This article reviews the current application status and research progress of colorimetric detection methods based on chemical colorimetry in the detection of explosives.It mainly introduced colorimetric sensors,colori...This article reviews the current application status and research progress of colorimetric detection methods based on chemical colorimetry in the detection of explosives.It mainly introduced colorimetric sensors,colorimetric sensor arrays,and chemical colorimetric sensors based on novel material substrates.The application prospect of chemical colorimetric method in the field of explosives detection was prospected.展开更多
Curcuma wenyujin has been widely used as a traditional medicine in China. In this paper a strategy for the quantitative determination of the polysaccharide by a phenol-sulfuric acid method was described. Involved in t...Curcuma wenyujin has been widely used as a traditional medicine in China. In this paper a strategy for the quantitative determination of the polysaccharide by a phenol-sulfuric acid method was described. Involved in three factors, 5% phenol volume, H2SO4 volume, and temperature of water bath, we adopted the L9（3）3 orthogonal array design to gain the optimal colorimetric method. 3.0 ml of polysaccharide solution, 1.0 ml, 5% phenol and 7.0 ml H2SO4 were mixed with constant stirring in a glass vessel, and then kept in a water bath at 40 ℃. After cooling to room temperature for 20 min, the absorbance values were recorded by the UV-2501 PC spectrometer at the wavelength range of 485 nm. The polysaccharide content in Curcuma wenyujin were 3.21%, 3.23%, 3.20%, 3.18~/0, 3.22% and 2.38%, respectively. All results showed that this method was adequate, valid and applicable, may be applied to the determination of other bacterial polysaccharide as well.展开更多
文摘This article reviews the current application status and research progress of colorimetric detection methods based on chemical colorimetry in the detection of explosives.It mainly introduced colorimetric sensors,colorimetric sensor arrays,and chemical colorimetric sensors based on novel material substrates.The application prospect of chemical colorimetric method in the field of explosives detection was prospected.
文摘Curcuma wenyujin has been widely used as a traditional medicine in China. In this paper a strategy for the quantitative determination of the polysaccharide by a phenol-sulfuric acid method was described. Involved in three factors, 5% phenol volume, H2SO4 volume, and temperature of water bath, we adopted the L9（3）3 orthogonal array design to gain the optimal colorimetric method. 3.0 ml of polysaccharide solution, 1.0 ml, 5% phenol and 7.0 ml H2SO4 were mixed with constant stirring in a glass vessel, and then kept in a water bath at 40 ℃. After cooling to room temperature for 20 min, the absorbance values were recorded by the UV-2501 PC spectrometer at the wavelength range of 485 nm. The polysaccharide content in Curcuma wenyujin were 3.21%, 3.23%, 3.20%, 3.18~/0, 3.22% and 2.38%, respectively. All results showed that this method was adequate, valid and applicable, may be applied to the determination of other bacterial polysaccharide as well.
