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<p>Cartilage is a connective tissue composed of mainly water, collagen (COL) and proteoglycans (PGs) including chondroitin sulfate (CS). Near-infrared (NIR) spectroscopy is adequate for examination of soft and hard tissues with large amount of water non-destructively and non-invasively. We measured tablets containing CS and COL using NIR spectroscopy to develop an evaluation method for PGs in cartilage non-destructively and non-invasively. Calibration curves were constructed using the NIR spectra of the tablets that show the quantitative linear relationship between the concentration and height of the second derivative at 4260&#xa0;cm<sup>−1</sup> for COL and at 5800&#xa0;cm<sup>−1</sup> for COL and CS. An equation to calculate the CS-to-COL ratio was derived from the calibrated slopes at 5800 and 4260&#xa0;cm<sup>−1</sup>, and the utility of the equation was demonstrated by the evaluation of tablets. Moreover, we conducted an evaluation of the CS-to-COL ratio in the aqueous nucleus pulposus and annulus fibrosus, and the results were consistent with the glycosaminoglycans (GAGs)-to-COL ratios obtained through Raman spectroscopy of the same specimens. Thus, this method is adequate for evaluating PGs with large amount of water non-destructively, non-invasively and with less damage.</p> Graphical abstract <p></p>

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Evaluation method for proteoglycans using near-infrared spectroscopy

  • 期刊论文

  • 发表日期：

    2025年1月24日

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  • Fumiya Nakamura,
  • Tomoki Ikemizu,
  • Miu Murao,
  • Takashi Isoshima,
  • Daiji Kobayashi,
  • Hideyuki Mitomo,
  • Kuniharu Ijiro,
  • Hiromi Kimura-Suda

摘要

Cartilage is a connective tissue composed of mainly water, collagen (COL) and proteoglycans (PGs) including chondroitin sulfate (CS). Near-infrared (NIR) spectroscopy is adequate for examination of soft and hard tissues with large amount of water non-destructively and non-invasively. We measured tablets containing CS and COL using NIR spectroscopy to develop an evaluation method for PGs in cartilage non-destructively and non-invasively. Calibration curves were constructed using the NIR spectra of the tablets that show the quantitative linear relationship between the concentration and height of the second derivative at 4260 cm−1 for COL and at 5800 cm−1 for COL and CS. An equation to calculate the CS-to-COL ratio was derived from the calibrated slopes at 5800 and 4260 cm−1, and the utility of the equation was demonstrated by the evaluation of tablets. Moreover, we conducted an evaluation of the CS-to-COL ratio in the aqueous nucleus pulposus and annulus fibrosus, and the results were consistent with the glycosaminoglycans (GAGs)-to-COL ratios obtained through Raman spectroscopy of the same specimens. Thus, this method is adequate for evaluating PGs with large amount of water non-destructively, non-invasively and with less damage.

Graphical abstract