Macromolecular and thermokinetic properties of a galactomannan from Sophora alopecuroides L. seeds: A study of molecular aggregation
| Autor: | Deshun Li, Xujiao Li, Hui Zhang, Xianbao Sun, Yuxing Kou, Yan Wu, Jun’ai Zhang, Yanfang Liu, Xianda Ma, Rui Guo |
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| Rok vydání: | 2021 |
| Předmět: |
Circular dichroism
Polymers and Plastics Macromolecular Substances Nucleation 02 engineering and technology 010402 general chemistry 01 natural sciences Mannans Microscopy Electron Transmission Carbohydrate Conformation Materials Chemistry Thermal stability Particle Size Thermal analysis Chemistry Circular Dichroism Organic Chemistry Temperature Galactose 021001 nanoscience & nanotechnology Random coil 0104 chemical sciences Amorphous solid Kinetics Chemical engineering Seeds Thermogravimetry Particle-size distribution 0210 nano-technology Sophora Macromolecule |
| Zdroj: | Carbohydrate Polymers. 262:117890 |
| ISSN: | 0144-8617 |
| Popis: | The molecular aggregation of a galactomannan (NSAP-25) from Sophora alopecuroides L. seeds was investigated, where three polydisperse systems were confirmed during particle size analysis, indicating existence of different aggregates composed of random coil chains revealed by circular dichroism. Morphologically, NSAP-25 aggregate of various sizes (200-1200 nm) was possibly multi-stranded and formed by ellipsoid-like particles (20-60 nm) composed of compact coil chain, exhibiting extended amorphous structure with chain-like branches intertwined. Hence, NSAP-25 aggregation was inevitable, which exerted an unignorable effect on augmenting flexibility (β↓, γ↓, α↓ and Lp/ML↓) and compactness (ρ↓, df↑ and C∞↓) of branched random coil chain based on macromolecular analysis, especially when concentration increased. Moreover, it could be relevant to thermokinetic behavior of random nucleation and subsequent growth (A2 model and negative ΔS*) as well as good thermal stability (IPDT, ITS, t0.05, Tm and Tp), thus conferring potential applications for NSAP-25 in food and pharmaceutical industries. |
| Databáze: | OpenAIRE |
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