Abstract
Due to their low cost, simplicity, and pump-free liquid transport properties, colorimetric assays on paper spots and microfluidic paper-based analytical devices (µPADs) are regarded as useful tools for point-of-care testing (POCT). However, for certain types of colorimetric assays, the “non-transparent” and “white” characters of paper can be a disadvantage. In this work, the possibilities of using cellophane as an alternative platform for colorimetric assays have been investigated. Cellophane is a low cost and easy-to-handle transparent film made of regenerated cellulose. Owing to its hydrophilic character, cellophane-based microfluidic channels fabricated through a print–cut–laminate approach enabled pump-free liquid transport into multiple detection areas, similar to µPADs. In addition, the water absorption characteristics of cellophane allowed the stable immobilization of water-soluble colorimetric indicators without any surface modification or additional reagents. The transparency of cellophane provides possibilities for simple background coloring of the substrates, increasing the dynamic signal range for hue-based colorimetric assays, as demonstrated for two model assays targeting H2O2 (46-fold increase) and creatinine (3.6-fold increase). Finally, a turbidity detection-based protein assay was realized on black background cellophane spots. The lowest limits of detection achieved with the cellophane-based devices were calculated as 7 µM for H2O2, 2.7 mg dL−1 for creatinine, and 3.5 mg dL−1 for protein (human serum albumin).
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The data generated during this study is included in this published article and its supplementary information file. Additional data is available from the corresponding author on reasonable request.
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Acknowledgements
The authors thank Dr. Naoko Iwasawa of Keio University for helpful discussions. Prof. Hiroaki Imai and Dr. Yuki Tokura of Keio University are acknowledged for their support with the measurement of contact angles.
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Shigemori, H., Maejima, K., Shibata, H. et al. Evaluation of cellophane as platform for colorimetric assays on microfluidic analytical devices. Microchim Acta 190, 48 (2023). https://doi.org/10.1007/s00604-022-05622-w
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DOI: https://doi.org/10.1007/s00604-022-05622-w