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Carbon quantum dots originated from chitin nanofibers as a fluorescent chemoprobe for drug sensing
Tina Naghdi,Mojgan Atashi,Hamed Golmohammadi,Iman Saeedi,Mohammad Alanezhad 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-
This paper reports the synthesis of carbon quantum dots (CQDs) from chitin nanofibers (CNFs) as a newcarbon source via microwave assisted-hydrothermal route within three minutes. The FL of as-preparedCQDs can be quenched after addition of Cu2+ ions. However, in the presence of D-Penicillamine (DPA), Cu2+ ions prefer to bind to DPA owing to their high affinity toward DPA and subsequently the FL of CQDs iseffectively recovered. Therefore, here for thefirst time the Cu2+ ion modified CQDs (CQDs-Cu2+) wasutilized as a FL chemoprobe for quantitative determination of DPA in biological and pharmaceuticalsamples with satisfactory results.
Nahid Pourreza,Tina Naghdi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5
Silicon carbide nanoparticles were applied as a new solid phase adsorbent for preconcentration of lead ions. Pb(II) ions are adsorbed on silicon carbide nanoparticles, eluted with nitric acid and determined by flame atomic absorption spectrometry. The solid phase extraction conditions were optimized. The calibration graph was linear in the range of 2–150 ng mL-1 (r = 0.9995) with a detection limit of 0.4 ng mL-1. The relative standard deviation for eight measurements of 20 ng mL-1 of Pb(II) was 1.3%. The adsorption capacity was 156.2 mg g-1of Pb(II). The method was applied to determination of Pb(II) in different samples.
Nahid Pourreza,Tina Naghdi 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.51 No.-
In this paper D-limonene and b-carotene are introduced as two natural products in a dispersive liquid–liquid microextraction (DLLME) method for spectrophotometric determination of b-cyclodextrin (b-CD). Dissolved b-carotene in D-limonene exhibits strong absorption exhibits strong absorption intensity afterperforming. The absorption intensity of the extracted phase is increased in the presence of b-CD due to itsinteraction (complex formation) with b-carotene. This increase in the absorbance of the extracted phaseis related to the b-CD concentration and was utilized as an analytical signal for determination of b-CD. The effect of chemical variables such as pH of the sample solution, nature and volume of dispersivesolvent, volume of extraction solvent and extraction time on the DLLME method was studied andoptimum conditions were established. The calibration curve was linear in the range of 110 4–6 10 3 mol L 1 (r = 0.9956) with a limit of detection 410 5 mol L 1. The relative standard deviation foreight replicate determinations of 110 3 mol L 1 and 510 3 mol L 1 of b-CD was 1.82% and 0.88%respectively. The proposed method was successfully applied to the determination of b-CD in spikedwater and pharmaceutical samples and good recoveries in the range of 94.2–108.0% were obtained.