期刊
MICROMACHINES
卷 8, 期 4, 页码 -出版社
MDPI AG
DOI: 10.3390/mi8040127
关键词
colorimetry; analyte enrichment; PAD; inkjet printing; 3D-printing
类别
资金
- Japan Society for the Promotion of Science (JSPS) for Young Scientists
- Grants-in-Aid for Scientific Research [16J02832] Funding Source: KAKEN
Insufficient sensitivity is a general issue of colorimetric paper-based analytical devices (PADs) for trace analyte detection, such as metal ions, in environmental water. This paper demonstrates the colorimetric detection of zinc ions (Zn2+) on a paper-based analytical device with an integrated analyte concentration system. Concentration of Zn2+ ions from an enlarged sample volume (1 mL) has been achieved with the aid of a colorimetric Zn2+ indicator (Zincon) electrostatically immobilized onto a filter paper substrate in combination with highly water-absorbent materials. Analyte concentration as well as sample pretreatment, including pH adjustment and interferent masking, has been elaborated. The resulting device enables colorimetric quantification of Zn2+ in environmental water samples (tap water, river water) from a single sample application. The achieved detection limit of 0.53 mu M is a significant improvement over that of a commercial colorimetric Zn2+ test paper (9.7 mu M), demonstrating the efficiency of the developed analyte concentration system not requiring any equipment.
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