| Determination of Potassium Ferrocyanide in Foods by Resonance Rayleigh Scattering Method with Double-Charged Triaminotriphenylmethane Dyes |
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| 作者姓名： | 李永丽 刘忠芳 谢锂纱 孔玲 刘绍璞 |
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| 作者单位： | [1]School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China [2]Sichuan Entry-exit Inspection and Quarantine, Chengdu, Sichuan 610041, China |
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| 基金项目： | Project supported by the National Natural Science Foundation of China （No. 20475045） and Scientific Research Foundation of Bureau of Quality and Technical Supervision of China （No. 2005J0095）. |
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| 摘 要： | In pH 1.0 acidic medium, double-charged triaminotriphenylmethane dyes such as methyl green （MEG） and iodine green （IG） react with potassium ferrocyanide to form 2 ： 1 ion-association complexes by virtue of electrostatic forces and hydrophobic interaction. It results in the change of absorption and the great enhancement of resonance Rayleigh scattering （RRS） and the appearance of new RRS spectra. Two systems have similar spectral characteristics and their maximum RRS wavelengths are all located at 276 nm and smaller peaks are located at 332 and 457 nm, respectively. The intensity of RRS is directly proportional to the concentration of Fe（CN）6]^4- in the range of 0.03-5.7 μg·mL^-1 （MeG system） or 0.04-5.9 μg·mL^-1 （IG system）. The RRS method has high sensitivity and the detection limit （3σ） for potassium ferrocyanide is 9.3 ng·mL^-1 （MeG system） or 11.2 ng·mL^-1 （IG system）. The optimum conditions, influencing factors and effects of foreign substances are investigated. The method also has a good selectivity. A sensitive, rapid and simple RRS method for the determination of potassium ferrocyanide in salinized food and table salt has been developed.
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| 关 键 词： | 雷利共振散射 钾氰亚铁酸盐 食物 染色 |
| 修稿时间： | 2006-06-292007-03-27 |
Determination of Potassium Ferrocyanide in Foods by Resonance Rayleigh Scattering Method with Double-Charged Triaminotriphenylmethane Dyes |
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| LI Yong-Lia,LIU Zhong-Fang, XIE Li-Sha,KONG Ling, LIU Shao-Pu.Determination of Potassium Ferrocyanide in Foods by Resonance Rayleigh Scattering Method with Double-Charged Triaminotriphenylmethane Dyes[J].Chinese Journal of Chemistry,2007,25(7):947-952. |
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| Authors: | LI Yong-Lia LIU Zhong-Fang XIE Li-Sha KONG Ling LIU Shao-Pu |
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| Institution: | 1. School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China ;2. Sichuan Entry-exit Inspection and Quarantine, Chengdu, Sichuan 610041, China |
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| Abstract: | In pH 1.0 acidic medium, double‐charged triaminotriphenylmethane dyes such as methyl green (MeG) and iodine green (IG) react with potassium ferrocyanide to form 2:1 ion‐association complexes by virtue of electrostatic forces and hydrophobic interaction. It results in the change of absorption and the great enhancement of resonance Rayleigh scattering (RRS) and the appearance of new RRS spectra. Two systems have similar spectral characteristics and their maximum RRS wavelengths are all located at 276 nm and smaller peaks are located at 332 and 457 nm, respectively. The intensity of RRS is directly proportional to the concentration of Fe(CN)6]4? in the range of 0.03–5.7 µg·mL?1 (MeG system) or 0.04–5.9 µg·mL?1 (IG system). The RRS method has high sensitivity and the detection limit (3σ) for potassium ferrocyanide is 9.3 ng·mL?1 (MeG system) or 11.2 ng·mL?1 (IG system). The optimum conditions, influencing factors and effects of foreign substances are investigated. The method also has a good selectivity. A sensitive, rapid and simple RRS method for the determination of potassium ferrocyanide in salinized food and table salt has been developed. |
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| Keywords: | resonance Rayleigh scattering double-charged triaminotriphenylmethane dye potassium ferrocyanide |
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