期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 67, 期 23, 页码 6614-6624出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.9b00355
关键词
micelles; OSA-modified starch; beta-carotene; encapsulation; structure
资金
- National Key R&D Program of China [2016YFD0400801]
- National Natural Science Foundation of China [31571891, 31801589]
- program of the Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, China
- national first-class discipline program of Food Science and Technology [JUFSTR20180204]
- Riddet Institute, a New Zealand Centre of Research Excellence - Tertiary Education Commission
Self-assembled micelles based on octenyl succinic anhydride (OSA)-modified starch were prepared to enhance the solubility of beta-carotene. The critical micelle concentration (CMC) was lower for OSA-modified starch with a lower molecular weight (Mw) or higher degree of substitution (DS). Above the CMC, OSA-modified starch assembled into spherical micelles with an average hydrodynamic diameter of <20 nm, as determined by dynamic light scattering (DLS). All the radii of gyration (R-g), obtained from Guinier fitting of small-angle X-ray scattering (SAXS) data, were between 3 and 9 nm, and they were positively correlated with the Mw but negatively correlated with both the DS and the starch concentration. beta-Carotene was encapsulated effectively into the starch micelles, and the concentration of beta-carotene in the micelles was positively correlated with the concentration, Mw, and DS of the starch, with a maximum value of 53.14 mu g/mL. The incorporation of beta-carotene enlarged the hydrophobic core and induced a significant increase in the R-g of the micelles determined by SAXS, and it may have also promoted the aggregation of the micelles resulting in a marked increase in the D-h determined by DLS.
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