Details

Autor(en) / Beteiligte

• Zhan, Xiao‐Ye
• Wang, Bin
• Yu, Li‐Ping

Titel

Glycidol‐modified polyethylenimine‐capped carbon dots with ultrastable fluorescence for sensitive and selective detection of folic acid in food samples

Ist Teil von

• Journal of the Chinese Chemical Society (Taipei), 2022-03, Vol.69 (3), p.486-496

Ort / Verlag

Weinheim: Wiley‐VCH Verlag GmbH & Co. KGaA

Erscheinungsjahr

2022

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• Glycidol‐modified polyethylenimine (PEI‐OH)‐capped carbon dots (PEI‐OH‐CDs) were prepared and applied for selectively and sensitively detecting folic acid in food samples. PEI‐OH‐CDs were firstly synthesized by a one‐pot hydrothermal method using PEI‐OH and citric acid as precursors, and the transmission electron microscopy characterization reveals that the PEI‐OH‐CDs were of spherical shape with diameters of 2–3 nm and well dispersed in solution. The PEI‐OH‐CDs have high fluorescence and exhibit ultrastrong stability against pH, ion strength, and UV light irradiation. In a wide pH range higher than pH 6, the fluorescence of PEI‐OH‐CDs can be effectively quenched by folic acid through static quenching process and inner filter effect but is not affected by many typical chemicals including cations, anions, amino acids, and vitamins. A good linear relationship was found between the F0/F and the concentration of folic acid in the range from 0.1 to 100 μM, and the detection limit of folic acid is 0.07 μM. The PEI‐OH‐CDs were successfully applied for sensitive determination of folic acid in orange juice, fresh pear, grape spinach, and celery samples at pH 7.2, which is helpful to the stability of folic acid and provides a new strategy for accuracy detection of folic acid in food samples. Novel glycidol‐modified polyethylenimine capped carbon dots (PEI‐OH‐CDs) with high fluorescence were synthesized by a facile one‐pot hydrothermal method using PEI‐OH and citric acid as precursors. The PEI‐OH‐CDs exhibited ultra‐strong stability against harsh conditions and displayed a selective response to folic acid with a low detection limit, which made them excellent fluorescent materials for determining folic acid in food samples.