Inkjet-printed paper-based colorimetric sensor coupled with smartphone for determination of mercury (Hg2+)

Quantitative pH Determination Based on the Dominant Wavelength Analysis of Commercial Test Strips

“…Particularly, pH imbalance is considered a sign of cancer because most solid malignant tumors with increased glycolysis and insufficient perfusion would produce an acidic extracellular environment, thereby promoting tumor growth, invasion, and metastasis . In addition to the use of commercial pH test strips for pH quantitation, such a platform technology can be adapted for the colorimetric detection of other disease biomarkers/indicators in human urine and serum. − Of course, besides medical diagnosis, its application for the detection of environmental pollutants and food shall be also explored. − With the development of upgraded smartphone cameras (i.e., with improved color depth), we can further improve the sensitivity and accuracy of pH quantification with the Smart-pH-Reader system in order to satisfy pH quantitation in diverse application fields.…”

Nano-functionalized paper-based IoT enabled devices for point-of-care testing: a review

“… 6 (Kaarj et al 2018 ) Wax printing Zika Virus Fluorescence 1 copie/μL Smartphone for image quantification and data analysis. 7 (Monisha et al 2021 ) Inkjet printing Hg +2 Colorimetric 10 μg L −1 Smartphone for image quantification and data analysis. 8 (Franco et al 2021 ) Wax Printing Cu 2+ Colorimetric 0.034 mgL −1 Smartphone for image quantification and data analysis.…”

“…In another work, smart-phone is used for the colorimetric detection of Hg 2+ in an inkjet-printed paper-based sensor modified with silver nanoparticles. The quantitative analysis performed through calculating intensity of Ag NPs through color detector app and smart-phone (Monisha et al 2021 ). In another work, Cu 2+ ion presence was determined in sugar cane spirits through the smart-phone camera, by functionalizing paper-based device by the cuprizone.…”

“…The current decade is the witness of the development of μPADs inbuilt with smart-phones and IoT platform which are frequently used for the point of care testing for human health (Tsagkaris et al 2021 ; Kou et al May 2020 ; Puneeth and Goel 2021 ; Ulep et al 2020 ; Bagal-Kestwal and Chiang 2021 ; Kim et al 2020 ; Huang et al 2021 ; Xu and Yang 2020 ), food and beverages (Guzman et al 2018 ), water quality (Arsawiset and Teepoo 2020 ; da Silva et al 2020 ; Feng et al 2021 ), and heavy metal ions (Wang et al 2020b ; Maruthupandi et al 2020 ; M. de et al 2021 ; Monisha et al 2021 ). Recent progress shows various technical advantages and cost-effectiveness of diagnosing diseases in μPADs, through a smartphone.…”

Rhodamine-Based Fluorescent Probe for Highly Selective Determination of Hg2+

“…To date, many analytic approaches have been employed for sensing Hg 2+ such as high-performance liquid chromatography–inductively coupled plasma mass spectrometry (HPLC–ICP-MS), HPLC coupled with atomic fluorescence spectrometry (HPLC–AFS), ICP-atomic emission spectrometry (ICP-AES), atomic absorption spectrometry (AAS), ultraviolet–visible absorption spectrometry (UV–vis), fluorometry, , electrochemical methods, , and so on. Among all the methods developed, fluorometry possess remarkable advantages because of its high sensitivity, inherent simplicity, instrument operability, in situ detection, and bioimaging analysis in vivo. , Hitherto, many fluorescent probes had been constructed to determine Hg 2+ . − However, some analytical performances of these probes are unsatisfactory, including the slow response time, − cross interference, , poor sensitivity, − and so forth.…”