοΠπΡρΣσΤτΥυΦφΧχΨψΩω●• Close menuPlease enter the link here:Please enter a valid URLOptionally, you can enter text that should appear as linked text: Copy link into message below Close menuPlease enter or paste the URL to the image here (please only use links to jpg/jpeg, png and gif images):Please enter a valid URL Copy image into message below Close menu Type author name or keywords to filter the list of references in this group (you can add a new citation under Bibliography): No existing citations in Discussion GroupWikify editor is a simple editor for wiki-style mark-up. It was written by MDPI AG for Sciforum in 2014. The rendering of the mark-up is based on Wiky.php with some tweaks. Rendering of mathematical equations is done with MathJax. Please send us a message for support or for reporting bugs. Close menuPlease declare any conflict of interests that your comment might be involved, either financial or non-financial.I do not have any conflict of interest to comment on this article.I would like to declare conflict of interest.I accept Preprints User Comments Terms and Conditions Comments must follow the standards of professional discourse and should focus on the scientific content of the article. Insulting or offensive language, personal attacks and off-topic remarks will not be permitted. Comments must be written in English. Preprints reserves the right to remove comments without notice. Readers who post comments are obliged to declare any competing interests, financial or otherwise. Cancel Post Discuss and rate this article
Vasanth K Kumar - One of the best experts on this subject based on the ideXlab platform.
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equilibrium kinetics and mechanism modeling and simulation of basic and acid dyes sorption onto jute fiber carbon eosin yellow Malachite Green and crystal violet single component systems
Journal of Hazardous Materials, 2007Co-Authors: K Porkodi, Vasanth K KumarAbstract:Batch experiments were carried out for the sorption of eosin yellow, Malachite Green and crystal violet onto jute fiber carbon (JFC). The operating variables studied are the initial dye concentration, initial solution pH, adsorbent dosage and contact time. Experimental equilibrium data were fitted to Freundlich, Langmuir and Redlich-Peterson isotherm by non-linear regression method. Langmuir isotherm was found to be the optimum isotherm for eosin yellow/JFC system and Freundlich isotherm was found to be the optimum isotherm for Malachite Green/JFC and crystal violet/JFC system at equilibrium conditions. The sorption capacities of eosin yellow, Malachite Green and crystal violet onto JFC according to Langmuir isotherm were found to 31.49 mg/g, 136.58 mg/g, 27.99 mg/g, respectively. A single stage batch adsorber was designed for the adsorption of eosin yellow, Malachite Green and crystal violet onto JFC based on the optimum isotherm. A pseudo second order kinetic model well represented the kinetic uptake of dyes studied onto JFC. The pseudo second order kinetic model successfully simulated the kinetics of dye uptake process. The dye sorption process involves both surface and pore diffusion with predominance of surface diffusion at earlier stages. A Boyd plot confirms the external mass transfer as the rate limiting step in the dye sorption process. The influence of initial dye concentration on the dye sorption process was represented in the form of dimensionless mass transfer numbers (Sh/Sc(0.33)) and was found to be agreeing with the expression:
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biosorption of Malachite Green a cationic dye onto pithophora sp a fresh water algae
Dyes and Pigments, 2006Co-Authors: Vasanth K Kumar, V Ramamurthi, S SivanesanAbstract:Abstract Batch sorption experiments were carried out for the removal of Malachite Green from its aqueous solution using Pithophora sp., a fresh water algae as biosorbent. Dye uptake was found to increase with contact time and initial Malachite Green concentration. Equilibrium uptake was found to be pH dependent and maximum uptake was observed at a pH of 6. The effect of algae concentration on equilibrium uptake was also estimated. The equilibrium data tend to fit Freundlich isotherm equation. Kinetic studies showed that the biosorption process follows first order rate kinetics with an average rate constant of 0.9213 min−1. The study confirms that the fresh water algae can be used as biosorbent for the removal of Malachite Green from its aqueous solution. The biosorption process was found to be surface diffusion controlled with an effective diffusion coefficient of 0.011361 cm2/s.
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adsorption of Malachite Green onto pithophora sp a fresh water algae equilibrium and kinetic modelling
Process Biochemistry, 2005Co-Authors: Vasanth K Kumar, S Sivanesan, V RamamurthiAbstract:Abstract Batch biosorption experiments were carried out for the removal of Malachite Green a cationic dye from its aqueous solution using raw and thermally activated Pithophora sp., a fresh water algae as biosorbent. The operating variables studied are initial Malachite Green concentration, biomass concentration and solution pH. Pithophora sp. activated at 300 °C for 50 min posses a maximum sorption capacity for the range of initial dye concentrations studied (20–100 mg/L). The sorption kinetics were analysed using reversible first order kinetics, pseudo-first order, pseudo-second order model and the sorption data tend to fit very well in pseudo-second order model for the entire sorption time. The average pseudo-second order rate constant, K II and initial sorption rate h were determined to be 3.46 × 10 −3 and 7.97 × 10 2 mg/g h. Equilibrium data are very well represented by Redlich Peterson isotherm model followed by Freundlich and Langmuir isotherm model. The maximum sorption capacity was 117.647 mg/g at 30 °C. The negative value of free energy change (−8.585 kJ/mol) indicates the spontaneous nature of adsorption.
Xiaowei Fang - One of the best experts on this subject based on the ideXlab platform.
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quantitative detection of trace Malachite Green in aquiculture water samples by extractive electrospray ionization mass spectrometry
International Journal of Environmental Research and Public Health, 2016Co-Authors: Xiaowei Fang, Shuiping Yang, Zhiquan Zhou, Xinglei Zhang, Konstantin Chingin, Zhanfeng ZhaoAbstract:Exposure to Malachite Green (MG) may pose great health risks to humans; thus, it is of prime importance to develop fast and robust methods to quantitatively screen the presence of Malachite Green in water. Herein the application of extractive electrospray ionization mass spectrometry (EESI-MS) has been extended to the trace detection of MG within lake water and aquiculture water, due to the intensive use of MG as a biocide in fisheries. This method has the advantage of obviating offline liquid-liquid extraction or tedious matrix separation prior to the measurement of Malachite Green in native aqueous medium. The experimental results indicate that the extrapolated detection limit for MG was ~3.8 μg·L−1 (S/N = 3) in lake water samples and ~0.5 μg·L−1 in ultrapure water under optimized experimental conditions. The signal intensity of MG showed good linearity over the concentration range of 10–1000 μg·L−1. Measurement of practical water samples fortified with MG at 0.01, 0.1 and 1.0 mg·L−1 gave a good validation of the established calibration curve. The average recoveries and relative standard deviation (RSD) of Malachite Green in lake water and Carassius carassius fish farm effluent water were 115% (6.64% RSD), 85.4% (9.17% RSD) and 96.0% (7.44% RSD), respectively. Overall, the established EESI-MS/MS method has been demonstrated suitable for sensitive and rapid (<2 min per sample) quantitative detection of Malachite Green in various aqueous media, indicating its potential for online real-time monitoring of real life samples.
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quantitative detection of trace Malachite Green in aquiculture water samples by extractive electrospray ionization mass spectrometry
Preprints, 2016Co-Authors: Xiaowei Fang, Shuiping Yang, Zhiquan Zhou, Xinglei Zhang, Konstantin Chingin, Zhanfeng ZhaoAbstract:Exposure to Malachite Green (MG) may pose great health risks to humans, thus it is of prime importance to develop fast and robust methods to quantitatively screen the presence Malachite Green in environment. Herein application of extractive electrospray ionization mass spectrometry (EESI-MS) has been extended to the trace detection of MG within lake water and aquiculture water, due to the intensive use of MG as biocide in fisheries. This method has the advantage of obviating offline liquid-liquid extraction or tedious matrix separation prior to the measurement of Malachite Green in native aqueous medium. The experimental results indicate that the extrapolated detection limit for MG was ~3.8 ug L-1 (S/N=3) in lake water samples and ~ 0.5 ug L-1 in ultrapure water under optimized experimental conditions. The signal intensity of MG showed good linearity over the concentration range of 10–5000 ug L-1. Measurement of practical water samples fortified with MG at 0.01 and 0.1 mg L-1 gave a good validation of the established calibration curve. The average recoveries of Malachite Green in lake water and Carassius carassius fish farm effluent water were 114.9% (6.6% RSD) and 85.4% (9.2% RSD), respectively. Overall, the established EESI-MS/MS method has been demonstrated suitable for sensitive and rapid ( Subject Areas extractive electrospray ionization; rapid detection; Malachite Green; water; mass spectrometry Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Get PDF Cite Share Readers' Comments and Ratings (0) Your full nameYour affiliation information (e.g., name of your university/institution/organization)Your Email address (not made public)Importance: How significant is the paper to the field?Outstanding/highlight paperSignificant contributionIncremental contributionNo contributionI am not qualified to judgeSoundness of evidence/arguments presented:Conclusions well supportedMost conclusions supported (minor revision needed)Incomplete evidence (major revision needed)Hypothesis, unsupported conclusions, or proof-of-principleI am not qualified to judgePlease leave your comment to this article below.12ΣΩMathematical equations can be typed in either LaTeX formats \\[ ... \\] or $$ ... $$, or MathML format ... . Try the LaTeX or MathML example.Type equation: Preview: Copy equation into message below Close menuPlease click a symbol to insert it into the message box below:†‡‰♠♣♥♦‾←↑→↓™…–—i¢£¤¥¦§©a«¬®¯°±²³´µ¶·¹o¼½¾?AAÂAAAAECEEEEIIIIÐNOOOOO×OUUUUÝÞsaaâaaaaeceeeeiiiiðnooooo÷ouuuuýþyΑαΒβΓγΔδEeΖζΗηΘθΙιΚκΛλΜμΝνΞξΟοΠπΡρΣσΤτΥυΦφΧχΨψΩω●• Close menuPlease enter the link here:Please enter a valid URLOptionally, you can enter text that should appear as linked text: Copy link into message below Close menuPlease enter or paste the URL to the image here (please only use links to jpg/jpeg, png and gif images):Please enter a valid URL Copy image into message below Close menu Type author name or keywords to filter the list of references in this group (you can add a new citation under Bibliography): No existing citations in Discussion GroupWikify editor is a simple editor for wiki-style mark-up. It was written by MDPI AG for Sciforum in 2014. The rendering of the mark-up is based on Wiky.php with some tweaks. Rendering of mathematical equations is done with MathJax. Please send us a message for support or for reporting bugs. Close menuPlease declare any conflict of interests that your comment might be involved, either financial or non-financial.I do not have any conflict of interest to comment on this article.I would like to declare conflict of interest.I accept Preprints User Comments Terms and Conditions Comments must follow the standards of professional discourse and should focus on the scientific content of the article. Insulting or offensive language, personal attacks and off-topic remarks will not be permitted. Comments must be written in English. Preprints reserves the right to remove comments without notice. Readers who post comments are obliged to declare any competing interests, financial or otherwise. Cancel Post Discuss and rate this article
Sh. Elhami - One of the best experts on this subject based on the ideXlab platform.
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Removal of Malachite Green from water samples by cloud point extraction using Triton X-100 as non-ionic surfactant
Environmental Chemistry Letters, 2010Co-Authors: Nahid Pourreza, Sh. ElhamiAbstract:A surfactant mediated cloud point extraction (CPE) procedure has been developed to remove color from wastewater containing Malachite Green using Triton X-100 as non-ionic surfactant. The effects of the concentration of the surfactant, temperature and salt concentration on the different concentrations of dye have been studied and optimum conditions were obtained for the removal of Malachite Green. The concentration of Malachite Green in the dilute phase was measured using UV–Vis spectrophotometer. It was found that the separation of phases was complete and the recovery of Malachite Green was very effective in the presence of NaCl as an electrolyte. The results showed that up to 500 ppm of Malachite Green can quantitatively be removed (>95%) by CPE procedure in a single extraction using optimum conditions.
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spectrophtometric determination of Malachite Green in fish farming water samples after cloud point extraction using nonionic surfactant triton x 100
Analytica Chimica Acta, 2007Co-Authors: Nahid Pourreza, Sh. ElhamiAbstract:Abstract A novel and sensitive cloud point extraction procedure for the determination of trace amounts of Malachite Green by spectrophotometry was developed. Malachite Green was extracted at pH 2.5 mediated by micelles of nonionic surfactant Triton X-100. The extracted surfactant-rich phase was diluted with ethanol and its absorbance was measured at 630 nm. The effect of different variables such as pH, Triton X-100 concentration, cloud point temperature and time and diverse ions was investigated and optimum conditions were established. The calibration graph was linear in the range of 4–500 ng mL −1 of Malachite Green in the initial solution with r = 0.9996 ( n = 10). Detection limit based on three times the standard deviation of the blank (3S b ) was 1.2 ng mL −1 and the relative standard deviation (R.S.D.) for 20 and 300 ng mL −1 of Malachite Green was 1.48 and 1.13% ( n = 8), respectively. The method was applied to the determination of Malachite Green in different fish farming and river water samples.
