Posts Tagged ‘pol tebu’

EFFECTS OF ANALYSIS METHOD IN PREDICTION CANE QUALITY USING NIR SPECTROSCOPY

ABSTRACT

NIR spectroscopy is a secondary method that can be used to predict the quality of a raw material. Analysis of sugar cane quality takes 2 hours; the use of NIR is expected to shorten the analysis time. In this study, NIR is used to predict three parameters of cane quality (pol%cane, brix% cane and fibre%cane) with two different analytical methods. The material for research was a 10 month Bululawang (BL) variety. Sugarcane was shredded using a JEFFCO cutter grinder, and then the samples of shredded cane are separated for conventional analysis and NIR. Conventional analysis using wet disintegrator and hydraulic press method. The same cane samples were measured at wavelength 700 – 2500 nm using NIR FOSS XDS RCA. Pretreatment of NIRS absorbance using Mahalanobis distance. The calibration model uses the partial least square (PLS) regression method. The NIR results were evaluated from high correlation coefficient (r2), low standard calibration (SEC) and high ratio of prediction to deviation (RPD). The experimental results show that the wet disintegrator method produces a better NIR calibration model than the hydraulic press method. The NIR evaluation of wet disintegrator method for pol%cane, r2 = 0,937, SEC = 0,459, SECV = 0,127, SEP = 0,516 and RPD = 3,119. Brix %cane, r2 = 0,905, SEC = 0,481, SECV = 0,117, SEP = 0,670  and RPD = 2,080. Fibre%cane, r2 =  0,783, SEC = 0,999 , SECV = 2,466, SEP = 1,396 and RPD = 1,267. NIR calibration for  pol%cane and brix%cane shows a good result, while the fibre%cane need to be improved. From the results of these experiments can be used as a basis for the development of NIR calibration models to analyze different cane varieties.

Keywords— NIR Spectroscopy, cane quality, NIR prediction, pol%cane     

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