Kayu cempaka (Elmerrillia ovalis) adalah salah satu jenis tanaman kayu yang dipakai dalam pembuatan rumah adat/rumah panggung dan paling banyak dijumpai di Sulawesi Utara. Industri pembuatan rumah ini menghasilkan limbah kayu dari proses pengergajian. Kayu memiliki komponen kimia utama yaitu selulosa, hemi-selulosa dan lignin yang mana dua komponen pertama dapat dikonversi menjadi gula dan etanol. Modifikasi struktur lignoselulosa yaitu dengan melakukan perlakuan/pretreatment lewat pemanasan dari gelombang mikro (microwave) supaya pemanasan bahan merata/homogen. Keberhasilan modifikasi struktur selulosa dapat dilihat berdasarkan hasil karakterisasi X-RD memperlihatkan bahwa terjadi penurunan kristalinitas ketika dilakukan pretreatment dengan iradiasi gelombang mikro, untuk analisis SEM mengalami perubahan morfologi permukaan struktur, dan untuk analisis gugus fungsi lewat analisis FT-IR yang menunjukkan adanya gerak vibrasi.Wood ofcempaka (Elmerrillia ovalis) is one of woody plants used in making traditional house/stage house and most often found in North Sulawesi. Home-making industry produced wood waste from sawing process. Wood has main chemical components i.e. cellulose, hemi-cellulose and lignin which the first two components can be converted into sugar and ethanol. Modification of lignocellulosic structure was by the microwave pretreatment for homogeneous heating. The successful modifications of cellulose ware analysed by X-RD showed decreasing of crystallinity; by SEM showed surface morphological changing, and by FT-IR showed vibration motion.
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