Judul: Penentuan Suhu dan Waktu pada Ekstraksi Wet Rendering Minyak Ikan dari By-Product Ikan Nila (Oreochromis niloticus)
Abstrak: Tilapia is a farmed commodity of freshwater fish that can be processed into refined products, one example is the tilapia fillets. The arising problem from the utilization of tilapia into many processed products is residual waste processed. The purpose of this research is to obtain fish oil from by-product with wet rendering extraction; to characterize fish oil from wet rendering extraction; to determine the best temperature and time wet rendering extraction; to determine the fatty acid profile of fish oil that be extracted with wet rendering method. Extraction temperatures and times that be used were 25, 50, 70, 90°C, and 15, 25, 35, and 45 min. Quality of extracted was tested with Free Fatty Acid Test, acid value, peroxide, p-anisidine, total oxidation, and fatty acid profiles. The best temperature and time of wet rendering extraction is 70°C for 35 minutes, with the highest value of fish oil yield is 6,44%. Fish oil yield that be obtained from Bligh and Dyer extraction amounted to 8,12%. The value of EPA and DHA that be contained of fish oil extracted wet rendering is 1,15% and 1,03%.
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Judul: Pengaruh Konsentrasi Adsorben dan Waktu Bleaching pada Pemurnian Minyak Ikan Nila (Oreochromis sp.)
Abstrak: Tilapia fish oil (Oreochromis sp.) which is produced by the home industry from fish fillet waste is still in the form of crude oil which has low quality so it needs to be purified. Fish oil extraction was carried out using the wet rendering method, then proceeded to the purification stage using neutralization and bleaching. The purpose of this study was to determine the best concentration of magnesol XL adsorbent and the length of time for adsorption in the bleaching process for refining tilapia oil (Oreochromis sp.) to produce fish oil according to the International Fish Oil Standard (IFOS). The oxidation parameters of tilapia crude oil were not in accordance with IFOS with free fatty acids 5.52%, acid number 10.62 mg KOH/g, peroxide number 17.31 mEq/kg, anisidin number 11.23 mEq/kg, and total oxidation 45.86 mEq/kg. The oxidation parameters of pure tilapia fish oil in the best treatment, namely the addition of 3% adsorbent and a bleaching time of 15 minutes had a free fatty acid value of 1.31%, an acid number of 2.6 mg KOH/g, a peroxide value of 4.3 mEq/kg, an acid number of 4.3 mEq/kg anisidin 7.63 mEq/kg, and total oxidation 16.23 mEq/kg., Minyak ikan nila (Oreochromis sp.) yang diproduksi oleh industri rumah tangga dari limbah fillet ikan masih berupa minyak kasar yang memiliki kualitas rendah sehingga perlu dilakukan pemurnian. Ekstraksi minyak ikan dilakukan menggunakan metode wet rendering, kemudian dilanjutkan ke tahap pemurnian menggunakan netralisasi dan bleaching. Tujuan penelitian ini adalah menentukan konsentrasi terbaik adsorben magnesol XL dan lama waktu adsorpsi pada proses bleaching pemurnian minyak ikan nila (Oreochromis sp.) hingga menghasilkan minyak ikan yang sesuai standar International Fish Oil Standard (IFOS). Parameter oksidasi minyak kasar ikan nila belum sesuai IFOS dengan asam lemak bebas 5.52%, bilangan asam 10.62 mg KOH/g, bilangan peroksida 17.31 mEq/kg, bilangan anisidin 11.23 mEq/kg, dan total oksidasi 45.86 mEq/kg. Parameter oksidasi minyak ikan nila murni pada perlakuan terbaik yaitu penambahan adsorben 3% dan waktu bleaching selama 15 menit memiliki nilai asam lemak bebas 1.31%, bilangan asam 2.6 mg KOH/g, bilangan peroksida 4.3 mEq/kg, bilangan anisidin 7.63 mEq/kg, dan total oksidasi 16.23 mEq/kg.
Keyword: adsorbent, IFOS, fish oil, purification

Judul: Penyelesaian Masalah Pelabelan Graf vertex Magic pada Graf Cycle Sederhana
Abstrak: Graf vertex magic adalah suatu graf memiliki nilai bilangan magic yang sama pada masing-masing vertex yang berbeda. Graf cycle sederhana adalah suatu walk tertutup yang mengandung setidaknya tiga vertex, semua vertex-nya berbeda dan setiap vertex terhubungkan oleh satu edge.
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