拡散反射光源 L16462-01 と当社製近赤外分光器 FTIR エンジンを用いて、テオフィリン濃度が異なる6種の錠剤を、PLS 回帰分析*2 を用いてテオフィリンのみを定量的に測定しました。
事前に取得したトレーニングデータ*3 から検量線を作成し、PLS 回帰分析することで、テオフィリン含有量を予測しています。
検量線で決定係数 R2=0.998 となり、高精度の測定ができていることがわかります。
1100 nm ～ 2000 nm と2000 nm ～ 2500 nm の2つの波長域において、市販光源と当社製拡散反射光源 L16462-01 を用いて上記と同様にPLS 回帰分析でテオフィリン濃度をそれぞれ計測し、精度予測しました。
一般的な市販光源は、2000 nm 以上の長波長域における定量精度が低くなります。一方で、当社製拡散反射光源は2500 nm までの近赤外域において高い検出効率を実現しているため、市販光源と比較して2000 nm 以上の測定においても高い定量精度を実現しています。
|1100 nm 〜 2000 nm||2000 nm 〜 2500 nm||1100 nm 〜 2000 nm||2000 nm 〜 2500 nm|
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