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Outline
To enhance the stability and bioavailability of astaxanthin (AST), soy protein isolates (SPI) were used as the raw material to prepare SPI/chitosan (CS) composite nanoparticles for the encapsulation of AST. The study investigated the effect of CS on the encapsulation efficiency of AST. Ca2+ were then introduced as stabilizer to investigate their effect on the stability of the SPI/CS/AST nanodispersion and to elucidate the underlying mechanism. The results demonstrated that at a CS concentration of 0.6 mg/mL, the encapsulation efficiency of AST reached 59.57%, representing an 11% increase compared to samples without CS. Under this CS concentration, when Ca2+ was added at 0.2 mg/mL, the AST encapsulation efficiency further rose to 73.55%, a 20% improvement over samples without Ca2+. Moreover, at a storage temperature of 4 ℃, the retention rate of AST increased by 14% with Ca2+ addition. Under ultraviolet irradiation, 0.2 mg/mL Ca2+ provided the most effective protection for AST within the nanodispersion, enhancing retention by 23% compared to those without Ca2+. Furthermore, the retention rates of encapsulated AST in simulated gastric and intestinal fluids reached 78.35% and 67.18%, respectively. Ultraviolet and fluorescence spectroscopy analysis revealed that Ca2+ enhanced stability by influencing hydrogen bonds and hydrophobic interactions in the nanodispersion through ionic bridging, electrostatic neutralization, and conformational regulation. In summary, this study successfully established a highly stable AST nano-delivery system through the synergistic effect of SPI/CS composite wall materials and Ca2+, providing a theoretical basis for the application of AST in the development of functional foods.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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