Determination of Catechin Content in Gambir Powder from Dried Gambir Leaves Quickly using FT NIR PLS Model

Andasuryani Andasuryani, Y.A. Purwanto, I W Budiastra, K. Syamsu


Conventional production process of gambir often produces gambir with low content of catechin. Engineering of production processes of gambir leaves to produce gambir powder has been developed by previous researchers. The objective of this study was to develop a calibration model to predict the content of catechin in gambir powder from dried gambir leaves quickly using FT-NIR PLS model.  Reflectance spectra of gambir powder from dried gambir leaves obtained at a wavelength of 1000 to 2500 nm. Spectra pre-processing treatment method used was a combination between normalization between 0 and 1 (n01) method and first derivative Savitzky-Golay 9 points (dg1). The result showed that correlation coefficient and standard error of prediction (SEP) were 0.99 and 2.10 % respectively, obtained when used 6 factors of partial least square (PLS). Calibration model developed has shown higher accuracy and precision to predict catechin content of gambir powder from dried gambir leaves.


gambir, catechin, FT-NIR spectroscopy, PLS

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Published by INSIGHT - Indonesian Society for Knowledge and Human Development