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Progress with the implementation of a diode array near-infrared spectrometer for direct at-line analysis of sugarcane samples.

The feasibility of routine cane testing using Near-Infrared Spectroscopy (NIRS) to replace conventional juice-extraction procedures in the SASEX laboratories was investigated with a Perten DA7000 direct-light, single diode array spectrometer. Validation results were very satisfactory for DM, BRIX and POL (R=0.98, 0.93, and 0.94; SEP= 0.676, 0.768, 1.052 %, respectively) and somewhat lower for fibre and purity (R=0.89, 0.83; SEP=0.912, 9.035 %). A method was tested for detecting outlier samples during measurement, where predicted moisture+fibre+BRIX which deviates from 100% by more than two standard errors (0.75%) is rejected. Further improvements in temperature control and more regional representation of calibration samples are needed to optimise the performance of this equipment for routine cane testing. Considerable savings in time, labour, chemicals, and hazardous waste disposal can be attained by this rapid NIRS method on shredded cane when compared to conventional juice processing methods.