JP7426026B2 - 試料前処理方法及び分析方法 - Google Patents
試料前処理方法及び分析方法 Download PDFInfo
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Description
以下の実施例1~6において、試薬としては、ペントシジンの標準物質にはPolypeptide社(フランス)のpentosidine‐トリフルオロ酢酸(TFA)塩を使用した。クエン酸は、和光純薬工業社製のものを使用した。ギ酸は和光純薬工業社製のものを使用した。血液サンプルの加水分解には35%塩酸(和光純薬工業)又は無鉄塩酸(hydrochroric Acid(35%) Fe free:ナカライテスク)を使用した。アセトニトリルは、HPLC用を使用した。装置は、HPLC Prominence システム(on‐line degassing unit:DGU20A3、pump unit with low‐pressure gradient unit:LC20AT、auto‐sampler:SIL20AC、column oven:CTO20AC、fluorescence detector:RF20Axs)及びデータ解析システム(LC solution:島津製作所)又は、Gulliver&EXTREMA HPLCシステム(3-line degasser:DG-980-50、Ternary gradient unit:LG-1580-02、Intelligent HPLC pump:PU-980、Intelligent sampler:AS-2057-Plus、Fluorescence detector:FP-4020、Column oven:CO-4020)及びデータ解析システム(ChromNAV:日本分光)を使用した。
以下の実施例1~6において使用するシリカモノリス体は、以下のようにして形成した。水溶性高分子であるポリエチレンオキシド0.70gを0.001N酢酸水溶液10gに溶解し、この溶液にテトラメトキシシラン5mLを攪拌下で加えて加水分解反応を行った。数分攪拌した後に得られた透明溶液を密閉容器に移し、40℃の恒温槽中で固化させた。固化したゲルを数時間熟成させ、0.1Nアンモニア水溶液中に、40℃で1日毎に溶液を交換しながら3日間浸漬した。この後、ゲルを60℃で乾燥し、100℃/hの昇温速度で600℃まで加熱した。これによって非晶質シリカよりなる多孔質のモノリス体を得た。得られた多孔質のシリカモノリス体は、水銀圧入測定及び窒素吸着測定により、中心孔径5μm程度の貫通孔(スルーポア)、10nm程度の細孔(メソポア)が多数存在していることが確認され、表面積は350m2/gであることが分かった。
シリカモノリス体へのオクタデシル基及び強陽イオン交換基の修飾は以下の方法で行った。表面処理として、オクタデシル基とリンカーの同時修飾は以下ように行った。先ず、上記のようにして得られたシリカモノリス体を1.5mm厚でダイアモンドカッターにて機械的に切断し、80℃で2日間減圧乾燥させた。乾燥させたシリカモノリス体1gに対してオクタデシルトリメトキシシラン1g、メタクリロキシプロピルトリメトキシシラン0.2g、特級ヘキサン3gを300mLナス型フラスコに入れ、減圧にしながら超音波をあて、メソポア内の空気を除去しながら、溶解し、混合した。混合後、70℃でロータリーエバポレーターによりヘキサンを飛ばした。その後、シリカモノリス体をステンレス製の密閉容器に入れ、窒素パージを行った後、200℃、10時間反応させた。反応後、シリカモノリス体をヘキサン50mLで2回、アセトン50mL1回で超音波洗浄し、デカンテーション破棄を繰り返した後、70℃で減圧乾燥を1日行った。
以下の実施例1~6においてシリカモノリス体を用いる時にはスピンカラムを用いた。スピンカラムは、直径約4.3mm×厚み1.5mmの上記シリカモノリス体3を、ポリプロピレン製の空のカラム2へ挿入し、超音波融着法にて、図9に示すスピンカラム1を作成した。
血漿サンプル50μLに0.2M水素化ホウ素ナトリウム溶液(pH9.5)250μLを添加、30分間室温にて静置し、アミノ基の保護処理をおこなった。次に、処理済みサンプル300μLに20%トリクロロ酢酸1mLを添加し、15分間氷冷後に遠心分離を行い、上清を除去した。そして、沈殿に5%トリクロロ酢酸1mLを添加し、15分間氷冷後に遠心分離を行い、上清を除去した。その後沈殿に蒸留水100μLを添加し懸濁させた。次に、トリクロロ酢酸沈殿後懸濁試料100μLに6N塩酸100μLを添加し酸加水分解(105℃、18時間)をおこなった。そして、遠心エバポレーターで乾固し、0.1Mクエン酸400μLにて再溶解した。この溶液を試料溶液(血漿酸加水分解物)とした。
2 空のカラム
3 モノリス体
Claims (16)
- 生体試料を、65℃~110℃で、酸加水分解処理し、前記酸加水分解処理された生体試料は濃縮乾固処理を行わないで、前記酸加水分解処理された生体試料に塩基性緩衝液を添加し、モノリス体で構成される固相に添加し、前記酸加水分解処理された生体試料を溶出する、糖化最終生成物の分析のための試料前処理方法。
- 前記塩基性緩衝液は、トリス(ヒドロキシメチル)アミノメタン水溶液である請求項1に記載の糖化最終生成物の分析のための試料前処理方法。
- 前記モノリス体が、疎水性官能基と陽イオン交換基とを有する請求項1又は2に記載の糖化最終生成物の分析のための試料前処理方法。
- 前記酸加水分解処理された生体試料を前記固相に添加し、揮発性塩及び有機溶媒を含有する溶媒で溶出する工程を備える請求項1から3のうち何れか1項に記載の糖化最終生成物の分析のための試料前処理方法。
- 前記酸加水分解処理された生体試料を前記固相に添加し、揮発性塩を含有する溶媒で溶出し、連続して、揮発性塩及び有機溶媒を含有する溶媒で溶出する請求項4に記載の糖化最終生成物の分析のための試料前処理方法。
- 前記モノリス体がカーボン量20~30wt%、表面積300~400m2/g、細孔径5~20nmである請求項1から5のうち何れか1項に記載の糖化最終生成物の分析のための試料前処理方法。
- 前記固相の通液方法が遠心法である請求項1から6のうち何れか1項に記載の糖化最終生成物の分析のための試料前処理方法。
- 前記モノリス体は、疎水性官能基と陽イオン交換基とを有し、前記陽イオン交換基がリンカーを介したグラフト重合により合成されている請求項1から7のうち何れか1項に記載の糖化最終生成物の分析のための試料前処理方法。
- 前記モノリス体は、前記疎水性官能基とリンカー試薬を同時に結合させる工程を含んだ方法により製造された請求項8に記載の糖化最終生成物の分析のための試料前処理方法。
- 前記モノリス体は、シリカモノリス体である請求項1から9のうち何れか1項に記載の糖化最終生成物の分析のための試料前処理方法。
- 前記生体試料が血漿又は血清である請求項1から10のうち何れか1項に記載の糖化最終生成物の分析のための試料前処理方法。
- 前記酸加水分解処理は、塩酸を用いて行う請求項1から11のうち何れか1項に記載の糖化最終生成物の分析のための試料前処理方法。
- 前記糖化最終生成物はペントシジンである請求項1から12のうち何れか1項に記載の糖化最終生成物の分析のための試料前処理方法。
- 請求項1から13のうち何れか1項に記載の試料前処理方法により調製された試料を、液体クロマトグラフィーを用いると共に、UV検出、蛍光検出又は質量分析することを含む糖化最終生成物の分析方法。
- 液体クロマトグラフィー溶離液にギ酸を添加する請求項14に記載の糖化最終生成物の分析方法。
- 液体クロマトグラフィー用カラム充填剤がC18、C8、C4、Phから選択される1種である請求項14又は15に記載の糖化最終生成物の分析方法。
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