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FOOD CHEMISTRY · 2018 · IF 4.946

Visual determination of malachite green in sea fish samples

Nataliya A. Gavrilenko,Tatyana N. Volgina,Evgeniy V. Pugachev,Mikhail A. Gavrilenko

Polymethylmethacrylate matrix has been developed as an analytical device for visual and spectrophotometric determination of malachite green. Based on the studied effects of different pH levels, temperature, contact time and diverse ions, optimum analysis conditions have been established. For malachite green, the calibration graph was linear in the range of 0.5–30 mg·L −1 in the samples with the detection limit of 1 mg·kg −1 . The proposed simple method makes it possible to determine malachite green visually in the concentration range 8–30 mg·L −1 using a colour scale. The method has been implemented for determination of malachite green in various sea fish samples.

CAS / MDL: 1310-73-2 7647-01-0

研究领域: 分析化学 · 环境科学

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MICROCHIMICA ACTA · 2018 ·Vol. 185 ·期 2 ·1-8 · IF 5.705

Colorimetric and visual determination of Au(III) ions using PEGylated gold nanoparticles

Yang Kunhao,Pan Long,Gong Lingling,Liu Qingju,Li Zhongqiu,Wu Li,He Yujian

A highly selective method is described for the colorimetric determination of Au(III) ions in acidic solution using gold nanoparticles (AuNPs) functionalized with thiolated methoxy poly(ethylene glycol) (mPEG). The presence of Au(III) induces the aggregation of the PEG-AuNPs, and this is accompanied by a color change from wine red to blue, and a decrease in absorbance at 525 nm. This can be monitored spectrophotometrically and visually. Absorbance at 525 nm linearly drops in the 0.50 to 1.75 mg·L −1 Au(III) concentration range, with a 0.25 mg·L −1 detection limit. The method is surprisingly selective over other metal ions. It was successfully applied to the analysis of ore samples. ᅟ

研究领域: 分析化学 · 纳米技术 · 材料科学

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Visual determination of malachite green in sea fish samples

Colorimetric and visual determination of Au(III) ions using PEGylated gold nanoparticles