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Functional Foods in Health and Disease ; 12(9):534-546, 2022.
Article in English | Web of Science | ID: covidwho-2072454


Background: Given the current COVID-19 pandemic, numerous drug development studies are being carried out for the treatment and control of this disease. This study aimed to evaluate the in vitro antiviral potential of Corozo fruit extract (Bactris guineensis) against SARS-CoV-2.Methods: Corozo extract (CE) was prepared from the pulp of mature Corozo fruits. The total content of phenols, flavonoids, and anthocyanins in the extracts was determined using the Folin-Ciocalteu, aluminum chloride, and pH differential methods, respectively. The cytotoxicity on Vero E6 cells was evaluated by MTT assay. Antiviral activity was evaluated by pre-post-treatment using a Colombian isolate of SARS-CoV-2. Viral titer was quantified by plaque assay.Results: Anthocyanin concentration of CE was 144.95 +/- 10.3 mg cyanidin-3-glucoside/L. The cytotoxicity of CE on Vero E6 was lower to 20 % at 15.6 g/L. Corozo extract inhibited SARS-CoV-2 at 15.6, 7.8, 3.9 and 1.9 g/L with inhibition percentages of 88.2%, 84%, 59.6% and 56.3%, respectively.Conclusion: This is the first report on the in vitro antiviral effect of Corozo fruit extract against SARS-CoV-2. Since this is a natural product, proven safe for consumption, in the future and with further studies, it could be considered an important functional food that can be useful in preventing strategies to fight against COVID-19.

Iranian Journal of Microbiology ; 14(3):291-299, 2022.
Article in English | EMBASE | ID: covidwho-1955751


Background and Objectives: SARS-CoV-2 variants of concern (VOC) and interest (VOI) pose a significant threat to public health because the rapid change in the SARS-CoV-2 genome can alter viral phenotypes such as virulence, transmissi-bility and the ability to evade the host response. Hence, SARS-CoV-2 quantification techniques are essential for timely diagnosis and follow-up. Besides, they are vital to understanding viral pathogenesis, antiviral evaluation, and vaccine de-velopment. Materials and Methods: Five isolates of SARS-CoV-2: D614G strain (B.1), three VOC (Alpha, Gamma and Delta), and one VOI (Mu) were used to compare three techniques for viral quantification, plaque assay, median tissue culture infectious dose (TCID) and real-time RT-PCR. 50 Results: Plaque assay showed viral titers between 0.15 ± 0.01×107 and 1.95 ± 0.09×107 PFU/mL while viral titer by TCID 50 assay was between 0.71 ± 0.01×106 to 4.94 ± 0.80×106 TCID /mL for the five SARS-CoV-2 isolates. The PFU/mL titer 50 obtained by plaque and the calculated from TCID assays differed by 0.61 log10, 0.59 log10, 0.59 log10 and 0.96 log10 50 for Alfa, Gamma, Delta, and Mu variants (p≤0.0007), respectively. No differences were observed for the D614G strain. Real-time PCR assay exhibited titers ranging from 0.39 ± 0.001×108 to 3.38 ± 0.04×108 RNA copies/µL for all variants. The relation between PFU/mL and RNA copies/mL was 1:29800 for D614G strain, 1:11700 for Alpha, 1:8930 for Gamma, 1:12500 for Delta, and 1:2950 for Mu. Conclusion: TCID assay was comparable to plaque assay for D614G but not for others SARS-CoV-2 variants. Our data 50 demonstrated a correlation among PFU/mL and E gene RNA copies/µL, units of measure commonly used to quantify the viral load in diagnostic and research fields. The results suggest that the proportion of infectious virions in vitro changes de-pending on the SARS-CoV-2 variant, being Mu, the variant reaching a higher viral titer with fewer viral copies.