JP6025538B2 - 分岐鎖アミノ酸の劣化臭抑制剤及び劣化臭抑制方法 - Google Patents
分岐鎖アミノ酸の劣化臭抑制剤及び劣化臭抑制方法 Download PDFInfo
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Description
(2)分岐鎖アミノ酸に対するイミダゾールジペプチドの配合量が、重量比で0.005〜0.55倍量であることを特徴とする(1)に記載の分岐鎖アミノ酸の劣化臭抑制剤組成物。
(3)分岐鎖アミノ酸に対するイミダゾールジペプチドの配合量が、重量比で0.01〜0.40倍量であることを特徴とする(1)又は(2)に記載の分岐鎖アミノ酸の劣化臭抑制剤組成物。
(4)前記分岐鎖アミノ酸がイソロイシンである(1)〜(3)のいずれかに記載の分岐鎖アミノ酸の劣化臭抑制剤組成物。
(5)(1)〜(4)に記載の劣化臭抑制剤を、イミダゾールジペプチドが8〜155mg/Kgとなるように含有する分岐鎖アミノ酸含有飲食品。
(6)前記飲食品が飲料である(5)に記載の分岐鎖アミノ酸含有飲食品。
(7)分岐鎖アミノ酸を含有する飲食品に、イミダゾールジペプチドを有効成分として含有させることを特徴とする分岐鎖アミノ酸の劣化臭抑制方法。
(8)イミダゾールジペプチドを、分岐鎖アミノ酸に対して重量比で0.005〜0.55倍量含有させることを特徴とする(7)に記載の分岐鎖アミノ酸の劣化臭抑制方法。
(9)イミダゾールジペプチドを、分岐鎖アミノ酸に対して重量比で0.01〜0.40倍量含有させることを特徴とする(7)又は(8)に記載の分岐鎖アミノ酸の劣化臭抑制方法。
(10)前記分岐鎖アミノ酸がイソロイシンである(7)〜(9)のいずれかに記載の分岐鎖アミノ酸の劣化臭抑制方法。
本明細書において使用する用語の意味は以下のとおりである。
「劣化臭」とは、経時などの要因により品質が劣化して発生してくる生臭さや金属臭のような臭いをいう。したがって、「劣化臭抑制」という場合には、生臭さや金属臭のような劣化臭、特にイソロイシン等の分岐鎖アミノ酸の劣化に起因する生臭さや金属臭のような劣化臭が、摂取時に摂取者が気にならない程度まで抑えられた状態をいう。用語「異味・異臭」も「劣化臭」と同意である。
本発明の特徴は、イミダゾールジペプチドを分岐鎖アミノ酸に対して特定の割合で併用・配合することにより、経時により発生してくる分岐鎖アミノ酸、とりわけイソロイシンの劣化臭を、イミダゾールジペプチドが抑制することが可能となる。分岐鎖アミノ酸の劣化臭発生抑制方法として、劣化臭抑制効果を得るための効果的な配合量は、イミダゾールジペプチド量を、重量基準で分岐鎖アミノ酸の0.005〜0.55倍量、好ましくは0.01〜0.40倍量、さらに好ましくは0.08〜0.35倍量含有させるものである。したがって、この重量比率における分岐鎖アミノ酸含有物、好ましくはロイシン及びイソロイシン含有物、さらに好ましくはイソロイシン含有物へイミダゾールジペプチドを添加することは、「分岐鎖アミノ酸の劣化臭抑制方法」であるとも言うことができる。
分岐鎖アミノ酸に対するイミダゾールジペプチドの配合量([イミダゾールジペプチド/分岐鎖アミノ酸]比率)は、重量基準で分岐鎖アミノ酸の0.005〜0.55、好ましくは0.01〜0.40倍量、さらに好ましくは0.08〜0.35倍量含有すると、分岐鎖アミノ酸、とりわけイソロイシンが経時により発生させる異味・異臭をイミダゾールジペプチドが抑制し、容器詰飲料として長期間保管した場合であっても長期間嗜好性が良好な飲料を提供することが可能となる。また、スポーツ飲料とした場合には、水分補給と同時に運動時の筋肉疲労を軽減することが可能となる。
さらに、イミダゾールジペプチドは、8〜155mg/Kgとなるように含有することが好ましい。それ未満では分岐鎖アミノ酸の劣化臭抑制効果が不十分となり、それを上回る場合はイミダゾールジペプチドに起因する後味の悪さが出てきてしまうためである。劣化臭抑制効果を奏しつつ後味の悪さを感じさせないイミダゾールジペプチド含有量は、分岐鎖アミノ酸の含有量にもよるが、好ましくは20〜140mg/Kg、更に好ましくは30〜120mg/Kgである。また、抗疲労効果を発揮しつつイミダゾールジペプチドに劣化臭を抑制されるのに適当な分岐鎖アミノ酸含有量は、150〜3000mg/Kg、好ましくは200〜2500mg/Kg、更に好ましくは600〜1200mg/Kgである。
[試験方法]
イオン交換水に果糖ブドウ糖液糖7重量%、クエン酸0.12重量%、クエン酸ナトリウム0.05重量%を添加し、さらに表1に記載の通り分岐鎖アミノ酸としてのイソロイシン及びイミダゾールジペプチド源としてのチキンエキス配合量を添加した後、イオン交換水を加えて1000gに調整して各サンプルを作成した。チキンエキス(日本ハム社製「イミダ40」)は、鶏肉を熱水抽出し、酵素処理、脱塩、イオン交換、濃縮、乾燥工程を経て製造されたイミダゾール高含有エキスである(イミダゾールペプチド含有率40.1%)。
飲料の開発を担当する訓練された10人のパネラーにより、サンプル100mLを試飲することで香味・呈味を評価した。サンプルは5℃または45℃(加速試験)で2週間保管したものをそれぞれ評価し、45℃(加速試験)で2週間保管したものが、5℃で2週間保管したものと比較してどれだけ変化したかを評価した。評価は以下に示す基準で、劣化臭及び苦味後味の2項目に関し、劣化臭は5段階、苦味後味は○、△及び×の3段階にて評価した。評価の平均値を各表に示す。
5:劣化臭(生臭さ・金属臭)を殆ど、または全く感じない
4:わずかに劣化臭が感じられるが許容範囲である
3:許容範囲を超える劣化臭を感じる
2:やや強い劣化臭を感じる
1:強い劣化臭を感じる
○:後味に不快な苦味を感じないか、またはわずかに感じるが、許容範囲内である
△:後味に不快な苦味を感じるが、許容範囲内である
×:許容範囲を超える程度に、後味に不快な苦味を感じる
◎:劣化臭評価が5であり、かつ後味評価が○のもの
○:劣化臭評価が4であり、かつ後味評価が○のもの
△:劣化臭評価が3以下のもの、または後味評価が△のもの
×:劣化臭評価が3以下のもの、または後味評価が×のもの
試験例1及び2は分岐鎖アミノ酸を170mg/Kg添加した飲料である。試験例1はイミダゾールジペプチドが添加されていないため、許容範囲を超える劣化臭が発生しているが、試験例2はイミダゾールジペプチドが、分岐鎖アミノ酸の約0.08倍量添加されたことにより、試験例1よりも劣化臭が抑制されている。
試験例3〜7は分岐鎖アミノ酸を250mg/Kg添加した飲料である。試験例3はイミダゾールジペプチドが添加されていないため、許容範囲を超える劣化臭が発生しているが、試験例4〜7にはイミダゾールジペプチドが添加されたことにより、試験例3よりも劣化臭が抑制されている。劣化臭の抑制度合いは、イミダゾールジペプチドを分岐鎖アミノ酸の約0.16〜0.33倍量添加した試験例6及び7でとりわけ顕著であった。
試験例8〜11は分岐鎖アミノ酸を630mg/Kg添加した飲料である。試験例8はイミダゾールジペプチドが添加されていないため、やや強い劣化臭が発生しているが、試験例9〜11にはイミダゾールジペプチドが添加されたことにより、試験例8よりも劣化臭が抑制されている。しかしながら、試験例11は後味に苦味を生じだし、好適な飲料とは言えなかった。これは、イミダゾールジペプチドを比較的高濃度(200mg/Kg以上)に添加していることが起因している可能性がある。
試験例12〜15は分岐鎖アミノ酸を1000mg/Kg添加した飲料である。試験例12はイミダゾールジペプチドが添加されていないため、強い劣化臭が発生していた。一方、試験例13〜15にはイミダゾールジペプチドが、重量基準で分岐鎖アミノ酸の約0.04倍以上量添加されているため、試験例12よりも劣化臭が抑制されている。しかしながら、試験例15は後味に苦味を生じだし、好適な飲料とは言えなかった。これは、イミダゾールジペプチドを比較的高濃度(160mg/Kg以上)に添加していることが起因している可能性がある。
以上の通り、本願明細書に記載の範囲にある分岐鎖アミノ酸量、イミダゾールジペプチド/分岐鎖アミノ酸比率及びイミダゾールジペプチド量の試験例2、4〜7、9、10、13及び14は分岐鎖アミノ酸の一種であるイソロイシンの経時劣化を起因とする劣化臭において抑制効果を示し、かつイミダゾールジペプチドに起因する苦い後味も生じていない好適な飲料であった。
Claims (1)
- 鶏肉を熱水抽出し、酵素処理、脱塩、イオン交換、濃縮、乾燥工程を経て製造されたイミダゾール高含有エキスを有効成分とするイソロイシンに起因する劣化臭の抑制方法であって、前記エキス中におけるイミダゾールジペプチドの含有率が40.0〜41.2%であり、イソロイシン含有量170〜1000mg/kgに対するイミダゾールジペプチドの含有量が14〜160mg/kgであると共に、前記イソロイシンに対する前記イミダゾールジペプチドの重量比が0.04〜0.32であり、前記イソロイシン含有量170〜1000mg/kgに対する前記エキスの含有量が25〜500mg/kgであると共に、イソロイシンに対する前記エキスの重量比が0.10〜0.80となるように前記エキスを添加することを特徴とするイソロイシンに起因する劣化臭の抑制方法。
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