Transition from the random coil to the flower necklace of a hydrophobically modified pullulan in aqueous solution by changing the degree of substitution

Yang, Jia; Sato, Takahiro

doi:10.1016/j.polymer.2020.123346

Cited by 4 publications

(11 citation statements)

References 38 publications

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“…(a) Fluorescence spectra of pyrene solubilized in a PUL-OSA sample P20DS90 ( c = 0.9 × 10 –3 g/cm 3 ) at different pyrene concentrations and (b) the ratio I 3 / I 1 as a function of DS (including unpublished data for PUL-OSA with DS = 0.38 and 0.58). The solid curve serves as a guide to the eye.…”

Section: Resultsmentioning

confidence: 79%

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Micellar Structure of a Hydrophobically Modified Pullulan in an Aqueous Solution

Yang

Sato

2020

Macromolecules

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Narrow distribution pullulan (PUL) samples with different degrees of polymerization (=142−4540) were reacted with octenyl succinic anhydride (OSA) to obtain a hydrophobically modified pullulan (PUL-OSA). The micellar structure formed by PUL-OSA in 0.05 M aqueous NaCl was investigated by small-angle X-ray scattering (SAXS) and fluorescence from pyrene solubilized in the aqueous PUL-OSA solution. SAXS profiles for PUL-OSA solutions were fitted using the flower necklace model consisting of n c unit flower micelles, and n c values estimated by SAXS were almost consistent with results from fluorescence decay of the solubilized pyrene. The micellar structure of PUL-OSA characterized by SAXS and fluorescence was considerably different from that of the alternating copolymer of sodium maleate and dodecyl vinyl ether, P(MAL/C12), an amphiphilic vinyl polyelectrolyte. The flower necklace of PUL-OSA has smaller unit flower micelles and a larger global dimension than the flower necklace of P(MAL/ C12), probably due to differences in the hydrophobic alkyl chain length and the bulkiness of the backbone chain.

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Section: Resultsmentioning

confidence: 79%

“…The degree of substitution dependence of the micellar structure for PUL-OSA is an interesting issue, which will be investigated in the next study. 34 ■ ASSOCIATED CONTENT * sı Supporting Information…”

Section: ■ Conclusionmentioning

confidence: 99%

Micellar Structure of a Hydrophobically Modified Pullulan in an Aqueous Solution

Yang

Sato

2020

Macromolecules

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“…2 illustrates micelle models proposed for amphiphilic random and alternating copolymers. [14][15][16][17][18]21 The flower micelle consists of loop chains and hydrophobic core formed by hydrophobic groups. It is noted that the contour length shorter than lloop ≡ 1.6q cannot take the loop conformation because of its chain stiffness.…”

Section: Micelle Modelsmentioning

confidence: 99%

“…The loose flower necklace consists of nc unit flower micelles and nl random coil subchains. 21 In what follows, the contour length of the random coil subchain is assumed to be also N0,u for simplicity.…”

Section: Micelle Modelsmentioning

confidence: 99%

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Micellar structure of hydrophobically modified polysaccharides in aqueous solution

Sato

Yang

Terao

2021

Polym J

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This article reviews previous studies on the micellar structure formed by hydrophobically modified polysaccharides in aqueous solutions, by static and dynamic light scattering, small angle X-ray and neutron scattering, and fluorescence from pyrene solubilized in the polymer solution. Those experimental results are consistently explained by the full or loose flower necklace model for pullulan bearing octenyl groups and amylose bearing dodecyl groups, and by the randomly branched polymer model, which is often called as "nanogel," for pullulan bearing cholesteryl groups. We discuss the micellar structures of those hydrophobically modified polysaccharides as well as of an amphiphilic alternating vinyl polymer bearing dodecyl groups, depending on the degree of substitution as well as chemical structures of the hydrophobic moiety and backbone chain.

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Micellar structure of decenyl succinic anhydride modified pullulan with degree of substitution dependence in aqueous solution

Li,

Liu,

Sheng

et al. 2025

Carbohydrate Polymers

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Transition from the random coil to the flower necklace of a hydrophobically modified pullulan in aqueous solution by changing the degree of substitution

Cited by 4 publications

References 38 publications

Micellar Structure of a Hydrophobically Modified Pullulan in an Aqueous Solution

Micellar Structure of a Hydrophobically Modified Pullulan in an Aqueous Solution

Micellar structure of hydrophobically modified polysaccharides in aqueous solution

Micellar structure of decenyl succinic anhydride modified pullulan with degree of substitution dependence in aqueous solution

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