Food contamination from natural or anthropogenic sources poses severe risks to human health. It is now largely accepted that continuous exposure to low doses of food Toxins such as mycotoxins, phycotoxins can be relat...Food contamination from natural or anthropogenic sources poses severe risks to human health. It is now largely accepted that continuous exposure to low doses of food Toxins such as mycotoxins, phycotoxins can be related to several chronic diseases, including some type of cancer and serious hormonal dysfunctions. Contemporary analytical methods have the sensitivity required for contamination detection and quantification, but direct application of these methods on real samples can be rarely performed because of matrix complexity. Thus, selective analytical methods, relying on intelligent functional materials are needed. Recent years have seen the increasing use of molecular imprinted polymers in contaminant analysis in food because these materials seem to be particularly suitable for applications where analyte selectivity is essential. It offers several advantages to the agrofood industry in areas such as analysis, sensoring, extraction, or preconcentration of components. It has the potential of becoming a tool for acquiring truly simple, rapid, and robust direct measurements.展开更多
A new analytical method using Resacetophenone (RATP) modified SiO2 nanoparticles as solidphase extractant has been developed for the preconcentration of trace amounts of Cu(II) in different water samples. Conditions o...A new analytical method using Resacetophenone (RATP) modified SiO2 nanoparticles as solidphase extractant has been developed for the preconcentration of trace amounts of Cu(II) in different water samples. Conditions of the analysis such as preconcentration factor, effect of pH, sample volume, shaking time, elution conditions and effects of interfering ions for the recovery of analyte were investigated. The adsorption capacity of nanometer SiO2-RATP was found to be 61.50 μmol·g-1 at optimum pH and the detection limit (3σ) was 0.36 μg·L-1. The extractant showed rapid kinetic sorption. The adsorption equilibrium of Cu(II) on nanometer SiO2-RATP was achieved in 15 mins. Adsorbed Cu(II) was easily eluted with 5 mL of 4 M hydrochloric acid. The maximum preconcentration factor was 60. The method was applied for the determination of trace amounts of Cu(II) in various water and food samples.展开更多
文摘Food contamination from natural or anthropogenic sources poses severe risks to human health. It is now largely accepted that continuous exposure to low doses of food Toxins such as mycotoxins, phycotoxins can be related to several chronic diseases, including some type of cancer and serious hormonal dysfunctions. Contemporary analytical methods have the sensitivity required for contamination detection and quantification, but direct application of these methods on real samples can be rarely performed because of matrix complexity. Thus, selective analytical methods, relying on intelligent functional materials are needed. Recent years have seen the increasing use of molecular imprinted polymers in contaminant analysis in food because these materials seem to be particularly suitable for applications where analyte selectivity is essential. It offers several advantages to the agrofood industry in areas such as analysis, sensoring, extraction, or preconcentration of components. It has the potential of becoming a tool for acquiring truly simple, rapid, and robust direct measurements.
文摘A new analytical method using Resacetophenone (RATP) modified SiO2 nanoparticles as solidphase extractant has been developed for the preconcentration of trace amounts of Cu(II) in different water samples. Conditions of the analysis such as preconcentration factor, effect of pH, sample volume, shaking time, elution conditions and effects of interfering ions for the recovery of analyte were investigated. The adsorption capacity of nanometer SiO2-RATP was found to be 61.50 μmol·g-1 at optimum pH and the detection limit (3σ) was 0.36 μg·L-1. The extractant showed rapid kinetic sorption. The adsorption equilibrium of Cu(II) on nanometer SiO2-RATP was achieved in 15 mins. Adsorbed Cu(II) was easily eluted with 5 mL of 4 M hydrochloric acid. The maximum preconcentration factor was 60. The method was applied for the determination of trace amounts of Cu(II) in various water and food samples.
