Abstract
Recent epidemiologic studies have demonstrated a link between the consumption of daily functional fruits rich in phenols and the prevention of disease for neurodegenerative disorders. Hawthorn products are derived from the functional fruit hawthorn, which is rich in phenols and has been used around the world for centuries. In order to explore the phenolic components in hawthorn, the investigation of the ethanol extract led to the separation of five new phenol compounds (1a/1b, 2–4), including one pair of enantiomers (1a/1b), along with seven disclosed analogs (5–11). Their structures were elucidated based on extensive spectroscopic analyses and electronic circular dichroism (ECD). The compounds (1–11) were tested for antioxidant activities by 2,2-diphenyl-1-picrylhydrazyl (DPPH), 2,2′-azino-bis (3-ethylbenzothiazoline-6-sulphonicacid) (ABTS), and ferric reducing antioxidant power (FRAP) methods. Apart from that, monomeric compounds 2, 4, and 6 exhibited more potent protective capabilities against H2O2 (hydrogen peroxide)-induced SH-SY5Y cells. Meanwhile, electronic analyses were performed using the highest occupied molecular orbital (HOMO), and the lowest unoccupied molecular orbital (LUMO) to analyze compounds 2, 4, and 6. Furthermore, compounds (1–11) measured acetylcholinesterase (AChE) inhibitory activities, and 2, 4, and 6 possessed greater AChE inhibitory activity than donepezil. At the same time, molecular docking was used to investigate the possible mechanism of the interaction between active compounds (2, 4, and 6) and AChE.
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Funding
This work was supported by Liaoning Revitalization Talents Program (XLYC2007180), Program for Major Scientific and Medical Technology Problems of China Medicine Education Association in 2020 (2020KTS003), Science and Technology Planning Project of Liaoning Province (2021JH1/10400049), Career Development Support Plan for Young and Middle-aged Teachers in Shenyang Pharmaceutical University (ZQN2018006).
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D. F. Liu, M. Bai, S. J. Song, and X. X. Huang designed the steps of the experiment. D. F. Liu, M. Bai, and R. Guo performed the chemical experiments and analyzed the data. D. F. Liu, N. N. Du, S. Shen, and G. D. Yao performed the pharmacology experiments. Z. Y. Li and X. Zhang performed the molecular modeling part. D. F. Liu drafted the manuscript. M. Bai and X. X. Huang altered some issues in the manuscript. The manuscript was a combination of all authors’ contributions and all authors agreed to its final version.
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Liu, DF., Bai, M., Du, NN. et al. Insight into Isolation and Characterization of Phenolic Compounds from Hawthorn (Crataegus pinnatifida Bge.) with Antioxidant, Anti-Acetylcholinesterase, and Neuroprotective Activities. Plant Foods Hum Nutr 77, 538–544 (2022). https://doi.org/10.1007/s11130-022-01004-y
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DOI: https://doi.org/10.1007/s11130-022-01004-y