JPWO2018016551A1 - アレルゲン検出方法 - Google Patents
アレルゲン検出方法 Download PDFInfo
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- JPWO2018016551A1 JPWO2018016551A1 JP2018528848A JP2018528848A JPWO2018016551A1 JP WO2018016551 A1 JPWO2018016551 A1 JP WO2018016551A1 JP 2018528848 A JP2018528848 A JP 2018528848A JP 2018528848 A JP2018528848 A JP 2018528848A JP WO2018016551 A1 JPWO2018016551 A1 JP WO2018016551A1
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- buckwheat
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Abstract
Description
試料をタンパク質分解酵素で処理すること、および
クロマトグラフィー分離を利用した分析により、該酵素処理した試料中におけるアレルゲン由来ポリペプチドの存在の有無を検出することを含み、
該アレルゲンが、ソバ、甲殻類、乳、卵およびラッカセイからなる群より選択される1種以上である、
方法を提供する。
VQVVGDEGR (配列番号1)
SVFDDNVQR (配列番号2)
GQILVVPQGFAVVLK(配列番号3)
EGLEWVELK (配列番号4)
NFFLAGQSK (配列番号5)
GFIVQAR (配列番号6)
NDDNAITSPIAGK (配列番号7)
本発明の方法においては、上記配列番号1〜7で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上の有無が検出されればよいが、好ましくはそれらのポリペプチドの全ての有無が検出される。
IQLLEEDLER(配列番号8)
MDALENQLK (配列番号9)
FLAEEADR (配列番号10)
IVELEEELR (配列番号11)
LAMVEADLER(配列番号12)
本発明の方法においては、上記配列番号8〜12で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上の有無が検出されればよいが、好ましくはそれらのポリペプチドの全ての有無が検出される。
FFVAPFPEVFGK(配列番号13)
YLGYLEQLLR (配列番号14)
NAVPITPTLNR (配列番号15)
VLVLDTDYK (配列番号16)
TPEVDDEALEK (配列番号17)
本発明の方法においては、上記配列番号13〜17で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上の有無が検出されればよいが、好ましくはそれらのポリペプチドの全ての有無が検出される。カゼインについては、好ましくは配列番号13〜15で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上、より好ましくはそれらのポリペプチドの全ての有無が検出され、BLGについては、好ましくは配列番号16〜17で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上、より好ましくはそれらのポリペプチドの全ての有無が検出される。
YPILPEYLQCVK (配列番号18)
ELINSWVESQTNGIIR(配列番号19)
LTEWTSSNVMEER (配列番号20)
HIATNAVLFFGR (配列番号21)
本発明の方法においては、上記配列番号18〜21で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上の有無が検出されればよいが、好ましくはそれらのポリペプチドの全ての有無が検出される。
DLAFPGSGEQVEK (配列番号22)
VLLEENAGGEQEER(配列番号23)
SPDIYNPQAGSLK (配列番号24)
本発明の方法においては、上記配列番号22〜24で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上の有無が検出されればよいが、好ましくはそれらのポリペプチドの全ての有無が検出される。Ara h1については、好ましくは配列番号22〜23で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上、より好ましくはそれらのポリペプチドの全ての有無が検出され、Ara h3については、好ましくは配列番号24で示されるアミノ酸配列からなるポリペプチドの有無が検出される。
アセトニトリル(和光純薬工業、特級、HPLC用)
トリプシン(和光純薬工業、ブタ脾臓由来 生化学分析用)
ヨードアセトアミド(IA)(和光純薬工業、生化学分析用)
ジチオスレイトール(DTT)(和光純薬工業、生化学分析用)
尿素(和光純薬工業、特級)
トリフルオロ酢酸(TFA)(純正化学 特級)
(緩衝液)
A:0.1MDTT_0.5MTris−HCl_4M尿素(pH8.2)緩衝液
B:0.5MTris−HCl_2M尿素(pH8.2)緩衝液
検体0.5gを15mLディスポ試験管に採取し、緩衝液A(試験例1〜3)または緩衝液B(試験例4〜5)を5mL加え、3時間(試験例1〜3)または5時間(試験例4〜5)振とう抽出した。得られた反応物を3000rpmで5分間遠心分離し、上清を回収した。
1)トリプシン消化
アレルゲン分子1mgまたは参考例1で調製した上清0.25mLを1.5mL用ポリチューブに採取し、緩衝液A(試験例1〜3)または緩衝液B(試験例4〜5)を0.25mL加えて完全に溶解させた。得られた溶液に40mg/mL DTT50μLを加えて、37℃で90分間インキュベートし、次いで40mg/mL IA50μLを加えて、37℃で30分間、遮光化でインキュベートした。反応液に50mM炭酸水素ナトリウム600μLを加え、次いで10mg/mLトリプシン50mM炭酸水素ナトリウム溶液を100μL加え、37℃で16時間インキュベートした(pH7〜9)。反応後、TFA10μLを加えてトリプシンを失活させた。
OASIS HLB(3cc、60mg;Waters)をメタノール1mLおよび水2mLでコンディショニングした。これに1)で得られた反応液の全量を滴下した後、水1mLで洗浄し、次いで60%アセトニトリル1mLにより溶出した。
2)で得られた溶出物を、40℃で窒素乾固後、25%アセトニトリル0.2mLに溶解させた。得られた溶液をフィルターろ過後、下記条件にてLC−MS/MS MRMを行った。
HPLC:Shimadzu NexeraX2
MS/MS:ABSCIEX QTRAP5500
(HPLC条件)
カラム:Kinetik C18 150mm×2.1mm、粒径2.6μm
カラム温度:50℃
カラム流量:0.3mL
溶離液A:0.1%ギ酸;溶離液B:0.1%ギ酸アセトニトリル
グラジエント:A:B 95:5(0min)→40:60(20min)→20:80(50min)→95:5(55min)→95:5(90min)
(質量分析条件)
イオン化法:エレクトロスプレーイオン化法
極性:ポジティブ
スプレー電圧:5500V
ターボヒーター温度:450℃
22kDaタンパク質(配列番号25)を標的アレルゲン分子として、表1に示す条件でLC−MS/MS MRMにより標的アレルゲン由来ポリペプチドを検出した。結果を図1に示す。
トロポミオシン(配列番号26)を標的アレルゲン分子として、表2に示す条件でLC−MS/MS MRMにより標的アレルゲン由来ポリペプチドを検出した。結果を図2に示す。
ソバまたは甲殻類(エビパウダー)を0.01質量%添加した小麦粉から、参考例1に従ってアレルゲン含有試料を調製した。得られた試料を、実施例1に従ってトリプシン消化、脱塩およびLC−MS/MS MRMにかけ、標的アレルゲン由来ポリペプチドを検出した。対照として、ソバまたは甲殻類無添加小麦粉を用いて同様の分析を行った。検出するソバおよび甲殻類のアレルゲン由来ポリペプチド、およびLC−MS/MS分析の条件は、それぞれ表1および表2と同じとした。測定結果を図3および4に示す。
全粉乳、全卵粉およびラッカセイ粉のそれぞれから、参考例1に従ってアレルゲン含有試料を調製した。各試料を、実施例1の1)〜3)に従ってトリプシン消化、脱塩およびLC−MS/MS MRMにかけ、標的アレルゲン由来ポリペプチドを検出した。全粉乳、全卵粉およびラッカセイ粉のそれぞれについての標的アレルゲン分子、および検出したアレルゲン由来ポリペプチドを、表3〜5に示す。全粉乳、全卵粉およびラッカセイ粉のいずれのアレルゲンも、LC−MS/MS分析で検出することができた(図5〜7)。
全粉乳および落花生粉のいずれかを添加したパン(添加パン;添加量0.84質量%)、ならびに乳および落花生を含まないパン(無添加パン)を製造した。添加パンと無添加パンを混合し、100倍希釈添加パン(全粉乳および落花生粉の添加量0.0084質量%)を調製した。得られた100倍希釈添加パンに含まれる乳またはラッカセイアレルゲン(カゼインおよびAra hを含むラッカセイ可溶性タンパク質)の濃度をELISA法にて測定した(定量下限値1ppm)。測定結果を表6に示す。
Claims (13)
- 試料中のアレルゲンを検出する方法であって、
試料をタンパク質分解酵素で処理すること、および
クロマトグラフィー分離を利用した分析により、該酵素処理した試料中におけるアレルゲン由来ポリペプチドの存在の有無を検出することを含み、
該アレルゲンが、ソバ、甲殻類、乳、卵およびラッカセイからなる群より選択される1種以上である、
方法。 - 前記アレルゲンがソバおよび/または甲殻類である、請求項1記載の方法。
- 前記アレルゲンがソバ、甲殻類、乳、卵およびラッカセイである、請求項1記載の方法。
- 前記アレルゲンがソバであり、前記アレルゲン由来ポリペプチドが、配列番号1〜7で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上である、請求項1記載の方法。
- 前記アレルゲンが甲殻類であり、前記アレルゲン由来ポリペプチドが、配列番号8〜12で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上である、請求項1記載の方法。
- 前記アレルゲン由来ポリペプチドが、配列番号1〜7で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上と、配列番号8〜12で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上である、請求項2記載の方法。
- 前記アレルゲン由来ポリペプチドが、配列番号1〜7で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上と、配列番号8〜12で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上と、配列番号13〜17で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上と、配列番号18〜21で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上と、配列番号22〜24で示されるアミノ酸配列からなるポリペプチドのいずれか1種以上である、請求項3記載の方法。
- 配列番号1〜7で示されるアミノ酸配列からなるポリペプチドの全てについて存在の有無を検出する、請求項4記載の方法。
- 配列番号8〜12で示されるアミノ酸配列からなるポリペプチドの全てについて存在の有無を検出する、請求項5記載の方法。
- 配列番号1〜12で示されるアミノ酸配列からなるポリペプチドの全てについて存在の有無を検出する、請求項6記載の方法。
- 配列番号1〜24で示されるアミノ酸配列からなるポリペプチドの全てについて存在の有無を検出する、請求項7記載の方法。
- 前記クロマトグラフィー分離を利用した分析が液体クロマトグラフィータンデム質量分析法(LC−MS/MS)である、請求項1〜11のいずれか1項記載の方法。
- 前記タンパク質分解酵素がトリプシンである請求項1〜12のいずれか1項記載の方法。
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