Anti-microbial agent and anti-microbial composition

Abstract

The present invention relates to an anti-tetanic agent comprising a Sasa extract; an anti-fungal agent comprising a Sasa extract and an organic acid; an anti-viral agent comprising a Sasa extract; an anti-microbial agent comprising Sasa tannin ; and an anti-microbial composition comprising a Sasa extract and an organic acid.

1 . A method for inhibiting a growth of virus, comprising the steps of providing an anti-viral agent comprising Sasa extract in an amount ranging from 1 to 50% by mass as expressed in terms of a solid content of the anti-viral agent and contacting the virus to the anti-viral agent,
 wherein the anti-viral agent comprises an organic acid in an amount of from 0.01 to 5% by mass based on the total mass of the anti-viral agent and said organic acid is selected from the group consisting of malic acid, citric acid, lactic acid, oxalic acid, malonic acid, succinic acid, fumaric acid, acetic acid, benzoic acid, phenyl-acetic acid, salicylic acid and phenols, and   wherein the Sasa extract is prepared by extracting raw leaves or dried leaves of Sasa with water maintained at a temperature ranging from 100 to 180° C. at ordinary pressure or while applying a pressure, or   wherein the Sasa extract is prepared by extracting leaves of  Sasa albo - marginata  in a first extraction at a temperature ranging from 100 to 180° C. for 5 to 30 minutes using a pressurized hot water extraction device to obtain a first extract, separating the first extract from a moisture-containing solid content in a moisture separator, treating the moisture-containing solid content at a temperature ranging from 100 to 200° C. for 5 to 60 minutes in a saturated vapor-heating device, further treating the solid content thus treated in a second extraction at 100 to 180° C. for 5 to 30 minutes using a pressurized hot water extraction device to obtain a second extract and combining the extracts obtained in the first and second extraction steps, or   wherein the Sasa extract is prepared by extracting dried leaves of  Sasa albo - marginata  with water heated to 60 to 100° C. for 30 minutes to 12 hours.   
     
     
         2 . The method of  claim 1 , wherein the virus is herpes virus. 
     
     
         3 . The method of  claim 1 , wherein the virus is influenza virus. 
     
     
         4 . The method of  claim 1 , wherein the virus is corona virus. 
     
     
         5 . The method of  claim 1 , wherein the organic acid is malic acid. 
     
     
         6 . The method of  claim 1 , wherein the anti-viral agent comprises Sasa extract in an amount ranging from 2 to 25% by mass as expressed in terms of the solid content of the anti-viral agent and the organic acid in an amount of from 0.02 to 3% by mass based on the total mass of the anti-viral agent. 
     
     
         7 . The method of  claim 1 , wherein the antiviral agent comprises Sasa extract in an amount ranging from 4 to 15% by mass as expressed in terms of the solid content of the anti-viral agent and the organic acid in an amount of from 0.05 to 1.5% by mass based on the total mass of the anti-viral agent. 
     
     
         8 . The method of  claim 6 , wherein the organic acid is malic acid. 
     
     
         9 . The method of  claim 7 , wherein the organic acid is malic acid.