The Experts below are selected from a list of 23523 Experts worldwide ranked by ideXlab platform
Colin Charnock - One of the best experts on this subject based on the ideXlab platform.
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Biocidal activity of a bioactive glass–protected, preservative-free tattooing solution
American Journal of Infection Control, 2006Co-Authors: Colin CharnockAbstract:Background The number of people obtaining a tattoo has increased markedly in recent years Tattooing is known to present a risk of transfer of bacterial/fungal pathogens and possibly also viral pathogens. Colorants used for tattooing purposes can be heavily contaminated with bacteria, thus presenting a risk for infections. Concerted efforts are being made to remove this threat, including the production and use of cleaner dyes and pigments with enhanced antimicrobial properties. Methods Challenge tests were used to assess the survival characteristics of bacteria, bacterial endospores, fungal hyphae/spores, and bacteriophage in tattooing Colorants. Results Bacteria were able to grow to high numbers in some Colorants. A recently marketed, preservative-free Colorant was shown to have a good hygienic quality and rapidly inactivated added bacteria and fungal spores. Activity against bacterial endospores was also demonstrated. Bacteriophage survived in the product during the 28-day test period. Conclusion The present study is the first to document the survival characteristics of vegetative bacteria and endospores, fungi, and bacteriophage (as virus surrogate) in tattooing solutions. The results of the present study readily explain the previously reported high numbers of bacteria in some tattooing Colorants. A preservative-free Colorant, which was designed in response to recent recommendations of the European Council with respect to chemical content, was also adequately self-preserving with respect to bacterial and fungal growth.
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Biocidal activity of a bioactive glass-protected, preservative-free tattooing solution.
American Journal of Infection Control, 2006Co-Authors: Colin CharnockAbstract:Background The number of people obtaining a tattoo has increased markedly in recent years Tattooing is known to present a risk of transfer of bacterial/fungal pathogens and possibly also viral pathogens. Colorants used for tattooing purposes can be heavily contaminated with bacteria, thus presenting a risk for infections. Concerted efforts are being made to remove this threat, including the production and use of cleaner dyes and pigments with enhanced antimicrobial properties. Methods Challenge tests were used to assess the survival characteristics of bacteria, bacterial endospores, fungal hyphae/spores, and bacteriophage in tattooing Colorants. Results Bacteria were able to grow to high numbers in some Colorants. A recently marketed, preservative-free Colorant was shown to have a good hygienic quality and rapidly inactivated added bacteria and fungal spores. Activity against bacterial endospores was also demonstrated. Bacteriophage survived in the product during the 28-day test period. Conclusion The present study is the first to document the survival characteristics of vegetative bacteria and endospores, fungi, and bacteriophage (as virus surrogate) in tattooing solutions. The results of the present study readily explain the previously reported high numbers of bacteria in some tattooing Colorants. A preservative-free Colorant, which was designed in response to recent recommendations of the European Council with respect to chemical content, was also adequately self-preserving with respect to bacterial and fungal growth.
Ajoy K Sarkar - One of the best experts on this subject based on the ideXlab platform.
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Study of Natural Colorants as Antibacterial Agents on Natural Fibers
Journal of Natural Fibers, 2009Co-Authors: Ajoy K Sarkar, Renuka DhandapaniAbstract:Cotton and wool substrates were treated with natural Colorants from plants and their antibacterial activity against Staphylococcus aureus and Escherichia coli were evaluated. The studies encompassed qualitative evaluation in terms of zone of inhibition of the treated substrate and quantitative evaluation in terms of percentage reduction in bacteria. Also, the durability of the natural Colorant agent to laundering and exposure to light was determined. Of the six Colorants investigated in this study, the Colorant obtained from pomegranate's bark and rind indicated presence of good antibacterial activity against both gram-positive as well as gram-negative bacteria.
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An evaluation of UV protection imparted by cotton fabrics dyed with natural Colorants
BMC Dermatology, 2004Co-Authors: Ajoy K SarkarAbstract:Background The ultraviolet properties of textiles dyed with synthetic dyes have been widely reported in literature. However, no study has investigated the ultraviolet properties of natural fabrics dyed with natural Colorants. This study reports the Ultraviolet Protection Factor (UPF) of cotton fabrics dyed with Colorants of plant and insect origins. Methods Three cotton fabrics were dyed with three natural Colorants. Fabrics were characterized with respect to fabric construction, weight, thickness and thread count. Influence of fabric characteristics on Ultraviolet Protection Factor was studied. Role of Colorant concentration on the ultraviolet protection factor was examined via color strength analysis. Results A positive correlation was observed between the weight of the fabric and their UPF values. Similarly, thicker fabrics offered more protection from ultraviolet rays. Thread count appears to negatively correlate with UPF. Dyeing with natural Colorants dramatically increased the protective abilities of all three fabric constructions. Additionally, within the same fabric type UPF values increased with higher depths of shade. Conclusion Dyeing cotton fabrics with natural Colorants increases the ultraviolet protective abilities of the fabrics and can be considered as an effective protection against ultraviolet rays. The UPF is further enhanced with Colorant of dark hues and with high concentration of the Colorant in the fabric.
Eunkyung Hwang - One of the best experts on this subject based on the ideXlab platform.
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dyeing and deodorizing properties of cotton silk wool fabrics dyed with amur corktree dryopteris crassirhizoma chrysanthemum boreale artemisia extracts
Journal of Applied Polymer Science, 2010Co-Authors: Younghee Lee, Eunkyung Hwang, Seongkook Do, Young Jin Jung, Hando KimAbstract:This study used four kinds of natural Colorant solutions extracted from Amur Corktree, Dryopteris crassirhizoma, Chrysanthemum boreale, Artemisia using water at 90°C for 90 min with a liquor ratio (solid natural Colorant material/solvent water, weight ratio) of 1/10. The dyeing, color fastness, deodorizing properties of cotton, silk, wool fabrics dyed with natural Colorant extracts were compared. These properties were found to be significantly dependent on the extract concentration, Colorant structure, fabric type. Color fastness (light, water, perspiration fastness) ranged between second and fifth grades and deodorizing performance of fabrics dyed with various natural Colorant extracts between 34 and 99%. It is worth noting that the use of natural Colorants notably enhanced the deodorizing performance. Wool fabrics showed the highest performance increase at 98–99%, followed by silk and cotton. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
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colorimetric assay and antibacterial activity of cotton silk and wool fabrics dyed with peony pomegranate clove coptis chinenis and gallnut extracts
Materials, 2009Co-Authors: Eunkyung HwangAbstract:To investigate the antibacterial functionality of natural Colorant extracts, five kinds of natural dying aqueous solutions were obtained by extraction from peony, pomegranate, clove, Coptis chinensis and gallnut using water at 90 °C for 90 min with a liquor ratio (solid natural Colorant material/water, weight ratio) of 1:10. The colorimetric assay and antibacterial activity of cotton, silk, and wool fabrics dyed with these natural Colorant extracts were examined. It was found that these properties were significantly dependent on the structure of Colorant and the kind of fabrics. The hues (H) of all fabrics dyed with these natural Colorants were in the range of 6.05YR -1.95Y. The order of value (V) was wool, silk and cotton. The chroma (C) of all samples was found to be at very low levels indicating the natural tone. All the fabrics dyed with the five natural Colorants (peony, pomegranate, clove, Coptis chinensis and gallnut) extracts displayed excellent antibacterial activity (reduction rate: 96.8 - 99.9%) against Staphylococcus aureus. However, in the case of Klebsiella pneumoniae, the antibacterial activity was found to depend on the kind of natural Colorant extract used.
Yun-chieh Chen - One of the best experts on this subject based on the ideXlab platform.
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Determining eight Colorants in milk beverages by capillary electrophoresis.
Journal of chromatography. A, 2002Co-Authors: Hsi-ya Huang, Ying-chieh Shih, Yun-chieh ChenAbstract:Milk beverages are popular because of their high nutritional value, and milk products that are enhanced with various fruit flavors are especially in high demand in Asia. Colorants are usually added to fruit flavored milk in order to increase its attraction and appearance, therefore, the detection and measurement of Colorants in this type of beverage are relatively important for health issue reasons. Carminic acid, a natural Colorant, along with tartrazine, Fast green FCF, Brilliant blue FCF, Allura Red AC, Indigo carmine, Sunset yellow FCF, and New coccine, which are seven different synthetic food Colorants, are commonly used as food additives, therefore, this study would focus on the development of an analytical method for the detection of these common Colorants in milk beverages. A high efficiency capillary electrophoresis separation method was finished by a pH 10.0 running buffer containing 7.0 mM beta-cyclodextrin, and the eight Colorants were separated with baseline resolution within 9 min. In order to reduce the matrix interference resulting from the constituents of milk, a suitable polyamide column solid-phase extraction (SPE) was also investigated for milk sample pretreatment. The combination of the simple SPE pretreatment and the fast separation method of capillary electrophoresis, was able to determine successfully without matrix interference the content of these Colorant additives in commercial milk beverages. The recoveries of the eight food Colorants in milk beverages were better than 85% and the detection limits were also lower than 0.5 microg/ml by the developed method.
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Determining eight Colorants in milk beverages by capillary electrophoresis.
Journal of Chromatography A, 2002Co-Authors: Hsi-ya Huang, Ying-chieh Shih, Yun-chieh ChenAbstract:Milk beverages are popular because of their high nutritional value, and milk products that are enhanced with various fruit flavors are especially in high demand in Asia. Colorants are usually added to fruit flavored milk in order to increase its attraction and appearance, therefore, the detection and measurement of Colorants in this type of beverage are relatively important for health issue reasons. Carminic acid, a natural Colorant, along with tartrazine, Fast green FCF, Brilliant blue FCF, Allura Red AC, Indigo carmine, Sunset yellow FCF, and New coccine, which are seven different synthetic food Colorants, are commonly used as food additives, therefore, this study would focus on the development of an analytical method for the detection of these common Colorants in milk beverages. A high efficiency capillary electrophoresis separation method was finished by a pH 10.0 running buffer containing 7.0 mM β-cyclodextrin, and the eight Colorants were separated with baseline resolution within 9 min. In order to reduce the matrix interference resulting from the constituents of milk, a suitable polyamide column solid-phase extraction (SPE) was also investigated for milk sample pretreatment. The combination of the simple SPE pretreatment and the fast separation method of capillary electrophoresis, was able to determine successfully without matrix interference the content of these Colorant additives in commercial milk beverages. The recoveries of the eight food Colorants in milk beverages were better than 85% and the detection limits were also lower than 0.5 μg/ml by the developed method.
Fernanda De Oliveira - One of the best experts on this subject based on the ideXlab platform.
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Biosynthesis of natural Colorant by Talaromyces amestolkiae: Mycelium accumulation and Colorant formation in incubator shaker and in bioreactor
Biochemical Engineering Journal, 2020Co-Authors: Fernanda De Oliveira, Maria Francisca Simas Teixeira, Laura Carmona Ferreira, Álvaro De Baptista Neto, Valeria De Carvalho Santos EbinumaAbstract:Abstract Fungi bioproducts have recently become commercially important to the food and pharmaceutical industry. However, different structural forms exhibited by filamentous fungi throughout their life cycles are often a bottleneck for productivity in many industrial processes. In this work, the relationship among mycelium accumulation, morphology, and Colorant production was evaluated. Experiments were performed in an incubator shaker and in a stirred-tank bioreactor. First, a series of nitrogen sources and pure vitamins were investigated as additives to the monosodium glutamate-glucose medium in order to improve Talaromyces amestolkiae red Colorant production in the incubator shaker. MSG and pH played an important role in generating stress, which affected cell growth and Colorants production. The Colorant synthesis seems to be is triggered under metabolic stress. Next, the effects of starter culture composition (MSG-glucose and nitrogen complex starter media) and airflow (2.0 and 8.0 Lmin−1) were investigated in the bioreactor. After 120 h of cultivation in the bioreactor, a maximum red Colorant production of 9.33 UA500nm, 72.38 % glucose consumption, and 4.53 g L-1 biomass concentration were achieved under complex nitrogen as starter medium at 8 Lmin−1. Growth remained at moderate level, probably affected by the synergistic effect of MSG and pH as stress factors. Moreover, pellets formation favored suitable oxygenation of the culture broth leading to the best consumption of the carbon source.
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Water-soluble fluorescent red Colorant production by Talaromyces amestolkiae.
Applied microbiology and biotechnology, 2019Co-Authors: Fernanda De Oliveira, Danielle Biscaro Pedrolli, Maria Francisca Simas Teixeira, Valéria Carvalho Santos-ebinumaAbstract:The replacement of synthetic colors in food products by natural alternatives has been boosted by consumers willing to pay more for healthier products. However, the success of microbial Colorants depends not only on its acceptability on the market but also its production costs. Talaromyces species can produce water-soluble red Colorants induced by glucose and monosodium glutamate (MSG). In this study, the influence of several conditions was evaluated to produce natural red Colorants by submerged culture of Talaromyces amestolkiae. Under optimal conditions (g/L: glucose 10, MSG 25, MgSO4 0.012, FeSO4 0.01, CaCl2 0.015; and initial pH of 5.0), a 30-fold increase in the production was achieved, reaching a red Colorant production of 13.44 UA500nm. Depending on the initial pH, Colorants with different hues and chroma values were obtained. Deep yellow Colorants were derived from neutral and basic pH, while deep red colors were derived from acidic pH. The fluorescence spectrum of culture broth obtained before and after complexation with salts presented red Colorants with yellow fluorescence spectra. The information generated in this study would be useful for the formulation of industrial media for large-scale cultivation of T. amestolkiae, which have the potential to produce Talaromyces fermented Colorants for use in health foods and pharmaceutics.
