JP5509060B2 - 電気泳動法によるヘモグロビンの分析方法 - Google Patents
電気泳動法によるヘモグロビンの分析方法 Download PDFInfo
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- JP5509060B2 JP5509060B2 JP2010288142A JP2010288142A JP5509060B2 JP 5509060 B2 JP5509060 B2 JP 5509060B2 JP 2010288142 A JP2010288142 A JP 2010288142A JP 2010288142 A JP2010288142 A JP 2010288142A JP 5509060 B2 JP5509060 B2 JP 5509060B2
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- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/72—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving blood pigments, e.g. haemoglobin, bilirubin or other porphyrins; involving occult blood
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Description
本例では、前記分離改善剤として、前記酸性物質であるシクロヘキサンカルボン酸を用いて、カルバミル化Hbを含む試料液を分析した。
分離度=1.18×(t2−t1)/(p1+p2)
t1=修飾Hbのピークの検出時間
t2=安定型HbA1cのピークの検出時間
p1=修飾Hbのピークのピーク半値幅※
p2=安定型HbA1cのピークのピーク半値幅※
※ピーク半値幅:ピーク高さの中点におけるピーク幅
本例では、Hbコントロールサンプルに代えて、ヒト全血を使用し、前記シアン酸ナトリウムに代えて、Hbのアルデヒド化のためにアセトアルデヒドを使用した。そして、アセトアルデヒドが10mg/100mLとなるようにヒト全血に添加した以外は、前記実施例1と同様にして、試料液(pH4.8)を調製した。この試料液を使用した以外は、実施例1と同様にして分析した。
本例では、Hbコントロールサンプルに代えて、ヒト全血を使用し、前記シアン酸ナトリウムに代えて、Hbの糖化のためにグルコースを使用した。そして、グルコースが1500mg/100mLとなるようにヒト全血に添加した以外は、前記実施例1と同様にして、試料液(pH4.8)を調製した。この試料液を使用した以外は、実施例1と同様にして分析した。
本例では、前記分離改善剤として、前記シクロヘキサンカルボン酸に代えて、L−グルタミン酸(pKa1=2.18、pKa2=4.20)を用いた以外は、実施例1と同様にして分析した。
本例では、前記表1の泳動液の組成において、前記分離改善剤を無添加とし、緩衝剤であるL−酒石酸に代えて、前記酸性物質であるD−酒石酸を100mmol/Lとなるように添加して、泳動液を調製した。また、この泳動液の組成に基づいて、前記実施例1と同様にして、希釈液を調製した。前記泳動液および前記希釈液を用いた以外は、実施例1と同様にして分析した。D−酒石酸の酸解離定数は、pKa1=2.82であり、pKa2=3.96である。
本例では、前記表1の泳動液の組成において、前記分離改善剤を無添加として、緩衝液として、L−酒石酸−アルギニン水溶液に代えて、100mmol/L グルタル酸−アルギニン水溶液または100mmol/L プロピオン酸−アルギニン水溶液を使用して、泳動液を調製した。また、この泳動液の組成に基づいて、前記実施例1と同様にして、希釈液を調製した。前記泳動液および前記希釈液を用いた以外は、実施例1と同様にして分析した。グルタル酸は、2つのカルボキシル基を有し、前記カルボキシル基の酸解離定数は、pKa1=4.13、pKa2=5.01である。また、プロピオン酸は、カルボキシル基を1つのみ有し、酸解離定数は、pKa=4.86である。
Claims (24)
- 泳動液中にカルボキシル基を二つ以上有する酸性物質を有する条件下で電気泳動を実施し、
前記酸性物質の少なくとも二つのカルボキシル基の酸解離定数(pKa)が、分析時の前記泳動液のpHよりも低く、
下記(1)および(2)の少なくとも一方を満たすことを特徴とする、電気泳動法によるヘモグロビンの分析方法。
(1)ヘモグロビンを含む試料液のpHと、前記泳動液のpHとの差が、0.3未満である
(2)前記酸性物質が、炭素環カルボン酸およびL−グルタミン酸の少なくとも一方である - 前記酸性物質の二つのカルボキシル基の酸解離定数(pKa)が、分析時の前記泳動液のpHよりも低いことを特徴とする、請求項1記載の分析方法。
- 前記泳動液が、緩衝剤および分離改善剤を含み、
前記分離改善剤が、前記酸性物質を含むことを特徴とする、請求項1または2記載の分析方法。 - 前記酸性物質の二つ以上のカルボキシル基の各酸解離定数(pKa)が、分析時の前記泳動液のpHよりも0.7以上低いことを特徴とする、請求項1から3のいずれか一項に記載の分析方法。
- 前記泳動液が、緩衝剤を含み、前記緩衝剤の緩衝能に関与する酸解離定数(pKa)が、分析時の前記泳動液のpH−0.3の値以上であることを特徴とする、請求項1から4のいずれか一項に記載の分析方法。
- 前記泳動液が、緩衝剤および分離改善剤を含み、
前記分離改善剤が、前記酸性物質を含み、
前記緩衝剤の緩衝能に関与する酸解離定数(pKa)から、前記分離改善剤の前記酸性物質のカルボキシル基の第二解離定数(pKa2)を引いた差が、0.2以上であることを特徴とする、請求項1から5のいずれか一項に記載の分析方法。 - 前記炭素環カルボン酸が、シクロヘキサン環を有する構造であることを特徴とする、請求項1から6のいずれか一項に記載の分析方法。
- 前記電気泳動法によるヘモグロビンの分離が、分離キャピラリー流路で実施されることを特徴とする、請求項1から7のいずれか一項に記載の分析方法。
- ヘモグロビンを含む試料液を、連続して前記分離キャピラリー流路に導入する、連続試料導入法により実施されることを特徴とする、請求項8記載の分析方法。
- 前記分離キャピラリー流路が、マイクロチップに形成されており、
前記電気泳動法が、マイクロチップ電気泳動法であることを特徴とする、請求項8または9記載の分析方法。 - 前記分離キャピラリー流路が、キャピラリー管であり、
前記電気泳動法が、キャピラリー電気泳動法であることを特徴とする、請求項8または9記載の分析方法。 - 前記ヘモグロビンが、ヘモグロビンA1cであることを特徴とする、請求項1から11のいずれか一項に記載の分析方法。
- 前記ヘモグロビンA1cが、安定型ヘモグロビンA1cおよび不安定型ヘモグロビンA1cの少なくとも一方であることを特徴とする、請求項12記載の分析方法。
- 前記ヘモグロビンが、カルバミル化ヘモグロビン、アルデヒド化ヘモグロビンおよびアセチル化ヘモグロビンからなる群から選択される少なくとも一種の修飾ヘモグロビンであることを特徴とする、請求項1から13のいずれか一項に記載の分析方法。
- 前記炭素環カルボン酸が、シクロヘキサンカルボン酸であることを特徴とする、請求項1から14のいずれか一項に記載の分析方法。
- 前記シクロヘキサンカルボン酸が、トランス−1,2−シクロヘキサンジアミン−N,N,N’,N’−四酢酸(CyDTA)、1,1−シクロヘキサン二酢酸、(1α,2α,4α)−1,2,4−シクロヘキサントリカルボン酸および1,2,3,4,5,6−シクロヘキサンヘキサカルボン酸一水和物からなる群から選択された少なくとも一つであることを特徴とする、請求項15記載の分析方法。
- 緩衝剤および分離改善剤を含み、
前記分離改善剤が、炭素環カルボン酸およびL−グルタミン酸の少なくとも一方の酸性物質を含み、
前記酸性物質の少なくとも二つのカルボキシル基の酸解離定数(pK a )が、分析時の前記泳動液のpHよりも低いことを特徴とする、
請求項1から16のいずれか一項に記載の分析方法に用いる分離改善剤を含む泳動液試薬。 - 前記緩衝剤の緩衝能に関与する酸解離定数(pK a )から、前記分離改善剤の前記酸性物質のカルボキシル基の第二解離定数(pK a2 )を引いた差が、0.2以上であることを特徴とする、請求項17記載の泳動液試薬。
- 前記炭素環カルボン酸が、シクロヘキサンカルボン酸であることを特徴とする、請求項17または18記載の泳動液試薬。
- 前記シクロヘキサンカルボン酸が、トランス−1,2−シクロヘキサンジアミン−N,N,N’,N’−四酢酸(CyDTA)、1,1−シクロヘキサン二酢酸、(1α,2α,4α)−1,2,4−シクロヘキサントリカルボン酸および1,2,3,4,5,6−シクロヘキサンヘキサカルボン酸一水和物からなる群から選択された少なくとも一つであることを特徴とする、請求項19記載の泳動液試薬。
- 炭素環カルボン酸およびL−グルタミン酸の少なくとも一方の酸性物質を含み、
前記酸性物質の少なくとも二つのカルボキシル基の酸解離定数(pKa)が、分析時の前記泳動液のpHよりも低いことを特徴とする、請求項1から16のいずれか一項に記載の分析方法に用いる分離改善剤。 - 前記炭素環カルボン酸が、シクロヘキサンカルボン酸であることを特徴とする、請求項21記載の分離改善剤。
- 前記シクロヘキサンカルボン酸が、トランス−1,2−シクロヘキサンジアミン−N,N,N’,N’−四酢酸(CyDTA)、1,1−シクロヘキサン二酢酸、(1α,2α,4α)−1,2,4−シクロヘキサントリカルボン酸および1,2,3,4,5,6−シクロヘキサンヘキサカルボン酸一水和物からなる群から選択された少なくとも一つであることを特徴とする、請求項22記載の分離改善剤。
- 請求項21から23のいずれか一項に記載の分離改善剤を含むことを特徴とする、分析キット。
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