Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Articles Article Faculty Publications -Articles Dublin Core The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/. Title A name given to the resource Smartphone application-based colorimetric fish freshness monitoring using an indicator prepared by rub-coating of red cabbage on paper substrates Subject The topic of the resource Anthocyanins; Fish spoilage monitoring; Halochromic interface; Indicator paper; Smartphone-based detection Description An account of the resource This work developed a simple, easy-to-prepare, and inexpensive indicator (R-Paper) based on rub-coating of red cabbage on readily available paper substrates to detect the freshness of fish in out-of-lab settings. A single-step rub-coating method was used to incorporate anthocyanins on paper substrates, without the extraction of the compound from red cabbage. The preparation of the indicator and its usage is quick and does not require additional chemicals, personnel expertise, or laboratory facilities. The functional colorimetric interface created by directly rubbing red cabbage on paper was used for fish quality monitoring, which displayed a naked-eye detectable color change from purple (for fresh fish) to blue (for spoiling fish) and then to blue-green (for spoiled fish), corresponding to total volatile basic nitrogen (TVB-N) and pH changes. To provide a user-friendly quantitative analysis of this color change, we used the free Android software Color Grab to quantify the color using L*, a*, b*, and RGB indices. To the best of our knowledge, this work is the first report on an indicator prepared by rub-coating red cabbage onto paper-based substrates for fish spoilage monitoring through smartphone-based analysis. To verify that the R-Paper indicator performs on a par with the indicators using extracted anthocyanins, its performance was compared with indicators prepared using anthocyanins extracted from red cabbage (AR-Paper). Naked-eye analysis, simple preparation, ease of use, low cost, and free smartphone-based analysis make the R-Paper indicator an appropriate food quality indicator in resource-limited areas. 2023 Elsevier B.V. Creator An entity primarily responsible for making the resource Chaithra K.P.; Vinod T.P.; Nagarajan P. Source A related resource from which the described resource is derived Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol-679 Publisher An entity responsible for making the resource available Elsevier B.V. Date A point or period of time associated with an event in the lifecycle of the resource 2023-01-01 Identifier An unambiguous reference to the resource within a given context <a href="https://doi.org/10.1016/j.colsurfa.2023.132553" target="_blank" rel="noreferrer noopener">https://doi.org/10.1016/j.colsurfa.2023.132553</a> <br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85174530337&amp;doi=10.1016%2Fj.colsurfa.2023.132553&amp;partnerID=40&amp;md5=364f9f4927d763b7657173cd4e3a082e" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85174530337&amp;doi=10.1016%2fj.colsurfa.2023.132553&amp;partnerID=40&amp;md5=364f9f4927d763b7657173cd4e3a082e</a> Rights Information about rights held in and over the resource Restricted Access Relation A related resource ISSN: 9277757; CODEN: CPEAE Format The file format, physical medium, or dimensions of the resource Online Language A language of the resource English Type The nature or genre of the resource Article Coverage The spatial or temporal topic of the resource, the spatial applicability of the resource, or the jurisdiction under which the resource is relevant Chaithra K.P., Department of Chemistry, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, India; Vinod T.P., Department of Chemistry, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, India; Nagarajan P., Department of Chemistry, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, India