Abstract:A cyclic temperature change model was used to simulate land transportation conditions [30 ℃ (7 h) → 35 ℃ (6 h) → 45 ℃ (5 h) → 55 ℃ (5 h) → 60 ℃ (1 h) → 30 ℃ (7 h)] to investigate the effects of logistics and transportation on the polyphenol contents and antioxidant activities of blueberry, raspberry, and elderberry extracts. The folin-phenol method was used to determine the polyphenol contents in the three berry extracts under different transportation times. Additionally, the 2,2-diphenyl-1-picrylhydrazyl (DPPH) scavenging activity and oxygen radical absorption capacity (ORAC) were used to evaluate the antioxidant activities of the three extracts under different transportation times. The results demonstrate that the initial polyphenol contents of the elderberry, blueberry, and raspberry extracts were 14.96%, 5.11%, and 2.53%, respectively. As the transportation time increased, only the polyphenol content of the elderberry extract increased significantly. Over time, the DPPH· scavenging activities and ORAC of all the three extracts decreased, and the total increased rates of IC50 were all higher than 20%. It is worth noting that the ORAC for all three extracts showed remarkable fluctuations. The total trolox equivalent loss rates of the elderberry, raspberry, and blueberry extracts were 62.76%, 32.74% and 19.72% respectively. The temperature changes and transportation duration times under logistics simulation affected the antioxidant activities of all three berry extracts. The stabilities of the DPPH scavenging activities in ascending order were: raspberry < blueberry < elderberry, while the stabilities of ORAC was blueberry < elderberry < raspberry.
