R.D. report no 114 Hygroscopic water in sugarcane
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Hygroscopic water in sugar cane may be characterised as water strongly sorbed onto the cane fibre and being unavailable for the solution of the soluble components present in sugar cane. As a result, analytical methods utilising the wet disintegrator technique, produce higher pol and Brix results, than would be observed if all water present in cane fibre were available for solution of soluble substances. Employing a method whereby dry, processed, essentially sucrose free cane fibre is contacted with a known quantity of sucrose solution for the measurement of hygroscopic water, this report aimed to improve on previous attempts in providing a repeatable, reproducible method for the determination of hygroscopic water in cane fibre, to investigate the effect of experimental variations, and to validate the currently used value of 25% on fibre. In addition, absolute measurements of cane conscituents via Soxhlet extraction under vacuum, controlled to maintain specified extraction conditions, were made in order to evaluate the effectiveness of this extraction technique in comparison to the currently used wet disintegrator technique. Results indicated that the mean value of % hygroscopic water for several cane ranged between 17 and 22%, falling short of the currently used value of 25%, presenting a new value that may be incorporated in wet disintegrator results. Soxhlet extraction results indicated that the possibility exists for using an extraction technique for Brix determinations in cane, however the quantity of cane used for the analysis would need to be increased in order to be representative of the gross sample. Overall, Soxhlet extraction results tended to be 0.5 to 1.0 % Brix on cane lower in comparison to pilot wet disintegrator results.
Please use this to cite or link to this itemhttp://hdl.handle.net/11079/12664
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