FOOD & DRINK TECHNOLOGY 37
was used to determine fat, protein and moisture in various meat and dairy products. Te system was supplied pre-calibrated and replicate analysis was performed on a range of homogenised meat and dairy product samples. Results were obtained in minutes and compared to results produced by different reference methods - fat by solvent extraction, moisture by oven drying, and total protein by Kjeldahl nitrogen determination.
Results from the analyser generally showed good correlation with the results obtained using reference methods - though a couple of samples (frankfurters and breaded ham) did show that further calibration would be necessary to produce reliable results for protein. Interestingly, the method was fairly robust and there was no need to calibrate the instrument prior to making measurements in different sample types.
A second study used a reflectance based instrument which used a range of specific filters for scanning at different wavelengths. In this, the analyser was used to determine fat, protein and moisture in beef and pork mince samples. Although the instrument was pre-calibrated for measurement of parameters, the manufacturer recommended further calibration on a range of high, intermediate and low fat samples to improve the accuracy of measurement for the sample type. Again, results were compared to those obtained using the reference methods.
Results obtained for fat analysis on both mince types showed good correlation (>96 per cent) with those obtained by reference methods. Te moisture results were more variable, with >90 per cent correlation with beef, but only 63 per cent with pork. Te protein results gave a correlation of 86 per cent with pork mince and 72 per cent with beef mince. It was concluded that further work and calibration on samples covering a much wider range of fat, moisture and protein levels would be
required to improve the accuracy of measurement using this instrument.
Testing worth its salt? Te sodium content of food is often declared on product packaging and therefore quick and accurate methods for its determination will
benefit the industry. An instrument was evaluated which used thermometric titration to determine sodium levels in various food products. Results were compared to results produced by atomic absorption spectrophotometry (AAS).
Te majority of the initial results obtained by thermometric titration showed reasonable correlation with the results obtained using AAS. Further evaluation of the approach on different food types and a higher number of replicates would be required to validate the technique so
Measuring heads for reflection measurement
The OMK ECLIPSE is the latest generation probe for the measurement of diffuse reflection. Employing the optical 45°/0° geometry – standardised for colour measurements – the probe offers precise and accurate results from 380 to 2150 nm. A novel, patented double beam
design facilitating permanent synchronous internal referencing, guarantees reliable and reproducible results unaffected by movement, rotation, vibration or temperature changes. The measuring principle ensures
carefree, long-term operation in various production environments such as blenders, pipes or conveyor systems. Easy installation even in narrow confines and adjustment-free lamp replacement are some of the benefits of the sophisticated concept of the OMK ECLIPSE. The OMK ECLIPSE is a accessory for the MCS 600 and CORONA PLUS Remote systems. The CORONA PLUS Remote is
optimal for the measurement of the ingredients and colour of bulk materials in pipes or chain conveyers. The compact, light and robust spectrometer
can be installed in each production line very easily. The new optical design enables
very short measurement times and provides constant monitoring, for example, of the flour milling process and provides real time results to the control system so that adjustments to the process can be made immediately.
Enter 37 or ✔ at
www.scientistlive.com/eurolab
Carl Zeiss MicroImaging GmbH is based in Jena, Germany.
www.zeiss.de/spectral
www.scientistlive.com
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