Faculty of Food Science and Nutrition, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia.
Biotechnology Research Institute, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia.
Drug Chem Toxicol. 2021 Sep;44(5):447-457. doi: 10.1080/01480545.2019.1601210. Epub 2019 Apr 25.
A novel nanocomposite film of chitosan/graphene oxide (CHIT/GO)/multi-walled carbon nanotubes (MWCNTs)/gold nanoparticles (AuNPs) was applied to fabricate glassy carbon electrode (CHIT/GO/MWCNTs/AuNPs/GCE) for the determination of Tartrazine (TZ), synthetic dyes in food products. The electrochemical sensors found it to be highly sensitive by combining the signal amplification properties of GO and the excellent electronic and antifouling properties of MWCNTs. The CHIT/GO/MWCNTs/AuNPs/GCE exhibited as superior electron transfer materials and possesses intercalation properties which provide synergistic influence on the increment of the current signals. The optimum conditions were found at pH 7, 30 s, and 0.3 Vs. The modified GCE obtained with a linear response ranging from 10 to 100 mg mL ( = 0.99037) with a sensitivity of 0.018 μA μM. The limit of detection (LOD) and quantification obtained were 1.45 and 4.83 mg mL, respectively. The determination of TZ in spiked samples was reliable with recovery percentage from 94.52 to 109.0%. The developed sensor successfully tested in the determination of TZ analyte in commercial candy, jelly, and soft drinks with acceptable results.
一种新型的壳聚糖/氧化石墨烯（CHIT/GO）/多壁碳纳米管（MWCNTs）/金纳米粒子（AuNPs）纳米复合膜被应用于制备玻碳电极（CHIT/GO/MWCNTs/AuNPs/GCE），用于测定食品中人工合成着色剂柠檬黄（TZ）。电化学传感器通过结合 GO 的信号放大性能和 MWCNTs 的优异电子和抗污性能，发现其具有高度的灵敏度。CHIT/GO/MWCNTs/AuNPs/GCE 作为优良的电子转移材料，具有插层性能，对电流信号的增加产生协同影响。最佳条件为 pH 7、30 s 和 0.3 Vs。修饰后的 GCE 在 10 至 100 mg mL 范围内具有线性响应（ = 0.99037），灵敏度为 0.018 μA μM。检测限（LOD）和定量限分别为 1.45 和 4.83 mg mL。在加标样品中的 TZ 测定结果可靠，回收率在 94.52%至 109.0%之间。该传感器成功地应用于商业糖果、果冻和软饮料中 TZ 分析物的测定，结果令人满意。
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