4.6 Article

Flavonoids of Salvadora persica L. (meswak) and its liposomal formulation as a potential inhibitor of SARS-CoV-2

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RSC ADVANCES
卷 11, 期 22, 页码 13537-13544

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ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra00142f

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This study found that a mixture of 11 flavonoids prepared from the meswak plant extract, along with its liposomal formulation, can effectively inhibit the replication of SARS-CoV-2, almost as well as remdesivir. Additionally, these agents were found to release plant chemicals with antiviral activity in the oral cavity.
Several studies are now underway as a worldwide response for the containment of the COVID-19 outbreak; unfortunately, none of them have resulted in an effective treatment. Salvadora persica L. (Salvadoraceae), commonly known as meswak, is one of the popular plants used by Muslims as an oral hygiene tool. It is documented that the meswak possesses antiviral activity, but no report discusses its use for coronavirus treatment. Herein, a mixture of 11 flavonoids prepared from the aqueous plant extract and its liposomal formulation were shown to inhibit SARS-CoV-2 in an in vitro A549 cell line culture and a RT-PCR test almost as well as the FDA-approved anti-COVID-19 agent, remdesivir. Encapsulation within liposomal formulation led to a highly significant increase in the percentage of inhibition of viral replication from 38.09 +/- 0.83 to 85.56 +/- 1.12% in a flavonoid mixture and its liposomal preparation, respectively, and this figure approached that obtained for remdesivir (91.20 +/- 1.71%). Preliminary tests were also performed, including a total flavonoid assay, a molecular docking study, a 3CL-protease inhibition assay and a cytotoxicity study. It was worthy to find a cheap, readily available, safe natural source for promising anti-SARS-CoV-2 agents, that leak their phytochemicals into the aqueous saliva during regular use as a brushing agent.

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