How do Food Composition Analysis work?
Composition analysis instruments rely on physical or chemical properties that change with the concentration of the component of interest. Near-infrared and mid-infrared analysers measure absorbance by O–H, C–H and N–H bonds and convert spectra into concentrations with multivariate calibration models. Bomb calorimeters determine gross energy from the heat released during complete combustion in oxygen. Refractometers measure the refractive index, which rises with dissolved solids such as sugars. Enzymatic analysers use specific enzyme reactions coupled to NADH or colorimetric readouts. Salt analysers use potentiometric or conductivity sensing to measure sodium chloride. All secondary methods must be correlated with reference chemistry for each matrix.
Which Food Composition Analysis variants are available?
- Near-Infrared Food Composition Analyzer — A near-infrared food composition analyser measures moisture, fat, protein and carbohydrate in grains, powders and liquids by reflectance or transmission spectroscopy.
- Fourier-Transform Mid-Infrared Milk Analyzer — An FT-MIR milk analyser measures fat, protein, lactose, total solids and urea in milk and dairy products from mid-infrared absorption.
- Bomb Calorimeter for Food Energy Determination — A bomb calorimeter measures the gross energy content of food and feed by combusting a pelleted sample in oxygen and recording the temperature rise of the surrounding water.
- Digital Refractometer for Brix and Sugar Measurement — A digital refractometer measures Brix, refractive index and often sugar concentration in beverages, syrups and preserves from the refraction of light in a small sample.
- Automated Enzymatic Food Analyzer — An automated enzymatic food analyser quantifies sugars, organic acids, starch, ethanol and other specific analytes using enzyme reactions that are read photometrically.
- Salt Content Analyzer for Food — A salt content analyser measures sodium chloride in food and feed by potentiometric titration or conductivity, giving the salt figure used for nutrition labelling, taste control and compliance with regulatory sodium targets.
How do I choose the right variant?
Choose the technique from the parameter and the accuracy you must report. Near-infrared analysers give the fastest multi-parameter results for grains, powders and liquids, but they depend entirely on the calibration set, so they suit high sample numbers and stable matrices. Mid-infrared milk analysers are the accepted tool for dairy payment and standardisation at several hundred samples per hour. Bomb calorimetry is the only direct energy measurement and remains the reference for feed and labelling energy. Refractometry is simple and robust for sugar, juice and syrup control. Enzymatic analysers provide specificity for sugars, organic acids and starch where rapid kits are not accurate enough. Consider consumable use, calibration transfer and service response when comparing platforms.
Where are Food Composition Analysis used?
Food Composition Analysis are specified in nutrition labelling and specification verification, raw-material acceptance in grain, dairy and feed plants, in-process control of blending and drying, dairy payment and product standardisation, feed energy and nutrient evaluation and product development and recipe benchmarking.
Which standards and certifications apply?
Work with Food Composition Analysis is commonly governed by AOAC Official Methods of Analysis, ISO 12099, ISO 6658, ISO 6496, ISO 2171, ISO 8968 and ISO/IEC 17025. Instrument certifications such as CE marking are confirmed per configuration and never assumed.
What are the key considerations before purchase?
Infrared analysers need a representative calibration set covering the full range of moisture, fat and protein found in routine samples, and the model must be re-validated after major raw-material changes. Temperature and sample presentation strongly affect spectra, so cups and grinder settings should be controlled. Bomb calorimeters require oxygen of high purity, careful pellet preparation and regular benzoic acid checks. Enzymatic and refractometric methods need clean optics, fresh reagents and control samples. Keep records of reference-method comparisons, and confirm that calibrations, service and spare parts remain available for the life of the instrument.
