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IJSTR >> Volume 7 - Issue 12, December 2018 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Mathematical Model To Determine Rice Milling Degree Based On Absorbance Characteristic Of Rice Solution At UV Spectrum

[Full Text]



Mardison, Sutrisno, Usman Ahmad dan Slamet Widodo



mathematical model, milling degree, rice, UV absorbance



Degree of Milling (DM) is an important parameter in determining the quality of milled rice, especially for the graded and labeled rice to put in the market. The development of method to determine the DM quantitatively is very important for checking the quality of rice quickly and accurately before packaging and labeling. This study aims to develop a mathematical model to determine the DM of milled rice based on the absorption characteristics of electromagnetic waves in the UV spectrum by rice solution. The method used in the model development was the empirical approach of the absorbance characteristics of electromagnetic waves in the UV spectrum, resulted from the Ciherang rice in n-Hexane solution. Pre-processing of spectral data by applying smoothing, the first derivative, second derivative and normalization were conducted in the development of mathematical model. It is known that the characteristic of electromagnetic wave absorption in UV spectrum of the rice solution was dominated by 331 nm wavelength. Furthermore, the mathematical model for predicting DM value was developed through the calibration stage and model validation using absorbance data at that wavelength. The calibration stage used the gravimetry method and put as reference to develop the exponential mathematical model with determination coefficient (R2) of 0.9595, while the determination coefficient for model validation is 0.9504 with Root Mean Square Error of Prediction (RMSEP) of 0.6193.



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