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Abstract Title:

Anti-viral and anti-bacterial activities of an extract of blackcurrants (Ribes nigrum L.).

Abstract Source:

Microbiol Immunol. 2012 Dec ;56(12):805-9. PMID: 22985050

Abstract Author(s):

Kazufumi Ikuta, Koichi Hashimoto, Hisatoshi Kaneko, Shuichi Mori, Kazutaka Ohashi, Tatsuo Suzutani

Article Affiliation:

Kazufumi Ikuta

Abstract:

The inhibitory effects of an extract of the blackcurrant (Ribes nigrum L.) against pathogens associated with oral, nasopharyngeal and upper respiratory infectious diseases; namely respiratory syncytial virus (RSV), influenza virus A and B (IFV-A and IFV-B), adenovirus (AdV), herpes simplex virus type 1, Haemophilus influenzae type B, Streptococcus pneumoniae and Streptococcus mutans, were investigated. Less than 1% concentration of extract of blackcurrant inhibited replication of RSV, IFV-A and -B and HSV-1 by over 50% and a 10% extract inhibited adsorption of these viruses onto the cell surface by over 95%. The effects on AdV were much less pronounced; the half minimal inhibitory concentration of AdV replication was 2.54± 0.26, and a 10% concentration of the extract inhibited AdV adsorption on the cell surface by 72.9 ± 3.4%. The antibacterial activities of the blackcurrant were evaluated based on its efficacy as a disinfectant. A 10% extract disinfected 99.8% of H. Influenzae type B and 78.9% of S. pneumoniae in10 min, but had no demonstrable effect against S. mutans. The blackcurrant extract still showed antiviral and antibacterial activities after the pH had been made neutral with sodium hydroxide, suggesting that these activities are not the result of acidic reactions or of components precipitated at aneutral pH. These findings demonstrate the potential of blackcurrant extract as a functional food for oral care.

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