In this study, the azo red dyes derived from p-n-alkyl aniline by the introduction of different alkyl groups having high solubility in dodecane were synthesized. Results indicated that the elementary properties of red...In this study, the azo red dyes derived from p-n-alkyl aniline by the introduction of different alkyl groups having high solubility in dodecane were synthesized. Results indicated that the elementary properties of red oil inks were 1) non-polarity;2) low viscosity (<3.0 cps);3) specified surface tension (<30 mN/m);4) intensity of visible absorption covering 480 - 540 nm;5) hue close to standard red (CIE(x, y) = 0.67, 0.33). We can conclude that these azo red dyes are applicable for electrowetting displays.展开更多
Food dyes are chemicals either natural or synthetic that were used by humans to give attractive colors to numerous food products. Colorful food products may cause several health-related issues to us because they may b...Food dyes are chemicals either natural or synthetic that were used by humans to give attractive colors to numerous food products. Colorful food products may cause several health-related issues to us because they may be prepared through synthetic food dyes. The color which is intended to attract people to eat is given to them by the use of some artificial food dyes such as Erythrosine, Allura red, Indigostine, Tartrazine, Sunset yellow, etc. These artificial food dyes are synthetic chemicals that can cause numerous health-related problems if they were taken in by individuals more than the limited amount. Artificial food dyes are becoming very common in use in different ways to provide an attractive and soothing color to food products such as sweets, drinks, candies, etc. The food products we consume with very good and attractive colors are not as good for our health as they appear. Here in this study, we are observing the cytological effect of two different synthetic food dyes (Brilliant blue and Sunset yellow) in the root meristem of Salvia hispanica L. (Chia plant) which is a major source of α-linolenic acid, mainly omega 3 fatty acids and dietary fibers found in the seed. For this purpose, germinated seeds of Chia are in the germinator. After the emergence of the young roots, we have given the treatment of the respective dyes of 0.5%, 1%, 1.5% & 2% respectively with a control set. After treatment, the roots were fixed in Carnoy’s fixative and preserved in alcohol for further analysis. When the slides of the treated roots were prepared and analyzed we observed that numerous cytological abnormalities such as (stickiness, fragmentation, bridge, laggards, disorientation, etc.) were there in the root cells and the level of abnormalities are increasing with increasing treatment period due to the exposure of them to respective dyes. These results are enough to conclude that the consumption of these dyes is harmful to the health of humans.展开更多
Pomegranate rind is abundantly available as a waste material. Pomegranate Rind Extract (PRE) can be applied to cotton fabrics for its natural colours, as a mordanting agent and also for imparting certain functional pr...Pomegranate rind is abundantly available as a waste material. Pomegranate Rind Extract (PRE) can be applied to cotton fabrics for its natural colours, as a mordanting agent and also for imparting certain functional properties such as fire retardancy and antimicrobial properties. This paper reviews the feasibility of Pomegranate Rind Extract to improve the functional properties of cellulosic fabrics. Studies show that varying concentrations and higher temperatures that were used to apply the extract on the fabric, resulted in enhanced functional properties. At a particular concentration, the treated fabric showed a 15 times lower burning rate in comparison with the control fabric. Also, antimicrobial efficacy has been observed against Gram-positive and Gram-negative bacteria. Due to the natural colouring material, it can be used as a natural dye on cotton material. The fire retardancy of pomegranate rind extract was tested on jute material under varying alkalinity. Research has indicated that pomegranate rind extract could be used to dye polyamide as well. The rubbing and wash fastness of the finished fabrics is good. The light fastness was fair, and its antibacterial efficiency against tested bacteria was good.展开更多
目的通过高效液相色谱-二极管阵列检测-串联质谱（HPLC-DAD-MS/MS）法结合谱库筛查龙血竭、红花、跌打丸、二十五味珊瑚丸、跌打活血散中21种合成染料（金胺O、金橙Ⅱ、胭脂红等）。方法 7批阳性样品甲醇或乙醇提取液的分析采用Phenomen...目的通过高效液相色谱-二极管阵列检测-串联质谱（HPLC-DAD-MS/MS）法结合谱库筛查龙血竭、红花、跌打丸、二十五味珊瑚丸、跌打活血散中21种合成染料（金胺O、金橙Ⅱ、胭脂红等）。方法 7批阳性样品甲醇或乙醇提取液的分析采用Phenomenon Luna C18色谱柱（250 mm×4.6 mm,5μm）;以乙腈-0.05 mol/L醋酸铵为流动相,梯度洗脱;体积流量1 m L/min;柱温40℃;检测波长400~700 nm。MS分析采用ESI电离源;干燥气温度350℃,体积流量10 L/min;雾化气压力241.3 k Pa;源电压4 k V。结果所有样品均检测出合成染料,谱库匹配度均大于99.8。结论该方法准确快速,可用于中药中合成染料筛查。展开更多
文摘In this study, the azo red dyes derived from p-n-alkyl aniline by the introduction of different alkyl groups having high solubility in dodecane were synthesized. Results indicated that the elementary properties of red oil inks were 1) non-polarity;2) low viscosity (<3.0 cps);3) specified surface tension (<30 mN/m);4) intensity of visible absorption covering 480 - 540 nm;5) hue close to standard red (CIE(x, y) = 0.67, 0.33). We can conclude that these azo red dyes are applicable for electrowetting displays.
文摘Food dyes are chemicals either natural or synthetic that were used by humans to give attractive colors to numerous food products. Colorful food products may cause several health-related issues to us because they may be prepared through synthetic food dyes. The color which is intended to attract people to eat is given to them by the use of some artificial food dyes such as Erythrosine, Allura red, Indigostine, Tartrazine, Sunset yellow, etc. These artificial food dyes are synthetic chemicals that can cause numerous health-related problems if they were taken in by individuals more than the limited amount. Artificial food dyes are becoming very common in use in different ways to provide an attractive and soothing color to food products such as sweets, drinks, candies, etc. The food products we consume with very good and attractive colors are not as good for our health as they appear. Here in this study, we are observing the cytological effect of two different synthetic food dyes (Brilliant blue and Sunset yellow) in the root meristem of Salvia hispanica L. (Chia plant) which is a major source of α-linolenic acid, mainly omega 3 fatty acids and dietary fibers found in the seed. For this purpose, germinated seeds of Chia are in the germinator. After the emergence of the young roots, we have given the treatment of the respective dyes of 0.5%, 1%, 1.5% & 2% respectively with a control set. After treatment, the roots were fixed in Carnoy’s fixative and preserved in alcohol for further analysis. When the slides of the treated roots were prepared and analyzed we observed that numerous cytological abnormalities such as (stickiness, fragmentation, bridge, laggards, disorientation, etc.) were there in the root cells and the level of abnormalities are increasing with increasing treatment period due to the exposure of them to respective dyes. These results are enough to conclude that the consumption of these dyes is harmful to the health of humans.
文摘Pomegranate rind is abundantly available as a waste material. Pomegranate Rind Extract (PRE) can be applied to cotton fabrics for its natural colours, as a mordanting agent and also for imparting certain functional properties such as fire retardancy and antimicrobial properties. This paper reviews the feasibility of Pomegranate Rind Extract to improve the functional properties of cellulosic fabrics. Studies show that varying concentrations and higher temperatures that were used to apply the extract on the fabric, resulted in enhanced functional properties. At a particular concentration, the treated fabric showed a 15 times lower burning rate in comparison with the control fabric. Also, antimicrobial efficacy has been observed against Gram-positive and Gram-negative bacteria. Due to the natural colouring material, it can be used as a natural dye on cotton material. The fire retardancy of pomegranate rind extract was tested on jute material under varying alkalinity. Research has indicated that pomegranate rind extract could be used to dye polyamide as well. The rubbing and wash fastness of the finished fabrics is good. The light fastness was fair, and its antibacterial efficiency against tested bacteria was good.
文摘目的通过高效液相色谱-二极管阵列检测-串联质谱（HPLC-DAD-MS/MS）法结合谱库筛查龙血竭、红花、跌打丸、二十五味珊瑚丸、跌打活血散中21种合成染料（金胺O、金橙Ⅱ、胭脂红等）。方法 7批阳性样品甲醇或乙醇提取液的分析采用Phenomenon Luna C18色谱柱（250 mm×4.6 mm,5μm）;以乙腈-0.05 mol/L醋酸铵为流动相,梯度洗脱;体积流量1 m L/min;柱温40℃;检测波长400~700 nm。MS分析采用ESI电离源;干燥气温度350℃,体积流量10 L/min;雾化气压力241.3 k Pa;源电压4 k V。结果所有样品均检测出合成染料,谱库匹配度均大于99.8。结论该方法准确快速,可用于中药中合成染料筛查。
