Iswendi Iswendi


This research aimed to determine the optimum amylase activity at the variations of temperature and pH, and the effectiveness of extractors.  The extraction of the enzyme can be done in two ways, with an organic solvent and inorganic salt. We have conducted research on amylase activity of yam tubers extracted with ethanol and ammonium sulfate. This research is an experimental research using complete randomized design with two factorials which are pH and temperature. pH variations were 4, 4.5, 5.0, 5.5, and 6, while the variation of temperature are 30C, 400 C, 500C, and 600C. Isolation of amylase-was carried out by multilevel fractionation using saturated ammonium sulphate 40, 60. 80, and 90% w/v and cold ethanol 95%. Amylase activity was determined based on the concentration of glucose which is result of hydrolysis of starch by Nelson-Somogy method. The highest activity was found in fraction I, pH 4 and temperature of 500C with 34.55 units of activity for ethanol solvent and 30.72 units for ammonium sulfate.


Key words: amylase, activity, isolation, yam tubers extracted


Alexander RR, Griffiths JM. 1991. Basic Biochemical Methods. Wiley-Liss Publication: New York.

Amrina M. 2004. Ekstraksi dan Penentuan Aktivitas Enzim Ami-lase dari Umbi Bengkuang (Pachyrrihizus arosus L.Urb) Hasil Ekstraksi Dengan Etanol dan Amonium Sulfat. Skripsi. Jurusan Kimia FMIPA UNP.

Forsyth JL et al. 2002. Characterization of Starch from Tubes of Yam Bean (Pachyrrizus ahipa). Journal of Agrycultur and Food Chemistry. Vol. 50. No. 2.

Hagenimana V et al. 1992. Distribution of Amylases within Sweet Ptato (Ipomoea sbatatas) Root Tussue. Journal Agricultaral Food Chemistry. Vol 40.

Kadziola A, Haser R. 1994. Criystal and Moleculer Structure of Barley -amylase . Journal Mol. Biol, Vol 239: 104-122.

Mardiah E. 1996. Studi Pendahuluan Isolasi dan Penentuan Aktivitas Enzim Amilase dari Talas (Cococasta esculenta). Laporan Penelitian. Depdikbud Lembaga Penelitian Universitas Andalas Padang.

Plummer DT. 1978. Introduction to Practical Biochemistry. 2th edition. Mc. Graw Hill Book Company (UK) Limitited. London.

Sadikin M. 2002. Biokimia Enzim. Widya Medika. Jakarta.

Suhartono MT. 1989. Enzim dan Bioteknologi. Depdikbud Dirjen Dikti. IPB, Bogor.

Winarno FG. 1986. Enzim Pangan. PT. Gramedia Pustaka Utama. Jakarta.



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Sainstek: Jurnal Sains dan Teknologi
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