Citation: ZHANG Yuan, ZHAI Jiang-Li, LI Fan-Lin, GUO Ping, YAN Xin. Green Synthesis of Gold Nanoparticles and Their Application in Colorimetric Detection of Vitamin C[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(8): 1041-1049. doi: 10.19756/j.issn.0253-3820.201054 shu

Green Synthesis of Gold Nanoparticles and Their Application in Colorimetric Detection of Vitamin C

Tangshan Normal University, Tangshan Key Laboratory of Green Specialty Chemicals, Tangshan 063000, China

Received Date: 21 January 2020
Revised Date: 29 April 2020

Fund Project: This work was supported by the Science Foundation of Tangshan Normal University (Nos. 2017A02, 2017C05).

Gold nanoparticles (AuNPs) were prepared by reducing HAuCl₄ with pear juice as reducing and protecting agent, which was rapid and environmentally friendly. AuNPs were characterized by scanning electron microscopy (SEM), Fourier Transform Infra-Red (FT-IR) and ultraviolet-visible (UV-Vis) spectroscopy. Compared with AuNPs prepared using citrate sodium as reducing agent, AuNPs synthesized by pear juice were more stable. AuNPs were used for colorimetric detection of vitamin C. When this as-prepared AuNPs mixed with AgNO₃ and vitamin C, AgNO₃ was reduced to Ag by vitamin C and deposited on the surface of AuNPs to form Ag/AuNPs, which was accompanied by a color change, as well as the increase of the Ag/AuNPs peak absorbance at 432 nm monitored by UV-Vis detection. Vitamin C could be analyzed qualitatively by the naked eyes according to the color change and quantitatively by UV-Vis detection. The main factors influencing detection of vitamin C were investigated in detail, including the volume of AgNO₃, the pH value and the incubate time. When the concentration of vitamin C was 0.8 mg/L, the solution could be observed from red to brown with naked eyes. The linear range of vitamin C was from 0.4 mg/L to 40 mg/L and from 40 mg/L to 80 mg/L, the relative standard deviation (RSD) was 1.6% (n=8, C_Vc=8 mg/L) and the limit of detection (LOD) was 0.17 mg/L. This method had good selectivity and specificity and was applied to detect vitamin C in vitamin C tablets with recoveries ranging from 89.5% to 110.0%.
- Pear juice,
- Gold nanoparticles,
- Vitamin C,
- Colorimetric detection
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