Yes, NIR can measure protein content in grain using calibration models that relate near-infrared absorption patterns to protein concentrations established by reference methods. It is commonly used for rapid, non-destructive grain assessment, with accuracy depending on grain type, calibration quality, moisture, and sample presentation.
How NIR Measures Grain Protein Content
Near-infrared spectroscopy measures light absorption associated with molecular bonds, including N-H bonds found in proteins. The resulting spectrum contains information that can be used to estimate protein content through chemometric calibration.
NIR protein analysis is used in grain handling, storage, processing, and quality assessment. It can support decisions about grain classification, blending, and suitability for particular processing applications without requiring lengthy chemical testing for every sample.
Reliable results depend on calibration models developed using representative grain samples and suitable laboratory reference measurements. Grain variety, moisture, temperature, kernel size, and sample presentation can affect the spectrum. Whole-grain and ground-grain measurements may also require different calibrations, so the selected method should be validated for routine use.
Assessing NIR for Grain Quality Testing
For further information, review PAS’s overview of Near Infrared Spectroscopy technology. To compare suitable instruments, explore the range of NIR analysers from Portable Analytical Solutions, or contact our team to discuss grain types, protein measurement, and calibration requirements.