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Starch retrogradation is a major cause of quality deterioration and shortened shelf life in starch-based foods during storage. This study investigated the effects and mechanisms of soluble soybean polysaccharides (SSPS) with different molecular weights on the retrogradation behavior of potato starch during storage. The changes of gel hardness, water distribution, retrogradation degree, retrogradation kinetics, crystalline structure, and short-range ordered structure during storage were analyzed to understand the impact of different molecular weight SSPS on starch retrogradation. The results showed the addition of three SSPS with different molecular weights significantly reduced the hardness, crystallinity, short-range order, and retrogradation degree of starch gels, and decreased the water migration, and all three SSPS could inhibit the retrogradation of starch gels during storage (P<0.05). Notably, L-SSPS had the strongest ability to inhibit starch retrogradation. L-SSPS inhibited the retrogradation of potato starch gels mainly because L-SSPS had a small molecular weight and short molecular chains, and contained more hydroxyl groups. This allowed it to compete more effectively with starch for water molecules, thereby inhibiting the recrystallization of amylose and amylopectin and retarding the retrogradation process of starch gels. Avrami kinetic analysis revealed that the addition of SSPS reduced the crystallization rate constant k of the starch gel and prolonged the half-retrogradation time t1/2. It provides a scientific basis for the SSPS molecular weight on starch retrogradation behavior, providing theoretical guidance for improving the quality of starch-based foods and extending their shelf life.
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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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