| dc.description.abstract | Sago waste fibers is wasted by sago starch industry and contain 42% cellulose. The cellulose was isolated to obtain the best isolate through various processes and treatments, including preparation with and without grinding, pulping in NaOH with and without heating in HCl, as well as delignification. Grinding and heating in HCl treatment were found to increase the alpha cellulose content. Heating treatment in HCl with and without grinding produced 79.96% and 74.70%, of alpha cellulose, respectively, higher than without heating in HCl that was 72.98% and 63.20%, respectively. Fourier transform infrared spectra of the isolates were not significantly different from a commercial cellulose showing characteristic by β-glycoside absorption at 894 cm-1. Heating in HCl with and without grinding also increased the crystallinity index by removing part of the amorphous region. The differential thermogram showed that the isolates started to lose the mass at around 98–102 °C and lost the maximum weight lost at around 352–377 oC. | en |
