Poly[2-(3-thienyl)ethyloxy-4-butylsulfonate] sodium salt

López Cabarcos, E., and Sue A. Carter. Macromolecules 38.25 (2005): 10537-10541.

Poly[2-(3thienyl)ethoxy-4-butylsulfonic acid] sodium salt (PTE-BS) is a water-soluble luminescent conjugated polymer. The photoluminescence of PTE-BS can be quenched by using low concentrations of methylviologen (MV), and this effect can be used to develop its application in biosensors for ultra-analytical technologies. It is important to understand how the molecular weight of the polymer and the ionic strength of the medium affect photoluminescence, as these parameters may determine the yield and stability of the final biosensor product.
Poly[2-(3-thienyl)ethoxy-4-butylsulfonic acid] sodium salt with M ≈ 10^6 and M ≈ 5 × 10^3 to prepare aqueous polymer solution,
And PL and absorption measurements were performed according to previously reported methods. A polymer stock solution with a concentration of 1.89 × 10^-3M is usually prepared and then purged with nitrogen for more than 3 hours to prepare the solution for fluorescence and absorption spectrum measurements to 1.89 × 10^-4M. Adjust the ionic strength of the solution to a given value by adding the required amount of salt. Before taking PL measurements, the solution was stirred for approximately 3 min and a new amount of salt was added. Experiments were performed at room temperature (approximately 23°C). Results and Discussion Effect of molecular weight on photoluminescence of PTE-BS. As the molecular weight of the polymer increases, both the absorption and fluorescence broad maxima move toward higher wavelengths. A red shift of the absorption maximum from 405 nm to 425 nm and a red shift of the fluorescence maximum from 512 nm to 557 nm can be observed.

Tran, Tuan Sang, et al. Energy Advances 2.3 (2023): 365-374.

Water-redispersible graphene powders were produced by linking graphene with amphiphilic PTEBS molecules via exfoliation-assisted non-covalent functionalization by utilizing the adsorption of Poly[2-(3-thienyl)ethyloxy-4-butylsulfonate] sodium salt (PTEBS) on the graphene surface. The produced graphene powders were of high quality and easily dispersed in water. The aqueous graphene inks were formulated and demonstrated for printing of flexible conductive circuits, providing excellent conductivity without thermal treatment. The produced PTEBS-interfaced graphene also exhibited excellent ORR electrocatalytic activity via an efficient four-electron reaction pathway, demonstrating its promising potential for green energy applications.
In a typical experiment, 1 g of precursor graphite was added to 100 mL of PTEBS aqueous solution and sonicated at 10 ± 1 °C for 2 h. The mixture was then centrifuged at 2000 rpm for 30 min to precipitate the unexfoliated graphite particles, and the supernatant was collected for further purification. To remove excess free PTEBS molecules from the graphene dispersion, the suspension was subjected to two purification cycles by centrifugation at 20000 rpm for 60 min to precipitate graphene flakes, which were then redispersed in deionized water by sonication for 2 min. The purified graphene suspension was finally freeze-dried to obtain a lightweight, water-redispersible dry graphene powder.

Liu, Mei, Baoxin Li, and Xiang Cui. Talanta 115 (2013): 837-841.

Poly[2-(3-thienyl)ethyloxy-4-butylsulfonate] sodium salt (PTEBS) has intrinsic peroxidase-like activity. As a new type of mimetic peroxidase, PTEBS has the advantages of stability, long life, and high catalytic efficiency. Based on this, a simple, inexpensive, highly sensitive, and selective colorimetric detection method for glucose is reported. The assay is homogeneous and performed in liquid phase, which allows easy automation through standard robotic manipulation of microplates. Considering the advantages of PTEBS, PTEBS is promising as an enzyme mimetic with potential applications in biotechnology and clinical diagnostics.
Glucose detection was performed as follows: (1) 20 μL of 5 mg mL-1 GOx and 200 μL of different concentrations of glucose were incubated in 10 mM PBS buffer (pH 7.4) at 37 1°C for 15 min; (2) 100 μL of 0.5 mM TMB, 50 μL of PTEBS solution, and 630 μL of 0.2 M acetate buffer were added to the above glucose reaction solution; (3) The mixture was incubated at 45 ± 1°C for 10 min and the standard curve was determined. In the control experiment, 5 mM maltose, 5 mM lactose, and 5 mM fructose were used in a similar manner instead of glucose. For glucose determination in serum, samples from a local hospital were first centrifuged at 10,000 rpm for 30 min. Afterwards, the supernatant was diluted 100 times with PBS (10 mM, pH 7.4) for the following work. This diluted serum was then used together with GOx instead of the glucose aqueous solution for the glucose catalytic reaction as described above, and the corresponding absorbance was measured at a wavelength of 652 nm.