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Plasticizer-based and polymer-free ion-selective optodes on cellulose paper
Long Li ; Carlin Thompson ; Xuewei Wang Sensor Actuat. B-Chem.,2024,135925. DOI: 10.1016/j.snb.2024.135925
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Abstract: Paper-based ion-selective optodes (ISOs) allow for low-cost ion measurements using widely accessible optical detectors such as smartphones, representing an attractive analytical platform for medical testing and environmental monitoring. Previously reported paper-based ISOs rely on plasticized PVC membranes or PVC/plasticizer-free adsorption layers containing hydrophobic sensing chemicals. In this paper, we studied a new format of paper-based ISOs, in which a plasticizer phase containing sensing chemicals is deposited onto cellulose paper without using a hydrophobic polymer like PVC. Compared to ISOs without plasticizers and polymers, the plasticizer-based ISOs show much higher pH sensitivity when using chromoionophore I and tetrakis[3,5-bis(trifluoromethyl)phenyl]borate as the sensing chemicals. When the sensing layer further contains a solid ionophore with high molecular rigidity, the plasticizer-based ISOs for cations also exhibit enhanced sensitivity than the plasticizer-free ISOs. However, when the ionophore is a liquid at room temperature or has a long alkyl chain, the plasticizer-based and plasticizer-free ISOs have comparable responses because the ionophore behaves as a pseudo-plasticizer. Compared to ISOs with both plasticizers and polymers, the elimination of hydrophobic polymers like PVC makes inkjet printing more efficient and preserves the capillary action of the porous paper. By using the newly launched Samba cartridge with smaller nozzles, the plasticizer-based and polymer-free optodes for sodium, potassium, and calcium ions are prepared by inkjet printing for the first time. In an example application, the inkjet-printed plasticizer-based and polymer-free ISOs are used for colorimetric measurements of urine calcium.
Keywords: Ionophore ; Ion-selective optode ; Cellulose paper ; Inkjet printing ; Colorimetric
Purchased from AmBeed: 79060-88-1 ; 105560-52-9
CAS No. : | 79060-88-1 | MDL No. : | MFCD00043323 |
Formula : | C32H12BF24Na | Boiling Point : | - |
Linear Structure Formula : | NaB((CF3)2(C6H3))4 | InChI Key : | LTGMONZOZHXAHO-UHFFFAOYSA-N |
M.W : | 886.20 | Pubchem ID : | 23681909 |
Synonyms : |
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Chemical Name : | Sodium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate |
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
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* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
62% | In chloroform; at 35℃; for 24h; | General procedure: A mixture of amino acid ester hydrochloride (1.0 equiv., 100 mg) and sodiumtetrakis [3,5-bis(trifluoromethyl)phenyl] borate (NaBArF) (1.1 equiv.) was added tochloroform (40 mL) in a 100 mL round-bottom flask. This was then stirred at 35 for 24h. The progress of the reaction was monitored by taking an aliquot from the clear solution.The anion exchange reaction was deemed complete when no further precipitation(AgCl) was observed upon addition of an aqueous solution of AgNO3 to the aliquot. Theresulting white precipitate was removed by filtering twice. The solvent of the filtrate wassubjected to rotary evaporation under reduced pressure. The resultant yellow viscoussolid was dried in a vacuum at 45 for two days, to generate the target products. |
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