JP2021530460A - 黄斑変性の予防または治療用の薬学的組成物および健康機能食品 - Google Patents
黄斑変性の予防または治療用の薬学的組成物および健康機能食品 Download PDFInfo
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Abstract
Description
前記エキスの抽出溶媒は、水又はC1〜C4アルコールのうちの少なくとも一つを含むものである組成物。
前記エキスの抽出溶媒は、メタノール又はエタノールのうちの少なくとも一つを含むものである組成物。
前記組成物は、バナバ葉エキス及びグアバ葉エキスを含む組成物。
前記エキスの抽出溶媒は、水またはC1〜C4アルコールのうちの少なくとも一つを含むものである健康機能食品。
前記エキスの抽出溶媒は、メタノール又はエタノールのうちの少なくとも一つを含むものである健康機能食品。
前記健康機能食品は、バナバ葉エキス及びグアバ葉エキスを含む健康機能食品。
1.グアバ葉エキスの製造
乾燥されたグアバ葉の粉末(100%、インド産)はPHYTOTECH EXTRACTS PVT LTDから購入した。乾燥された粉末は、100℃の蒸留水に100g/1Lの割合で2時間抽出した。抽出された濃縮液はフィルタリングし、ロータリーエバポレーターを用いて濃縮した後、凍結乾燥して本発明のグアバ葉エキスを製造した。
乾燥されたバナバ葉の粉末(100%、インドネシア産)は、サンボ食品社から購入した。乾燥された粉末は、100g/1Lの割合で酒精抽出した。抽出された濃縮液はフィルタリングし、ロータリーエバポレーターを用いて濃縮した後、凍結乾燥して本発明のバナバ葉エキスを製造した。
前記のグアバ葉エキスとバナバ葉エキスを1:1の重量比で混合して混合物を得た。
実施例2.各エキス及びそれらの混合物の青色光に対するA2E光酸化抑制能の分析
1.各エキス及び混合物の青色光に対するA2E光酸化抑制能の分析
(1)実験方法
A2E(100μM最終濃度)100μLを96−ウェルプレートに加えた後、前記プレートの溶液に、対照群(control)またはグアバ葉エキス、バナバ葉エキス、混合物(最終濃度50、100μg/ml)を蒸留水に溶かし、それぞれ100μLずつ添加した。
図1を参照すると、サンプルを処理していない対照群(CTL)は、青色光を照射した時間によってA2Eが酸化され、酸化されていないA2Eの量が1分代では約50%に減少し、3分代では約28.5%まで減少し、12分代では約12.5%まで減少したことを確認できる。これに対して、バナバ葉エキス、グアバ葉エキス、混合物を50、100μg/mlの濃度で処理した群では、対照群と比較して、A2Eの光酸化を有意に抑制する傾向を確認することができる。
(1)実験方法
A2Eが蓄積された網膜色素上皮細胞に青色光を照射すると、光酸化が起こって細胞死滅を誘発することは既に知られているところ、ARPE−19細胞に20μMのA2Eを蓄積後、青色光を照射して誘発される細胞毒性をバナバ葉、グアバ葉のエキス及び混合物が抑制できるかを確認した。
図3を参照すると、青色光を照射した青色光照射群の細胞生存率が、青色光を照射していない対照群と比較して有意に減少したことから(P<0.001)、細胞死滅が誘導されることを確認できる。青色光を照射していない対照群と青色光照射群との間の細胞生存率の差を100%とし、青色光照射群と処理群の差から細胞保護効果を算出して各エキスの細胞保護効果を計算した。その結果、ルテインの細胞保護効果は48.4%、バナバ葉エキスの細胞保護効果は56.7%であった。グアバ葉エキスの細胞保護効果は63.6%、混合物の細胞保護効果は75.2%であった。これは混合物、グアバ葉、バナバ葉エキス処理群が、ルテイン17.04μg/mL(30μM)処理群よりも優れた細胞保護効果を有することを示し、またグアバ葉、バナバ葉エキスの単一の保護効果よりも混合物の方がさらに優れた保護効果を有することを示している。
1.各エキス及びそれらの混合物の青色光誘導黄斑変性の抑制能の分析
(1)実験方法
Balb−c mice(5週齢、オス)を2日間馴化飼育した後、バナバ葉、グアバ葉のエキス、混合物またはルテイン(50mg/kg)を7日間、1日1回の周期で経口投与した。その後、24時間の暗順応を経て、14日間、前記エキス、混合物及びルテインを経口投与し、30分後に青色光を10,000luxで1日1時間照射した。青色光の照射及びエキスの投与を終了した後、24時間後にマウスを犠牲にして眼球を摘出し、組織染色により網膜視細胞の保護効果を測定した(図4)。
図5及び図6を参照すると、視細胞外核層(outer nuclear layer、ONL)の厚さを測定したところ、青色光を照射していない対照群と比べて、青色光を照射した青色光照射群で42%程度減少し(P<0.001)、バナバ葉、グアバ葉のエキス、混合物またはルテイン投与群において青色光照射群に比べていずれも有意に増加したことを確認することができる。青色光を照射していない対照群と青色光を照射した青色光照射群との厚さの差を100%とし、青色光照射群と処理群の差から細胞外核層の保護効果を算出し、各投与群の青色光による視細胞外核層の厚さ保護効果を計算した。その結果、ルテイン投与群は28.2%、バナバ葉、グアバ葉のエキス、混合物投与群は、それぞれ39.0%、47.6%、60.9%と示された。
Claims (8)
- バナバ葉エキス又はグアバ葉エキスを含む黄斑変性の予防または治療用の薬学的組成物。
- 前記エキスの抽出溶媒は、水またはC1〜C4アルコールのうちの少なくとも一つを含むものである請求項1に記載の組成物。
- 前記エキスの抽出溶媒は、メタノールまたはエタノールのうちの少なくとも一つを含むものである請求項1に記載の組成物。
- 前記組成物は、前記バナバ葉エキス及び前記グアバ葉エキスを含む請求項1に記載の組成物。
- バナバ葉エキス又はグアバ葉エキスを含む黄斑変性の予防または改善用の健康機能食品。
- 前記エキスの抽出溶媒は、水またはC1〜C4アルコールのうちの少なくとも一つを含むものである請求項5に記載の健康機能食品。
- 前記エキスの抽出溶媒は、メタノールまたはエタノールのうちの少なくとも一つを含むものである請求項5に記載の健康機能食品。
- 前記健康機能食品は、前記バナバ葉エキス及び前記グアバ葉エキスを含む請求項5に記載の健康機能食品。
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