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Issue 15, 2018
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Quantitative comparison of three representative staining methods for the development of multichannel colorimetric biochips

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Abstract

Assay staining is an essential step to produce visual signals for the development of colorimetric biochips; it is, therefore, of practical importance to evaluate the conventionally adopted staining methods in terms of their quantitative performance in screening immunoassay biochips. Particularly, we have performed a systematic comparison of the color development speed, sensitivity, response range, and aging effects of three common staining protocols, i.e., gold nanoparticle-catalyzed silver deposition (silver staining), horseradish peroxidase (HRP)-catalyzed oxidation of tetramethylbenzidine (TMB staining), and alkaline phosphatase (ALP)-catalyzed reduction of tetrazolium salt (TAS staining). Our results have revealed that silver staining can afford the best screening performance in terms of sensitivity, response range, and aging effect. In comparison, TMB staining is fast in producing quantitative results (5–10 min). TAS staining can provide easily saturated signals with a low background, which is suitable for semi-quantitative or qualitative on-site applications. More importantly, we have demonstrated that the three staining methods can be adapted to the same biochip to fabricate “multichannel” colorimetric biochips for screening multiple tumor markers simultaneously.

Graphical abstract: Quantitative comparison of three representative staining methods for the development of multichannel colorimetric biochips

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Publication details

The article was received on 15 Feb 2018, accepted on 15 Mar 2018 and first published on 16 Mar 2018


Article type: Paper
DOI: 10.1039/C8AY00356D
Citation: Anal. Methods, 2018,10, 1715-1724
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    Quantitative comparison of three representative staining methods for the development of multichannel colorimetric biochips

    M. Geng, J. He, Y. Li, X. Gao and H. Yu, Anal. Methods, 2018, 10, 1715
    DOI: 10.1039/C8AY00356D

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