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Method for quantitative NIR spectroscopic analysis

  • US 5,536,664 A
  • Filed: 05/09/1995
  • Issued: 07/16/1996
  • Est. Priority Date: 06/27/1994
  • Status: Expired due to Term
First Claim
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1. A method of quantitatively analyzing an analyte of a biological sample by near infrared (NIR) reflective or scattering spectroscopic quantitative analysis, comprising the steps of:

  • a) placing an aliquot of sample onto a test element comprising, in overlying relation,a support, anda substantially constant light-path providing layer consisting essentially of a diffusely-reflecting material that i) is sufficiently porous in all directions as to allow a liquid to spread uniformly in all directions, and ii) homogeneously and diffusively reflects at least 95% of NIR radiation,b) illuminating the sample within said test element with light of NIR wavelengths,c) detecting light of such wavelength that is reflected or scattered by said test element, andd) spectroscopically analyzing the detected light for signals that are characteristic of the analyte being analyzed, said test element being substantially free of reagents during said steps a)-d).

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