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Dong, Huiling; Zheng, Liming; Yu, Pengjun; Jiang, Qing; Wu, Yan; Huang, Caoxing; Yin, Baishuang
ACS sustainable chemistry & engineering, 01/2020, Volume: 8, Issue: 1Journal Article
Lignin–carbohydrate complexes (LCCs) have shown antioxidant ability to scavenge the individual free radicals in vitro, while little work has been carried out to show if the LCCs can efficiently scavenge the intracellular and endogenous reactive oxygen species (ROS), which are the multiple radicals derived from the reduction of molecular oxygen during the metabolism process. In this work, carbohydrate-rich LCCs from bamboo (LCCs–B-B) and poplar (LCCs–B-P) were isolated according to the classical method, and their antioxidant activities were evaluated by scavenging intracellular ROS in RAW 264.7 cells in vitro and endogenous ROS in zebrafish in vivo. Results from composition analysis show that both LCC preparations possess similar contents of carbohydrate (52.2% and 51.2%) and lignin (44.1% and 47.8%). However, NMR analysis revealed that the LCCs–B-B contain 16.1/100C9 LCCs linkages, higher than that in LCCs–B-P (12.3/100C9). Antioxidant assays indicated that LCCs–B-B exhibited better antioxidant activities for scavenging the individual free radicals. At the cellular and animal model levels, LCCs–B-B also outperformed the performance of LCCs–B-P in scavenging the endogenous ROS in H2O2-stimulated RAW 264.7 cells in vitro and zebrafish in vivo, which may be due to its better ability to prevent the reduction of antioxidant enzyme activity (superoxide dismutase and glutathione peroxidase) in oxidative stress.
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