The Experts below are selected from a list of 180 Experts worldwide ranked by ideXlab platform
Mira Petrovic - One of the best experts on this subject based on the ideXlab platform.
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Application of a colour analyzer in quantitative thin-layer chromatography
Journal of Chromatography A, 1997Co-Authors: Mira Petrovic, Sandra Andrašić, Marija Kaštelan-macan, L. BokićAbstract:Validation of quantitative TLC analysis of test dye samples using a Datacolor 3890 colour analyzer was performed. Chromatograms were recorded in the visible region and the results given were on-plate diffuse reflectance spectra of the chromatographic spot, its lightness, chromaticity and hue. The results showed low total R.S.D. for the determination of reflectance and lightness of the chromatographic spots (0.1-2.8% for low concentration level) with negligible instrumental error (0.01-0.04%). The applicability of the proposed method was tested with the quantitative TLC analysis of diffuse and distorted spots of amino acids obtained on non-homogeneous laboratory-prepared plates. Validation of the results has been made by comparison with image analysis and slit-scanning densitometry. The best results (the lowest R.S.D., detection limit and limit of quantification) were obtained by measuring reflectance with the Datacolor system. Densitometry and image analysis resulted in a lower precision (R.S.D.>10%) and significant instrumental error.
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quantitative chromatographic analysis by color analyzer Datacolor 3890
10th International Symposium: Advances ad Applications of Chromatographyn Industry, 1996Co-Authors: Mira Petrovic, Ljerka Bokic, Sandra Andrasic, Marija KastelanmacanAbstract:Color analyzer Datacolor 3890, orginally designet for textile industry, is a powerful tool in analyzing and quantifying analytes that give colored chromatographic spots. Although many analytes lack conveinient chromatophores, using of numerous post chromatographic chemical reactions results in colored spots that can be easily analyzed.
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Validation of quantitative chromatographic analysis on laboratory-prepared thin layers
Journal of Chromatography A, 1995Co-Authors: Mira Petrovic, Marija Kaštelan-macanAbstract:Validation of the determination of amino acids on laboratory-prepared plates was performed on a mixed natural zeolite and microcrystalline cellulose sorbent. Chromatograms were recorded in the visible region using a Datacolor DC 3890 reflectance spectrometer, Camag Turner Fluorimeter 111 slit-scanning densitometer and Leco 2001 image analyser. The precision, detection limit and limit of quantification for each method were determined. A lower total R.S.D. was obtained by measuring colour remission with the Datacolor system (2.7% for high concentration and 3% for low concentration), with an instrumental R.S.D. of 0.1-0.2%. Densitometry and image analysis resulted in a lower precision, especially at low concentration (total R.S.D. > 10%), with a significant instrumental error. © 1995.
Marija Kaštelan-macan - One of the best experts on this subject based on the ideXlab platform.
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Application of a colour analyzer in quantitative thin-layer chromatography
Journal of Chromatography A, 1997Co-Authors: Mira Petrovic, Sandra Andrašić, Marija Kaštelan-macan, L. BokićAbstract:Validation of quantitative TLC analysis of test dye samples using a Datacolor 3890 colour analyzer was performed. Chromatograms were recorded in the visible region and the results given were on-plate diffuse reflectance spectra of the chromatographic spot, its lightness, chromaticity and hue. The results showed low total R.S.D. for the determination of reflectance and lightness of the chromatographic spots (0.1-2.8% for low concentration level) with negligible instrumental error (0.01-0.04%). The applicability of the proposed method was tested with the quantitative TLC analysis of diffuse and distorted spots of amino acids obtained on non-homogeneous laboratory-prepared plates. Validation of the results has been made by comparison with image analysis and slit-scanning densitometry. The best results (the lowest R.S.D., detection limit and limit of quantification) were obtained by measuring reflectance with the Datacolor system. Densitometry and image analysis resulted in a lower precision (R.S.D.>10%) and significant instrumental error.
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Validation of quantitative chromatographic analysis on laboratory-prepared thin layers
Journal of Chromatography A, 1995Co-Authors: Mira Petrovic, Marija Kaštelan-macanAbstract:Validation of the determination of amino acids on laboratory-prepared plates was performed on a mixed natural zeolite and microcrystalline cellulose sorbent. Chromatograms were recorded in the visible region using a Datacolor DC 3890 reflectance spectrometer, Camag Turner Fluorimeter 111 slit-scanning densitometer and Leco 2001 image analyser. The precision, detection limit and limit of quantification for each method were determined. A lower total R.S.D. was obtained by measuring colour remission with the Datacolor system (2.7% for high concentration and 3% for low concentration), with an instrumental R.S.D. of 0.1-0.2%. Densitometry and image analysis resulted in a lower precision, especially at low concentration (total R.S.D. > 10%), with a significant instrumental error. © 1995.
Xungai Wang - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of TiO2&SiO2 nanoparticles as efficient UV absorbers and their application on wool:
Textile Research Journal, 2016Co-Authors: Mingwen Zhang, Bin Tang, Xungai WangAbstract:Uniform core-shell structured TiO2&SiO2 nanoparticles (NPs) were fabricated by synthesizing TiO2 NPs, which were then coated with shells of SiO2. The structure and optical properties of TiO2&SiO2 NPs were characterized with a transmission electron microscope and a UV/Vis spectrophotometer. The photocatalysis was evaluated by photodegradation of rhodamine B. TiO2&SiO2 NPs were coated onto wool fabrics to improve their photostability. The treated wool fabrics were characterized using scanning electron microscopy. Photoyellowing of treated wool fabrics after exposure to simulated sunlight was evaluated using a Datacolor Spectraflash spectrophotometer. At an application level of 5% o.w.f. of the composite nanoparticles, the treated wool fabrics exhibited considerable photostability. Polydimethylsiloxane was applied as an after-treatment, which provides good fastness to washing. This simple but effective coating could be useful for the development of UV protection methods for various substrates.
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Reducing photoyellowing of wool fabrics with silica coated ZnO nanoparticles
Textile Research Journal, 2014Co-Authors: Mingwen Zhang, Bin Tang, Xungai WangAbstract:Though ZnO nanoparticles (NPs) are an excellent UV absorber, their photocatalytic activity greatly limits the application areas of these particles. Under sunlight exposure, ZnO NPs used as a UV absorber can accelerate the wool yellowing process by generating free radicals. To reduce this photocatalysis effect, a physical barrier has been fabricated by coating the ZnO NPs with a silica layer (ZnO@SiO2), hence providing good UV-shielding with low photocatalytic activity. The structure and optical properties of ZnO and ZnO@SiO2 NPs were characterized by transmission electron microscope (TEM) and UV–Vis spectrum. The photocatalytic activity of ZnO and ZnO@SiO2 NPs was evaluated by photo-degradation of Rhodamine B. The ZnO and ZnO@SiO2 NPs were applied to knitted wool fabrics using the dip coating method. The treated wool fabrics were characterized by a scanning electron microscope (SEM) and the photoyellowing level of treated fabrics after exposure under simulated sunlight was evaluated by a Datacolor Spectra...
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Reducing photoyellowing of wool fabrics with silica coated ZnO nanoparticles
Textile Research Journal, 2014Co-Authors: Mingwen Zhang, Lu Sun, Bin Tang, Xungai WangAbstract:Though ZnO nanoparticles (NPs) are an excellent UV absorber, their photocatalytic activity greatly limits the application areas of these particles. Under sunlight exposure, ZnO NPs used as a UV absorber can accelerate the wool yellowing process by generating free radicals. To reduce this photocatalysis effect, a physical barrier has been fabricated by coating the ZnO NPs with a silica layer (ZnO@SiO2), hence providing good UV-shielding with low photocatalytic activity. The structure and optical properties of ZnO and ZnO@SiO2 NPs were characterized by transmission electron microscope (TEM) and UV-Vis spectrum. The photocatalytic activity of ZnO and ZnO@SiO2 NPs was evaluated by photo-degradation of Rhodamine B. The ZnO and ZnO@SiO2 NPs were applied to knitted wool fabrics using the dip coating method. The treated wool fabrics were characterized by a scanning electron microscope (SEM) and the photoyellowing level of treated fabrics after exposure under simulated sunlight was evaluated by a Datacolor Spectraflash spectrophotometer. The ZnO@SiO2 NPs demonstrated excellent protection of wool against photoyellowing.
Mingwen Zhang - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of TiO2&SiO2 nanoparticles as efficient UV absorbers and their application on wool:
Textile Research Journal, 2016Co-Authors: Mingwen Zhang, Bin Tang, Xungai WangAbstract:Uniform core-shell structured TiO2&SiO2 nanoparticles (NPs) were fabricated by synthesizing TiO2 NPs, which were then coated with shells of SiO2. The structure and optical properties of TiO2&SiO2 NPs were characterized with a transmission electron microscope and a UV/Vis spectrophotometer. The photocatalysis was evaluated by photodegradation of rhodamine B. TiO2&SiO2 NPs were coated onto wool fabrics to improve their photostability. The treated wool fabrics were characterized using scanning electron microscopy. Photoyellowing of treated wool fabrics after exposure to simulated sunlight was evaluated using a Datacolor Spectraflash spectrophotometer. At an application level of 5% o.w.f. of the composite nanoparticles, the treated wool fabrics exhibited considerable photostability. Polydimethylsiloxane was applied as an after-treatment, which provides good fastness to washing. This simple but effective coating could be useful for the development of UV protection methods for various substrates.
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Reducing photoyellowing of wool fabrics with silica coated ZnO nanoparticles
Textile Research Journal, 2014Co-Authors: Mingwen Zhang, Bin Tang, Xungai WangAbstract:Though ZnO nanoparticles (NPs) are an excellent UV absorber, their photocatalytic activity greatly limits the application areas of these particles. Under sunlight exposure, ZnO NPs used as a UV absorber can accelerate the wool yellowing process by generating free radicals. To reduce this photocatalysis effect, a physical barrier has been fabricated by coating the ZnO NPs with a silica layer (ZnO@SiO2), hence providing good UV-shielding with low photocatalytic activity. The structure and optical properties of ZnO and ZnO@SiO2 NPs were characterized by transmission electron microscope (TEM) and UV–Vis spectrum. The photocatalytic activity of ZnO and ZnO@SiO2 NPs was evaluated by photo-degradation of Rhodamine B. The ZnO and ZnO@SiO2 NPs were applied to knitted wool fabrics using the dip coating method. The treated wool fabrics were characterized by a scanning electron microscope (SEM) and the photoyellowing level of treated fabrics after exposure under simulated sunlight was evaluated by a Datacolor Spectra...
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Reducing photoyellowing of wool fabrics with silica coated ZnO nanoparticles
Textile Research Journal, 2014Co-Authors: Mingwen Zhang, Lu Sun, Bin Tang, Xungai WangAbstract:Though ZnO nanoparticles (NPs) are an excellent UV absorber, their photocatalytic activity greatly limits the application areas of these particles. Under sunlight exposure, ZnO NPs used as a UV absorber can accelerate the wool yellowing process by generating free radicals. To reduce this photocatalysis effect, a physical barrier has been fabricated by coating the ZnO NPs with a silica layer (ZnO@SiO2), hence providing good UV-shielding with low photocatalytic activity. The structure and optical properties of ZnO and ZnO@SiO2 NPs were characterized by transmission electron microscope (TEM) and UV-Vis spectrum. The photocatalytic activity of ZnO and ZnO@SiO2 NPs was evaluated by photo-degradation of Rhodamine B. The ZnO and ZnO@SiO2 NPs were applied to knitted wool fabrics using the dip coating method. The treated wool fabrics were characterized by a scanning electron microscope (SEM) and the photoyellowing level of treated fabrics after exposure under simulated sunlight was evaluated by a Datacolor Spectraflash spectrophotometer. The ZnO@SiO2 NPs demonstrated excellent protection of wool against photoyellowing.
L. Bokić - One of the best experts on this subject based on the ideXlab platform.
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Application of a colour analyzer in quantitative thin-layer chromatography
Journal of Chromatography A, 1997Co-Authors: Mira Petrovic, Sandra Andrašić, Marija Kaštelan-macan, L. BokićAbstract:Validation of quantitative TLC analysis of test dye samples using a Datacolor 3890 colour analyzer was performed. Chromatograms were recorded in the visible region and the results given were on-plate diffuse reflectance spectra of the chromatographic spot, its lightness, chromaticity and hue. The results showed low total R.S.D. for the determination of reflectance and lightness of the chromatographic spots (0.1-2.8% for low concentration level) with negligible instrumental error (0.01-0.04%). The applicability of the proposed method was tested with the quantitative TLC analysis of diffuse and distorted spots of amino acids obtained on non-homogeneous laboratory-prepared plates. Validation of the results has been made by comparison with image analysis and slit-scanning densitometry. The best results (the lowest R.S.D., detection limit and limit of quantification) were obtained by measuring reflectance with the Datacolor system. Densitometry and image analysis resulted in a lower precision (R.S.D.>10%) and significant instrumental error.
