Conformational transition of Poly-L-proline studied by IR, NMR, and SAXS

Shimizu, Shigeru; Takada, Misato; Wada, Kaori; Ikake, Hiroki; Muroga, Yoshio

doi:10.1016/j.polymer.2021.123424

Cited by 1 publication

(1 citation statement)

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“…In Figure 3 a, 3451 cm −1 belongs to the -OH contraction vibration peak, 2995 cm −1 is the contraction vibration peak of the N-H bond, 1653 cm −1 belongs to the stretching vibration of the C=O double bond, 1420 cm −1 belongs to the N-H deformation vibration peak, and 1088 cm −1 belongs to the C-O stretching vibration peak. After adding HAuCl 4 and hydrothermal treatment, the intensity of the transmittance peak of PPRONPs–CDs at 2995 cm −1 , 1420 cm −1 , and 1080 cm −1 decrease, compared to CDs, indicating that the N-H bond and the C-O bond decrease [ 31 ]. The reason for this is because Pro undergoes a polymerization reaction under the oxidation of HAuCl 4 , and the amino group on the heterocyclic ring reacts with the carboxyl group.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Electrochemical Sensing of Indole-3-Acetic Acid and Salicylic Acid on Poly(L-Proline) Nanoparticles–Carbon Dots–Multiwalled Carbon Nanotubes Composite-Modified Electrode

Kuang

Fan

et al. 2022

Sensors

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Sensitive simultaneous electrochemical sensing of phytohormones indole-3-acetic acid and salicylic acid based on a novel poly(L-Proline) nanoparticles–carbon dots composite consisting of multiwalled carbon nanotubes was reported in this study. The poly(L-Proline) nanoparticles–carbon dots composite was facilely prepared by the hydrothermal method, and L-Proline was used as a monomer and carbon source for the preparation of poly(L-Proline) nanoparticles and carbon dots, respectively. Then, the poly(L-Proline) nanoparticles–carbon dots–multiwalled carbon nanotubes composite was prepared by ultrasonic mixing of poly(L-Proline) nanoparticles–carbon dots composite dispersion and multiwalled carbon nanotubes. Scanning electron microscope, transmission electron microscope, Fourier transform infrared spectroscopy, ultraviolet visible spectroscopy, energy dispersive spectroscopy, cyclic voltammetry, electrochemical impedance spectroscopy, and linear sweep voltammetry were used to characterize the properties of the composite. poly(L-Proline) nanoparticles were found to significantly enhance the conductivity and sensing performance of the composite. Under optimal conditions, the composite-modified electrode exhibited a wide linear range from 0.05 to 25 μM for indole-3-acetic acid and from 0.2 to 60 μM for salicylic acid with detection limits of 0.007 μM and 0.1 μM (S/N = 3), respectively. In addition, the proposed sensor was also applied to simultaneously test indole-3-acetic acid and salicylic acid in real leaf samples with satisfactory recovery.

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Section: Resultsmentioning

confidence: 99%