The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Jing Wang - One of the best experts on this subject based on the ideXlab platform.

  • occurrences of the typical agricultural non ionic Surfactants tristyrylphenol ethoxylates in cherries cerasus pseudocerasus peaches amygdalus persica and kiwifruit actinidia chinensis and the implications of human exposure in china
    Journal of Agricultural and Food Chemistry, 2019
    Co-Authors: Jie Zhou, Chunmei Li, Zejun Jiang, Lufang Wang, Hang Su, Hui Li, Chao Deng, Qi Wang, Jing Wang
    Abstract:

    Tristyrylphenol ethoxylates (TSPnEOs) are widely used as Non-Ionic Surfactants in pesticide formulations in China. However, limited information is available regarding the occurrences of TSPnEOs in fruits. In this study, 361 fruit samples were collected from the main growing areas in China from 2016 to 2017 and analyzed for TSPnEO contamination using gel permeation chromatography–high-performance liquid chromatography–tandem mass spectrometry. TSPnEOs were detected in all samples, with a total concentration range of 0.5–14786.0 μg/kg (median of 85.0 μg/kg). The total concentrations were significantly but weakly correlated with the residues of acetamiprid (r = 0.119; p < 0.05) and carbendazim (r = −0.170; p < 0.01), suggesting that the TSPnEO residues are probably associated with the use of these pesticides during fruit growth. A risk assessment showed that there were little or no risks to human health. However, the risks to health associated with exposure to TSPnEOs should not be ignored because of their u...

  • Occurrences of the Typical Agricultural Non-Ionic Surfactants Tristyrylphenol Ethoxylates in Cherries (Cerasus pseudocerasus), Peaches (Amygdalus persica), and Kiwifruit (Actinidia chinensis) and the Implications of Human Exposure in China
    2019
    Co-Authors: Jie Zhou, Jing Wang, Zejun Jiang, Lufang Wang, Chao Deng, Qi Wang, Fen Jin
    Abstract:

    Tristyrylphenol ethoxylates (TSPnEOs) are widely used as Non-Ionic Surfactants in pesticide formulations in China. However, limited information is available regarding the occurrences of TSPnEOs in fruits. In this study, 361 fruit samples were collected from the main growing areas in China from 2016 to 2017 and analyzed for TSPnEO contamination using gel permeation chromatography–high-performance liquid chromatography–tandem mass spectrometry. TSPnEOs were detected in all samples, with a total concentration range of 0.5–14786.0 μg/kg (median of 85.0 μg/kg). The total concentrations were significantly but weakly correlated with the residues of acetamiprid (r = 0.119; p < 0.05) and carbendazim (r = −0.170; p < 0.01), suggesting that the TSPnEO residues are probably associated with the use of these pesticides during fruit growth. A risk assessment showed that there were little or no risks to human health. However, the risks to health associated with exposure to TSPnEOs should not be ignored because of their ubiquitousness in fruit samples

  • formulation characterization and pharmacokinetics of morin hydrate niosomes prepared from various non ionic Surfactants
    International Journal of Pharmaceutics, 2013
    Co-Authors: Ayman Y Waddad, Sarra Abbad, Were L L Munyendo, Jing Wang, Jianping Zhou
    Abstract:

    Morin hydrate (MH), a bioflavonoid with antioxidant and anticancer activity as well as the ability to improve the bioavailability of other drugs on their concurrent use. Three differently optimized niosomal formulations using three different Non-Ionic Surfactants (Span 60, Span 80 and Tween 60) were achieved by (L9 (3(4))) Taguchi orthogonal array (TOA). The analysis of TOA revealed that Tween 60 Niosomes had the highest entrapment efficiency (93.4%) compared to other optimized Niosomal formulations (71-79%). In terms of MH remaining %, Tween 60 Niosomes were found to be the most stable (89%) at 4 °C over one month compared to Span 60 (56%) and Span 80 (57%) Niosomes. The release pattern in all Niosomal formulations was found to follow the Weibull model and Tween 60 Niosomes had the highest release rate. The molecular modeling simulation explained the binding of MH to the human serum albumin (HSA) by hydrogen bonds during the in vitro release process. As for the bioavailability, the AUC0-8 showed 1.3-2.7 fold increase compared to the MH solution. Ex vivo images of the excised organs showed that MH could accumulate in brain which indicates that MH-Tween 60 Niosomes might be a possible candidate to deliver hydrophobic drugs and overcome the blood-brain barrier (BBB) penetration.

Anh V Nguyen - One of the best experts on this subject based on the ideXlab platform.

  • comparative validation of the analytical models for the marangoni effect on foam film drainage
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2010
    Co-Authors: Stoyan I Karakashev, Dilyana S Ivanova, Zhana K Angarska, Emil D Manev, Roumen Tsekov, B Radoev, Radomir I Slavchov, Anh V Nguyen
    Abstract:

    Abstract The aim of this paper is to evaluate four of the well-known models for drainage of thin liquid films, containing Non-Ionic Surfactants, by applying them to different types of draining foam films stabilized by either strong or weak Non-Ionic Surfactants. The effect of Non-Ionic Surfactants on the drainage of foam films under different conditions was studied. The following series of Surfactants were employed: (1) methylisobutyl carbinol (MIBC), (2) Dowfroth 200, (3) pentaethyleneglycol monodecyl ether (C 10 E 5 ), (4) pentaethyleneglycol monododecyl ether (C 12 E 5 ), (5) hexaethyleneglycol monododecyl ether (C 12 E 6 ), (6) octaethyleneglycol monododecyl ether (C 12 E 8 ) and (7) tetraethyleneglycol monooctyl ether (C 8 E 4 ). The experimental ‘thickness’ vs ‘time’ dependences were processed with four kinetic models: (1) the model developed by Scheludko on the basis of the Stefan–Reynolds lubrication theory (Scheludko model); (2) the model of Radoev, Dimitrov and Ivanov for foam films confined between partially mobile planar gas–liquid surfaces (RDI model); (3) the model of Ruckenstein and Sharma for foam films with surfaces wrinkled by capillary waves (RSh model); (4) the model of Manev–Tsekov–Radoev for foam films with surfaces corrugated by quasi-stationary inhomogeneities (MTR model). A systematic validation based on the statistical level of uncertainty of the model predictions, as compared to the experimental results was preformed. The test on the model kinetic equations confirmed their validations reported in the literature. In addition, cases in which none of the models is valid were identified as well. Ultimately, it was concluded that thin film drainage is a complex phenomenon, which should be studied further by different experimental techniques and modelling approaches.

  • anomalous thickness variation of the foam films stabilized by weak non ionic Surfactants
    Journal of Colloid and Interface Science, 2009
    Co-Authors: Liguang Wang, Stoyan I Karakashev, Anh V Nguyen
    Abstract:

    The constant thickness (H) of metastable free films of various Non-Ionic surfactant solutions was measured at surfactant concentrations less than the critical micelle concentrations or solubility limits with fixed 5 x 10(-5) M sodium chloride (NaCl) serving as the background electrolyte. The Surfactants include n-pentanol, n-octanol, methyl isobutyl carbinol (MIBC), polypropylene glycol (PPG-400), tetraethylene glycol monooctyl ether (C8E4), and tetraethylene glycol monodecyl ether (C10E4). H was interferometrically measured. For each surfactant in this study, the H-versus-surfactant-concentration curve finds a peak at a concentration around 5 x 10(-6) -1 x 10(-5) M and a valley at a higher concentration. The measured H values were compared to those predicted from the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, which considers solely the contribution from electrostatic double-layer repulsion with van der Waals attraction being neglected in the present work. In determining the double-layer repulsion, the ionic strength was determined from the electrolytic conductivity measurement of the film-forming solutions and the surface potential was estimated from the zeta-potential measurement of air bubbles. It was found that the DLVO theory failed to explain the thickness variance with surfactant concentration, implying that additional non-DLVO attractive forces might be required to explain the experimental results. Finally, the possible origins of these attractive forces were discussed. (C) 2009 Elsevier Inc. All rights reserved.

Jie Zhou - One of the best experts on this subject based on the ideXlab platform.

Carrión Fité, Francisco Javier - One of the best experts on this subject based on the ideXlab platform.

  • Washing wool with Surfactants and a non-toxic solvent microemulsion: influence of water hardness
    2013
    Co-Authors: Carrión Fité, Francisco Javier
    Abstract:

    In this work, detersive power (soil removal) was studied after washing a soiled wool fabric with addition of a non-toxic solvent microemulsion to conventional washing detergent formulations with the aim of improving the performance of the conventional washing. The non-toxic solvent used was dimethyl sulfoxide micro-dispersed with an amphoteric surfactant as emulsifier. The fabric was washed with biodegradable Non-Ionic Surfactants such as an alcohol ethoxylate (AE) with 7 mE.O. and an alkyl polyglucoside with 1.4 glucoside groups (APG). The fabric used was EMPA 107 wool (soiled with standard impurities). The Non-Ionic Surfactants were used separately and in mixture in varying proportions for the washes. Given the large amount of impurities in the wool fabric, sodium carbonate and sodium chloride were used to attain a suitable pH to avoid damaging the wool. The fabric was washed at low temperature with water of different hardness (20º hf, 30º hf and 40º hf). In addition, the sequestering agent DTPMP was used to obtain an improvement of detersive power at the hardness of 40º hfPostprint (published version

  • Washing wool with Surfactants and a non-toxic solvent microemulsion: influence of water hardness
    2013
    Co-Authors: Carrión Fité, Francisco Javier
    Abstract:

    In this work, detersive power (soil removal) was studied after washing a soiled wool fabric with addition of a non-toxic solvent microemulsion to conventional washing detergent formulations with the aim of improving the performance of the conventional washing. The non-toxic solvent used was dimethyl sulfoxide micro-dispersed with an amphoteric surfactant as emulsifier. The fabric was washed with biodegradable Non-Ionic Surfactants such as an alcohol ethoxylate (AE) with 7 mE.O. and an alkyl polyglucoside with 1.4 glucoside groups (APG). The fabric used was EMPA 107 wool (soiled with standard impurities). The Non-Ionic Surfactants were used separately and in mixture in varying proportions for the washes. Given the large amount of impurities in the wool fabric, sodium carbonate and sodium chloride were used to attain a suitable pH to avoid damaging the wool. The fabric was washed at low temperature with water of different hardness (20º hf, 30º hf and 40º hf). In addition, the sequestering agent DTPMP was used to obtain an improvement of detersive power at the hardness of 40º h

  • Effects of non-toxic solvent microemulsion in washing wool
    2013
    Co-Authors: Carrión Fité, Francisco Javier
    Abstract:

    This work studies the detersive power and redeposition of impurities after washing standard wool fabrics with a non-toxic solvent microemulsion added to the conventional washing formulations in order improve the results of conventional washing. The solvent was dimethyl sulfoxide (DMS), emulsified and micro-dispersed with amphoteric surfactant. The fabric was washed using Non-Ionic Surfactants, alcohol ethoxylate (AE-7) with 7 m. E.O. and an alkyl polyglucoside (APG). Detersive power was studied as function of those Surfactants and their differing proportions in mixture. Detersive power was potentiated by addition sodium carbonate and sodium chloride as builders, and it was likewise studied under the influence of the salts with different water hardness used in the tests. A sequestering agent, DTPMP, was used to improve the results for detergency. The tensile strength and burst strength of the wool fabric washed with those Surfactants and the microdispersed DMS with repeated washes was assessed. With those Non-Ionic Surfactants used in the same programmed washing tests, the redeposition of a solid impurity, namely carbon black, during the washing was also studied, and a notable decrease of redeposition was attained with addition of the microemulsified DMS, which was also observed with the additional use of sodium dodecylbenzenesulfonate (LAS). In order to predict the stability of the particles of carbon black and the particles of DMS in the washing bath, the size of those particles was determinedPostprint (published version

  • Effects of non-toxic solvent microemulsion in washing wool
    2013
    Co-Authors: Carrión Fité, Francisco Javier
    Abstract:

    This work studies the detersive power and redeposition of impurities after washing standard wool fabrics with a non-toxic solvent microemulsion added to the conventional washing formulations in order improve the results of conventional washing. The solvent was dimethyl sulfoxide (DMS), emulsified and micro-dispersed with amphoteric surfactant. The fabric was washed using Non-Ionic Surfactants, alcohol ethoxylate (AE-7) with 7 m. E.O. and an alkyl polyglucoside (APG). Detersive power was studied as function of those Surfactants and their differing proportions in mixture. Detersive power was potentiated by addition sodium carbonate and sodium chloride as builders, and it was likewise studied under the influence of the salts with different water hardness used in the tests. A sequestering agent, DTPMP, was used to improve the results for detergency. The tensile strength and burst strength of the wool fabric washed with those Surfactants and the microdispersed DMS with repeated washes was assessed. With those Non-Ionic Surfactants used in the same programmed washing tests, the redeposition of a solid impurity, namely carbon black, during the washing was also studied, and a notable decrease of redeposition was attained with addition of the microemulsified DMS, which was also observed with the additional use of sodium dodecylbenzenesulfonate (LAS). In order to predict the stability of the particles of carbon black and the particles of DMS in the washing bath, the size of those particles was determine

  • Redeposition of impurities on wool fabric during washing with ecological Surfactants and solvent microemulsion
    2011
    Co-Authors: Carrión Fité, Francisco Javier
    Abstract:

    In this work, redeposition performance during washing was studied after washing a wool fabric with addition of a solid impurity. The aim of this paper is to study addition of a non-toxic solvent mircoemulsion to conventional wash formulations with the aim of improving the performance of conventional washing. The non-toxic solvent used was dimethly sulfoxide micro-dispersed with an amphoteric surfactant as emulsifier. The fabric was washed with SDBS and biodegradable Non-Ionic Surfactants such as an alcohol ethoxylate (AE) with 7 m.OE and an alkyl polyglucoside with 1.4 glucoside groups (APG). The fabric used was EMPA 217 wool fabric. The anionic and Non-Ionic Surfactants and mixtures of the non ionic Surfactants were used separately and in mixtures in varying proportions for the washes. Carbon black impurity was used as solid impurity for the washing. Sodium carbonate and sodium chloride were used as builders. The fabric was washed at low temperature (30º) with water of different hardness (20ºhf, 30ºhf,and 40ºhf). In all the cases performance was enhanced, i.e. redeposition of the carbon black solid impurity was decreased, for all the mixtures tested using the DMS mircoemulsion in the washing formulation

Chao Deng - One of the best experts on this subject based on the ideXlab platform.