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Near-Infrared Spectroscopy Probes Food Freshness

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Critical advances will allow nondestructive monitoring of agricultural products.

DIETER BINGEMANN, OCEAN OPTICS INC.

Near-infrared (NIR) spectroscopy is well-suited to analysis of bulk, high-moisture agricultural samples such as fruit, grains, fish and meat. Light at NIR wavelengths penetrates samples with less scattering than other techniques, allowing internal composition to be analyzed nondestructively. Although NIR spectra are often broad, overlapping and complex, statistical modeling can be used to unlock their secrets. Figure 1. Longer NIR wavelengths that aren’t scattered by the surface of fruit samples pass through the peel to reveal characteristics of the pulp underneath. Courtesy of...Read full article

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