JP4930597B2 - 腎症患者用大豆蛋白素材及びこれを使用した食品 - Google Patents
腎症患者用大豆蛋白素材及びこれを使用した食品 Download PDFInfo
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- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K36/00—Medicinal preparations of undetermined constitution containing material from algae, lichens, fungi or plants, or derivatives thereof, e.g. traditional herbal medicines
- A61K36/18—Magnoliophyta (angiosperms)
- A61K36/185—Magnoliopsida (dicotyledons)
- A61K36/48—Fabaceae or Leguminosae (Pea or Legume family); Caesalpiniaceae; Mimosaceae; Papilionaceae
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- A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
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- A23L33/00—Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof
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Description
Sandra R. Teixeira et al., J. Nutr., 133, 673-678, 2003. Joyce Trujillo et al., Am J Physiol Renal Physiol, 288, 1152, F108 - F116, 2005. JW Anderson et al., Am. J. Clinical Nutrition, 68, 1347, 1998.
その結果、大豆の酸沈殿性蛋白質のうち、7Sグロブリンや11Sグロブリン以外の酸沈殿性蛋白質の純度を高めた分画大豆蛋白、すなわち「非7S・11S−酸沈殿性大豆蛋白」に強い尿中アルブミン低下作用があるという知見を得て本発明を完成させるに到った。
(1)非7S・11S−酸沈殿性大豆蛋白からなることを特徴とする、腎症患者の蛋白質補給用大豆蛋白素材、
(2)非7S・11S−酸沈殿性大豆蛋白を使用してなる腎症患者の蛋白質補給用食品、
(3)非7S・11S−酸沈殿性大豆蛋白を有効成分とする腎症患者の腎症進行遅延用食品、
(4)腎症患者の腎症の進行遅延のための非7S・11S−酸沈殿性大豆蛋白の使用、
(5)非7S・11S−酸沈殿性大豆蛋白を有効量使用することを特徴とする腎症患者の腎症の進行遅延方法、
を提供するものである。
したがって簡易的に、7S,11S,LPの各蛋白質中の主要な蛋白質を選択し、それらの染色比率を求め、これらの比率からLP含量を推定する以下の方法を採用することができる。
(a) 各蛋白質中の主要な蛋白質として、7Sはαサブユニット及びα'サブユニット(α+α')、11Sは酸性サブユニット(AS)、LPは34kDa蛋白質及びリポキシゲナーゼ(P34+Lx)を選択し、SDS−PAGEにより選択された各蛋白質の染色比率を求める。電気泳動は表1の条件で行うことが出来る。
(b) X(%)=(P34+Lx)/{(P34+Lx)+(α+α’)+AS}×100(%)を求める。
(c) 低変性脱脂大豆から調製された分離大豆蛋白のLP含量を加熱殺菌前に上記方法1,2の分画法により測定すると凡そ38%となることから、X=38(%)となるよう(P34+Lx)に補正係数k*=6を掛ける。
(d) すなわち、以下の式によりLP推定含量(Lipophilic Proteins Content Index、以下「LCI」と略する。)を算出する。
また7SとLPを含むか、或いは7S、11S及びLPを含む大豆蛋白溶液(豆乳、分離大豆蛋白溶液、11S除去分画大豆蛋白溶液など)から、7Sに富む画分や11Sと7Sに富む画分を除去することにより得ることができる。脱脂大豆等から豆乳を抽出する際の温度は4〜60℃、pHは6〜9とするのが好ましい。
この方法のより具体的な例としては、予め11Sに富む画分を除去して7S及びLPに富む蛋白含有液を調製し、これから7Sに富む画分を除去することにより行うことができる。予め11Sに富む画分を除去する方法としては、11Sの等電点であるpH5.8〜6.4にpH調整し、11Sを選択的に沈殿・除去するなどの公知の方法を用いることができ、例えば以下の分画法を利用し、また適宜組み合わせて調製することができる。
(2)11Sの等電点付近で豆乳を抽出する方法(特開昭55−124457号公報)、
(3)抽出時に少量のカルシウム塩を添加し、11Sに富む画分を除去する方法(特開昭48−56843号公報)、
(4)pH1.2〜4.0の塩化ナトリウムまたは塩化カリウム存在下で11Sに富む画分を不溶性し除去する方法を製造する方法(特開昭49−31843号公報)、
(5)等電点沈殿したスラリーをpH5.0〜5.6に調整し、かつ塩化ナトリウム濃度を0.01〜0.2Mのモル濃度に調整して、11S画分を分離除去する方法(特開昭58−36345号公報)、
(6)11Sグロブリンが低温下では溶解性が低下する現象(冷沈現象とよぶ)を利用したもので、大豆蛋白原料を亜硫酸化合物、グルタチオン化合物、またはシステイン化合物の存在下、かつpH6.5以上の水系下処理しpH5.5〜7.0かつ20℃以下の範囲に調整して11Sに富む不溶性画分を除去する方法(特開昭61−187755号公報)、
(7)大豆蛋白を含む溶液にフィターゼを作用させ、該溶液をpH5.6〜6.6に調整し、11Sに富む不溶性画分として除去する方法(WO00/58492号公報)、
(8)11Sを欠損する大豆から大豆蛋白を水抽出する方法、等
WO2006/129647号公報の比較実験例2の実施例2、比較実験例3、実施例7及び実施例9の方法に準じて調製された高LP-SPI(LCI値71%)、11S分画大豆蛋白(LCI値12%)、7S分画大豆蛋白(LCI値12%)の各種素材と、市販の分離大豆蛋白(LCI値40%)をサンプルとして、各大豆蛋白の糖尿病性腎症の初期進行遅延効果について確認した。
AIN-93G組成(REEVES P.G.ら:J. NUTR., 123, 1939-1951, 1993.)に基づき、カゼイン「ビタミンフリーカゼイン」(オリエンタル酵母(株)製、以下「カゼイン」と記載する。)を粗蛋白量として20重量%含む配合食を対照として、蛋白質源をそれぞれ分離大豆蛋白質(比較例1)、11S分画大豆蛋白(比較例2)、7S分画大豆蛋白(比較例3)、又は高LP-SPI(実施例1)で置換した試験食(表2)を以下の方法で動物に摂取させた。モデル動物は8週齢のKKAy系雄マウス(日本クレア(株)販)を50匹使用した。1週間の予備飼育後、群間の平均体重および尿アルブミン量がほぼ同等になるように各群10匹ずつに群分けし、7週間の試験食飼育を行った。
血糖値に関しては他の画分と比較して7S画分が最も低くなり高LP-SPI画分に血糖低下効果は認められなかったことから、この高LP-SPIの腎症の進展遅延効果は血糖改善による効果ではないことが分かった。
また、高LP-SPI画分の蛋白吸収率は従来の大豆蛋白と変わらず、非常に高いにもかかわらず腎症の遅延効果が認められたことから、この新規の大豆蛋白素材は腎症患者に対して非常に有用な蛋白質であることが認められた。
Claims (2)
- LCI値が50%以上である非7S・11S−酸沈殿性大豆蛋白を有効成分とする尿中アルブミン上昇抑制剤。
- LCI値が50%以上である非7S・11S−酸沈殿性大豆蛋白を有効成分とする腎症の進展遅延剤。
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JPS55124457A (en) | 1979-03-19 | 1980-09-25 | Noda Sangyo Kagaku Kenkyusho | Preparation of 7s protein |
US4370267A (en) | 1981-08-10 | 1983-01-25 | A. E. Staley Manufacturing Company | Fractionation and isolation of 7S and 11S protein from isoelectrically precipitated vegetable protein mixtures |
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