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  blue pigment
By x-ray phase analysis the optimal temperature is established for the spinel formation in the oxide system Co2O3-Fe2O3 at the producing ceramic black-blue pigment and the phases playing the role of basic chromophores.
      
Further study of sources of the imported cobalt-blue pigment used on Jingdezhen porcelain from late 13 to early 15 centuries
      
Amylocyanin, the blue pigment of Streptomyces coelicolor
      
Egyptian Blue, a multicomponent synthetic blue pigment has been recorded in ancient Egypt since the Fourth Dynasty of the Old Kingdom (2600-2480 B.C.).
      
The formation of a blue pigment in the bacterial oxidation of isonicotinic acid
      
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In the Britton-Robinson buffer at pH 4.16 and the 0.5% NaCl solution,bovine serum albumin(BSA)is employed as the original analogue of proteins in wall paintings and the absorptivity at 613 nm is proportional to the concentration of proteins in the range 0~13 mg/L. 34.548 μg,24.962 μg,24.724 μg,23.216 μg and 2.590 μg proteins is detected for 1 mg of black,red,white,green and blue pigments of wall paintings at Dunhuang,respectively. The detection relative standard deviation is 4.3%. The recovery of proteins is...

In the Britton-Robinson buffer at pH 4.16 and the 0.5% NaCl solution,bovine serum albumin(BSA)is employed as the original analogue of proteins in wall paintings and the absorptivity at 613 nm is proportional to the concentration of proteins in the range 0~13 mg/L. 34.548 μg,24.962 μg,24.724 μg,23.216 μg and 2.590 μg proteins is detected for 1 mg of black,red,white,green and blue pigments of wall paintings at Dunhuang,respectively. The detection relative standard deviation is 4.3%. The recovery of proteins is between 96.4% and 105.9%. The effect of experiment conditions,amino and some metal ions interfering to the staining reaction is discussed.It is found that spectrophotometry using bromocresol green is applied to the quantitative determination of proteins in the binding midia of different wall painting pigments of Dunhuang is simple,rapid and sensitive.

在pH=4.16,0.5%NaCl的Britton Robinson缓冲溶液中,以溴甲酚绿(BCG)为蛋白质染色剂,在波长λ= 613nm处,用牛血清白蛋白(BSA)为标准样品绘制工作曲线,测定出含不同颜料的敦煌壁画胶结材料中的蛋白质结 果分别为:黑色颜料34.548μg/mg、红色颜料24.962μg/mg、白色颜料24.724μg/mg、绿色颜料23.216μg/mg和蓝色颜料2.590μg/mg.平行测定的相对标准偏差(RSD)为4.3%,蛋白质的加标回收率为96.4%~105.9%.同时考 察了实验条件对染色反应的影响和金属离子、氨基酸的干扰,发现用溴甲酚绿分光光度法测定敦煌壁画不同颜料胶结 材料中蛋白质含量的方法简单、快速、灵敏度高.

Acid Chrome Blue K(ACBK)was used as a probe of resonance light scattering(RLS)to determine the proteins in the binding material of wall painting pigments.The RLS was generated through the interaction between ACBK and proteins in sodium acetate-acetic acid buffer solution at pH3.96.Bovine serum albu-min(BSA)was used as the standard sample for calibration.A linear relationship between the RLS intensity atλ=345nm and the concentration of BSA was observed in the range of0.136-10.88mg/L.The method was applied to...

Acid Chrome Blue K(ACBK)was used as a probe of resonance light scattering(RLS)to determine the proteins in the binding material of wall painting pigments.The RLS was generated through the interaction between ACBK and proteins in sodium acetate-acetic acid buffer solution at pH3.96.Bovine serum albu-min(BSA)was used as the standard sample for calibration.A linear relationship between the RLS intensity atλ=345nm and the concentration of BSA was observed in the range of0.136-10.88mg/L.The method was applied to the determination of proteins in the binding material of wall painting pigments at Dunhuang.The results for1mg of white,green,blue,brown and red pigments were1.5361,1.5714,1.6801,1.8756and3.2673μg/mg,respectively.The relative standard deviation was3.8%and the recoveries of proteins were in the range of95%-107%.The method is simple,rapid and sensitive.

用酸性铬蓝K(ACBK)为共振光散射探针,对壁画含不同颜料的胶结材料中的蛋白质含量进行了定量测定。在pH3.96乙酸-乙酸钠缓冲溶液条件下,在λ=345nm处,以牛血清白蛋白(BSA)为标准样品绘制工作曲线。测定敦煌壁画中含不同颜料的胶结材料中蛋白质结果分别为:白色颜料1.5361μg/mg;绿色颜料1.5714μg/mg;蓝色颜料1.6801μg/mg;棕色颜料1.8756μg/mg和红色颜料3.2673μg/mg。对BSA测定的线性范围为0.13~10.88mg/L。该方法简单、快速、灵敏度高,平行测定的相对标准偏差(RSD)为3.8%,蛋白质的加标回收率为95%~107%。

 
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