UV-VIS spectroscopy is commonly used to measure ______[Fill in the blank]

Question

BlackTom AI · Accepted Answer

To start, we examine what UV-VIS spectroscopy is typically used for in food analysis and which measurable properties are associated with absorption in the ultraviolet and visible range.
Option a: Chlorophyll content of food. This is correct because chlorophyll and related pigments have characteristic absorption peaks in the visible region, allowing their concentration to be estimated from absorbance measurements using Beer-Lambert law. This method is standard in plant-based foods where pigment content reflects quality or ripeness.
Option b: Moisture content of food. Moisture or water content is not directly determined by UV-VIS spectroscopy. Moisture is usually measured by methods like oven-drying, moisture analyzers, or near-infrared spectroscopy (NIR) that target overtone/overtone bands of water, not the UV-Vis range. Therefore this choice is inaccurate for UV-VIS.
Option c: Total fat content in food. Fat content is generally quantified using gravimetric methods (e.g., Soxhlet extraction) or certain instrumental techniques (e.g., NMR, FTIR) that detect lipid-related signals, not UV-Vis absorption in the typical sense. Thus, UV-VIS is not the standard approach for total fat content.
Option d: Water activity. Water activity (aW) measures the availability of free water and is determined by specialized environmental or chemical sensors or chilled mirror devices, not by UV-Vis absorption. Hence this option does not align with what UV-VIS measures.
In summary, UV-VIS spectroscopy is well-suited for assessing pigments such as chlorophyll due to their distinctive absorption in the visible spectrum, while moisture, fat, and water activity are assessed by other methods that rely on different physical principles or spectral regions.

UV-VIS spectroscopy is commonly used to measure ______[Fill in the blank]Single choice

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