PENINGKATAN AKTIVITAS LIPASE KAPANG LIMBAH KERNEL DAN NUT KELAPA SAWIT DENGAN RADIASI GAMA DAN ULTRAVIOLET
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Abstract
Kapang dari limbah kelapa sawit diisolasi dari Malingping, Lebak, Banten, Jawa Barat berpotensi untuk menghasilkan lipase. Penelitian ini betujuan meningkatkan aktivitas lipase kapang dengan radiasi sinar gama dan sinar ultraviolet (UV). Spora kapang NA dan KC dipaparkan pada berbagai radiasi gama dosis 1, 2, 3 dan 4 kGy. Hasil terbaik dari mutan NA dan KC dilanjutkan dengan mutasi ultraviolet dengan lama inkubasi 1, 2, 3, dan 4 jam, dosis 0,1 J/cm2, 254 nm, 20 cm. Aktivitas lipase diuji dengan metode Lindfield. Hasil penelitian menunjukkan bahwa radiasi gama berpengaruh pada aktivitas lipase mutan NA 1kGy 8,58 U/mL dan KC1 kGy 8,25 U/mL, masing-masing menaikkan aktivitas lipase sebesar 4,6% dan 3,13% dari wild type-nya. Hasil mutasi dengan ultraviolet berpengaruh pada aktivitas lipase mutan KC4H 10U/mL dan NA3H 9,25 U/mL, masing-masing menaikkan aktivitas lipase sebesar 25% dan 15,63% dari wild type-nya. Berdasarkan pendekatan fenotipik dan filogenetik (28s rRNA), isolat kapang kernel C memiliki similiaritas 100% dengan spesies Aspergillus fumigatus strain RA204.
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