JP5909821B2 - ナイシン含有抗菌性組成物 - Google Patents
ナイシン含有抗菌性組成物 Download PDFInfo
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- JP5909821B2 JP5909821B2 JP2012036502A JP2012036502A JP5909821B2 JP 5909821 B2 JP5909821 B2 JP 5909821B2 JP 2012036502 A JP2012036502 A JP 2012036502A JP 2012036502 A JP2012036502 A JP 2012036502A JP 5909821 B2 JP5909821 B2 JP 5909821B2
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- nisin
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- acid
- antibacterial
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Description
なお、ここでのアルキルセルロース類及びヒドロキシアルキルセルロース類から選択されるセルロース誘導体とは、アルキル変性またはヒドロキシアルキル変性のみを行っているセルロース誘導体であり、セルロースの変性の際、異なる2種以上の基を組み合わせて変性を行っているセルロース誘導体、及びアルキル変性あるいはヒドロキシアルキル変性以外の変性を行っているセルロース誘導体は含まない。例えば、ヒドロキシプロピルメチルセルロース(HPMC)のようにヒドロキシアルキル変性とアルキル変性とを組み合わせたセルロース誘導体や、カルボキシメチルセルロース(CMC)のようにカルボキシメチル変性を行ったセルロース誘導体は含まない。
<安定性評価試験(1)>
弱酸性水溶液(McIlvaine 緩衝液pH5.0)にナイシンAを500IU/ml添加し、更に下記の各種試験化合物を0.1質量%になるように添加して均一になるまで攪拌して試験水溶液を得た。この試験水溶液を75℃の過酷条件で恒温槽内に保存し、保存1日後および6日後のナイシンAの残存活性を、ATP測定装置を用いて調べた。ナイシンAの残存活性は、ナイシン高感受性株Micrococcus luteus NBRC13867を供試菌に用い、バイオルミネッセンス法(標的細胞からのATP流出量測定)により供試菌細胞からのATP流出量を測定した。ATP測定は,ルシフェラーゼ反応を応用したATP測定用試薬キット(ルシフェール250,キッコーマン社製)を使用し,ルミテスター C−100(キッコーマン社製)により測定した。結果を表1に示す。配合直後のATP流出量を100とし、保存後のナイシン残存活性(%)を算出した。保存後の数値減少が少ないほどナイシンAの活性が残存しており、弱酸性溶液内での安定性が高いことになる。
試験化合物2:メチルセルロース(MC15、和光純薬社製、(2%,20℃)13〜18mPa・s)
試験化合物3:アルキルグルコシド(Mydol10、花王株式会社製)
試験化合物4:メチオニン(和光純薬社製)
試験化合物5:尿素(和光純薬社製)
試験化合物6:ジメチルスルホキシド(和光純薬社製)
試験化合物7:乳ホエー(市販ヨーグルトから調製)
弱酸性水溶液でナイシンAの安定性に寄与した試験化合物1〜3について、試験化合物の濃度による安定性の違いを確認した。弱酸性水溶液(McIlvaine 緩衝液pH5.0)にナイシンAを500IU/ml添加し、試験化合物1〜3及び比較のため試験化合物4を0.01〜0.1質量%になるように配合し、40℃の加速条件で恒温槽内に保存し、安定性評価(1)と同様の方法で供試菌細胞からのATP流出を測定し、配合直後のATP流出量を100として、ナイシン残存活性を算出した。結果を表2に示す。
セルロース誘導体がナイシン活性(細胞膜損傷)に及ぼす効果を、標的微生物細胞(St. aureus)から溶出したATPの濃度を測定することで評価した。試験は、弱酸性水溶液(McIlvaine 緩衝液pH5.0)にナイシンAを300IU/ml添加し、更に下記の各種試験化合物を0.1質量%になるように添加して均一になるまで攪拌した後、標的微生物細胞(Staphylococcus aureus NBRC12732(黄色ブドウ球菌))と接触させて安定性評価(1)と同様の方法によりATP濃度を測定した。ATP濃度が高いほどナイシン活性が高いことになり、ナイシン活性の増強効果が認められることになる。結果を表3に示す。
HPC2 :ヒドロキシプロピルセルロース(2%,20℃)2.0〜2.9mPa・s
HPC150:ヒドロキシプロピルセルロース(2%,20℃)150〜400mPa・s
MC15 :メチルセルロース(2%,20℃)13〜18mPa・s
MC100 :メチルセルロース(2%,20℃)80〜120mPa・s
HPMC :ヒドロキシプロピルメチルセルロース(和光純薬社製)
CMC :カルボキシメチルセルロースナトリウム(和光純薬社製)
セルロース誘導体がナイシン活性(細胞膜損傷)に及ぼす長期的な効果を、標的微生物細胞(St. aureus)から溶出したATPの濃度を測定することで評価した。試験は、弱酸性水溶液(McIlvaine 緩衝液pH5.0)にナイシンAを500IU/ml添加し、更に下記の各種試験化合物を0.1質量%になるように添加して均一になるまで攪拌した後、4℃及び40℃でそれぞれ22日間保存し、保存後の溶液を標的微生物細胞(Staphylococcus aureus NBRC12732(黄色ブドウ球菌))と接触させて安定性評価(1)と同様の方法によりATP濃度を測定した。ATP濃度が高いほどナイシン活性が高く、ナイシン活性が長期間安定ということになる。結果を表4に示す。
HPC2:ヒドロキシプロピルセルロース(2%,20℃)2.0〜2.9mPa・s
MC15:メチルセルロース(2%,20℃)13〜18mPa・s
HPMC:ヒドロキシプロピルメチルセルロース(和光純薬社製)
CMC :カルボキシメチルセルロースナトリウム(和光純薬社製)
ナイシンにセルロース誘導体及びキレート剤を添加したときのナイシン活性を測定した。弱酸性水溶液(McIlvaine 緩衝液pH5.0)に各種濃度のナイシンA、セルロース誘導体としてヒドロキシプロピルセルロース(HPC)を0.1質量%及びキレート剤としてエチレンジアミン四酢酸二ナトリウム(EDTA)を0.004質量%になるように添加し、Staphylococcus aureus NBRC12732(黄色ブドウ球菌)を供試菌として、最小発育阻止濃度(MIC)を25℃で18時間培養後の培地の混濁にて評価した。ナイシンA以外の添加剤の濃度を固定し、ナイシンAの濃度を変化させたときの、菌が培養されなかったナイシンAの最小濃度をMICとした。表5に結果を示す。
+:わずかだが菌の培養が確認される
−:菌が培養されない
溶血性試験により、人体等に対する安全性を評価した。溶血性試験は、細胞毒性の指標とされる試験法である。溶血活性は、壊れた赤血球細胞から溶出したヘモグロビンを指標として評価した。赤血球細胞は、緬羊保存血液<SHEEP>(日本バイオテスト研究所社製)をリン酸緩衝生理食塩水で洗浄し調製した。各種試験化合物を0.1質量%になるようリン酸緩衝生理食塩水に添加し、ナイシンと赤血球細胞を混合し、37℃で35分間放置後に上清の吸光度(540nm)を測定した。界面活性剤(Triton X-100)を0.2質量%で作用させ赤血球細胞が完全に溶血した時の吸光度を100(%)とした。試験化合物を0.1質量%になるように添加し、ナイシンは100、500、1000IU/mlの濃度で作用させた。結果を表6に示す。なお、エチレンジアミン四酢酸二ナトリウム(EDTA)が添加されている試験におけるEDTAの配合量は、いずれも試験溶液全量に対して0.004質量%である。
ポリオキシエチレンオクチルフェノール(Triton X-100:ナカライテスク社製)
アルキルグルコシド(Mydol10、花王株式会社製)
ヒドロキシプロピルセルロース(HPC、和光純薬社製、20℃:2.0〜2.9mPa・S)
メチルセルロース(MC15、和光純薬社製、20℃:13〜18mPa・S)
EDTA(エチレンジアミン四酢酸二ナトリウム)
上記安定性評価試験(1)と同じ条件で、試験化合物1(HPC)を用い、また対象となる菌としてPropionicbacterium acnes ATCC6919(アクネ菌)を使用し、バイオルミネッセンス法を用いてナイシンの活性を評価した。
この結果より、本発明のナイシン抗菌性組成物はアクネ菌にも活性があり、ニキビ予防もしくは治療薬として利用可能であることが分かった。
弱酸性水溶液(McIlvaine 緩衝液pH5.0)に各種濃度のナイシンA、セルロース誘導体としてヒドロキシプロピルセルロース(HPC)を0.1質量%及びキレート剤としてエチレンジアミン四酢酸二ナトリウム(EDTA)を0.004質量%になるように添加し、Propionicbacterium acnes ATCC6919(アクネ菌)を供試菌として、最小発育阻止濃度(MIC)を25℃で18時間培養後の培地の混濁にて評価した。
ナイシン単独の場合のMICは6.25ug/mL(250IU/mL)であった。これに対し、ナイシンにHPC、EDTAを添加した場合に、MICは0.195ug/mL(7.8IU/mL)となり、ナイシンのアクネ菌に対する効果がHPCおよびEDTAの添加により増強されたことが確認された。
Claims (8)
- (A)成分としてナイシン、(B)成分としてヒドロキシプロピルセルロースを含有することを特徴とするナイシン含有抗菌性組成物。
- (A)成分1質量部に対して(B)成分が0.08〜800000質量部であることを特徴とする請求項1に記載の抗菌性組成物。
- 更に(C)成分としてキレート剤を含有することを特徴とする請求項1又は2に記載の抗菌性組成物。
- (C)成分がカルボン酸型キレート剤であることを特徴とする請求項3に記載の抗菌性組成物。
- (A)成分1質量部に対して(B)成分が0.08〜800000質量部、(C)成分が0.025〜300000質量部であることを特徴とする請求項3又は4に記載の抗菌性組成物。
- 前記抗菌性組成物が液状である、請求項1〜5のいずれか一項に記載の抗菌性組成物。
- 前記抗菌性組成物のpHが3〜7である、請求項6に記載の抗菌性組成物。
- ナイシンの抗菌活性を、ヒドロキシプロピルセルロースを共存させることで増強させる方法。
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