JP2018087809A - 生物粒子計数システムおよび生物粒子計数方法 - Google Patents
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Abstract
Description
、上述したように前段照射部2における紫外線照射によって増加しないため、第1測定信号および第2測定信号の値の少なくとも一方が所定の閾値を超えにくくなり、その非生物粒子が生物粒子として計数されにくくなる。なお、非生物粒子の場合において第1測定信号および第2測定信号の値がそれぞれ所定の閾値を超えたとしても、第1波長範囲の光強度が第2波長範囲の光強度より低くなるので、生物粒子として計数されない。
2,51 前段照射部
Claims (9)
- 流体に励起光を照射し前記流体内の生物粒子の自家蛍光を検出して前記流体内の前記生物粒子を計数する生物粒子計数部と、
前記生物粒子計数部の前段に設けられ、前記流体となる試料に対して紫外線を照射する前段照射部とを備え、
前記紫外線は、前記生物粒子内の第1自家蛍光物質の蛍光強度を増加する深紫外領域の紫外線であって、
前記生物粒子計数部は、前記第1自家蛍光物質の蛍光波長を含む第1波長範囲の光強度を測定するとともに特定の第2波長範囲の光強度を測定し、測定した前記第1波長範囲の光強度および測定した前記特定の第2波長範囲の光強度に基づいて前記流体内の非生物粒子と区別して前記生物粒子を計数すること、
を特徴とする生物粒子計数システム。 - 前記生物粒子計数部は、(a)測定した前記第1波長範囲の光強度および測定した前記第2波長範囲の光強度が、それぞれ所定の閾値より高い場合には、測定した前記第1波長範囲の光強度および測定した前記第2波長範囲の光強度に基づいて前記流体内の非生物粒子と区別して前記生物粒子を計数し、(b)測定した前記第1波長範囲の光強度および測定した前記第2波長範囲の光強度の少なくとも一方が前記閾値以下である場合には、測定した前記第1波長範囲の光強度および測定した前記第2波長範囲の光強度に拘わらず、前記生物粒子を計数せず、
前記所定の閾値は、前記紫外線の照射による前記第1波長範囲での光強度の増加分および前記第2波長範囲での光強度の増加分に応じた値にそれぞれ設定されること、
を特徴とする請求項1記載の生物粒子計数システム。 - 前記第2波長範囲は、前記励起光の波長と前記第1波長範囲との間において、前記紫外線で蛍光強度が増加される前記生物粒子内の自家蛍光物質の蛍光ピーク波長が含まれない所定の波長範囲であって、
前記生物粒子計数部は、測定した前記第1波長範囲の光強度が、測定した前記第2波長範囲の光強度より高い場合に、前記生物粒子を計数すること、
を特徴とする請求項1記載の生物粒子計数システム。 - 前記流体は液体であって、
前記第2波長範囲は、前記励起光の波長と前記液体によるラマン散乱光のピーク波長との間において、前記紫外線で蛍光強度が増加される前記生物粒子内の自家蛍光物質の蛍光ピーク波長が含まれない所定の波長範囲であること、
を特徴とする請求項3記載の生物粒子計数システム。 - 前記第2波長範囲は、前記第1自家蛍光物質とは別の、前記紫外線で蛍光強度が増加される前記生物粒子内の第2自家蛍光物質の蛍光波長を含む所定の波長範囲であって、
前記生物粒子計数部は、測定した前記第1波長範囲の光強度と測定した前記第2波長範囲の光強度との差分が所定範囲内である場合に、前記生物粒子を計数すること、
を特徴とする請求項1記載の生物粒子計数システム。 - 前記生物粒子計数部は、前記第1波長範囲の光強度および前記第2波長範囲の光強度を測定するとともに、前記第1波長範囲および前記第2波長範囲以外の少なくとも1つの追加波長範囲の光強度を測定し、測定した前記第1波長範囲の光強度、測定した前記第2波長範囲の光強度、および測定した前記追加波長範囲の光強度に基づいて、前記流体内の非生物粒子と区別して前記生物粒子を計数すること特徴とする請求項1から請求項5のうちのいずれか1項記載の生物粒子計数システム。
- 前記生物粒子計数部は、波長に対する光強度の特性における、測定した前記第1波長範囲の光強度と測定した前記特定の第2波長範囲の光強度とによる傾き、および測定した前記第1波長範囲の光強度と測定した前記追加波長範囲の光強度とによる傾きに基づいて、前記流体内の非生物粒子と区別して前記生物粒子を計数すること特徴とする請求項6記載の生物粒子計数システム。
- 前記生物粒子計数部は、前記第1波長範囲の光強度および前記第2波長範囲の光強度を測定するとともに、前記第1波長範囲および前記第2波長範囲以外の2つの追加波長範囲の光強度を測定し、
前記2つの追加波長範囲のうちの一方は、前記第1波長範囲より短波長であり、
前記2つの追加波長範囲のうちの他方は、前記第1波長範囲より長波長であること、
を特徴とする請求項6記載の生物粒子計数システム。 - 生物粒子計数部の前段において、試料に対して紫外線を照射するステップと、
前記紫外線が照射された前記試料を流体として前記生物粒子計数部に流入させ、前記生物粒子計数部において前記流体に励起光を照射し前記流体内の生物粒子の自家蛍光を検出して前記流体内の前記生物粒子を計数するステップとを備え、
前記紫外線は、前記生物粒子内の第1自家蛍光物質の蛍光強度を増加する深紫外領域の紫外線であって、
前記生物粒子計数部では、前記第1自家蛍光物質の蛍光波長を含む第1波長範囲の光強度を測定するとともに特定の第2波長範囲の光強度を測定し、測定した前記第1波長範囲の光強度および測定した前記特定の第2波長範囲の光強度に基づいて前記流体内の非生物粒子と区別して前記生物粒子を計数すること、
を特徴とする生物粒子計数方法。
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