NIR Spectroscopy in Food and Feed: What It Measures and Where It Fails NIR spectroscopy in food and feed measures protein, moisture, and fat in seconds. Learn what it does well, where it fails, and how to get reliable results. <p>A feed mill in the Midwest added canola meal to its formulations and kept running the same corn-soy calibration. Protein predictions were off by more than 3 percentage points. That's not a minor variance — at those volumes, it's a formulation problem that can cost you a customer. I see versions of this story regularly when I visit plants. NIR is a powerful tool, but only when the people running it understand what it actually measures and where it breaks down.</p> <p>NIR spectroscopy uses light in the 780 nm to 2500 nm range to analyze materials without destroying them. When NIR light hits a sample, it causes molecular bonds to vibrate at specific frequencies. Those vibrations — called overtone and combination bands — are unique to bonds like C-H, O-H, and N-H.</p> <p>That's what makes NIR useful for measuring protein, moisture, fat, and fiber. Each component has a distinct spectral signature. The instrument reads that signature and — through a calibration model — converts it into a number you can act on.</p> <h2>What NIR Spectroscopy Actually Measures</h2> <h2>How NIR Builds a Spectral Fingerprint</h2> <p>External Resources: <a href="https://opg.optica.org/as/abstract.cfm?uri=as-54-2-239">https://opg.optica.org/as/abstract.cfm?uri=as-54-2-239</a> | <a href="https://pmc.ncbi.nlm.nih.gov/articles/PMC12731082/">https://pmc.ncbi.nlm.nih.gov/articles/PMC12731082/</a> | <a href="https://www.bluesunscientific.com/post/choosing-between-nir-and-wet-chemistry-a-lab-manager-s-guide">https://www.bluesunscientific.com/post/choosing-between-nir-and-wet-chemistry-a-lab-manager-s-guide</a></p> ← Back to NIR Spectroscopy Blog