JP5448384B2 - 新規抗酸化性化合物、それを有効成分とする抗酸化剤、及びその製造方法 - Google Patents
新規抗酸化性化合物、それを有効成分とする抗酸化剤、及びその製造方法 Download PDFInfo
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Description
一般式[a]:
一般式[b]:
抗酸化性化合物
本発明の抗酸化性化合物は、下記一般式[1]で示される化合物である。
アシルとは、アルカノイル及びアルコキシカルボニルを意味し、好ましくは、C1-6アルカノイル及びC1-6アルコキシカルボニルである。C1-6アルカノイルの具体例としては、ホルミル、アセチル、プロピオニル、ブチリル、イソブチリル、バレリル等である。C1-6アルコキシカルボニルの具体例としては、メトキシカルボニル、エトキシカルボニル、プロポキシカルボニル、イソプロポキシカルボニル等である。
化合物[1]の単離
本発明の化合物[1]は、化合物[1]を含む植物、より好ましくはアブラナ科植物、最も好ましくはブロッコリー(Brassica oleracea var. italica)から単離することができる。これらの植物の使用する部位は、花部、葉部、茎部、根部、種子及び果実であり、好ましくは種子である。
一般式[a]:
一般式[b]:
本発明の化合物[1]は、天然抗酸化剤リコペンに比べ、高い抗酸化性を示すことから、化合物[1]は、抗酸化剤として用いることができる。
1.2kgの粉砕したブロッコリー種子をソックスレー抽出器を用いてMeOHで6時間加熱還流を行って抽出した。得られたMeOH抽出物(105g)をヘキサン、CH2Cl2、EtOAc、BuOHの各種溶媒を用いて順次転溶を行い、DPPH法を指標としてTLC上で抗酸化活性物質を追跡しながら、活性物質の単離を試みた。CH2Cl2ext.からは、Rf値0.6 (化合物1)および0.5 (化合物2)に強い活性が検出され、これら2種の化合物を単離することに成功した。
CH2Cl2ext.からSiO2カラムクロマトグラフィーを用いてCH2Cl2:EtOAc系、及びヘキサン:EtOAc系で順次分画を行い、抗酸化活性の強い化合物1を単離した。その化学構造は各種スペクトルからtrans-シナピン酸メチルであると決定した。
化合物1の化学構造は各種スペクトルデータから既知化合物であるtrans-シナピン酸メチルであると決定した。
HR-EIMS:m/z 332.0902[M]+(calcd. for C17H16O7 332.0884)
EI-MS m/z(relative intensity, %)
332[M]+(100), 223(34), 207(75), 180(30), 124(18), 109(60), 44(48), 40(44),
IR(KBr, vmax, cm-1): 3404, 2943,2843, 1707, 1676
4. 化合物3および4の単離
EtOAc ext. からは、SiO2カラムクロマトグラフィーを用いてCH2Cl2: アセトン系、CH2Cl2: MeOH系で順次分画を行い、fr. 2から化合物3を単離した。またfr. 4より強い抗酸化能を示す化合物4を単離した。図3にEtOAc ext.の分画を示す。
化合物3の化学構造は各種スペクトルデータから既知化合物である5−ヒドロキシメチル−2−フルアルデヒドであると決定した。
HR-EIMS:m/z 334.1042 [M]+(calcd. for C17H18O7 334.1053)
EI-MS m/z(relative intensity, %)
334[M]+(8), 316(310), 290(7), 224(100), 207(23), 180(13), 111(36), 94(35),
IR(KBr, vmax, cm-1): 3404, 2943,2843, 1707, 1676
6. 化合物2および4の化学合成
下記合成に用いた試薬は、いずれも和光純薬工業製である。
5−ヒドロキシメチル−2−フルアルデヒド500 mg(3.97 mmol), トリフェニルホスフィン1.04 g(3.97 mmol), シナピン酸890 mg(3.97 mmol) を無水テトラヒドロフラン20 mlに溶解し、氷冷撹拌下にアゾジカルボン酸ジイソプロピル780 μl(3.97 mmol) を3分間にて滴下する。同温度にて30分撹拌後、室温にて2時間撹拌した。溶媒を減圧留去後、残渣を中圧カラムクロマトグラフィー(Hex:EtOAc=1:2) にて精製し、化合物2を1.14 g (収率87%) 得た。アセトン-Hex から結晶化し淡黄色の無定形晶 m.p. 105〜106.5℃を得た。
化合物2 100 mg (0.3 mmol) をEtOH 2 ml と テトラヒドロフラン 1 mlの混合液に溶解し、氷冷撹拌下、水素化ホウ素ナトリウム 11 mg (0.3 mmol) を加え、室温にて20分間撹拌した。飽和塩化アンモニウム水溶液 2 ml を加え、EtOAcとテトラヒドロフラン(2:1)の混合液にて抽出し、飽和食塩水にて洗浄した。乾燥後、溶媒を留去し結晶性残渣を得た。EtOAc から結晶化し無色の無定形晶90 mg (収率90%)を得た。m.p. 156〜157℃
ブロッコリー種子より得られた抗酸化成分(化合物2、化合物4)のDPPHラジカル消去能を評価した。天然抗酸化剤リコペンに比べ、いずれも高い抗酸化性を示した(図4)。
400μMのDPPH溶液0.9mL、エタノール0.9mL、0.2M MES(2-モルホリンエタンスルホン酸)バッファー(pH6.0) 0.9mLに、試料溶液amLと5%エタノール(0.9-a)mLを加え、室温で20分反応させた後に520nmの吸光度を測定した(Abs(S))。a=0の吸光度を測定し(Abs(C))、式1によりラジカル消去率を求めた。
(式1)ラジカル消去率=[Abs(C)−Abs(S)]/Abs(C)×100
Claims (4)
- 5−ホルミル−2−フルフリルシナペート又は5−ヒドロキシメチル−2−フルフリルシナペートの単離方法であって、ブロッコリーからの抽出物を精製することを特徴とする単離方法。
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