Antibacterial effects of the plant extracts against bacteria isolated from fingers

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  • 手指から分離した細菌に対する植物抽出液の抗菌効果
  • テサシ カラ ブンリ シタ サイキン ニ タイスル ショクブツ チュウシュツエキ ノ コウキン コウカ

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Abstract

In order to discover the usability of plant extracts as hand-washing agents, their antibacterial effects against bacteria (those isolated from fingers as well as bacteria associated with food poisoning) were investigated by using the following samples: chrysanthemum leaves and Japanese butterbur leaves, which are often discarded; and green tea, the antibacterial effect of which is frequently reported.Regarding any plant extract, the total amount of polyphenols tended to increase as the temperature of the extract increased. The average count of bacteria isolated from fingers turned out to be the total bacteria count of 5.1 × 10² (log/ml 2.2 ± 0.2). The antibacterial test was conducted on the extracts of chrysanthemum leaves, Japanese butterbur leaves and green tea in order to investigate the effects against bacteria isolated from fingers (Staphylococcus capitis 41) and the standard food-poisoning strains of Escherichi coli (E.coli), Staphylococcus aureus (S.aureus) and Staphylococcus capitis subsp.capitis (S.capitis S ). It was discovered that in order to inhibit the growth of E.coli and S.aureus, the total polyphenols are required at least 22.0 mg/ml for both Japanese butterbur leaf and green-tea extract. It was also revealed that in order to inhibit the growth of S.capitis S, polyphenols are required 0.44 mg/ml for the Japanese butterbur leaf extract and 0.22 mg/ml for the green-tea extract. Moreover, it was revealed that both Japanese butterbur leaf and green-tea extract have growth-inhibition effect against all the strains. It was discovered that 0.47 mg/ml or greater polyphenols of Japanese butterbur leaf extract and 1.0 mg/ml or greater polyphenols of green-tea extract can completely inhibit the growth of S.aureus and S.capitis S. The cleansing and sterilization effects of Japanese butterbur leaf and green-tea extract were investigated through the AIP smear test. The result showed that neither extract reached the standard value of 1500RLU at the concentrations of drinking level and 10%.These findings indicate that it is possible to use Japanese butterbur leaf and green-tea extract as handwashing ]agents at the drinking-level concentration.

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