Details

Autor(en) / Beteiligte

• Feng, Li-Xia
• Tang, Chao
• Han, Xiao-Xuan
• Zhang, Hui-Chao
• Guo, Feng-Na
• Yang, Ting
• Wang, Jian-Hua

Titel

Simultaneous and sensitive detection of multiple small biological molecules by microfluidic paper-based analytical device integrated with zinc oxide nanorods

Ist Teil von

• Talanta (Oxford), 2021-09, Vol.232, p.122499-122499, Article 122499

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2021

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• In this work, ZnO nanorods (ZnO NRs) with different sizes were hydrothermally grown on the surface of Whatman filter paper for the fabrication of a microfluidic paper-based device (μPAD) for the simultaneous detection of glucose and uric acid. As dual enzymatic reaction was employed for the colorimetric detection in this μPAD, the presence of ZnO NRs promoted the enzyme immobilization thus significantly enhancing the colorimetric signal. The coffee ring effect was effectively conquered by the uniform distribution of ZnO NR as well as a specialized double-layered μPAD design. Meanwhile, two color indicators with distinct colors were used to provide complementary results to better quantify the concentration of the analytes by naked eye. As a result, two linear calibration curves were obtained for the detection of glucose (0.01–10 mmol L−1) and uric acid (0.01–5 mmol L−1), along with a LOD of 3 μmol L−1 for glucose and 4 μmol L−1 for uric acid, respectively. The practical usefulness of the proposed μPAD was further validated by the simultaneous analysis of glucose and uric acid in serum samples and urine samples. [Display omitted] •A microfluidic paper-based device (μPAD) for the simultaneous detection of glucose and uric acid was fabricated.•ZnO nanorods were grown in situ on the surface of μPAD using hydrothermal method.•After ZnO nanorods immobilization, the colorimetric signal was significantly enhanced with shorter reaction time.•Both the double-layered µPAD design and the immobilization of ZnO nanorods improved the color uniformity.