JP6151003B2 - カンカニクジュヨウから得られる抗糖尿病剤、ヒト又は動物用医薬および機能性食品 - Google Patents
カンカニクジュヨウから得られる抗糖尿病剤、ヒト又は動物用医薬および機能性食品 Download PDFInfo
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- JP6151003B2 JP6151003B2 JP2012237309A JP2012237309A JP6151003B2 JP 6151003 B2 JP6151003 B2 JP 6151003B2 JP 2012237309 A JP2012237309 A JP 2012237309A JP 2012237309 A JP2012237309 A JP 2012237309A JP 6151003 B2 JP6151003 B2 JP 6151003B2
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Description
1.糖尿病患者において食後過血糖に関与する二糖類加水分解酵素(スクラーゼ、マルターゼ)及び/又は
2.糖尿病患者の合併症増悪に関与するアルドース還元酵素
を阻害することを見出した。即ち、カンカニクジュヨウの肉質茎、その抽出液もしくは抽出エキス、又はこれらから単離される化合物の中のあるものを含有させることにより、糖尿病の増悪、合併症の発症を抑制できることを見出し、本発明を完成した。
下記の構造式Aで表される化合物:
前記構造式Aで表される化合物、前記構造式Eで表される化合物、前記構造式Fで表される化合物、前記構造式Gで表される化合物、前記構造式Hで表される化合物、
構造式Aの化合物:ツブロシドA(Tubuloside A)
構造式Bの化合物:カンカノシドK1およびK2(Kankanoside K1およびK2、ただし、カンカノシドK1およびK2は、*で示した炭素の立体異性体)
構造式Cの化合物:カンカノシドL(Kankanoside L)
構造式Dの化合物:ウィデマンニノシドC(Wiedemanninoside C)
構造式Eの化合物:2’−アセチルアクテオシド(2’−Acetylacteoside)
構造式Fの化合物:アクテオシド(Acteoside)
構造式Gの化合物:イソアクテオシド(Isoacteoside)
構造式Hの化合物:エキナコシド(Echinacoside)
構造式Iの化合物:カンプネオシドI(Campneoside I)
構造式Jの化合物:シリンガリド A 3’O−α−L−ラムノピラノシド(Syringalide A 3’ −O−α−L−rhamnopyranoside)
(1)カンカニクジュヨウメタノール抽出エキスの調製
乾燥したカンカニクジュヨウ(C.tubulosa)の肉質茎部を粉砕し、これに約10倍量のメタノールを加え、加熱還流下3時間抽出した。抽出後、ひだ折りろ紙でろ過した後、抽出残渣に再度、前記とほぼ同量のメタノールを加え、3時間加熱還流し、同様にろ過作業を行った。合計3回の抽出を行い、その抽出液をあわせ、ロータリーエバポレーターを用いて、減圧下に溶媒を留去して、カンカニクジュヨウのメタノール抽出エキスを得た。
構造式Aの化合物(ツブロシドA)、構造式Eの化合物(2’−アセチルアクテオシド)、構造式Fの化合物(アクテオシド)、構造式Gの化合物(イソアクテオシド)及び構造式Hの化合物(エキナコシド)は、特許文献1の実施例2の「メタノール抽出エキスの分離及び精製」に記載の方法、条件により単離した。又、構造式Bの化合物(カンカノシドK1およびK2)は、非特許文献5に記載の方法、条件により単離した。構造式Cの化合物(カンカノシドL)は、非特許文献6に記載の方法、条件により単離した。構造式Dの化合物(ウィデマンニノシドC)、構造式Iの化合物(カンプネオシドI)及び構造式Jの化合物(シリンガリド A 3’−O−α−L−ラムノピラノシド)は、非特許文献7に記載の方法、条件により単離した。
実施例1で得られたカンカニクジュヨウのメタノール抽出エキス及び構造式A〜Hのいずれかで表される化合物について、次に示す方法により二糖類加水分解酵素(スクラーゼ、マルターゼ)阻害活性試験を行い、酵素活性の阻害率を算出した。マルターゼ阻害活性についての結果を表1に、スクラーゼ阻害活性についての結果を表2に示す。
基質としてスクロース(74mM)またはマルトース(74mM)溶液50μLに被験サンプル溶液25μLを加え、37℃で5分間予備加温した。酵素液25μLを加えて30分間反応させ、水400μLを加え、沸騰水浴中で5分間加熱し、酵素を失活させた。別に、各被験サンプルにつき酵素液を加えた後、直ちに水を加えて沸騰水浴中で5分間加熱し、酵素を失活させたものをブランクとした。生成したD−グルコースの量をグルコースオキシダーゼ法(グルコースCIIテストワコー)により測定した。基質は0.1Mマレイン酸緩衝液(pH6.0)に溶解し、被験物質はDMSOに溶解した液をマレイン酸緩衝液に添加(DMSOの終濃度2.5%)して用いた。対照群と比較して生成されたD−グルコース濃度から、酵素活性の阻害率を算出した。
Wistar系雄性ラット(体重約150〜350g)の空腸から得られた刷子縁膜を粗酵素として用いた。刷子縁膜は、0.1Mマレイン酸緩衝液(pH6.0)に懸濁し、上記の反応条件で、スクラーゼ阻害試験においては約5mg/dL,マルターゼ阻害試験においては約10mg/dLのD−グルコースが生成する濃度に希釈して用いた。
実施例1で得られたカンカニクジュヨウのメタノール抽出エキス及び構造式A又はE〜Jのいずれかで表される化合物について、次に示す方法によりアルドース還元酵素阻害活性試験を行った。その結果を表3及び表4に示す。
Dufranらの方法[Biochem. Med. 32, 99(1984) ]を一部改変した実験を行った。酵素液としては、ウィスター系雄性ラット(体重約150〜300g)の20匹分のレンズを10mMの2−メルカプトエタノールを含むリン酸緩衝液(135mM、pH7.0)50mL中でホモジネートした後、100000×gで30分間遠心分離し、上清液を用いた。この酵素液は、−20℃以下で凍結保存し、用時解凍し、リン酸緩衝液にて5〜20倍に希釈して用いた。
Claims (4)
- 請求項2に記載の抗糖尿病剤を含有することを特徴とする抗糖尿病用機能性食品。
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