As one of vegetable plants in South Sulawesi, cabbage (Brassica oleracea L.) crops has generated cellulose fibers biomass which is potentially modified into nano-crystalline cellulose, a valuable material in the pharmaceutical formula. Therefore, this study aims to manipulate the natural cellulose fibers of cabbage biomass through acid hydrolysis method within product preliminary evaluation through FT-IR and XRD. The fibers were modified through the bleaching process produce micro crystalline cellulose, which was then hydrolyzed with 65% sulfuric acid to obtain nanocrystalline cellulose. The products have yellow pale to brown colour, with a yield of 10.06% and 31.16% respectively. Based on FT-IR spectra, both products inherit cellulose characteristics, C-O (1232.16 cm-1); C = O (1743.65 cm-1); -OH (1625.99 cm-1); C-H (2920.23 cm-1); O-H (3414 cm-1). The increasing trend of crystallinity index during the process was also observed in XRD diffractogram. It is identifiable from 7.41% for natural fiber, 69.68% for crystalline microcrystalline, and 78.01% for nano crystalline cellulose. Through Match®, the estimated crystalline product size reaches 58.91 nm.
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