Structural characterization, storage stability, and antioxidant activity of a novel amylose–lycopene inclusion complex

A novel amylose–lycopene (A–L) inclusion complex was developed to increase the antioxidant stability of lycopene. The encapsulation efficiency of the A–L complex was 81.42 ± 0.63% and its complexation index was 17.10 ± 0.01%. The A–L complex appeared as a globular V-type sub-microcrystal with an average diameter of 17.7 ± 0.8 μm. Its proportion of ordered-crystalline structure was 51.46 ± 0.22%. Appearing as a type II crystal (T0: 106.72 ± 0.63°C), the A–L complex had a high gelatinization peak temperature (Tp: 122.43 ± 0.41°C). Compared with the A–L physical mixture (not chemically combined), the A–L inclusion complex protected lycopene against color deterioration and degradation during storage (p < .05). The DPPH· scavenging rate of the A–L complex (23.54 ± 0.80%) was higher than that of the A–L physical mixture (4.97 ± 0.60%) after 4 weeks (p < .01). The A–L complex was effective in enhancing lycopene stability, indicating its prospective pharmaceutical and nutraceutical applications. Novelty impact statement A novel amylose–lycopene inclusion complex proved to be an effective way to encapsulate lycopene. It had a high encapsulation efficiency (81.42 ± 0.63%), appearing as globular V-type submicrocrystal with type II structure. The encapsulation of lycopene by amylose effectively protected lycopene from color deterioration, degradation, and retained 23.54 ± 0.80% of its antioxidant activity after 4 weeks of storage at room temperature.