Hypochlorous acid inactivates oral pathogens and a SARS-CoV-2-surrogate

DOI record: { "DOI": "10.1186/s12903-023-02820-7", "ISSN": [ "1472-6831" ], "URL": "http://dx.doi.org/10.1186/s12903-023-02820-7", "abstract": "<jats:title>Abstract</jats:title><jats:sec>\n <jats:title>Background</jats:title>\n <jats:p>Droplets and aerosols produced during dental procedures are a risk factor for microbial and viral transmission. Unlike sodium hypochlorite, hypochlorous acid (HOCl) is nontoxic to tissues but still exhibits broad microbicidal effect. HOCl solution may be applicable as a supplement to water and/or mouthwash. This study aims to evaluate the effectiveness of HOCl solution on common human oral pathogens and a SARS-CoV-2 surrogate MHV A59 virus, considering the dental practice environment.</jats:p>\n </jats:sec><jats:sec>\n <jats:title>Methods</jats:title>\n <jats:p>HOCl was generated by electrolysis of 3% hydrochloric acid. The effect of HOCl on human oral pathogens, <jats:italic>Fusobacterium nucleatum, Prevotella intermedia, Streptococcus intermedius, Parvimonas micra,</jats:italic> and MHV A59 virus was studied from four perspectives: concentration; volume; presence of saliva; and storage. HOCl solution in different conditions was utilized in bactericidal and virucidal assays, and the minimum inhibitory volume ratio that is required to completely inhibit the pathogens was determined.</jats:p>\n </jats:sec><jats:sec>\n <jats:title>Results</jats:title>\n <jats:p>In the absence of saliva, the minimum inhibitory volume ratio of freshly prepared HOCl solution (45–60 ppm) was 4:1 for bacterial suspensions and 6:1 for viral suspensions. The presence of saliva increased the minimum inhibitory volume ratio to 8:1 and 7:1 for bacteria and viruses, respectively. Applying a higher concentration of HOCl solution (220 or 330 ppm) did not lead to a significant decrease in the minimum inhibitory volume ratio against <jats:italic>S. intermedius</jats:italic> and <jats:italic>P. micra</jats:italic>. The minimum inhibitory volume ratio increases in applications of HOCl solution via the dental unit water line. One week of storage of HOCl solution degraded HOCl and increased the minimum growth inhibition volume ratio.</jats:p>\n </jats:sec><jats:sec>\n <jats:title>Conclusions</jats:title>\n <jats:p>HOCl solution (45–60 ppm) is still effective against oral pathogens and SAR-CoV-2 surrogate viruses even in the presence of saliva and after passing through the dental unit water line. This study indicates that the HOCl solution can be used as therapeutic water or mouthwash and may ultimately reduce the risk of airborne infection in dental practice.</jats:p>\n </jats:sec>", "alternative-id": [ "2820" ], "article-number": "111", "assertion": [ { "group": { "label": "Article History", "name": "ArticleHistory" }, "label": "Received", "name": "received", "order": 1, "value": "22 June 2022" }, { "group": { "label": "Article History", "name": "ArticleHistory" }, "label": "Accepted", "name": "accepted", "order": 2, "value": "15 February 2023" }, { "group": { "label": "Article History", "name": "ArticleHistory" }, "label": "First Online", "name": "first_online", "order": 3, "value": "18 February 2023" }, { "group": { "label": "Declarations", "name": "EthicsHeading" }, "name": "Ethics", "order": 1 }, { "group": { "label": "Ethics approval and consent to participate", "name": "EthicsHeading" }, "name": "Ethics", "order": 2, "value": "Not applicable." }, { "group": { "label": "Consent for publication", "name": "EthicsHeading" }, "name": "Ethics", "order": 3, "value": "Not applicable." }, { "group": { "label": "Competing interests", "name": "EthicsHeading" }, "name": "Ethics", "order": 4, "value": "The authors declare that they have no competing interests." } ], "author": [ { "affiliation": [], "family": "Tazawa", "given": "Kento", "sequence": "first" }, { "affiliation": [], "family": "Jadhav", "given": "Rutuja", "sequence": "additional" }, { "affiliation": [], "family": "Azuma", "given": "Mariane Maffei", "sequence": "additional" }, { "affiliation": [], "family": "Fenno", "given": "J. 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