Electronic Theses and Dissertation

Pengaruh Berbagai Sumber Nitrogen terhadap Pertumbuhan Mikroalga yang Diisolasi dari Hutan Bakau di Banda Aceh
Effect of Nitrogen Sources to the Growth of Microalgae Isolated from Mangroves Forest in Banda Aceh
Syauqi Harzaki1, Sri Haryani2, M. Ikhsan Sulaiman2
1Student of Department of Agricultural Product Technology, Faculty of Agriculture, Syiah Kuala University – Banda Aceh
2The staff of Department of Agricultural Product Technology, Faculty of Agriculture, Syiah Kuala University – Banda Aceh

ABSTRAK
Asam lemak omega-3 merupakan asam lemak tak jenuh yang sangat penting bagi tubuh untuk pembentukan membran sel, terutama sel otak dan sistem saraf. Omega-3 biasanya didapatkan dalam bentuk minyak ikan. Namun, konsumsi ikan sebagai sumber protein dan sebagai sumber omega-3 bersaing sehingga dapat mengganggu stabilitas pasar. Mikroalga adalah sumber hasil laut yang mengandung omega-3 yang pertumbuhannya dipengaruhi berbagai hal seperti kondisi kultur, suhu, dan salinitas. Penelitian ini bertujuan untuk mengetahui pengaruh berbagai sumber nitrogen terhadap pertumbuhan mikroalga yang diisolasi dati hutan bakau di Banda Aceh. Penelitian menggunakan Rancangan Acak Lengkap 1 (satu) faktor (sumber nitrogen) dengan tiga taraf, yaitu yeast, NaNO3, dan MSG. Hasil penelitian menunjukkan bahwa sumber nitrogen berpengaruh nyata terhadap biomassa kering. Sumber nitrogen dari yeast menghasilkan 4.22 g/L biomassa kering dan MSG 4.41 g/L yang lebih tinggi dibandingkan dengan jumlah biomassa kering NaNO3 (2.58 g/L) pada hari ke-9. Sumber nitrogen juga berpengaruh nyata terhadap densitas optis kultur. Densitas optis kultur sumber nitrogen yeast adalah 1,20 yang merupakan densitas optis tertinggi bila dibandingkan dengan sumber nitrogen MSG dan sodium nitrat (1,18 dan 0,82).
Kata Kunci: Mikroalga, Sumber nitrogen, Biomassa, Densitas optis.

ABSTRACT
Omega-3 fatty acid is an unsaturated fatty acid that is essential for the body for the formation of cell membranes, especially the brain and nervous system. Usually, omega-3 is obtained in the form of fish oil. However, consumption of fish as a source of protein and as a source of omega-3 compete so as to destabilize the market. Microalgae are a source of seafood containing omega-3 that growth is influenced by many factors such as culture conditions, temperature, and salinity. This study aims to determine the effect of various nitrogen sources on the growth of microalgae isolated from mangrove forests in Banda Aceh. This research used completely randomized design 1 (one) factor (nitrogen sources) with three levels, namely yeast, NaNO3, and MSG. The results showed that the nitrogen source significantly affected the dry biomass. Nitrogen sources of yeast yield of 4,22 g/L dry biomass and MSG 4,41 g/L higher than the amount of dry biomass NaNo3 (2,58 g / L) on day 9. Sources of nitrogen also significantly affect the optical density of the culture. The optical density of the culture yeast as nitrogen source is 1,20 which is the highest optical density when compared to other nitrogen sources MSG and sodium nitrate (1,18 and 0,82).
Keywords: Microalgae, Nitrogen sources, Biomass, Optical density.

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