Optical Sensor of Anionic Surfactants Using Solid-Phase Extraction with a Lactone-form Rhodamine B Membrane

Determination of Polyhexamethylene Biguanide Hydrochloride Using a Lactone-Rhodamine B-Based Fluorescence Optode

“…An optode film containing L-RB was prepared as follows. The fabrication method is similar to our previous paper [14][15][16]. Take NPOE (5.0 g) and 24.0 mL of a mixed aqueous solution containing 75.0 µM RB and 1.0 M NaOH in a plastic tube, stir for 24 h at 55 • C, and extract L-RB into the NPOE phase.…”

“…Recently, we have reported an AS-sensitive optode based on a lactone rhodamine B (L-RB) film [15][16][17]. From the results, PHMB is expected to be determined with an optode responding to a hydrophobic anion such as AS, because PHMB will form an ion associate with the hydrophobic anion, and the concentration of the free hydrophobic anion is detected by the AS optode.…”

Development of an Optode Detector for Determination of Anionic Surfactants by Flow Injection Analysis

“…In addition, many toxic organic solvents such as chloroform are often used in the methods. Considering the above, there is a need for a simpler method based on chemical sensors such as ion selective electrodes (ISEs), [9][10][11][12][13][14][15][16] optical sensors (optodes) [17][18][19][20][21][22][23][24][25][26][27][28] and fiber optic sensors 29,30 to measure ASs without the use of toxic organic solvents.…”

“…However, only a few reports on AS optodes have been published so far. [17][18][19] The optode using a 1,2-benzo-7-(diethylamino)-3-(octadecanoylimino) phenoxazine (ETH5294)-based poly(vinyl chloride) (PVC) membrane was used for determination of sodium dodecylbenzenesulfonate (NaDBS) in the range 20 -1000 μmol dm -3 . 17 A cationic surfactant(CS)-optode based on a PVC sensing membrane containing polyurethane, bis(2-ethylhexyl) sebacate, and 2′,7′-dichlorofluorescein octadecylester (DCFOE) was used to determine ASs using CS as a titrant in a microtiter plate reader.…”

A New Microfluidic Polymer Chip with an Embedded Cationic Surfactant Ion-selective Optode as a Detector for the Determination of Cationic Surfactants

“…11,12,[14][15][16][17] On the other hand, ion-selective optical sensor (Optode) membranes are suited for a detector of microfluidic chips, compared with the ISE and the ISFET. [18][19][20][21][22][23][24] From the viewpoints of applications to microfluidic technology, optodes are superior to ISEs because they are not subject to electrical noise, and no contacts to microfluidic chips are required for measurements. Furthermore, no reference electrode is needed for measurements using optodes.…”