Determination of Chemical Characterization in Rice Husk (Oryza saliva) treated with Sodium Hydroxide

Rice husk (Oryza saliva) is a cheap agro-based waste materials. This biomass materials have a lot of potential to be converted into more useful products such as silica. Rice husk was treated by Sodium Hydroxide as a leaching agent and undergo solvent extraction method. Several characterizations has been done to analyse the chemical properties of rice husk after extraction by Sodium Hydroxide including FTIR, XRF, PSA and SEM-EDS. SEM shows a linear ridged conformation with bright dome-like structures, due to more concentrated distribution of silica. EDS shows 31.97% wt. of silica. The average size of silica particle can be observed by PSA which is 240.4 nm. FTIR shows —OH bond in broad band range 3360-3320.7 cm-1 and it was increased due to the increasing of Si content (31.97%) after being treated with NaOH. HPLC results show some peak at different retention time. HPLC with MS (mass spectrometer) should be used in order to identify the organic compound in the rice husk. However, from the HPLC results, it show two highest intensities peak at 3.477 and 8.333 retention time which is for lutein and cycloartenol ferulate respectively. Lutein is called as a carotenoid vitamin. It is related to the β-ceratone and vitamin A. While cycloartenol ferulate is called as an inhibitor to skin tumour.