JPWO2013161675A1 - 血清又は血漿中のアスコルビン酸の安定化方法 - Google Patents
血清又は血漿中のアスコルビン酸の安定化方法 Download PDFInfo
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- JPWO2013161675A1 JPWO2013161675A1 JP2014512508A JP2014512508A JPWO2013161675A1 JP WO2013161675 A1 JPWO2013161675 A1 JP WO2013161675A1 JP 2014512508 A JP2014512508 A JP 2014512508A JP 2014512508 A JP2014512508 A JP 2014512508A JP WO2013161675 A1 JPWO2013161675 A1 JP WO2013161675A1
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- serum
- ascorbic acid
- plasma
- whole blood
- blood cells
- Prior art date
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- UJMBCXLDXJUMFB-GLCFPVLVSA-K tartrazine Chemical compound [Na+].[Na+].[Na+].[O-]C(=O)C1=NN(C=2C=CC(=CC=2)S([O-])(=O)=O)C(=O)C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 UJMBCXLDXJUMFB-GLCFPVLVSA-K 0.000 description 1
- 239000004149 tartrazine Substances 0.000 description 1
- WBWWGRHZICKQGZ-GIHLXUJPSA-N taurocholic acid Chemical compound C([C@@H]1C[C@H]2O)[C@@H](O)CC[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@@H]([C@@H](CCC(=O)NCCS(O)(=O)=O)C)[C@@]2(C)[C@H](O)C1 WBWWGRHZICKQGZ-GIHLXUJPSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- JADVWWSKYZXRGX-UHFFFAOYSA-M thioflavine T Chemical compound [Cl-].C1=CC(N(C)C)=CC=C1C1=[N+](C)C2=CC=C(C)C=C2S1 JADVWWSKYZXRGX-UHFFFAOYSA-M 0.000 description 1
- SWGJCIMEBVHMTA-UHFFFAOYSA-K trisodium;6-oxido-4-sulfo-5-[(4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-2-sulfonate Chemical compound [Na+].[Na+].[Na+].C1=CC=C2C(N=NC3=C4C(=CC(=CC4=CC=C3O)S([O-])(=O)=O)S([O-])(=O)=O)=CC=C(S([O-])(=O)=O)C2=C1 SWGJCIMEBVHMTA-UHFFFAOYSA-K 0.000 description 1
- 229940116269 uric acid Drugs 0.000 description 1
- RUDATBOHQWOJDD-UZVSRGJWSA-N ursodeoxycholic acid Chemical compound C([C@H]1C[C@@H]2O)[C@H](O)CC[C@]1(C)[C@@H]1[C@@H]2[C@@H]2CC[C@H]([C@@H](CCC(O)=O)C)[C@@]2(C)CC1 RUDATBOHQWOJDD-UZVSRGJWSA-N 0.000 description 1
- 229960001661 ursodiol Drugs 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 239000011782 vitamin Substances 0.000 description 1
- 150000003722 vitamin derivatives Chemical class 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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Abstract
Description
アスコルビン酸は非常に酸化されやすい物質であるため、測定法の種類を問わず、例えば検体が血液の場合は除蛋白上清を速やかに凍結しなければならない等、煩雑な安定化処理が必須であった(非特許文献1)。
[1] 血清又は血漿中のアスコルビン酸を、全血中の血球を溶血させない浸透圧を有する水性媒体中に血球の共存下で保存することを特徴とする、血漿又は血清中のアスコルビン酸の安定化方法。
[2] 保存が、-1℃〜15℃での保存である[1]記載の安定化方法。
[3] 全血中の血球を溶血させない浸透圧を有する水性媒体が、0.5%〜2.0%の食塩水と等しい浸透圧を有する水性媒体である[1]又は[2]記載の安定化方法。
[4] 全血中の血球を溶血させない浸透圧を有する水性媒体、血清又は血漿、及び、血球の総容量に対する、血清又は血漿、及び、血球の容量の割合が、0.1%〜70%である[1]〜[3]のいずれかに記載の安定化方法。
[6] 保存が、-1℃〜15℃での保存である[5]記載の保存方法。
[7] 全血中の血球を溶血させない浸透圧を有する水性媒体が、0.5%〜2.0%の食塩水と等しい浸透圧を有する水性媒体である[5]又は[6]記載の保存方法。
[8] 全血中の血球を溶血させない浸透圧を有する水性媒体、血清又は血漿、及び、血球の総容量に対する、血清又は血漿、及び、血球の容量の割合が、0.1%〜70%である[5]〜[7]のいずれかに記載の保存方法。
[10] 以下の工程を含むことを特徴とする、血清又は血漿中のアスコルビン酸の測定方法。
(1)全血を全血中の血球を溶血させない浸透圧を有する水性媒体で希釈し、全血溶液を調製する工程;
(2)工程(1)で調製した全血溶液を保存する工程;
(3)工程(2)の全血溶液中の血球と血清又は血漿とを分離する工程;
(4)工程(3)で分離された血清又は血漿中のアスコルビン酸濃度を測定する工程;
(5)工程(3)で分離された血清又は血漿の、全血中の血球を溶血させない浸透圧を有する水性媒体に対する希釈倍率を算出する工程;
(6)工程(4)で測定されたアスコルビン酸濃度と、工程(5)で算出された希釈倍率とから、血清又は血漿中のアスコルビン酸濃度を決定する工程。
[11] 希釈倍率が、ヘマトクリット値を用いて算出される[10]記載の測定方法。
[12] 希釈倍率が、既知濃度の対照成分を用いて算出される[10]記載の測定方法。
[13] 対照成分が、色素、色原体、蛍光物質、発光物質、及び、血清又は血漿中に一定濃度で含まれる成分からなる群より選ばれる物質である、[12]記載の測定方法。
[14] 工程(4)におけるアスコルビン酸濃度の測定が、アスコルビン酸から過酸化水素を生成させるアスコルビン酸酸化酵素を用いて行なわれる、[10]〜[13]のいずれかに記載の測定方法。
[15] 工程(2)における全血溶液の保存が、-1℃〜15℃での保存である[10]〜[14]のいずれかに記載の測定方法。
[16] 工程(1)における全血中の血球を溶血させない浸透圧を有する水性媒体が、0.5%〜2.0%の食塩水と等しい浸透圧を有する水性媒体である[10]〜[15]のいずれかに記載の測定方法。
[17] 工程(1)における全血中の血球を溶血させない浸透圧を有する水性媒体、血清又は血漿、及び、血球の総容量に対する、血清又は血漿、及び、血球の容量の割合が、0.1%〜70%である[10]〜[16]のいずれかに記載の測定方法。
(1)全血を全血中の血球を溶血させない浸透圧を有する水性媒体で希釈し、全血溶液を調製する工程;
(2)工程(1)で調製した全血溶液を保存する工程;
(3)工程(2)の全血溶液中の血球と血清又は血漿とを分離する工程;
(4)工程(3)で分離された血清又は血漿中のアスコルビン酸濃度を測定する工程;
(5)当該全血由来の血清又は血漿の、工程(3)で分離された血清又は血漿に対する希釈倍率を算出する工程;
(6)工程(4)で測定されたアスコルビン酸濃度と、工程(5)で算出された希釈倍率とから、血清又は血漿中のアスコルビン酸濃度を決定する工程。
(1)全血と、既知濃度(d)の対照成分を含有し、全血中の血球を溶血させない浸透圧を有する水性媒体とを混合して、全血溶液を調製する工程;
(2)工程(1)で調製した全血溶液を保存する工程;
(3)工程(2)で保存した全血溶液中の血球と血清又は血漿とを分離する工程;
(4)工程(3)で分離された血清又は血漿中のアスコルビン酸濃度(z)を測定する工程;
(5)工程(3)で分離された血清又は血漿中の対照成分濃度(D)を測定する工程;
(6)式(IV)により、当該全血由来の血清又は血漿の、工程(3)で分離された血清又は血漿に対する希釈倍率を算出する工程;
還元発色型色原体としては、例えば、3−(4,5−ジメチルー2−チアゾリル)−2,5−ジフェニル−2H−テトラゾリウム ブロミド(MTT)、2−(4−ヨードフェニル)−3−(4−ニトロフェニル)−5−(2,4(ジスルホフェニル)一2H−テトラゾリウム モノナトリウム塩(WST−1)、2−(4−ヨードフェニル)−3−(2,4−ジニトロフェニル)−5−(2,4−ジスルホフェニル)−2H−テトラゾリウム モノナトリウム塩(WST−3)等が挙げられる。
尚、本実施例、比較例及び試験例においては、下記メーカーの試薬及び酵素を使用した。
MES(同仁化学研究所社製)、塩化ナトリウム(和光純薬工業社製)、塩化カリウム(和光純薬工業社製)、EDTA・2Na(同仁化学研究所社製)、ノニオンHS−210(非イオン性界面活性剤;日油社製)、MCDP(ロイコ型色原体;協和メデックス社製)、アスコルビン酸酸化酵素III天野(アスコルビン酸酸化酵素;アマノエンザイム社製)、アスコルビン酸(和光純薬工業社製)、ペルオキシダーゼ(東洋紡績社製)、デオキシコール酸(和光純薬工業社製)。
(1)全血中の血球を溶血させない浸透圧を有する水性媒体の調製
塩化ナトリウム水溶液(塩化ナトリウム濃度:0.9%)を、全血中の血球を溶血させない浸透圧を有する水性媒体とした。
(2)測定用試料の調製
健常者から採血した全血0.1 mLを(1)の水溶液0.2 mLに混合した。容積比A、すなわち、全血に対する(1)の水溶液の容積比は2となる。
以下の組成からなるアスコルビン酸測定用キットを調製した。
第1試薬
MES(pH5.5) 0.05 mol/L
塩化カリウム 9 g/L
EDTA・2Na 0.5 g/L
ノニオンHS−210 1 g/L
MCDP 0.025 g/L
第2試薬
MES(pH5.5) 0.05 mol/L
塩化カリウム 1.5 g/L
アスコルビン酸酸化酵素 200 kU/L
ペルオキシダーゼ 1 kU/L
以下の組成からなるアスコルビン酸測定用標準液を調製した。
EDTA・2Na 0.1 g/L
アスコルビン酸 50 mg/L
上記(4)で調製したアスコルビン酸測定用標準液30μLに(3)で調製したキットの第1試薬2 mLを添加し、37℃で5分間加温後、第1試薬1 mLを添加し、37℃で5分間加温した後の反応液の吸光度を、波長660 nmで測定し、アスコルビン酸濃度と吸光度との関係を示す検量線を作成した。
同様の操作を、健常者の血清(全血由来の血清)についても行い、得られた吸光度を(5)で作成した検量線に関連付けることにより、血清中のアスコルビン酸濃度を決定した。決定されたアスコルビン酸濃度を第1表に記す。
上記と同一の健常者より採取した全血から調製した上記(2)の測定用試料を2,000 rpmで2分間遠心分離し、その上清のアスコルビン酸濃度z(μg/mL)を上記と同様に決定した。
上記と同一の健常者から採血した全血をヘマトクリット毛細管(テルモ株式会社製)に採取し、ミクロヘマトクリット法にてヘマトクリット値Ht%を測定した。
測定用試料調製に使用された全血に由来する血清中のアスコルビン酸の濃度v(μg/mL)を式(II)により算出した。ここで、全血中の血球を溶血させない浸透圧を有する水性媒体の容量の、当該全血の容量に対する比(A)は上記(2)より2であることから、vは以下の式(VI)で算出される。
(1)全血中の血球を溶血させない浸透圧を有する水性媒体の調製
以下の組成からなる全血中の血球を溶血させない浸透圧を有する水性媒体を調製した。
塩化ナトリウム 0.9%
デオキシコール酸ナトリウム 1 mmol/L
(2)測定用試料の調製
健常者から採血した全血0.1 mLを(1)の水溶液0.2 mLに混合した。
(3)アスコルビン酸測定用キットの調製
実施例1の(3)のアスコルビン酸測定用キットを調製した。
(4)アスコルビン酸測定用標準液の調製
実施例1の(4)のアスコルビン酸測定用標準液を調製した。
(5)検量線の作成
実施例1の(5)と同様に、上記(4)で調製したアスコルビン酸測定用標準液を用いて、アスコルビン酸濃度と吸光度との関係を示す検量線を作成した。
同様の操作を、健常者の血清(全血由来の血清)についても行い、得られた吸光度を(5)で作成した検量線に関連付けることにより、血清中のアスコルビン酸濃度を決定した。決定されたアスコルビン酸濃度を第2表に記す。
(7)測定用試料中のアスコルビン酸の測定
上記と同一の健常者より採取した全血から調製した上記(2)の測定用試料を2,000 rpmで2分間遠心分離し、その上清のアスコルビン酸濃度Z(μg/mL)を上記と同様に決定した。
(8)測定用試料中のデオキシコール酸(対照成分)の測定
上記(2)の測定用試料を2,000 rpmで2分間遠心分離して得られた上清中のデオキシコール酸濃度D (mmol/L)を、デオキシコール酸測定用キット「アクアオートカイノス TBA試薬」(カイノス社製)を用いて測定した。
(9)血清の希釈倍率の決定
ここで、用いた全血由来の血清の希釈倍率は、式(V)にdとして1 (mmol/L)を代入した式(VII)で表わされる。
上記(7)で決定された測定用試料中のアスコルビン酸濃度Z(μg/mL)と、上記(9)で決定された希釈倍率とから、測定用試料調製に使用された全血に由来する血清中のアスコルビン酸の濃度V(μg/mL)は、以下の式(VIII)で表わされることになる。
5名の健常者A,B,C,D,Eから採血した全血を用いて、除蛋白上清検体、血清検体を調製した。除蛋白上清検体は、血清に10%濃度のメタリン酸を等量添加した後に十分混和し、遠心分離により蛋白を除くことにより調製した。血清検体は、全血を遠心分離(1,200 G×10分間)することにより調製した。
(1)全血を用いた検討
実施例3で最も保存安定性が悪かった健常者Aから採血した全血(α)を用いて、除蛋白上清検体、血清検体、及び、測定用試料を調製した。除蛋白上清検体は、血清に10%濃度のメタリン酸を等量添加した後に十分混和し、遠心分離により蛋白を除くことにより調製した。血清検体は、全血を遠心分離(1,200 G×10分間)することにより調製した。全血中の血球を溶血させない浸透圧を有する水性媒体として塩化ナトリウム水溶液(塩化ナトリウム濃度:0.9%)を用い、全血と、0.9%塩化ナトリウム水溶液とを混合して、全血と当該水溶液の総容量に対する全血の容量の割合が(1)70%、(2)50%、(3)33%、(4)20%、(5)12%、(6)6%、(7)3%である測定用試料(1)〜(7)を調製した。
全血に4,000μg/mLとなる様にアスコルビン酸を添加して調製したアスコルビン酸高値疑似全血と、塩化ナトリウム水溶液(塩化ナトリウム濃度:0.9%)とを混合して、アスコルビン酸高値疑似全血と当該水溶液の総容量に対するアスコルビン酸高値疑似全血の容量の割合が(8)70%、(9)50%、(10)33%、(11)20%、(12)12%、(13)6%、(14)3%、(15)1.5%、(16)0.75%、(17)0.2%、(18)0.1%である測定用試料(8)〜(14)を調製した。測定用試料(8)〜(14)を用いる以外は(1)と同様の方法により、保存期間中のアスコルビン酸の安定性を評価した。その結果を第5表に記す。
(1)全血中の血球を溶血させない浸透圧を有する水性媒体の調製
塩化ナトリウム水溶液(塩化ナトリウム濃度:0.5〜2.0%)を、全血中の血球を溶血させない浸透圧を有する水性媒体とした。
(2)アスコルビン酸高値疑似全血の調製
健常者から採血した全血にアスコルビン酸を添加し、2,000μg/mLのアスコルビン酸高値疑似全血を調製した。
(3)測定用試料の調製
上記(2)で調製したアスコルビン酸高値疑似全血と、(1)の塩化ナトリウム水溶液とを混合し、アスコルビン酸高値疑似全血と(1)の塩化ナトリウム水溶液の総容量に対するアスコルビン酸高値疑似全血の容積の割合が70%、50%、33%、20%、12%、6%、3%、1.5%、0.75%、0.2%である測定用試料を調製した。
上記(2)のアスコルビン酸高値疑似全血、及び、上記(3)で調製した各測定用試料を5℃に保存し、保存直後から4日後までの各試料由来の血清中のアスコルビン酸濃度を、実施例1と同様の方法で決定した。尚、全血及び各測定用試料由来の血清中のアスコルビン酸濃度の測定に際しては、実施例1と同様に、全血及び各測定用試料より分離した上清を用いた。
(1)全血中の血球を溶血させない浸透圧を有する水性媒体の調製
塩化ナトリウム濃度水溶液(塩化ナトリウム濃度:1.0%)を、全血中の血球を溶血させない浸透圧を有する水性媒体とした。
(2)測定用試料の調製
健常者から採血した全血にアスコルビン酸を添加し、4,000μg/mLのアスコルビン酸高値疑似全血を調製した。
(3)測定用試料の調製
上記(2)で調製したアスコルビン酸高値疑似全血と、(1)の水溶液とを混合し、アスコルビン酸高値疑似全血と(1)の水溶液の総容量に対するアスコルビン酸高値疑似全血の容積の割合が70%、50%、33%、20%、12%、6%、3%、1.5%、0.75%、0.2%、0.1%である測定用試料を調製した。
上記(2)のアスコルビン酸高値疑似全血の調製に使用した全血、及び、上記(3)で調製した各測定用試料を-1℃、2℃、5℃、8℃、10℃、15℃の各温度で保存し、保存直後から4日後までの各試料由来の血清中のアスコルビン酸濃度を、実施例1と同様の方法で決定した。尚、アスコルビン酸高値疑似全血及び各測定用試料由来の血清中のアスコルビン酸濃度の測定に際しては、実施例1と同様に、アスコルビン酸高値疑似全血及び各測定用試料より分離した上清を用いた。
Claims (17)
- 血清又は血漿中のアスコルビン酸を、全血中の血球を溶血させない浸透圧を有する水性媒体中に血球の共存下で保存することを特徴とする、血漿又は血清中のアスコルビン酸の安定化方法。
- 保存が、-1℃〜15℃での保存である請求項1記載の安定化方法。
- 全血中の血球を溶血させない浸透圧を有する水性媒体が、0.5%〜2.0%の食塩水と等しい浸透圧を有する水性媒体である請求項1又は2記載の安定化方法。
- 全血中の血球を溶血させない浸透圧を有する水性媒体、血清又は血漿、及び、血球の総容量に対する、血清又は血漿、及び、血球の容量の割合が、0.1%〜70%である請求項1〜3のいずれかに記載の安定化方法。
- 血清又は血漿中のアスコルビン酸を、全血中の血球を溶血させない浸透圧を有する水性媒体中に血球の共存下で保存することを特徴とする、血漿又は血清中のアスコルビン酸の保存方法。
- 保存が、-1℃〜15℃での保存である請求項5記載の保存方法。
- 全血中の血球を溶血させない浸透圧を有する水性媒体が、0.5%〜2.0%の食塩水と等しい浸透圧を有する水性媒体である請求項5又は6記載の保存方法。
- 全血中の血球を溶血させない浸透圧を有する水性媒体、血清又は血漿、及び、血球の総容量に対する、血清又は血漿、及び、血球の容量の割合が、0.1%〜70%である請求項5〜7のいずれかに記載の保存方法。
- 請求項5〜8記載のいずれかの保存方法により保存された血漿又は血清を用いることを特徴とする、血漿又は血清中のアスコルビン酸の測定方法。
- 以下の工程を含むことを特徴とする、血清又は血漿中のアスコルビン酸の測定方法。
(1)全血を全血中の血球を溶血させない浸透圧を有する水性媒体で希釈し、全血溶液を調製する工程;
(2)工程(1)で調製した全血溶液を保存する工程;
(3)工程(2)の全血溶液中の血球と血清又は血漿とを分離する工程;
(4)工程(3)で分離された血清又は血漿中のアスコルビン酸濃度を測定する工程;
(5)工程(3)で分離された血清又は血漿の、全血中の血球を溶血させない浸透圧を有する水性媒体に対する希釈倍率を算出する工程;
(6)工程(4)で測定されたアスコルビン酸濃度と、工程(5)で算出された希釈倍率とから、血清又は血漿中のアスコルビン酸濃度を決定する工程。 - 希釈倍率が、ヘマトクリット値を用いて算出される請求項10記載の測定方法。
- 希釈倍率が、既知濃度の対照成分を用いて算出される請求項10記載の測定方法。
- 対照成分が、色素、色原体、蛍光物質、発光物質、及び、血清又は血漿中に一定濃度で含まれる成分からなる群より選ばれる物質である、請求項12記載の測定方法。
- 工程(4)におけるアスコルビン酸濃度の測定が、アスコルビン酸から過酸化水素を生成させるアスコルビン酸酸化酵素を用いて行なわれる、請求項10〜13のいずれかに記載の測定方法。
- 工程(2)における全血溶液の保存が、-1℃〜15℃での保存である請求項10〜14のいずれかに記載の測定方法。
- 工程(1)における全血中の血球を溶血させない浸透圧を有する水性媒体が、0.5%〜2.0%の食塩水と等しい浸透圧を有する水性媒体である請求項10〜15のいずれかに記載の測定方法。
- 工程(1)における全血中の血球を溶血させない浸透圧を有する水性媒体、血清又は血漿、及び、血球の総容量に対する、血清又は血漿、及び、血球の容量の割合が、0.1%〜70%である請求項10〜16のいずれかに記載の測定方法。
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